all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 3281a07b8d88f7e41747b27668e2e25a968199de 100560 bytes (raw)
name: src/sysdep.c 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
 
/* Interfaces to system-dependent kernel and library entries.
   Copyright (C) 1985-1988, 1993-1995, 1999-2015 Free Software
   Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>

/* If HYBRID_GET_CURRENT_DIR_NAME is defined in conf_post.h, then we
   need the following before including unistd.h, in order to pick up
   the right prototype for gget_current_dir_name.  */
#ifdef HYBRID_GET_CURRENT_DIR_NAME
#undef get_current_dir_name
#define get_current_dir_name gget_current_dir_name
#endif

#include <execinfo.h>
#include "sysstdio.h"
#ifdef HAVE_PWD_H
#include <pwd.h>
#include <grp.h>
#endif /* HAVE_PWD_H */
#include <limits.h>
#include <unistd.h>

#include <c-ctype.h>
#include <utimens.h>

#include "lisp.h"
#include "sysselect.h"
#include "blockinput.h"

#if defined DARWIN_OS || defined __FreeBSD__
# include <sys/sysctl.h>
#endif

#ifdef __FreeBSD__
/* Sparc/ARM machine/frame.h has 'struct frame' which conflicts with Emacs's
   'struct frame', so rename it.  */
# define frame freebsd_frame
# include <sys/user.h>
# undef frame

# include <math.h>
#endif

#ifdef WINDOWSNT
#define read sys_read
#define write sys_write
#ifndef STDERR_FILENO
#define STDERR_FILENO fileno(GetStdHandle(STD_ERROR_HANDLE))
#endif
#include <windows.h>
#endif /* not WINDOWSNT */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

/* Get SI_SRPC_DOMAIN, if it is available.  */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif

#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
#include "msdos.h"
#endif

#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#include <sys/param.h>
#include <sys/file.h>
#include <fcntl.h>

#include "systty.h"
#include "syswait.h"

#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#include <memory.h>
#endif /* HAVE_SYS_UTSNAME_H */

#include "keyboard.h"
#include "frame.h"
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"
#include "cm.h"  /* for reset_sys_modes */

#ifdef WINDOWSNT
#include <direct.h>
/* In process.h which conflicts with the local copy.  */
#define _P_WAIT 0
int _cdecl _spawnlp (int, const char *, const char *, ...);
int _cdecl _getpid (void);
/* The following is needed for O_CLOEXEC, F_SETFD, FD_CLOEXEC, and
   several prototypes of functions called below.  */
#include <sys/socket.h>
#endif

#include "syssignal.h"
#include "systime.h"

/* ULLONG_MAX is missing on Red Hat Linux 7.3; see Bug#11781.  */
#ifndef ULLONG_MAX
#define ULLONG_MAX TYPE_MAXIMUM (unsigned long long int)
#endif

/* Declare here, including term.h is problematic on some systems.  */
extern void tputs (const char *, int, int (*)(int));

static const int baud_convert[] =
  {
    0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
    1800, 2400, 4800, 9600, 19200, 38400
  };

#if !defined HAVE_GET_CURRENT_DIR_NAME || defined BROKEN_GET_CURRENT_DIR_NAME \
  || (defined HYBRID_GET_CURRENT_DIR_NAME)
/* Return the current working directory.  Returns NULL on errors.
   Any other returned value must be freed with free. This is used
   only when get_current_dir_name is not defined on the system.  */
char *
get_current_dir_name (void)
{
  char *buf;
  char *pwd = getenv ("PWD");
  struct stat dotstat, pwdstat;
  /* If PWD is accurate, use it instead of calling getcwd.  PWD is
     sometimes a nicer name, and using it may avoid a fatal error if a
     parent directory is searchable but not readable.  */
  if (pwd
      && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
      && stat (pwd, &pwdstat) == 0
      && stat (".", &dotstat) == 0
      && dotstat.st_ino == pwdstat.st_ino
      && dotstat.st_dev == pwdstat.st_dev
#ifdef MAXPATHLEN
      && strlen (pwd) < MAXPATHLEN
#endif
      )
    {
      buf = malloc (strlen (pwd) + 1);
      if (!buf)
        return NULL;
      strcpy (buf, pwd);
    }
  else
    {
      size_t buf_size = 1024;
      buf = malloc (buf_size);
      if (!buf)
        return NULL;
      for (;;)
        {
          if (getcwd (buf, buf_size) == buf)
            break;
          if (errno != ERANGE)
            {
              int tmp_errno = errno;
              free (buf);
              errno = tmp_errno;
              return NULL;
            }
          buf_size *= 2;
          buf = realloc (buf, buf_size);
          if (!buf)
            return NULL;
        }
    }
  return buf;
}
#endif

\f
/* Discard pending input on all input descriptors.  */

void
discard_tty_input (void)
{
#ifndef WINDOWSNT
  struct emacs_tty buf;

  if (noninteractive)
    return;

#ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
  while (dos_keyread () != -1)
    ;
#else /* not MSDOS */
  {
    struct tty_display_info *tty;
    for (tty = tty_list; tty; tty = tty->next)
      {
        if (tty->input)         /* Is the device suspended? */
          {
            emacs_get_tty (fileno (tty->input), &buf);
            emacs_set_tty (fileno (tty->input), &buf, 0);
          }
      }
  }
#endif /* not MSDOS */
#endif /* not WINDOWSNT */
}

\f
#ifdef SIGTSTP

/* Arrange for character C to be read as the next input from
   the terminal.
   XXX What if we have multiple ttys?
*/

void
stuff_char (char c)
{
  if (! (FRAMEP (selected_frame)
	 && FRAME_LIVE_P (XFRAME (selected_frame))
	 && FRAME_TERMCAP_P (XFRAME (selected_frame))))
    return;

/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
  ioctl (fileno (CURTTY()->input), TIOCSTI, &c);
#else /* no TIOCSTI */
  error ("Cannot stuff terminal input characters in this version of Unix");
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
\f
void
init_baud_rate (int fd)
{
  int emacs_ospeed;

  if (noninteractive)
    emacs_ospeed = 0;
  else
    {
#ifdef DOS_NT
    emacs_ospeed = 15;
#else  /* not DOS_NT */
      struct termios sg;

      sg.c_cflag = B9600;
      tcgetattr (fd, &sg);
      emacs_ospeed = cfgetospeed (&sg);
#endif /* not DOS_NT */
    }

  baud_rate = (emacs_ospeed < ARRAYELTS (baud_convert)
	       ? baud_convert[emacs_ospeed] : 9600);
  if (baud_rate == 0)
    baud_rate = 1200;
}

\f

#ifndef MSDOS

/* Wait for the subprocess with process id CHILD to terminate or change status.
   CHILD must be a child process that has not been reaped.
   If STATUS is non-null, store the waitpid-style exit status into *STATUS
   and tell wait_reading_process_output that it needs to look around.
   Use waitpid-style OPTIONS when waiting.
   If INTERRUPTIBLE, this function is interruptible by a signal.

   Return CHILD if successful, 0 if no status is available;
   the latter is possible only when options & NOHANG.  */
static pid_t
get_child_status (pid_t child, int *status, int options, bool interruptible)
{
  pid_t pid;

  /* Invoke waitpid only with a known process ID; do not invoke
     waitpid with a nonpositive argument.  Otherwise, Emacs might
     reap an unwanted process by mistake.  For example, invoking
     waitpid (-1, ...) can mess up glib by reaping glib's subprocesses,
     so that another thread running glib won't find them.  */
  eassert (child > 0);

  while ((pid = waitpid (child, status, options)) < 0)
    {
      /* Check that CHILD is a child process that has not been reaped,
	 and that STATUS and OPTIONS are valid.  Otherwise abort,
	 as continuing after this internal error could cause Emacs to
	 become confused and kill innocent-victim processes.  */
      if (errno != EINTR)
	emacs_abort ();

      /* Note: the MS-Windows emulation of waitpid calls QUIT
	 internally.  */
      if (interruptible)
	QUIT;
    }

  /* If successful and status is requested, tell wait_reading_process_output
     that it needs to wake up and look around.  */
  if (pid && status && input_available_clear_time)
    *input_available_clear_time = make_timespec (0, 0);

  return pid;
}

/* Wait for the subprocess with process id CHILD to terminate.
   CHILD must be a child process that has not been reaped.
   If STATUS is non-null, store the waitpid-style exit status into *STATUS
   and tell wait_reading_process_output that it needs to look around.
   If INTERRUPTIBLE, this function is interruptible by a signal.  */
void
wait_for_termination (pid_t child, int *status, bool interruptible)
{
  get_child_status (child, status, 0, interruptible);
}

/* Report whether the subprocess with process id CHILD has changed status.
   Termination counts as a change of status.
   CHILD must be a child process that has not been reaped.
   If STATUS is non-null, store the waitpid-style exit status into *STATUS
   and tell wait_reading_process_output that it needs to look around.
   Use waitpid-style OPTIONS to check status, but do not wait.

   Return CHILD if successful, 0 if no status is available because
   the process's state has not changed.  */
pid_t
child_status_changed (pid_t child, int *status, int options)
{
  return get_child_status (child, status, WNOHANG | options, 0);
}

\f
/*  Set up the terminal at the other end of a pseudo-terminal that
    we will be controlling an inferior through.
    It should not echo or do line-editing, since that is done
    in Emacs.  No padding needed for insertion into an Emacs buffer.  */

void
child_setup_tty (int out)
{
#ifndef WINDOWSNT
  struct emacs_tty s;

  emacs_get_tty (out, &s);
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
#ifdef NLDLY
  /* http://lists.gnu.org/archive/html/emacs-devel/2008-05/msg00406.html
     Some versions of GNU Hurd do not have FFDLY?  */
#ifdef FFDLY
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
#else
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY);
  				/* No output delays */
#endif
#endif
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
#ifdef ISTRIP
  s.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
#ifdef OLCUC
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
  s.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
  s.main.c_cc[VERASE] = CDISABLE;	/* disable erase processing */
  s.main.c_cc[VKILL] = CDISABLE;	/* disable kill processing */

#ifdef HPUX
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
#endif /* HPUX */

#ifdef SIGNALS_VIA_CHARACTERS
  /* the QUIT and INTR character are used in process_send_signal
     so set them here to something useful.  */
  if (s.main.c_cc[VQUIT] == CDISABLE)
    s.main.c_cc[VQUIT] = '\\'&037;	/* Control-\ */
  if (s.main.c_cc[VINTR] == CDISABLE)
    s.main.c_cc[VINTR] = 'C'&037;	/* Control-C */
#endif /* not SIGNALS_VIA_CHARACTERS */

#ifdef AIX
  /* Also, PTY overloads NUL and BREAK.
     don't ignore break, but don't signal either, so it looks like NUL.  */
  s.main.c_iflag &= ~IGNBRK;
  s.main.c_iflag &= ~BRKINT;
  /* rms: Formerly it set s.main.c_cc[VINTR] to 0377 here
     unconditionally.  Then a SIGNALS_VIA_CHARACTERS conditional
     would force it to 0377.  That looks like duplicated code.  */
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
#endif /* AIX */

  /* We originally enabled ICANON (and set VEOF to 04), and then had
     process.c send additional EOF chars to flush the output when faced
     with long lines, but this leads to weird effects when the
     subprocess has disabled ICANON and ends up seeing those spurious
     extra EOFs.  So we don't send EOFs any more in
     process.c:send_process.  First we tried to disable ICANON by
     default, so if a subsprocess sets up ICANON, it's his problem (or
     the Elisp package that talks to it) to deal with lines that are
     too long.  But this disables some features, such as the ability
     to send EOF signals.  So we re-enabled ICANON but there is no
     more "send eof to flush" going on (which is wrong and unportable
     in itself).  The correct way to handle too much output is to
     buffer what could not be written and then write it again when
     select returns ok for writing.  This has it own set of
     problems.  Write is now asynchronous, is that a problem?  How much
     do we buffer, and what do we do when that limit is reached?  */

  s.main.c_lflag |= ICANON;	/* Enable line editing and eof processing */
  s.main.c_cc[VEOF] = 'D'&037;	/* Control-D */
#if 0	    /* These settings only apply to non-ICANON mode. */
  s.main.c_cc[VMIN] = 1;
  s.main.c_cc[VTIME] = 0;
#endif

  emacs_set_tty (out, &s, 0);
#endif /* not WINDOWSNT */
}
#endif	/* not MSDOS */

\f
/* Record a signal code and the action for it.  */
struct save_signal
{
  int code;
  struct sigaction action;
};

static void save_signal_handlers (struct save_signal *);
static void restore_signal_handlers (struct save_signal *);

/* Suspend the Emacs process; give terminal to its superior.  */

void
sys_suspend (void)
{
#ifndef DOS_NT
  kill (0, SIGTSTP);
#else
/* On a system where suspending is not implemented,
   instead fork a subshell and let it talk directly to the terminal
   while we wait.  */
  sys_subshell ();

#endif
}

/* Fork a subshell.  */

void
sys_subshell (void)
{
#ifdef DOS_NT	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
  int st;
#ifdef MSDOS
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#else
  char oldwd[MAX_UTF8_PATH];
#endif
#endif
  pid_t pid;
  int status;
  struct save_signal saved_handlers[5];
  char *str = SSDATA (encode_current_directory ());

#ifdef DOS_NT
  pid = 0;
#else
  {
    char *volatile str_volatile = str;
    pid = vfork ();
    str = str_volatile;
  }
#endif

  if (pid < 0)
    error ("Can't spawn subshell");

  saved_handlers[0].code = SIGINT;
  saved_handlers[1].code = SIGQUIT;
  saved_handlers[2].code = SIGTERM;
#ifdef USABLE_SIGIO
  saved_handlers[3].code = SIGIO;
  saved_handlers[4].code = 0;
#else
  saved_handlers[3].code = 0;
#endif

#ifdef DOS_NT
  save_signal_handlers (saved_handlers);
#endif

  if (pid == 0)
    {
      const char *sh = 0;

#ifdef DOS_NT    /* MW, Aug 1993 */
      getcwd (oldwd, sizeof oldwd);
      if (sh == 0)
	sh = egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
#endif
      if (sh == 0)
	sh = egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";

      /* Use our buffer's default directory for the subshell.  */
      if (chdir (str) != 0)
	{
#ifndef DOS_NT
	  emacs_perror (str);
	  _exit (EXIT_CANCELED);
#endif
	}

#ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
      {
	char *epwd = getenv ("PWD");
	char old_pwd[MAXPATHLEN+1+4];

	/* If PWD is set, pass it with corrected value.  */
	if (epwd)
	  {
	    strcpy (old_pwd, epwd);
	    setenv ("PWD", str, 1);
	  }
	st = system (sh);
	chdir (oldwd);	/* FIXME: Do the right thing on chdir failure.  */
	if (epwd)
	  putenv (old_pwd);	/* restore previous value */
      }
#else /* not MSDOS */
#ifdef  WINDOWSNT
      /* Waits for process completion */
      pid = _spawnlp (_P_WAIT, sh, sh, NULL);
      chdir (oldwd);	/* FIXME: Do the right thing on chdir failure.  */
      if (pid == -1)
	write (1, "Can't execute subshell", 22);
#else   /* not WINDOWSNT */
      execlp (sh, sh, (char *) 0);
      emacs_perror (sh);
      _exit (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
#endif  /* not WINDOWSNT */
#endif /* not MSDOS */
    }

  /* Do this now if we did not do it before.  */
#ifndef MSDOS
  save_signal_handlers (saved_handlers);
#endif

#ifndef DOS_NT
  wait_for_termination (pid, &status, 0);
#endif
  restore_signal_handlers (saved_handlers);
}

static void
save_signal_handlers (struct save_signal *saved_handlers)
{
  while (saved_handlers->code)
    {
      struct sigaction action;
      emacs_sigaction_init (&action, SIG_IGN);
      sigaction (saved_handlers->code, &action, &saved_handlers->action);
      saved_handlers++;
    }
}

static void
restore_signal_handlers (struct save_signal *saved_handlers)
{
  while (saved_handlers->code)
    {
      sigaction (saved_handlers->code, &saved_handlers->action, 0);
      saved_handlers++;
    }
}
\f
#ifdef USABLE_SIGIO
static int old_fcntl_flags[FD_SETSIZE];
#endif

void
init_sigio (int fd)
{
#ifdef USABLE_SIGIO
  old_fcntl_flags[fd] = fcntl (fd, F_GETFL, 0) & ~FASYNC;
  fcntl (fd, F_SETFL, old_fcntl_flags[fd] | FASYNC);
  interrupts_deferred = 0;
#endif
}

#ifndef DOS_NT
static void
reset_sigio (int fd)
{
#ifdef USABLE_SIGIO
  fcntl (fd, F_SETFL, old_fcntl_flags[fd]);
#endif
}
#endif

void
request_sigio (void)
{
#ifdef USABLE_SIGIO
  sigset_t unblocked;

  if (noninteractive)
    return;

  sigemptyset (&unblocked);
# ifdef SIGWINCH
  sigaddset (&unblocked, SIGWINCH);
# endif
  sigaddset (&unblocked, SIGIO);
  pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);

  interrupts_deferred = 0;
#endif
}

void
unrequest_sigio (void)
{
#ifdef USABLE_SIGIO
  sigset_t blocked;

  if (noninteractive)
    return;

  sigemptyset (&blocked);
# ifdef SIGWINCH
  sigaddset (&blocked, SIGWINCH);
# endif
  sigaddset (&blocked, SIGIO);
  pthread_sigmask (SIG_BLOCK, &blocked, 0);
  interrupts_deferred = 1;
#endif
}

void
ignore_sigio (void)
{
#ifdef USABLE_SIGIO
  signal (SIGIO, SIG_IGN);
#endif
}
\f
#ifndef MSDOS
/* Block SIGCHLD.  */

void
block_child_signal (sigset_t *oldset)
{
  sigset_t blocked;
  sigemptyset (&blocked);
  sigaddset (&blocked, SIGCHLD);
  sigaddset (&blocked, SIGINT);
  pthread_sigmask (SIG_BLOCK, &blocked, oldset);
}

/* Unblock SIGCHLD.  */

void
unblock_child_signal (sigset_t const *oldset)
{
  pthread_sigmask (SIG_SETMASK, oldset, 0);
}

#endif	/* !MSDOS */
\f
/* Saving and restoring the process group of Emacs's terminal.  */

/* The process group of which Emacs was a member when it initially
   started.

   If Emacs was in its own process group (i.e. inherited_pgroup ==
   getpid ()), then we know we're running under a shell with job
   control (Emacs would never be run as part of a pipeline).
   Everything is fine.

   If Emacs was not in its own process group, then we know we're
   running under a shell (or a caller) that doesn't know how to
   separate itself from Emacs (like sh).  Emacs must be in its own
   process group in order to receive SIGIO correctly.  In this
   situation, we put ourselves in our own pgroup, forcibly set the
   tty's pgroup to our pgroup, and make sure to restore and reinstate
   the tty's pgroup just like any other terminal setting.  If
   inherited_group was not the tty's pgroup, then we'll get a
   SIGTTmumble when we try to change the tty's pgroup, and a CONT if
   it goes foreground in the future, which is what should happen.  */

static pid_t inherited_pgroup;

void
init_foreground_group (void)
{
  pid_t pgrp = getpgrp ();
  inherited_pgroup = getpid () == pgrp ? 0 : pgrp;
}

/* Block and unblock SIGTTOU.  */

void
block_tty_out_signal (sigset_t *oldset)
{
#ifdef SIGTTOU
  sigset_t blocked;
  sigemptyset (&blocked);
  sigaddset (&blocked, SIGTTOU);
  pthread_sigmask (SIG_BLOCK, &blocked, oldset);
#endif
}

void
unblock_tty_out_signal (sigset_t const *oldset)
{
#ifdef SIGTTOU
  pthread_sigmask (SIG_SETMASK, oldset, 0);
#endif
}

/* Safely set a controlling terminal FD's process group to PGID.
   If we are not in the foreground already, POSIX requires tcsetpgrp
   to deliver a SIGTTOU signal, which would stop us.  This is an
   annoyance, so temporarily ignore the signal.

   In practice, platforms lacking SIGTTOU also lack tcsetpgrp, so
   skip all this unless SIGTTOU is defined.  */
static void
tcsetpgrp_without_stopping (int fd, pid_t pgid)
{
#ifdef SIGTTOU
  sigset_t oldset;
  block_input ();
  block_tty_out_signal (&oldset);
  tcsetpgrp (fd, pgid);
  unblock_tty_out_signal (&oldset);
  unblock_input ();
#endif
}

/* Split off the foreground process group to Emacs alone.  When we are
   in the foreground, but not started in our own process group,
   redirect the tty device handle FD to point to our own process
   group.  FD must be the file descriptor of the controlling tty.  */
static void
narrow_foreground_group (int fd)
{
  if (inherited_pgroup && setpgid (0, 0) == 0)
    tcsetpgrp_without_stopping (fd, getpid ());
}

/* Set the tty to our original foreground group.  */
static void
widen_foreground_group (int fd)
{
  if (inherited_pgroup && setpgid (0, inherited_pgroup) == 0)
    tcsetpgrp_without_stopping (fd, inherited_pgroup);
}
\f
/* Getting and setting emacs_tty structures.  */

/* Set *TC to the parameters associated with the terminal FD,
   or clear it if the parameters are not available.
   Return 0 on success, -1 on failure.  */
int
emacs_get_tty (int fd, struct emacs_tty *settings)
{
  /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
  memset (&settings->main, 0, sizeof (settings->main));
#ifdef DOS_NT
#ifdef WINDOWSNT
  HANDLE h = (HANDLE)_get_osfhandle (fd);
  DWORD console_mode;

  if (h && h != INVALID_HANDLE_VALUE && GetConsoleMode (h, &console_mode))
    {
      settings->main = console_mode;
      return 0;
    }
#endif	/* WINDOWSNT */
  return -1;
#else	/* !DOS_NT */
  /* We have those nifty POSIX tcmumbleattr functions.  */
  return tcgetattr (fd, &settings->main);
#endif
}


/* Set the parameters of the tty on FD according to the contents of
   *SETTINGS.  If FLUSHP, discard input.
   Return 0 if all went well, and -1 (setting errno) if anything failed.  */

int
emacs_set_tty (int fd, struct emacs_tty *settings, bool flushp)
{
  /* Set the primary parameters - baud rate, character size, etcetera.  */
#ifdef DOS_NT
#ifdef WINDOWSNT
  HANDLE h = (HANDLE)_get_osfhandle (fd);

  if (h && h != INVALID_HANDLE_VALUE)
    {
      DWORD new_mode;

      /* Assume the handle is open for input.  */
      if (flushp)
	FlushConsoleInputBuffer (h);
      new_mode = settings->main;
      SetConsoleMode (h, new_mode);
    }
#endif	/* WINDOWSNT */
#else  /* !DOS_NT */
  int i;
  /* We have those nifty POSIX tcmumbleattr functions.
     William J. Smith <wjs@wiis.wang.com> writes:
     "POSIX 1003.1 defines tcsetattr to return success if it was
     able to perform any of the requested actions, even if some
     of the requested actions could not be performed.
     We must read settings back to ensure tty setup properly.
     AIX requires this to keep tty from hanging occasionally."  */
  /* This make sure that we don't loop indefinitely in here.  */
  for (i = 0 ; i < 10 ; i++)
    if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
      {
	if (errno == EINTR)
	  continue;
	else
	  return -1;
      }
    else
      {
	struct termios new;

	memset (&new, 0, sizeof (new));
	/* Get the current settings, and see if they're what we asked for.  */
	tcgetattr (fd, &new);
	/* We cannot use memcmp on the whole structure here because under
	 * aix386 the termios structure has some reserved field that may
	 * not be filled in.
	 */
	if (   new.c_iflag == settings->main.c_iflag
	    && new.c_oflag == settings->main.c_oflag
	    && new.c_cflag == settings->main.c_cflag
	    && new.c_lflag == settings->main.c_lflag
	    && memcmp (new.c_cc, settings->main.c_cc, NCCS) == 0)
	  break;
	else
	  continue;
      }
#endif

  /* We have survived the tempest.  */
  return 0;
}

\f

#ifdef F_SETOWN
static int old_fcntl_owner[FD_SETSIZE];
#endif /* F_SETOWN */

/* This may also be defined in stdio,
   but if so, this does no harm,
   and using the same name avoids wasting the other one's space.  */

#if defined (USG)
unsigned char _sobuf[BUFSIZ+8];
#else
char _sobuf[BUFSIZ];
#endif

/* Initialize the terminal mode on all tty devices that are currently
   open. */

void
init_all_sys_modes (void)
{
  struct tty_display_info *tty;
  for (tty = tty_list; tty; tty = tty->next)
    init_sys_modes (tty);
}

/* Initialize the terminal mode on the given tty device. */

void
init_sys_modes (struct tty_display_info *tty_out)
{
  struct emacs_tty tty;
  Lisp_Object terminal;

  Vtty_erase_char = Qnil;

  if (noninteractive)
    return;

  if (!tty_out->output)
    return;                     /* The tty is suspended. */

  narrow_foreground_group (fileno (tty_out->input));

  if (! tty_out->old_tty)
    tty_out->old_tty = xmalloc (sizeof *tty_out->old_tty);

  emacs_get_tty (fileno (tty_out->input), tty_out->old_tty);

  tty = *tty_out->old_tty;

#if !defined (DOS_NT)
  XSETINT (Vtty_erase_char, tty.main.c_cc[VERASE]);

  tty.main.c_iflag |= (IGNBRK);	/* Ignore break condition */
  tty.main.c_iflag &= ~ICRNL;	/* Disable map of CR to NL on input */
#ifdef INLCR  /* I'm just being cautious,
		 since I can't check how widespread INLCR is--rms.  */
  tty.main.c_iflag &= ~INLCR;	/* Disable map of NL to CR on input */
#endif
#ifdef ISTRIP
  tty.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
  tty.main.c_lflag &= ~ECHO;	/* Disable echo */
  tty.main.c_lflag &= ~ICANON;	/* Disable erase/kill processing */
#ifdef IEXTEN
  tty.main.c_lflag &= ~IEXTEN;	/* Disable other editing characters.  */
#endif
  tty.main.c_lflag |= ISIG;	/* Enable signals */
  if (tty_out->flow_control)
    {
      tty.main.c_iflag |= IXON;	/* Enable start/stop output control */
#ifdef IXANY
      tty.main.c_iflag &= ~IXANY;
#endif /* IXANY */
    }
  else
    tty.main.c_iflag &= ~IXON;	/* Disable start/stop output control */
  tty.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL
                                   on output */
  tty.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
#ifdef CS8
  if (tty_out->meta_key)
    {
      tty.main.c_cflag |= CS8;	/* allow 8th bit on input */
      tty.main.c_cflag &= ~PARENB;/* Don't check parity */
    }
#endif

  XSETTERMINAL(terminal, tty_out->terminal);
  if (!NILP (Fcontrolling_tty_p (terminal)))
    {
      tty.main.c_cc[VINTR] = quit_char;	/* C-g (usually) gives SIGINT */
      /* Set up C-g for both SIGQUIT and SIGINT.
         We don't know which we will get, but we handle both alike
         so which one it really gives us does not matter.  */
      tty.main.c_cc[VQUIT] = quit_char;
    }
  else
    {
      /* We normally don't get interrupt or quit signals from tty
         devices other than our controlling terminal; therefore,
         we must handle C-g as normal input.  Unfortunately, this
         means that the interrupt and quit feature must be
         disabled on secondary ttys, or we would not even see the
         keypress.

         Note that even though emacsclient could have special code
         to pass SIGINT to Emacs, we should _not_ enable
         interrupt/quit keys for emacsclient frames.  This means
         that we can't break out of loops in C code from a
         secondary tty frame, but we can always decide what
         display the C-g came from, which is more important from a
         usability point of view.  (Consider the case when two
         people work together using the same Emacs instance.)  */
      tty.main.c_cc[VINTR] = CDISABLE;
      tty.main.c_cc[VQUIT] = CDISABLE;
    }
  tty.main.c_cc[VMIN] = 1;	/* Input should wait for at least 1 char */
  tty.main.c_cc[VTIME] = 0;	/* no matter how long that takes.  */
#ifdef VSWTCH
  tty.main.c_cc[VSWTCH] = CDISABLE;	/* Turn off shell layering use
					   of C-z */
#endif /* VSWTCH */

#ifdef VSUSP
  tty.main.c_cc[VSUSP] = CDISABLE;	/* Turn off handling of C-z.  */
#endif /* VSUSP */
#ifdef V_DSUSP
  tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off handling of C-y.  */
#endif /* V_DSUSP */
#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
  tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
#ifdef VLNEXT
  tty.main.c_cc[VLNEXT] = CDISABLE;
#endif /* VLNEXT */
#ifdef VREPRINT
  tty.main.c_cc[VREPRINT] = CDISABLE;
#endif /* VREPRINT */
#ifdef VWERASE
  tty.main.c_cc[VWERASE] = CDISABLE;
#endif /* VWERASE */
#ifdef VDISCARD
  tty.main.c_cc[VDISCARD] = CDISABLE;
#endif /* VDISCARD */

  if (tty_out->flow_control)
    {
#ifdef VSTART
      tty.main.c_cc[VSTART] = '\021';
#endif /* VSTART */
#ifdef VSTOP
      tty.main.c_cc[VSTOP] = '\023';
#endif /* VSTOP */
    }
  else
    {
#ifdef VSTART
      tty.main.c_cc[VSTART] = CDISABLE;
#endif /* VSTART */
#ifdef VSTOP
      tty.main.c_cc[VSTOP] = CDISABLE;
#endif /* VSTOP */
    }

#ifdef AIX
  tty.main.c_cc[VSTRT] = CDISABLE;
  tty.main.c_cc[VSTOP] = CDISABLE;
  tty.main.c_cc[VSUSP] = CDISABLE;
  tty.main.c_cc[VDSUSP] = CDISABLE;
  if (tty_out->flow_control)
    {
#ifdef VSTART
      tty.main.c_cc[VSTART] = '\021';
#endif /* VSTART */
#ifdef VSTOP
      tty.main.c_cc[VSTOP] = '\023';
#endif /* VSTOP */
    }
  /* Also, PTY overloads NUL and BREAK.
     don't ignore break, but don't signal either, so it looks like NUL.
     This really serves a purpose only if running in an XTERM window
     or via TELNET or the like, but does no harm elsewhere.  */
  tty.main.c_iflag &= ~IGNBRK;
  tty.main.c_iflag &= ~BRKINT;
#endif
#endif /* not DOS_NT */

#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
  if (!tty_out->term_initted)
    internal_terminal_init ();
  dos_ttraw (tty_out);
#endif

  emacs_set_tty (fileno (tty_out->input), &tty, 0);

  /* This code added to insure that, if flow-control is not to be used,
     we have an unlocked terminal at the start. */

#ifdef TCXONC
  if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TCXONC, 1);
#endif
#ifdef TIOCSTART
  if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TIOCSTART, 0);
#endif

#if !defined (DOS_NT)
#ifdef TCOON
  if (!tty_out->flow_control) tcflow (fileno (tty_out->input), TCOON);
#endif
#endif

#ifdef F_GETOWN
  if (interrupt_input)
    {
      old_fcntl_owner[fileno (tty_out->input)] =
        fcntl (fileno (tty_out->input), F_GETOWN, 0);
      fcntl (fileno (tty_out->input), F_SETOWN, getpid ());
      init_sigio (fileno (tty_out->input));
#ifdef HAVE_GPM
      if (gpm_tty == tty_out)
	{
	  /* Arrange for mouse events to give us SIGIO signals.  */
	  fcntl (gpm_fd, F_SETOWN, getpid ());
	  fcntl (gpm_fd, F_SETFL, fcntl (gpm_fd, F_GETFL, 0) | O_NONBLOCK);
	  init_sigio (gpm_fd);
	}
#endif /* HAVE_GPM */
    }
#endif /* F_GETOWN */

#ifdef _IOFBF
  /* This symbol is defined on recent USG systems.
     Someone says without this call USG won't really buffer the file
     even with a call to setbuf. */
  setvbuf (tty_out->output, (char *) _sobuf, _IOFBF, sizeof _sobuf);
#else
  setbuf (tty_out->output, (char *) _sobuf);
#endif

  if (tty_out->terminal->set_terminal_modes_hook)
    tty_out->terminal->set_terminal_modes_hook (tty_out->terminal);

  if (!tty_out->term_initted)
    {
      Lisp_Object tail, frame;
      FOR_EACH_FRAME (tail, frame)
        {
          /* XXX This needs to be revised. */
          if (FRAME_TERMCAP_P (XFRAME (frame))
              && FRAME_TTY (XFRAME (frame)) == tty_out)
            init_frame_faces (XFRAME (frame));
        }
    }

  if (tty_out->term_initted && no_redraw_on_reenter)
    {
      /* We used to call "direct_output_forward_char(0)" here,
	 but it's not clear why, since it may not do anything anyway.  */
    }
  else
    {
      Lisp_Object tail, frame;
      frame_garbaged = 1;
      FOR_EACH_FRAME (tail, frame)
        {
          if ((FRAME_TERMCAP_P (XFRAME (frame))
	       || FRAME_MSDOS_P (XFRAME (frame)))
              && FRAME_TTY (XFRAME (frame)) == tty_out)
            FRAME_GARBAGED_P (XFRAME (frame)) = 1;
        }
    }

  tty_out->term_initted = 1;
}

/* Return true if safe to use tabs in output.
   At the time this is called, init_sys_modes has not been done yet.  */

bool
tabs_safe_p (int fd)
{
  struct emacs_tty etty;

  emacs_get_tty (fd, &etty);
#ifndef DOS_NT
#ifdef TABDLY
  return ((etty.main.c_oflag & TABDLY) != TAB3);
#else /* not TABDLY */
  return 1;
#endif /* not TABDLY */
#else /* DOS_NT */
  return 0;
#endif /* DOS_NT */
}

/* Discard echoing.  */

void
suppress_echo_on_tty (int fd)
{
  struct emacs_tty etty;

  emacs_get_tty (fd, &etty);
#ifdef DOS_NT
  /* Set raw input mode.  */
  etty.main = 0;
#else
  etty.main.c_lflag &= ~ICANON;	/* Disable buffering */
  etty.main.c_lflag &= ~ECHO;	/* Disable echoing */
#endif /* ! WINDOWSNT */
  emacs_set_tty (fd, &etty, 0);
}
\f
/* Get terminal size from system.
   Store number of lines into *HEIGHTP and width into *WIDTHP.
   We store 0 if there's no valid information.  */

void
get_tty_size (int fd, int *widthp, int *heightp)
{
#if defined TIOCGWINSZ

  /* BSD-style.  */
  struct winsize size;

  if (ioctl (fd, TIOCGWINSZ, &size) == -1)
    *widthp = *heightp = 0;
  else
    {
      *widthp = size.ws_col;
      *heightp = size.ws_row;
    }

#elif defined TIOCGSIZE

  /* SunOS - style.  */
  struct ttysize size;

  if (ioctl (fd, TIOCGSIZE, &size) == -1)
    *widthp = *heightp = 0;
  else
    {
      *widthp = size.ts_cols;
      *heightp = size.ts_lines;
    }

#elif defined WINDOWSNT

  CONSOLE_SCREEN_BUFFER_INFO info;
  if (GetConsoleScreenBufferInfo (GetStdHandle (STD_OUTPUT_HANDLE), &info))
    {
      *widthp = info.srWindow.Right - info.srWindow.Left + 1;
      *heightp = info.srWindow.Bottom - info.srWindow.Top + 1;
    }
  else
    *widthp = *heightp = 0;

#elif defined MSDOS

  *widthp = ScreenCols ();
  *heightp = ScreenRows ();

#else /* system doesn't know size */

  *widthp = 0;
  *heightp = 0;

#endif
}

/* Set the logical window size associated with descriptor FD
   to HEIGHT and WIDTH.  This is used mainly with ptys.
   Return a negative value on failure.  */

int
set_window_size (int fd, int height, int width)
{
#ifdef TIOCSWINSZ

  /* BSD-style.  */
  struct winsize size;
  size.ws_row = height;
  size.ws_col = width;

  return ioctl (fd, TIOCSWINSZ, &size);

#else
#ifdef TIOCSSIZE

  /* SunOS - style.  */
  struct ttysize size;
  size.ts_lines = height;
  size.ts_cols = width;

  return ioctl (fd, TIOCGSIZE, &size);
#else
  return -1;
#endif /* not SunOS-style */
#endif /* not BSD-style */
}

\f

/* Prepare all terminal devices for exiting Emacs. */

void
reset_all_sys_modes (void)
{
  struct tty_display_info *tty;
  for (tty = tty_list; tty; tty = tty->next)
    reset_sys_modes (tty);
}

/* Prepare the terminal for closing it; move the cursor to the
   bottom of the frame, turn off interrupt-driven I/O, etc.  */

void
reset_sys_modes (struct tty_display_info *tty_out)
{
  if (noninteractive)
    {
      fflush (stdout);
      return;
    }
  if (!tty_out->term_initted)
    return;

  if (!tty_out->output)
    return;                     /* The tty is suspended. */

  /* Go to and clear the last line of the terminal. */

  cmgoto (tty_out, FrameRows (tty_out) - 1, 0);

  /* Code adapted from tty_clear_end_of_line. */
  if (tty_out->TS_clr_line)
    {
      emacs_tputs (tty_out, tty_out->TS_clr_line, 1, cmputc);
    }
  else
    {			/* have to do it the hard way */
      int i;
      tty_turn_off_insert (tty_out);

      for (i = cursorX (tty_out); i < FrameCols (tty_out) - 1; i++)
        {
          fputc (' ', tty_out->output);
        }
    }

  cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
  fflush (tty_out->output);

  if (tty_out->terminal->reset_terminal_modes_hook)
    tty_out->terminal->reset_terminal_modes_hook (tty_out->terminal);

  /* Avoid possible loss of output when changing terminal modes.  */
  while (fdatasync (fileno (tty_out->output)) != 0 && errno == EINTR)
    continue;

#ifndef DOS_NT
#ifdef F_SETOWN
  if (interrupt_input)
    {
      reset_sigio (fileno (tty_out->input));
      fcntl (fileno (tty_out->input), F_SETOWN,
             old_fcntl_owner[fileno (tty_out->input)]);
    }
#endif /* F_SETOWN */
  fcntl (fileno (tty_out->input), F_SETFL,
         fcntl (fileno (tty_out->input), F_GETFL, 0) & ~O_NONBLOCK);
#endif

  if (tty_out->old_tty)
    while (emacs_set_tty (fileno (tty_out->input),
                          tty_out->old_tty, 0) < 0 && errno == EINTR)
      ;

#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
  dos_ttcooked ();
#endif

  widen_foreground_group (fileno (tty_out->input));
}
\f
#ifdef HAVE_PTYS

/* Set up the proper status flags for use of a pty.  */

void
setup_pty (int fd)
{
  /* I'm told that TOICREMOTE does not mean control chars
     "can't be sent" but rather that they don't have
     input-editing or signaling effects.
     That should be good, because we have other ways
     to do those things in Emacs.
     However, telnet mode seems not to work on 4.2.
     So TIOCREMOTE is turned off now. */

  /* Under hp-ux, if TIOCREMOTE is turned on, some calls
     will hang.  In particular, the "timeout" feature (which
     causes a read to return if there is no data available)
     does this.  Also it is known that telnet mode will hang
     in such a way that Emacs must be stopped (perhaps this
     is the same problem).

     If TIOCREMOTE is turned off, then there is a bug in
     hp-ux which sometimes loses data.  Apparently the
     code which blocks the master process when the internal
     buffer fills up does not work.  Other than this,
     though, everything else seems to work fine.

     Since the latter lossage is more benign, we may as well
     lose that way.  -- cph */
#ifdef FIONBIO
#if defined (UNIX98_PTYS)
  {
    int on = 1;
    ioctl (fd, FIONBIO, &on);
  }
#endif
#endif
}
#endif /* HAVE_PTYS */
\f
void
init_system_name (void)
{
  char *hostname_alloc = NULL;
  char *hostname;
#ifndef HAVE_GETHOSTNAME
  struct utsname uts;
  uname (&uts);
  hostname = uts.nodename;
#else /* HAVE_GETHOSTNAME */
  char hostname_buf[256];
  ptrdiff_t hostname_size = sizeof hostname_buf;
  hostname = hostname_buf;

  /* Try to get the host name; if the buffer is too short, try
     again.  Apparently, the only indication gethostname gives of
     whether the buffer was large enough is the presence or absence
     of a '\0' in the string.  Eech.  */
  for (;;)
    {
      gethostname (hostname, hostname_size - 1);
      hostname[hostname_size - 1] = '\0';

      /* Was the buffer large enough for the '\0'?  */
      if (strlen (hostname) < hostname_size - 1)
	break;

      hostname = hostname_alloc = xpalloc (hostname_alloc, &hostname_size, 1,
					   min (PTRDIFF_MAX, SIZE_MAX), 1);
    }
#endif /* HAVE_GETHOSTNAME */
  char *p;
  for (p = hostname; *p; p++)
    if (*p == ' ' || *p == '\t')
      *p = '-';
  if (! (STRINGP (Vsystem_name) && SBYTES (Vsystem_name) == p - hostname
	 && strcmp (SSDATA (Vsystem_name), hostname) == 0))
    Vsystem_name = build_string (hostname);
  xfree (hostname_alloc);
}
\f
sigset_t empty_mask;

static struct sigaction process_fatal_action;

static int
emacs_sigaction_flags (void)
{
#ifdef SA_RESTART
  /* SA_RESTART causes interruptible functions with timeouts (e.g.,
     'select') to reset their timeout on some platforms (e.g.,
     HP-UX 11), which is not what we want.  Also, when Emacs is
     interactive, we don't want SA_RESTART because we need to poll
     for pending input so we need long-running syscalls to be interrupted
     after a signal that sets pending_signals.

     Non-interactive keyboard input goes through stdio, where we
     always want restartable system calls.  */
  if (noninteractive)
    return SA_RESTART;
#endif
  return 0;
}

/* Store into *ACTION a signal action suitable for Emacs, with handler
   HANDLER.  */
void
emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
{
  sigemptyset (&action->sa_mask);

  /* When handling a signal, block nonfatal system signals that are caught
     by Emacs.  This makes race conditions less likely.  */
  sigaddset (&action->sa_mask, SIGALRM);
#ifdef SIGCHLD
  sigaddset (&action->sa_mask, SIGCHLD);
#endif
#ifdef SIGDANGER
  sigaddset (&action->sa_mask, SIGDANGER);
#endif
#ifdef PROFILER_CPU_SUPPORT
  sigaddset (&action->sa_mask, SIGPROF);
#endif
#ifdef SIGWINCH
  sigaddset (&action->sa_mask, SIGWINCH);
#endif
  if (! noninteractive)
    {
      sigaddset (&action->sa_mask, SIGINT);
      sigaddset (&action->sa_mask, SIGQUIT);
#ifdef USABLE_SIGIO
      sigaddset (&action->sa_mask, SIGIO);
#endif
    }

  action->sa_handler = handler;
  action->sa_flags = emacs_sigaction_flags ();
}

#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
static pthread_t main_thread;
#endif

/* SIG has arrived at the current process.  Deliver it to the main
   thread, which should handle it with HANDLER.

   If we are on the main thread, handle the signal SIG with HANDLER.
   Otherwise, redirect the signal to the main thread, blocking it from
   this thread.  POSIX says any thread can receive a signal that is
   associated with a process, process group, or asynchronous event.
   On GNU/Linux that is not true, but for other systems (FreeBSD at
   least) it is.  */
void
deliver_process_signal (int sig, signal_handler_t handler)
{
  /* Preserve errno, to avoid race conditions with signal handlers that
     might change errno.  Races can occur even in single-threaded hosts.  */
  int old_errno = errno;

  bool on_main_thread = true;
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
  if (! pthread_equal (pthread_self (), main_thread))
    {
      sigset_t blocked;
      sigemptyset (&blocked);
      sigaddset (&blocked, sig);
      pthread_sigmask (SIG_BLOCK, &blocked, 0);
      pthread_kill (main_thread, sig);
      on_main_thread = false;
    }
#endif
  if (on_main_thread)
    handler (sig);

  errno = old_errno;
}

/* Static location to save a fatal backtrace in a thread.
   FIXME: If two subsidiary threads fail simultaneously, the resulting
   backtrace may be garbage.  */
enum { BACKTRACE_LIMIT_MAX = 500 };
static void *thread_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
static int thread_backtrace_npointers;

/* SIG has arrived at the current thread.
   If we are on the main thread, handle the signal SIG with HANDLER.
   Otherwise, this is a fatal error in the handling thread.  */
static void
deliver_thread_signal (int sig, signal_handler_t handler)
{
  int old_errno = errno;

#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
  if (! pthread_equal (pthread_self (), main_thread))
    {
      thread_backtrace_npointers
	= backtrace (thread_backtrace_buffer, BACKTRACE_LIMIT_MAX);
      sigaction (sig, &process_fatal_action, 0);
      pthread_kill (main_thread, sig);

      /* Avoid further damage while the main thread is exiting.  */
      while (1)
	sigsuspend (&empty_mask);
    }
#endif

  handler (sig);
  errno = old_errno;
}
\f
#if !HAVE_DECL_SYS_SIGLIST
# undef sys_siglist
# ifdef _sys_siglist
#  define sys_siglist _sys_siglist
# elif HAVE_DECL___SYS_SIGLIST
#  define sys_siglist __sys_siglist
# else
#  define sys_siglist my_sys_siglist
static char const *sys_siglist[NSIG];
# endif
#endif

#ifdef _sys_nsig
# define sys_siglist_entries _sys_nsig
#else
# define sys_siglist_entries NSIG
#endif

/* Handle bus errors, invalid instruction, etc.  */
static void
handle_fatal_signal (int sig)
{
  terminate_due_to_signal (sig, 40);
}

static void
deliver_fatal_signal (int sig)
{
  deliver_process_signal (sig, handle_fatal_signal);
}

static void
deliver_fatal_thread_signal (int sig)
{
  deliver_thread_signal (sig, handle_fatal_signal);
}

static _Noreturn void
handle_arith_signal (int sig)
{
  pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
  xsignal0 (Qarith_error);
}

#ifdef HAVE_STACK_OVERFLOW_HANDLING

/* -1 if stack grows down as expected on most OS/ABI variants, 1 otherwise.  */

static int stack_direction;

/* Alternate stack used by SIGSEGV handler below.  */

static unsigned char sigsegv_stack[SIGSTKSZ];

/* Attempt to recover from SIGSEGV caused by C stack overflow.  */

static void
handle_sigsegv (int sig, siginfo_t *siginfo, void *arg)
{
  /* Hard GC error may lead to stack overflow caused by
     too nested calls to mark_object.  No way to survive.  */
  if (!gc_in_progress)
    {
      struct rlimit rlim;

      if (!getrlimit (RLIMIT_STACK, &rlim))
	{
	  enum { STACK_DANGER_ZONE = 16 * 1024 };
	  char *beg, *end, *addr;

	  beg = stack_bottom;
	  end = stack_bottom + stack_direction * rlim.rlim_cur;
	  if (beg > end)
	    addr = beg, beg = end, end = addr;
	  addr = (char *) siginfo->si_addr;
	  /* If we're somewhere on stack and too close to
	     one of its boundaries, most likely this is it.  */
	  if (beg < addr && addr < end
	      && (addr - beg < STACK_DANGER_ZONE
		  || end - addr < STACK_DANGER_ZONE))
	    siglongjmp (return_to_command_loop, 1);
	}
    }

  /* Otherwise we can't do anything with this.  */
  deliver_fatal_thread_signal (sig);
}

/* Return true if we have successfully set up SIGSEGV handler on alternate
   stack.  Otherwise we just treat SIGSEGV among the rest of fatal signals.  */

static bool
init_sigsegv (void)
{
  struct sigaction sa;
  stack_t ss;

  stack_direction = ((char *) &ss < stack_bottom) ? -1 : 1;

  ss.ss_sp = sigsegv_stack;
  ss.ss_size = sizeof (sigsegv_stack);
  ss.ss_flags = 0;
  if (sigaltstack (&ss, NULL) < 0)
    return 0;

  sigfillset (&sa.sa_mask);
  sa.sa_sigaction = handle_sigsegv;
  sa.sa_flags = SA_SIGINFO | SA_ONSTACK | emacs_sigaction_flags ();
  return sigaction (SIGSEGV, &sa, NULL) < 0 ? 0 : 1;
}

#else /* not HAVE_STACK_OVERFLOW_HANDLING */

static bool
init_sigsegv (void)
{
  return 0;
}

#endif /* HAVE_STACK_OVERFLOW_HANDLING */

static void
deliver_arith_signal (int sig)
{
  deliver_thread_signal (sig, handle_arith_signal);
}

#ifdef SIGDANGER

/* Handler for SIGDANGER.  */
static void
handle_danger_signal (int sig)
{
  malloc_warning ("Operating system warns that virtual memory is running low.\n");

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
}

static void
deliver_danger_signal (int sig)
{
  deliver_process_signal (sig, handle_danger_signal);
}
#endif

/* Treat SIG as a terminating signal, unless it is already ignored and
   we are in --batch mode.  Among other things, this makes nohup work.  */
static void
maybe_fatal_sig (int sig)
{
  bool catch_sig = !noninteractive;
  if (!catch_sig)
    {
      struct sigaction old_action;
      sigaction (sig, 0, &old_action);
      catch_sig = old_action.sa_handler != SIG_IGN;
    }
  if (catch_sig)
    sigaction (sig, &process_fatal_action, 0);
}

void
init_signals (bool dumping)
{
  struct sigaction thread_fatal_action;
  struct sigaction action;

  sigemptyset (&empty_mask);

#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
  main_thread = pthread_self ();
#endif

#if !HAVE_DECL_SYS_SIGLIST && !defined _sys_siglist
  if (! initialized)
    {
      sys_siglist[SIGABRT] = "Aborted";
# ifdef SIGAIO
      sys_siglist[SIGAIO] = "LAN I/O interrupt";
# endif
      sys_siglist[SIGALRM] = "Alarm clock";
# ifdef SIGBUS
      sys_siglist[SIGBUS] = "Bus error";
# endif
# ifdef SIGCHLD
      sys_siglist[SIGCHLD] = "Child status changed";
# endif
# ifdef SIGCONT
      sys_siglist[SIGCONT] = "Continued";
# endif
# ifdef SIGDANGER
      sys_siglist[SIGDANGER] = "Swap space dangerously low";
# endif
# ifdef SIGDGNOTIFY
      sys_siglist[SIGDGNOTIFY] = "Notification message in queue";
# endif
# ifdef SIGEMT
      sys_siglist[SIGEMT] = "Emulation trap";
# endif
      sys_siglist[SIGFPE] = "Arithmetic exception";
# ifdef SIGFREEZE
      sys_siglist[SIGFREEZE] = "SIGFREEZE";
# endif
# ifdef SIGGRANT
      sys_siglist[SIGGRANT] = "Monitor mode granted";
# endif
      sys_siglist[SIGHUP] = "Hangup";
      sys_siglist[SIGILL] = "Illegal instruction";
      sys_siglist[SIGINT] = "Interrupt";
# ifdef SIGIO
      sys_siglist[SIGIO] = "I/O possible";
# endif
# ifdef SIGIOINT
      sys_siglist[SIGIOINT] = "I/O intervention required";
# endif
# ifdef SIGIOT
      sys_siglist[SIGIOT] = "IOT trap";
# endif
      sys_siglist[SIGKILL] = "Killed";
# ifdef SIGLOST
      sys_siglist[SIGLOST] = "Resource lost";
# endif
# ifdef SIGLWP
      sys_siglist[SIGLWP] = "SIGLWP";
# endif
# ifdef SIGMSG
      sys_siglist[SIGMSG] = "Monitor mode data available";
# endif
# ifdef SIGPHONE
      sys_siglist[SIGWIND] = "SIGPHONE";
# endif
      sys_siglist[SIGPIPE] = "Broken pipe";
# ifdef SIGPOLL
      sys_siglist[SIGPOLL] = "Pollable event occurred";
# endif
# ifdef SIGPROF
      sys_siglist[SIGPROF] = "Profiling timer expired";
# endif
# ifdef SIGPTY
      sys_siglist[SIGPTY] = "PTY I/O interrupt";
# endif
# ifdef SIGPWR
      sys_siglist[SIGPWR] = "Power-fail restart";
# endif
      sys_siglist[SIGQUIT] = "Quit";
# ifdef SIGRETRACT
      sys_siglist[SIGRETRACT] = "Need to relinquish monitor mode";
# endif
# ifdef SIGSAK
      sys_siglist[SIGSAK] = "Secure attention";
# endif
      sys_siglist[SIGSEGV] = "Segmentation violation";
# ifdef SIGSOUND
      sys_siglist[SIGSOUND] = "Sound completed";
# endif
# ifdef SIGSTOP
      sys_siglist[SIGSTOP] = "Stopped (signal)";
# endif
# ifdef SIGSTP
      sys_siglist[SIGSTP] = "Stopped (user)";
# endif
# ifdef SIGSYS
      sys_siglist[SIGSYS] = "Bad argument to system call";
# endif
      sys_siglist[SIGTERM] = "Terminated";
# ifdef SIGTHAW
      sys_siglist[SIGTHAW] = "SIGTHAW";
# endif
# ifdef SIGTRAP
      sys_siglist[SIGTRAP] = "Trace/breakpoint trap";
# endif
# ifdef SIGTSTP
      sys_siglist[SIGTSTP] = "Stopped (user)";
# endif
# ifdef SIGTTIN
      sys_siglist[SIGTTIN] = "Stopped (tty input)";
# endif
# ifdef SIGTTOU
      sys_siglist[SIGTTOU] = "Stopped (tty output)";
# endif
# ifdef SIGURG
      sys_siglist[SIGURG] = "Urgent I/O condition";
# endif
# ifdef SIGUSR1
      sys_siglist[SIGUSR1] = "User defined signal 1";
# endif
# ifdef SIGUSR2
      sys_siglist[SIGUSR2] = "User defined signal 2";
# endif
# ifdef SIGVTALRM
      sys_siglist[SIGVTALRM] = "Virtual timer expired";
# endif
# ifdef SIGWAITING
      sys_siglist[SIGWAITING] = "Process's LWPs are blocked";
# endif
# ifdef SIGWINCH
      sys_siglist[SIGWINCH] = "Window size changed";
# endif
# ifdef SIGWIND
      sys_siglist[SIGWIND] = "SIGWIND";
# endif
# ifdef SIGXCPU
      sys_siglist[SIGXCPU] = "CPU time limit exceeded";
# endif
# ifdef SIGXFSZ
      sys_siglist[SIGXFSZ] = "File size limit exceeded";
# endif
    }
#endif /* !HAVE_DECL_SYS_SIGLIST && !_sys_siglist */

  /* Don't alter signal handlers if dumping.  On some machines,
     changing signal handlers sets static data that would make signals
     fail to work right when the dumped Emacs is run.  */
  if (dumping)
    return;

  sigfillset (&process_fatal_action.sa_mask);
  process_fatal_action.sa_handler = deliver_fatal_signal;
  process_fatal_action.sa_flags = emacs_sigaction_flags ();

  sigfillset (&thread_fatal_action.sa_mask);
  thread_fatal_action.sa_handler = deliver_fatal_thread_signal;
  thread_fatal_action.sa_flags = process_fatal_action.sa_flags;

  /* SIGINT may need special treatment on MS-Windows.  See
     http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg01062.html
     Please update the doc of kill-emacs, kill-emacs-hook, and
     NEWS if you change this.  */

  maybe_fatal_sig (SIGHUP);
  maybe_fatal_sig (SIGINT);
  maybe_fatal_sig (SIGTERM);

  /* Emacs checks for write errors, so it can safely ignore SIGPIPE.
     However, in batch mode leave SIGPIPE alone, as that causes Emacs
     to behave more like typical batch applications do.  */
  if (! noninteractive)
    signal (SIGPIPE, SIG_IGN);

  sigaction (SIGQUIT, &process_fatal_action, 0);
  sigaction (SIGILL, &thread_fatal_action, 0);
  sigaction (SIGTRAP, &thread_fatal_action, 0);

  /* Typically SIGFPE is thread-specific and is fatal, like SIGILL.
     But on a non-IEEE host SIGFPE can come from a trap in the Lisp
     interpreter's floating point operations, so treat SIGFPE as an
     arith-error if it arises in the main thread.  */
  if (IEEE_FLOATING_POINT)
    sigaction (SIGFPE, &thread_fatal_action, 0);
  else
    {
      emacs_sigaction_init (&action, deliver_arith_signal);
      sigaction (SIGFPE, &action, 0);
    }

#ifdef SIGUSR1
  add_user_signal (SIGUSR1, "sigusr1");
#endif
#ifdef SIGUSR2
  add_user_signal (SIGUSR2, "sigusr2");
#endif
  sigaction (SIGABRT, &thread_fatal_action, 0);
#ifdef SIGPRE
  sigaction (SIGPRE, &thread_fatal_action, 0);
#endif
#ifdef SIGORE
  sigaction (SIGORE, &thread_fatal_action, 0);
#endif
#ifdef SIGUME
  sigaction (SIGUME, &thread_fatal_action, 0);
#endif
#ifdef SIGDLK
  sigaction (SIGDLK, &process_fatal_action, 0);
#endif
#ifdef SIGCPULIM
  sigaction (SIGCPULIM, &process_fatal_action, 0);
#endif
#ifdef SIGIOT
  sigaction (SIGIOT, &thread_fatal_action, 0);
#endif
#ifdef SIGEMT
  sigaction (SIGEMT, &thread_fatal_action, 0);
#endif
#ifdef SIGBUS
  sigaction (SIGBUS, &thread_fatal_action, 0);
#endif
  if (!init_sigsegv ())
    sigaction (SIGSEGV, &thread_fatal_action, 0);
#ifdef SIGSYS
  sigaction (SIGSYS, &thread_fatal_action, 0);
#endif
  sigaction (SIGTERM, &process_fatal_action, 0);
#ifdef SIGPROF
  signal (SIGPROF, SIG_IGN);
#endif
#ifdef SIGVTALRM
  sigaction (SIGVTALRM, &process_fatal_action, 0);
#endif
#ifdef SIGXCPU
  sigaction (SIGXCPU, &process_fatal_action, 0);
#endif
#ifdef SIGXFSZ
  sigaction (SIGXFSZ, &process_fatal_action, 0);
#endif

#ifdef SIGDANGER
  /* This just means available memory is getting low.  */
  emacs_sigaction_init (&action, deliver_danger_signal);
  sigaction (SIGDANGER, &action, 0);
#endif

  /* AIX-specific signals.  */
#ifdef SIGGRANT
  sigaction (SIGGRANT, &process_fatal_action, 0);
#endif
#ifdef SIGMIGRATE
  sigaction (SIGMIGRATE, &process_fatal_action, 0);
#endif
#ifdef SIGMSG
  sigaction (SIGMSG, &process_fatal_action, 0);
#endif
#ifdef SIGRETRACT
  sigaction (SIGRETRACT, &process_fatal_action, 0);
#endif
#ifdef SIGSAK
  sigaction (SIGSAK, &process_fatal_action, 0);
#endif
#ifdef SIGSOUND
  sigaction (SIGSOUND, &process_fatal_action, 0);
#endif
#ifdef SIGTALRM
  sigaction (SIGTALRM, &thread_fatal_action, 0);
#endif
}
\f
#ifndef HAVE_RANDOM
#ifdef random
#define HAVE_RANDOM
#endif
#endif

/* Figure out how many bits the system's random number generator uses.
   `random' and `lrand48' are assumed to return 31 usable bits.
   BSD `rand' returns a 31 bit value but the low order bits are unusable;
   so we'll shift it and treat it like the 15-bit USG `rand'.  */

#ifndef RAND_BITS
# ifdef HAVE_RANDOM
#  define RAND_BITS 31
# else /* !HAVE_RANDOM */
#  ifdef HAVE_LRAND48
#   define RAND_BITS 31
#   define random lrand48
#  else /* !HAVE_LRAND48 */
#   define RAND_BITS 15
#   if RAND_MAX == 32767
#    define random rand
#   else /* RAND_MAX != 32767 */
#    if RAND_MAX == 2147483647
#     define random() (rand () >> 16)
#    else /* RAND_MAX != 2147483647 */
#     ifdef USG
#      define random rand
#     else
#      define random() (rand () >> 16)
#     endif /* !USG */
#    endif /* RAND_MAX != 2147483647 */
#   endif /* RAND_MAX != 32767 */
#  endif /* !HAVE_LRAND48 */
# endif /* !HAVE_RANDOM */
#endif /* !RAND_BITS */

void
seed_random (void *seed, ptrdiff_t seed_size)
{
#if defined HAVE_RANDOM || ! defined HAVE_LRAND48
  unsigned int arg = 0;
#else
  long int arg = 0;
#endif
  unsigned char *argp = (unsigned char *) &arg;
  unsigned char *seedp = seed;
  ptrdiff_t i;
  for (i = 0; i < seed_size; i++)
    argp[i % sizeof arg] ^= seedp[i];
#ifdef HAVE_RANDOM
  srandom (arg);
#else
# ifdef HAVE_LRAND48
  srand48 (arg);
# else
  srand (arg);
# endif
#endif
}

void
init_random (void)
{
  struct timespec t = current_timespec ();
  uintmax_t v = getpid () ^ t.tv_sec ^ t.tv_nsec;
  seed_random (&v, sizeof v);
}

/*
 * Return a nonnegative random integer out of whatever we've got.
 * It contains enough bits to make a random (signed) Emacs fixnum.
 * This suffices even for a 64-bit architecture with a 15-bit rand.
 */
EMACS_INT
get_random (void)
{
  EMACS_UINT val = 0;
  int i;
  for (i = 0; i < (FIXNUM_BITS + RAND_BITS - 1) / RAND_BITS; i++)
    val = (random () ^ (val << RAND_BITS)
	   ^ (val >> (BITS_PER_EMACS_INT - RAND_BITS)));
  val ^= val >> (BITS_PER_EMACS_INT - FIXNUM_BITS);
  return val & INTMASK;
}

#ifndef HAVE_SNPRINTF
/* Approximate snprintf as best we can on ancient hosts that lack it.  */
int
snprintf (char *buf, size_t bufsize, char const *format, ...)
{
  ptrdiff_t size = min (bufsize, PTRDIFF_MAX);
  ptrdiff_t nbytes = size - 1;
  va_list ap;

  if (size)
    {
      va_start (ap, format);
      nbytes = doprnt (buf, size, format, 0, ap);
      va_end (ap);
    }

  if (nbytes == size - 1)
    {
      /* Calculate the length of the string that would have been created
	 had the buffer been large enough.  */
      char stackbuf[4000];
      char *b = stackbuf;
      ptrdiff_t bsize = sizeof stackbuf;
      va_start (ap, format);
      nbytes = evxprintf (&b, &bsize, stackbuf, -1, format, ap);
      va_end (ap);
      if (b != stackbuf)
	xfree (b);
    }

  if (INT_MAX < nbytes)
    {
#ifdef EOVERFLOW
      errno = EOVERFLOW;
#else
      errno = EDOM;
#endif
      return -1;
    }
  return nbytes;
}
#endif
\f
/* If a backtrace is available, output the top lines of it to stderr.
   Do not output more than BACKTRACE_LIMIT or BACKTRACE_LIMIT_MAX lines.
   This function may be called from a signal handler, so it should
   not invoke async-unsafe functions like malloc.

   If BACKTRACE_LIMIT is -1, initialize tables that 'backtrace' uses
   but do not output anything.  This avoids some problems that can
   otherwise occur if the malloc arena is corrupted before 'backtrace'
   is called, since 'backtrace' may call malloc if the tables are not
   initialized.

   If the static variable THREAD_BACKTRACE_NPOINTERS is nonzero, a
   fatal error has occurred in some other thread; generate a thread
   backtrace instead, ignoring BACKTRACE_LIMIT.  */
void
emacs_backtrace (int backtrace_limit)
{
  void *main_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
  int bounded_limit = min (backtrace_limit, BACKTRACE_LIMIT_MAX);
  void *buffer;
  int npointers;

  if (thread_backtrace_npointers)
    {
      buffer = thread_backtrace_buffer;
      npointers = thread_backtrace_npointers;
    }
  else
    {
      buffer = main_backtrace_buffer;

      /* Work around 'backtrace' bug; see Bug#19959 and glibc bug#18084.  */
      if (bounded_limit < 0)
	{
	  backtrace (buffer, 1);
	  return;
	}

      npointers = backtrace (buffer, bounded_limit + 1);
    }

  if (npointers)
    {
      emacs_write (STDERR_FILENO, "\nBacktrace:\n", 12);
      backtrace_symbols_fd (buffer, npointers, STDERR_FILENO);
      if (bounded_limit < npointers)
	emacs_write (STDERR_FILENO, "...\n", 4);
    }
}
\f
#ifndef HAVE_NTGUI
void
emacs_abort (void)
{
  terminate_due_to_signal (SIGABRT, 40);
}
#endif

/* Open FILE for Emacs use, using open flags OFLAG and mode MODE.
   Use binary I/O on systems that care about text vs binary I/O.
   Arrange for subprograms to not inherit the file descriptor.
   Prefer a method that is multithread-safe, if available.
   Do not fail merely because the open was interrupted by a signal.
   Allow the user to quit.  */

int
emacs_open (const char *file, int oflags, int mode)
{
  int fd;
  if (! (oflags & O_TEXT))
    oflags |= O_BINARY;
  oflags |= O_CLOEXEC;
  while ((fd = open (file, oflags, mode)) < 0 && errno == EINTR)
    QUIT;
  if (! O_CLOEXEC && 0 <= fd)
    fcntl (fd, F_SETFD, FD_CLOEXEC);
  return fd;
}

/* Open FILE as a stream for Emacs use, with mode MODE.
   Act like emacs_open with respect to threads, signals, and quits.  */

FILE *
emacs_fopen (char const *file, char const *mode)
{
  int fd, omode, oflags;
  int bflag = 0;
  char const *m = mode;

  switch (*m++)
    {
    case 'r': omode = O_RDONLY; oflags = 0; break;
    case 'w': omode = O_WRONLY; oflags = O_CREAT | O_TRUNC; break;
    case 'a': omode = O_WRONLY; oflags = O_CREAT | O_APPEND; break;
    default: emacs_abort ();
    }

  while (*m)
    switch (*m++)
      {
      case '+': omode = O_RDWR; break;
      case 'b': bflag = O_BINARY; break;
      case 't': bflag = O_TEXT; break;
      default: /* Ignore.  */ break;
      }

  fd = emacs_open (file, omode | oflags | bflag, 0666);
  return fd < 0 ? 0 : fdopen (fd, mode);
}

/* Create a pipe for Emacs use.  */

int
emacs_pipe (int fd[2])
{
#ifdef MSDOS
  return pipe (fd);
#else  /* !MSDOS */
  int result = pipe2 (fd, O_BINARY | O_CLOEXEC);
  if (! O_CLOEXEC && result == 0)
    {
      fcntl (fd[0], F_SETFD, FD_CLOEXEC);
      fcntl (fd[1], F_SETFD, FD_CLOEXEC);
    }
  return result;
#endif	/* !MSDOS */
}

#ifndef WINDOWSNT
/* For make-pipe-process  */
int
pipe_open (int wfd[2], int rfd[2])
{
  int result;
  int inchannel, outchannel;
#ifdef MSDOS
  result = pipe (wfd);
  if (result < 0)
    return -1;
  result = pipe (rfd);
  if (result 0)
    return -1;
#else  /* !MSDOS */
  result = pipe2 (wfd, O_BINARY);
  if (result < 0)
    return -1;
  result = pipe2 (rfd, O_BINARY);
  if (result < 0)
    return -1;

  inchannel = rfd[0];
  outchannel = wfd[1];

  fcntl (inchannel, F_SETFD, FD_CLOEXEC);
  fcntl (outchannel, F_SETFD, FD_CLOEXEC);

  fcntl (inchannel, F_SETFL, O_NONBLOCK);
  fcntl (outchannel, F_SETFL, O_NONBLOCK);
#endif	/* !MSDOS */

  return 0;
}
#endif	/* !WINDOWSNT */

/* Approximate posix_close and POSIX_CLOSE_RESTART well enough for Emacs.
   For the background behind this mess, please see Austin Group defect 529
   <http://austingroupbugs.net/view.php?id=529>.  */

#ifndef POSIX_CLOSE_RESTART
# define POSIX_CLOSE_RESTART 1
static int
posix_close (int fd, int flag)
{
  /* Only the POSIX_CLOSE_RESTART case is emulated.  */
  eassert (flag == POSIX_CLOSE_RESTART);

  /* Things are tricky if close (fd) returns -1 with errno == EINTR
     on a system that does not define POSIX_CLOSE_RESTART.

     In this case, in some systems (e.g., GNU/Linux, AIX) FD is
     closed, and retrying the close could inadvertently close a file
     descriptor allocated by some other thread.  In other systems
     (e.g., HP/UX) FD is not closed.  And in still other systems
     (e.g., OS X, Solaris), maybe FD is closed, maybe not, and in a
     multithreaded program there can be no way to tell.

     So, in this case, pretend that the close succeeded.  This works
     well on systems like GNU/Linux that close FD.  Although it may
     leak a file descriptor on other systems, the leak is unlikely and
     it's better to leak than to close a random victim.  */
  return close (fd) == 0 || errno == EINTR ? 0 : -1;
}
#endif

/* Close FD, retrying if interrupted.  If successful, return 0;
   otherwise, return -1 and set errno to a non-EINTR value.  Consider
   an EINPROGRESS error to be successful, as that's merely a signal
   arriving.  FD is always closed when this function returns, even
   when it returns -1.

   Do not call this function if FD is nonnegative and might already be closed,
   as that might close an innocent victim opened by some other thread.  */

int
emacs_close (int fd)
{
  while (1)
    {
      int r = posix_close (fd, POSIX_CLOSE_RESTART);
      if (r == 0)
	return r;
      if (!POSIX_CLOSE_RESTART || errno != EINTR)
	{
	  eassert (errno != EBADF || fd < 0);
	  return errno == EINPROGRESS ? 0 : r;
	}
    }
}

/* Maximum number of bytes to read or write in a single system call.
   This works around a serious bug in Linux kernels before 2.6.16; see
   <https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=612839>.
   It's likely to work around similar bugs in other operating systems, so do it
   on all platforms.  Round INT_MAX down to a page size, with the conservative
   assumption that page sizes are at most 2**18 bytes (any kernel with a
   page size larger than that shouldn't have the bug).  */
#ifndef MAX_RW_COUNT
#define MAX_RW_COUNT (INT_MAX >> 18 << 18)
#endif

/* Read from FILEDESC to a buffer BUF with size NBYTE, retrying if interrupted.
   Return the number of bytes read, which might be less than NBYTE.
   On error, set errno and return -1.  */
ptrdiff_t
emacs_read (int fildes, void *buf, ptrdiff_t nbyte)
{
  ssize_t rtnval;

  /* There is no need to check against MAX_RW_COUNT, since no caller ever
     passes a size that large to emacs_read.  */

  while ((rtnval = read (fildes, buf, nbyte)) == -1
	 && (errno == EINTR))
    QUIT;
  return (rtnval);
}

/* Write to FILEDES from a buffer BUF with size NBYTE, retrying if interrupted
   or if a partial write occurs.  If interrupted, process pending
   signals if PROCESS SIGNALS.  Return the number of bytes written, setting
   errno if this is less than NBYTE.  */
static ptrdiff_t
emacs_full_write (int fildes, char const *buf, ptrdiff_t nbyte,
		  bool process_signals)
{
  ptrdiff_t bytes_written = 0;

  while (nbyte > 0)
    {
      ssize_t n = write (fildes, buf, min (nbyte, MAX_RW_COUNT));

      if (n < 0)
	{
	  if (errno == EINTR)
	    {
	      /* I originally used `QUIT' but that might cause files to
		 be truncated if you hit C-g in the middle of it.  --Stef  */
	      if (process_signals && pending_signals)
		process_pending_signals ();
	      continue;
	    }
	  else
	    break;
	}

      buf += n;
      nbyte -= n;
      bytes_written += n;
    }

  return bytes_written;
}

/* Write to FILEDES from a buffer BUF with size NBYTE, retrying if
   interrupted or if a partial write occurs.  Return the number of
   bytes written, setting errno if this is less than NBYTE.  */
ptrdiff_t
emacs_write (int fildes, void const *buf, ptrdiff_t nbyte)
{
  return emacs_full_write (fildes, buf, nbyte, 0);
}

/* Like emacs_write, but also process pending signals if interrupted.  */
ptrdiff_t
emacs_write_sig (int fildes, void const *buf, ptrdiff_t nbyte)
{
  return emacs_full_write (fildes, buf, nbyte, 1);
}

/* Write a diagnostic to standard error that contains MESSAGE and a
   string derived from errno.  Preserve errno.  Do not buffer stderr.
   Do not process pending signals if interrupted.  */
void
emacs_perror (char const *message)
{
  int err = errno;
  char const *error_string = strerror (err);
  char const *command = (initial_argv && initial_argv[0]
			 ? initial_argv[0] : "emacs");
  /* Write it out all at once, if it's short; this is less likely to
     be interleaved with other output.  */
  char buf[BUFSIZ];
  int nbytes = snprintf (buf, sizeof buf, "%s: %s: %s\n",
			 command, message, error_string);
  if (0 <= nbytes && nbytes < BUFSIZ)
    emacs_write (STDERR_FILENO, buf, nbytes);
  else
    {
      emacs_write (STDERR_FILENO, command, strlen (command));
      emacs_write (STDERR_FILENO, ": ", 2);
      emacs_write (STDERR_FILENO, message, strlen (message));
      emacs_write (STDERR_FILENO, ": ", 2);
      emacs_write (STDERR_FILENO, error_string, strlen (error_string));
      emacs_write (STDERR_FILENO, "\n", 1);
    }
  errno = err;
}
\f
/* Return a struct timeval that is roughly equivalent to T.
   Use the least timeval not less than T.
   Return an extremal value if the result would overflow.  */
struct timeval
make_timeval (struct timespec t)
{
  struct timeval tv;
  tv.tv_sec = t.tv_sec;
  tv.tv_usec = t.tv_nsec / 1000;

  if (t.tv_nsec % 1000 != 0)
    {
      if (tv.tv_usec < 999999)
	tv.tv_usec++;
      else if (tv.tv_sec < TYPE_MAXIMUM (time_t))
	{
	  tv.tv_sec++;
	  tv.tv_usec = 0;
	}
    }

  return tv;
}

/* Set the access and modification time stamps of FD (a.k.a. FILE) to be
   ATIME and MTIME, respectively.
   FD must be either negative -- in which case it is ignored --
   or a file descriptor that is open on FILE.
   If FD is nonnegative, then FILE can be NULL.  */
int
set_file_times (int fd, const char *filename,
		struct timespec atime, struct timespec mtime)
{
  struct timespec timespec[2];
  timespec[0] = atime;
  timespec[1] = mtime;
  return fdutimens (fd, filename, timespec);
}
\f
/* Like strsignal, except async-signal-safe, and this function typically
   returns a string in the C locale rather than the current locale.  */
char const *
safe_strsignal (int code)
{
  char const *signame = 0;

  if (0 <= code && code < sys_siglist_entries)
    signame = sys_siglist[code];
  if (! signame)
    signame = "Unknown signal";

  return signame;
}
\f
#ifndef DOS_NT
/* For make-serial-process  */
int
serial_open (Lisp_Object port)
{
  int fd = emacs_open (SSDATA (port), O_RDWR | O_NOCTTY | O_NONBLOCK, 0);
  if (fd < 0)
    report_file_error ("Opening serial port", port);
#ifdef TIOCEXCL
  ioctl (fd, TIOCEXCL, (char *) 0);
#endif

  return fd;
}

#if !defined (HAVE_CFMAKERAW)
/* Workaround for targets which are missing cfmakeraw.  */
/* Pasted from man page.  */
static void
cfmakeraw (struct termios *termios_p)
{
    termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
    termios_p->c_oflag &= ~OPOST;
    termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
    termios_p->c_cflag &= ~(CSIZE|PARENB);
    termios_p->c_cflag |= CS8;
}
#endif /* !defined (HAVE_CFMAKERAW */

#if !defined (HAVE_CFSETSPEED)
/* Workaround for targets which are missing cfsetspeed.  */
static int
cfsetspeed (struct termios *termios_p, speed_t vitesse)
{
  return (cfsetispeed (termios_p, vitesse)
	  + cfsetospeed (termios_p, vitesse));
}
#endif

/* For serial-process-configure  */
void
serial_configure (struct Lisp_Process *p,
		  Lisp_Object contact)
{
  Lisp_Object childp2 = Qnil;
  Lisp_Object tem = Qnil;
  struct termios attr;
  int err;
  char summary[4] = "???"; /* This usually becomes "8N1".  */

  childp2 = Fcopy_sequence (p->childp);

  /* Read port attributes and prepare default configuration.  */
  err = tcgetattr (p->outfd, &attr);
  if (err != 0)
    report_file_error ("Failed tcgetattr", Qnil);
  cfmakeraw (&attr);
#if defined (CLOCAL)
  attr.c_cflag |= CLOCAL;
#endif
#if defined (CREAD)
  attr.c_cflag |= CREAD;
#endif

  /* Configure speed.  */
  if (!NILP (Fplist_member (contact, QCspeed)))
    tem = Fplist_get (contact, QCspeed);
  else
    tem = Fplist_get (p->childp, QCspeed);
  CHECK_NUMBER (tem);
  err = cfsetspeed (&attr, XINT (tem));
  if (err != 0)
    report_file_error ("Failed cfsetspeed", tem);
  childp2 = Fplist_put (childp2, QCspeed, tem);

  /* Configure bytesize.  */
  if (!NILP (Fplist_member (contact, QCbytesize)))
    tem = Fplist_get (contact, QCbytesize);
  else
    tem = Fplist_get (p->childp, QCbytesize);
  if (NILP (tem))
    tem = make_number (8);
  CHECK_NUMBER (tem);
  if (XINT (tem) != 7 && XINT (tem) != 8)
    error (":bytesize must be nil (8), 7, or 8");
  summary[0] = XINT (tem) + '0';
#if defined (CSIZE) && defined (CS7) && defined (CS8)
  attr.c_cflag &= ~CSIZE;
  attr.c_cflag |= ((XINT (tem) == 7) ? CS7 : CS8);
#else
  /* Don't error on bytesize 8, which should be set by cfmakeraw.  */
  if (XINT (tem) != 8)
    error ("Bytesize cannot be changed");
#endif
  childp2 = Fplist_put (childp2, QCbytesize, tem);

  /* Configure parity.  */
  if (!NILP (Fplist_member (contact, QCparity)))
    tem = Fplist_get (contact, QCparity);
  else
    tem = Fplist_get (p->childp, QCparity);
  if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
    error (":parity must be nil (no parity), `even', or `odd'");
#if defined (PARENB) && defined (PARODD) && defined (IGNPAR) && defined (INPCK)
  attr.c_cflag &= ~(PARENB | PARODD);
  attr.c_iflag &= ~(IGNPAR | INPCK);
  if (NILP (tem))
    {
      summary[1] = 'N';
    }
  else if (EQ (tem, Qeven))
    {
      summary[1] = 'E';
      attr.c_cflag |= PARENB;
      attr.c_iflag |= (IGNPAR | INPCK);
    }
  else if (EQ (tem, Qodd))
    {
      summary[1] = 'O';
      attr.c_cflag |= (PARENB | PARODD);
      attr.c_iflag |= (IGNPAR | INPCK);
    }
#else
  /* Don't error on no parity, which should be set by cfmakeraw.  */
  if (!NILP (tem))
    error ("Parity cannot be configured");
#endif
  childp2 = Fplist_put (childp2, QCparity, tem);

  /* Configure stopbits.  */
  if (!NILP (Fplist_member (contact, QCstopbits)))
    tem = Fplist_get (contact, QCstopbits);
  else
    tem = Fplist_get (p->childp, QCstopbits);
  if (NILP (tem))
    tem = make_number (1);
  CHECK_NUMBER (tem);
  if (XINT (tem) != 1 && XINT (tem) != 2)
    error (":stopbits must be nil (1 stopbit), 1, or 2");
  summary[2] = XINT (tem) + '0';
#if defined (CSTOPB)
  attr.c_cflag &= ~CSTOPB;
  if (XINT (tem) == 2)
    attr.c_cflag |= CSTOPB;
#else
  /* Don't error on 1 stopbit, which should be set by cfmakeraw.  */
  if (XINT (tem) != 1)
    error ("Stopbits cannot be configured");
#endif
  childp2 = Fplist_put (childp2, QCstopbits, tem);

  /* Configure flowcontrol.  */
  if (!NILP (Fplist_member (contact, QCflowcontrol)))
    tem = Fplist_get (contact, QCflowcontrol);
  else
    tem = Fplist_get (p->childp, QCflowcontrol);
  if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
    error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
#if defined (CRTSCTS)
  attr.c_cflag &= ~CRTSCTS;
#endif
#if defined (CNEW_RTSCTS)
  attr.c_cflag &= ~CNEW_RTSCTS;
#endif
#if defined (IXON) && defined (IXOFF)
  attr.c_iflag &= ~(IXON | IXOFF);
#endif
  if (NILP (tem))
    {
      /* Already configured.  */
    }
  else if (EQ (tem, Qhw))
    {
#if defined (CRTSCTS)
      attr.c_cflag |= CRTSCTS;
#elif defined (CNEW_RTSCTS)
      attr.c_cflag |= CNEW_RTSCTS;
#else
      error ("Hardware flowcontrol (RTS/CTS) not supported");
#endif
    }
  else if (EQ (tem, Qsw))
    {
#if defined (IXON) && defined (IXOFF)
      attr.c_iflag |= (IXON | IXOFF);
#else
      error ("Software flowcontrol (XON/XOFF) not supported");
#endif
    }
  childp2 = Fplist_put (childp2, QCflowcontrol, tem);

  /* Activate configuration.  */
  err = tcsetattr (p->outfd, TCSANOW, &attr);
  if (err != 0)
    report_file_error ("Failed tcsetattr", Qnil);

  childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
  pset_childp (p, childp2);
}
#endif /* not DOS_NT  */
\f
/* System depended enumeration of and access to system processes a-la ps(1).  */

#ifdef HAVE_PROCFS

/* Process enumeration and access via /proc.  */

Lisp_Object
list_system_processes (void)
{
  Lisp_Object procdir, match, proclist, next;
  struct gcpro gcpro1, gcpro2;
  register Lisp_Object tail;

  GCPRO2 (procdir, match);
  /* For every process on the system, there's a directory in the
     "/proc" pseudo-directory whose name is the numeric ID of that
     process.  */
  procdir = build_string ("/proc");
  match = build_string ("[0-9]+");
  proclist = directory_files_internal (procdir, Qnil, match, Qt, 0, Qnil);

  /* `proclist' gives process IDs as strings.  Destructively convert
     each string into a number.  */
  for (tail = proclist; CONSP (tail); tail = next)
    {
      next = XCDR (tail);
      XSETCAR (tail, Fstring_to_number (XCAR (tail), Qnil));
    }
  UNGCPRO;

  /* directory_files_internal returns the files in reverse order; undo
     that.  */
  proclist = Fnreverse (proclist);
  return proclist;
}

#elif defined DARWIN_OS || defined __FreeBSD__

Lisp_Object
list_system_processes (void)
{
#ifdef DARWIN_OS
  int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
#else
  int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PROC};
#endif
  size_t len;
  struct kinfo_proc *procs;
  size_t i;

  struct gcpro gcpro1;
  Lisp_Object proclist = Qnil;

  if (sysctl (mib, 3, NULL, &len, NULL, 0) != 0)
    return proclist;

  procs = xmalloc (len);
  if (sysctl (mib, 3, procs, &len, NULL, 0) != 0)
    {
      xfree (procs);
      return proclist;
    }

  GCPRO1 (proclist);
  len /= sizeof (struct kinfo_proc);
  for (i = 0; i < len; i++)
    {
#ifdef DARWIN_OS
      proclist = Fcons (make_fixnum_or_float (procs[i].kp_proc.p_pid), proclist);
#else
      proclist = Fcons (make_fixnum_or_float (procs[i].ki_pid), proclist);
#endif
    }
  UNGCPRO;

  xfree (procs);

  return  proclist;
}

/* The WINDOWSNT implementation is in w32.c.
   The MSDOS implementation is in dosfns.c.  */
#elif !defined (WINDOWSNT) && !defined (MSDOS)

Lisp_Object
list_system_processes (void)
{
  return Qnil;
}

#endif /* !defined (WINDOWSNT) */

#if defined GNU_LINUX && defined HAVE_LONG_LONG_INT
static struct timespec
time_from_jiffies (unsigned long long tval, long hz)
{
  unsigned long long s = tval / hz;
  unsigned long long frac = tval % hz;
  int ns;

  if (TYPE_MAXIMUM (time_t) < s)
    time_overflow ();
  if (LONG_MAX - 1 <= ULLONG_MAX / TIMESPEC_RESOLUTION
      || frac <= ULLONG_MAX / TIMESPEC_RESOLUTION)
    ns = frac * TIMESPEC_RESOLUTION / hz;
  else
    {
      /* This is reachable only in the unlikely case that HZ * HZ
	 exceeds ULLONG_MAX.  It calculates an approximation that is
	 guaranteed to be in range.  */
      long hz_per_ns = (hz / TIMESPEC_RESOLUTION
			+ (hz % TIMESPEC_RESOLUTION != 0));
      ns = frac / hz_per_ns;
    }

  return make_timespec (s, ns);
}

static Lisp_Object
ltime_from_jiffies (unsigned long long tval, long hz)
{
  struct timespec t = time_from_jiffies (tval, hz);
  return make_lisp_time (t);
}

static struct timespec
get_up_time (void)
{
  FILE *fup;
  struct timespec up = make_timespec (0, 0);

  block_input ();
  fup = emacs_fopen ("/proc/uptime", "r");

  if (fup)
    {
      unsigned long long upsec, upfrac, idlesec, idlefrac;
      int upfrac_start, upfrac_end, idlefrac_start, idlefrac_end;

      if (fscanf (fup, "%llu.%n%llu%n %llu.%n%llu%n",
		  &upsec, &upfrac_start, &upfrac, &upfrac_end,
		  &idlesec, &idlefrac_start, &idlefrac, &idlefrac_end)
	  == 4)
	{
	  if (TYPE_MAXIMUM (time_t) < upsec)
	    {
	      upsec = TYPE_MAXIMUM (time_t);
	      upfrac = TIMESPEC_RESOLUTION - 1;
	    }
	  else
	    {
	      int upfraclen = upfrac_end - upfrac_start;
	      for (; upfraclen < LOG10_TIMESPEC_RESOLUTION; upfraclen++)
		upfrac *= 10;
	      for (; LOG10_TIMESPEC_RESOLUTION < upfraclen; upfraclen--)
		upfrac /= 10;
	      upfrac = min (upfrac, TIMESPEC_RESOLUTION - 1);
	    }
	  up = make_timespec (upsec, upfrac);
	}
      fclose (fup);
    }
  unblock_input ();

  return up;
}

#define MAJOR(d) (((unsigned)(d) >> 8) & 0xfff)
#define MINOR(d) (((unsigned)(d) & 0xff) | (((unsigned)(d) & 0xfff00000) >> 12))

static Lisp_Object
procfs_ttyname (int rdev)
{
  FILE *fdev;
  char name[PATH_MAX];

  block_input ();
  fdev = emacs_fopen ("/proc/tty/drivers", "r");
  name[0] = 0;

  if (fdev)
    {
      unsigned major;
      unsigned long minor_beg, minor_end;
      char minor[25];	/* 2 32-bit numbers + dash */
      char *endp;

      for (; !feof (fdev) && !ferror (fdev); name[0] = 0)
	{
	  if (fscanf (fdev, "%*s %s %u %s %*s\n", name, &major, minor) >= 3
	      && major == MAJOR (rdev))
	    {
	      minor_beg = strtoul (minor, &endp, 0);
	      if (*endp == '\0')
		minor_end = minor_beg;
	      else if (*endp == '-')
		minor_end = strtoul (endp + 1, &endp, 0);
	      else
		continue;

	      if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
		{
		  sprintf (name + strlen (name), "%u", MINOR (rdev));
		  break;
		}
	    }
	}
      fclose (fdev);
    }
  unblock_input ();
  return build_string (name);
}

static uintmax_t
procfs_get_total_memory (void)
{
  FILE *fmem;
  uintmax_t retval = 2 * 1024 * 1024; /* default: 2 GiB */
  int c;

  block_input ();
  fmem = emacs_fopen ("/proc/meminfo", "r");

  if (fmem)
    {
      uintmax_t entry_value;
      bool done;

      do
	switch (fscanf (fmem, "MemTotal: %"SCNuMAX, &entry_value))
	  {
	  case 1:
	    retval = entry_value;
	    done = 1;
	    break;

	  case 0:
	    while ((c = getc (fmem)) != EOF && c != '\n')
	      continue;
	    done = c == EOF;
	    break;

	  default:
	    done = 1;
	    break;
	  }
      while (!done);

      fclose (fmem);
    }
  unblock_input ();
  return retval;
}

Lisp_Object
system_process_attributes (Lisp_Object pid)
{
  char procfn[PATH_MAX], fn[PATH_MAX];
  struct stat st;
  struct passwd *pw;
  struct group *gr;
  long clocks_per_sec;
  char *procfn_end;
  char procbuf[1025], *p, *q;
  int fd;
  ssize_t nread;
  static char const default_cmd[] = "???";
  const char *cmd = default_cmd;
  int cmdsize = sizeof default_cmd - 1;
  char *cmdline = NULL;
  ptrdiff_t cmdline_size;
  char c;
  printmax_t proc_id;
  int ppid, pgrp, sess, tty, tpgid, thcount;
  uid_t uid;
  gid_t gid;
  unsigned long long u_time, s_time, cutime, cstime, start;
  long priority, niceness, rss;
  unsigned long minflt, majflt, cminflt, cmajflt, vsize;
  struct timespec tnow, tstart, tboot, telapsed, us_time;
  double pcpu, pmem;
  Lisp_Object attrs = Qnil;
  Lisp_Object cmd_str, decoded_cmd;
  ptrdiff_t count;
  struct gcpro gcpro1, gcpro2;

  CHECK_NUMBER_OR_FLOAT (pid);
  CONS_TO_INTEGER (pid, pid_t, proc_id);
  sprintf (procfn, "/proc/%"pMd, proc_id);
  if (stat (procfn, &st) < 0)
    return attrs;

  GCPRO2 (attrs, decoded_cmd);

  /* euid egid */
  uid = st.st_uid;
  attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
  block_input ();
  pw = getpwuid (uid);
  unblock_input ();
  if (pw)
    attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);

  gid = st.st_gid;
  attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
  block_input ();
  gr = getgrgid (gid);
  unblock_input ();
  if (gr)
    attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);

  count = SPECPDL_INDEX ();
  strcpy (fn, procfn);
  procfn_end = fn + strlen (fn);
  strcpy (procfn_end, "/stat");
  fd = emacs_open (fn, O_RDONLY, 0);
  if (fd < 0)
    nread = 0;
  else
    {
      record_unwind_protect_int (close_file_unwind, fd);
      nread = emacs_read (fd, procbuf, sizeof procbuf - 1);
    }
  if (0 < nread)
    {
      procbuf[nread] = '\0';
      p = procbuf;

      p = strchr (p, '(');
      if (p != NULL)
	{
	  q = strrchr (p + 1, ')');
	  /* comm */
	  if (q != NULL)
	    {
	      cmd = p + 1;
	      cmdsize = q - cmd;
	    }
	}
      else
	q = NULL;
      /* Command name is encoded in locale-coding-system; decode it.  */
      cmd_str = make_unibyte_string (cmd, cmdsize);
      decoded_cmd = code_convert_string_norecord (cmd_str,
						  Vlocale_coding_system, 0);
      attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);

      /* state ppid pgrp sess tty tpgid . minflt cminflt majflt cmajflt
	 utime stime cutime cstime priority nice thcount . start vsize rss */
      if (q
	  && (sscanf (q + 2, ("%c %d %d %d %d %d %*u %lu %lu %lu %lu "
			      "%Lu %Lu %Lu %Lu %ld %ld %d %*d %Lu %lu %ld"),
		      &c, &ppid, &pgrp, &sess, &tty, &tpgid,
		      &minflt, &cminflt, &majflt, &cmajflt,
		      &u_time, &s_time, &cutime, &cstime,
		      &priority, &niceness, &thcount, &start, &vsize, &rss)
	      == 20))
	{
	  char state_str[2];
	  state_str[0] = c;
	  state_str[1] = '\0';
	  attrs = Fcons (Fcons (Qstate, build_string (state_str)), attrs);
	  attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (ppid)), attrs);
	  attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pgrp)), attrs);
	  attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (sess)), attrs);
	  attrs = Fcons (Fcons (Qttname, procfs_ttyname (tty)), attrs);
	  attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (tpgid)), attrs);
	  attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (minflt)), attrs);
	  attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (majflt)), attrs);
	  attrs = Fcons (Fcons (Qcminflt, make_fixnum_or_float (cminflt)),
			 attrs);
	  attrs = Fcons (Fcons (Qcmajflt, make_fixnum_or_float (cmajflt)),
			 attrs);
	  clocks_per_sec = sysconf (_SC_CLK_TCK);
	  if (clocks_per_sec < 0)
	    clocks_per_sec = 100;
	  attrs = Fcons (Fcons (Qutime,
				ltime_from_jiffies (u_time, clocks_per_sec)),
			 attrs);
	  attrs = Fcons (Fcons (Qstime,
				ltime_from_jiffies (s_time, clocks_per_sec)),
			 attrs);
	  attrs = Fcons (Fcons (Qtime,
				ltime_from_jiffies (s_time + u_time,
						    clocks_per_sec)),
			 attrs);
	  attrs = Fcons (Fcons (Qcutime,
				ltime_from_jiffies (cutime, clocks_per_sec)),
			 attrs);
	  attrs = Fcons (Fcons (Qcstime,
				ltime_from_jiffies (cstime, clocks_per_sec)),
			 attrs);
	  attrs = Fcons (Fcons (Qctime,
				ltime_from_jiffies (cstime + cutime,
						    clocks_per_sec)),
			 attrs);
	  attrs = Fcons (Fcons (Qpri, make_number (priority)), attrs);
	  attrs = Fcons (Fcons (Qnice, make_number (niceness)), attrs);
	  attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (thcount)),
			 attrs);
	  tnow = current_timespec ();
	  telapsed = get_up_time ();
	  tboot = timespec_sub (tnow, telapsed);
	  tstart = time_from_jiffies (start, clocks_per_sec);
	  tstart = timespec_add (tboot, tstart);
	  attrs = Fcons (Fcons (Qstart, make_lisp_time (tstart)), attrs);
	  attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (vsize / 1024)),
			 attrs);
	  attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (4 * rss)), attrs);
	  telapsed = timespec_sub (tnow, tstart);
	  attrs = Fcons (Fcons (Qetime, make_lisp_time (telapsed)), attrs);
	  us_time = time_from_jiffies (u_time + s_time, clocks_per_sec);
	  pcpu = timespectod (us_time) / timespectod (telapsed);
	  if (pcpu > 1.0)
	    pcpu = 1.0;
	  attrs = Fcons (Fcons (Qpcpu, make_float (100 * pcpu)), attrs);
	  pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
	  if (pmem > 100)
	    pmem = 100;
	  attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
	}
    }
  unbind_to (count, Qnil);

  /* args */
  strcpy (procfn_end, "/cmdline");
  fd = emacs_open (fn, O_RDONLY, 0);
  if (fd >= 0)
    {
      ptrdiff_t readsize, nread_incr;
      record_unwind_protect_int (close_file_unwind, fd);
      record_unwind_protect_nothing ();
      nread = cmdline_size = 0;

      do
	{
	  cmdline = xpalloc (cmdline, &cmdline_size, 2, STRING_BYTES_BOUND, 1);
	  set_unwind_protect_ptr (count + 1, xfree, cmdline);

	  /* Leave room even if every byte needs escaping below.  */
	  readsize = (cmdline_size >> 1) - nread;

	  nread_incr = emacs_read (fd, cmdline + nread, readsize);
	  nread += max (0, nread_incr);
	}
      while (nread_incr == readsize);

      if (nread)
	{
	  /* We don't want trailing null characters.  */
	  for (p = cmdline + nread; cmdline < p && !p[-1]; p--)
	    continue;

	  /* Escape-quote whitespace and backslashes.  */
	  q = cmdline + cmdline_size;
	  while (cmdline < p)
	    {
	      char c = *--p;
	      *--q = c ? c : ' ';
	      if (c_isspace (c) || c == '\\')
		*--q = '\\';
	    }

	  nread = cmdline + cmdline_size - q;
	}

      if (!nread)
	{
	  nread = cmdsize + 2;
	  cmdline_size = nread + 1;
	  q = cmdline = xrealloc (cmdline, cmdline_size);
	  set_unwind_protect_ptr (count + 1, xfree, cmdline);
	  sprintf (cmdline, "[%.*s]", cmdsize, cmd);
	}
      /* Command line is encoded in locale-coding-system; decode it.  */
      cmd_str = make_unibyte_string (q, nread);
      decoded_cmd = code_convert_string_norecord (cmd_str,
						  Vlocale_coding_system, 0);
      unbind_to (count, Qnil);
      attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
    }

  UNGCPRO;
  return attrs;
}

#elif defined (SOLARIS2) && defined (HAVE_PROCFS)

/* The <procfs.h> header does not like to be included if _LP64 is defined and
   __FILE_OFFSET_BITS == 64.  This is an ugly workaround that.  */
#if !defined (_LP64) && defined (_FILE_OFFSET_BITS) &&  (_FILE_OFFSET_BITS  ==  64)
#define PROCFS_FILE_OFFSET_BITS_HACK 1
#undef _FILE_OFFSET_BITS
#else
#define PROCFS_FILE_OFFSET_BITS_HACK 0
#endif

#include <procfs.h>

#if PROCFS_FILE_OFFSET_BITS_HACK ==  1
#define _FILE_OFFSET_BITS 64
#ifdef _FILE_OFFSET_BITS /* Avoid unused-macro warnings.  */
#endif
#endif /* PROCFS_FILE_OFFSET_BITS_HACK ==  1 */

Lisp_Object
system_process_attributes (Lisp_Object pid)
{
  char procfn[PATH_MAX], fn[PATH_MAX];
  struct stat st;
  struct passwd *pw;
  struct group *gr;
  char *procfn_end;
  struct psinfo pinfo;
  int fd;
  ssize_t nread;
  printmax_t proc_id;
  uid_t uid;
  gid_t gid;
  Lisp_Object attrs = Qnil;
  Lisp_Object decoded_cmd;
  struct gcpro gcpro1, gcpro2;
  ptrdiff_t count;

  CHECK_NUMBER_OR_FLOAT (pid);
  CONS_TO_INTEGER (pid, pid_t, proc_id);
  sprintf (procfn, "/proc/%"pMd, proc_id);
  if (stat (procfn, &st) < 0)
    return attrs;

  GCPRO2 (attrs, decoded_cmd);

  /* euid egid */
  uid = st.st_uid;
  attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
  block_input ();
  pw = getpwuid (uid);
  unblock_input ();
  if (pw)
    attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);

  gid = st.st_gid;
  attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
  block_input ();
  gr = getgrgid (gid);
  unblock_input ();
  if (gr)
    attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);

  count = SPECPDL_INDEX ();
  strcpy (fn, procfn);
  procfn_end = fn + strlen (fn);
  strcpy (procfn_end, "/psinfo");
  fd = emacs_open (fn, O_RDONLY, 0);
  if (fd < 0)
    nread = 0;
  else
    {
      record_unwind_protect (close_file_unwind, fd);
      nread = emacs_read (fd, &pinfo, sizeof pinfo);
    }

  if (nread == sizeof pinfo)
    {
      attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (pinfo.pr_ppid)), attrs);
      attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pinfo.pr_pgid)), attrs);
      attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (pinfo.pr_sid)), attrs);

      {
	char state_str[2];
	state_str[0] = pinfo.pr_lwp.pr_sname;
	state_str[1] = '\0';
	attrs = Fcons (Fcons (Qstate, build_string (state_str)), attrs);
      }

      /* FIXME: missing Qttyname. psinfo.pr_ttydev is a dev_t,
	 need to get a string from it. */

      /* FIXME: missing: Qtpgid */

      /* FIXME: missing:
	    Qminflt
	    Qmajflt
	    Qcminflt
	    Qcmajflt

	    Qutime
	    Qcutime
	    Qstime
	    Qcstime
	    Are they available? */

      attrs = Fcons (Fcons (Qtime, make_lisp_time (pinfo.pr_time)), attrs);
      attrs = Fcons (Fcons (Qctime, make_lisp_time (pinfo.pr_ctime)), attrs);
      attrs = Fcons (Fcons (Qpri, make_number (pinfo.pr_lwp.pr_pri)), attrs);
      attrs = Fcons (Fcons (Qnice, make_number (pinfo.pr_lwp.pr_nice)), attrs);
      attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (pinfo.pr_nlwp)),
		     attrs);

      attrs = Fcons (Fcons (Qstart, make_lisp_time (pinfo.pr_start)), attrs);
      attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (pinfo.pr_size)),
		     attrs);
      attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (pinfo.pr_rssize)),
		     attrs);

      /* pr_pctcpu and pr_pctmem are unsigned integers in the
	 range 0 .. 2**15, representing 0.0 .. 1.0.  */
      attrs = Fcons (Fcons (Qpcpu,
			    make_float (100.0 / 0x8000 * pinfo.pr_pctcpu)),
		     attrs);
      attrs = Fcons (Fcons (Qpmem,
			    make_float (100.0 / 0x8000 * pinfo.pr_pctmem)),
		     attrs);

      decoded_cmd = (code_convert_string_norecord
		     (build_unibyte_string (pinfo.pr_fname),
		      Vlocale_coding_system, 0));
      attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
      decoded_cmd = (code_convert_string_norecord
		     (build_unibyte_string (pinfo.pr_psargs),
		      Vlocale_coding_system, 0));
      attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
    }
  unbind_to (count, Qnil);
  UNGCPRO;
  return attrs;
}

#elif defined __FreeBSD__

static struct timespec
timeval_to_timespec (struct timeval t)
{
  return make_timespec (t.tv_sec, t.tv_usec * 1000);
}

static Lisp_Object
make_lisp_timeval (struct timeval t)
{
  return make_lisp_time (timeval_to_timespec (t));
}

Lisp_Object
system_process_attributes (Lisp_Object pid)
{
  int proc_id;
  int pagesize = getpagesize ();
  unsigned long npages;
  int fscale;
  struct passwd *pw;
  struct group  *gr;
  char *ttyname;
  size_t len;
  char args[MAXPATHLEN];
  struct timespec t, now;

  int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID};
  struct kinfo_proc proc;
  size_t proclen = sizeof proc;

  struct gcpro gcpro1, gcpro2;
  Lisp_Object attrs = Qnil;
  Lisp_Object decoded_comm;

  CHECK_NUMBER_OR_FLOAT (pid);
  CONS_TO_INTEGER (pid, int, proc_id);
  mib[3] = proc_id;

  if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0)
    return attrs;

  GCPRO2 (attrs, decoded_comm);

  attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (proc.ki_uid)), attrs);

  block_input ();
  pw = getpwuid (proc.ki_uid);
  unblock_input ();
  if (pw)
    attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);

  attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (proc.ki_svgid)), attrs);

  block_input ();
  gr = getgrgid (proc.ki_svgid);
  unblock_input ();
  if (gr)
    attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);

  decoded_comm = (code_convert_string_norecord
		  (build_unibyte_string (proc.ki_comm),
		   Vlocale_coding_system, 0));

  attrs = Fcons (Fcons (Qcomm, decoded_comm), attrs);
  {
    char state[2] = {'\0', '\0'};
    switch (proc.ki_stat)
      {
      case SRUN:
	state[0] = 'R';
	break;

      case SSLEEP:
	state[0] = 'S';
	break;

      case SLOCK:
	state[0] = 'D';
	break;

      case SZOMB:
	state[0] = 'Z';
	break;

      case SSTOP:
	state[0] = 'T';
	break;
      }
    attrs = Fcons (Fcons (Qstate, build_string (state)), attrs);
  }

  attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (proc.ki_ppid)), attrs);
  attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (proc.ki_pgid)), attrs);
  attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (proc.ki_sid)),  attrs);

  block_input ();
  ttyname = proc.ki_tdev == NODEV ? NULL : devname (proc.ki_tdev, S_IFCHR);
  unblock_input ();
  if (ttyname)
    attrs = Fcons (Fcons (Qtty, build_string (ttyname)), attrs);

  attrs = Fcons (Fcons (Qtpgid,   make_fixnum_or_float (proc.ki_tpgid)), attrs);
  attrs = Fcons (Fcons (Qminflt,  make_fixnum_or_float (proc.ki_rusage.ru_minflt)), attrs);
  attrs = Fcons (Fcons (Qmajflt,  make_fixnum_or_float (proc.ki_rusage.ru_majflt)), attrs);
  attrs = Fcons (Fcons (Qcminflt, make_number (proc.ki_rusage_ch.ru_minflt)), attrs);
  attrs = Fcons (Fcons (Qcmajflt, make_number (proc.ki_rusage_ch.ru_majflt)), attrs);

  attrs = Fcons (Fcons (Qutime, make_lisp_timeval (proc.ki_rusage.ru_utime)),
		 attrs);
  attrs = Fcons (Fcons (Qstime, make_lisp_timeval (proc.ki_rusage.ru_stime)),
		 attrs);
  t = timespec_add (timeval_to_timespec (proc.ki_rusage.ru_utime),
		    timeval_to_timespec (proc.ki_rusage.ru_stime));
  attrs = Fcons (Fcons (Qtime, make_lisp_time (t)), attrs);

  attrs = Fcons (Fcons (Qcutime,
			make_lisp_timeval (proc.ki_rusage_ch.ru_utime)),
		 attrs);
  attrs = Fcons (Fcons (Qcstime,
			make_lisp_timeval (proc.ki_rusage_ch.ru_utime)),
		 attrs);
  t = timespec_add (timeval_to_timespec (proc.ki_rusage_ch.ru_utime),
		    timeval_to_timespec (proc.ki_rusage_ch.ru_stime));
  attrs = Fcons (Fcons (Qctime, make_lisp_time (t)), attrs);

  attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (proc.ki_numthreads)),
		 attrs);
  attrs = Fcons (Fcons (Qpri,   make_number (proc.ki_pri.pri_native)), attrs);
  attrs = Fcons (Fcons (Qnice,  make_number (proc.ki_nice)), attrs);
  attrs = Fcons (Fcons (Qstart, make_lisp_timeval (proc.ki_start)), attrs);
  attrs = Fcons (Fcons (Qvsize, make_number (proc.ki_size >> 10)), attrs);
  attrs = Fcons (Fcons (Qrss,   make_number (proc.ki_rssize * pagesize >> 10)),
		 attrs);

  now = current_timespec ();
  t = timespec_sub (now, timeval_to_timespec (proc.ki_start));
  attrs = Fcons (Fcons (Qetime, make_lisp_time (t)), attrs);

  len = sizeof fscale;
  if (sysctlbyname ("kern.fscale", &fscale, &len, NULL, 0) == 0)
    {
      double pcpu;
      fixpt_t ccpu;
      len = sizeof ccpu;
      if (sysctlbyname ("kern.ccpu", &ccpu, &len, NULL, 0) == 0)
      	{
      	  pcpu = (100.0 * proc.ki_pctcpu / fscale
		  / (1 - exp (proc.ki_swtime * log ((double) ccpu / fscale))));
  	  attrs = Fcons (Fcons (Qpcpu, make_fixnum_or_float (pcpu)), attrs);
      	}
    }

  len = sizeof npages;
  if (sysctlbyname ("hw.availpages", &npages, &len, NULL, 0) == 0)
    {
      double pmem = (proc.ki_flag & P_INMEM
		     ? 100.0 * proc.ki_rssize / npages
		     : 0);
      attrs = Fcons (Fcons (Qpmem, make_fixnum_or_float (pmem)), attrs);
    }

  mib[2] = KERN_PROC_ARGS;
  len = MAXPATHLEN;
  if (sysctl (mib, 4, args, &len, NULL, 0) == 0)
    {
      int i;
      for (i = 0; i < len; i++)
	{
	  if (! args[i] && i < len - 1)
	    args[i] = ' ';
	}

      decoded_comm =
	(code_convert_string_norecord
	 (build_unibyte_string (args),
	  Vlocale_coding_system, 0));

      attrs = Fcons (Fcons (Qargs, decoded_comm), attrs);
    }

  UNGCPRO;
  return attrs;
}

/* The WINDOWSNT implementation is in w32.c.
   The MSDOS implementation is in dosfns.c.  */
#elif !defined (WINDOWSNT) && !defined (MSDOS)

Lisp_Object
system_process_attributes (Lisp_Object pid)
{
  return Qnil;
}

#endif	/* !defined (WINDOWSNT) */
\f
/* Wide character string collation.  */

#ifdef __STDC_ISO_10646__
# include <wchar.h>
# include <wctype.h>

# if defined HAVE_NEWLOCALE || defined HAVE_SETLOCALE
#  include <locale.h>
# endif
# ifndef LC_COLLATE
#  define LC_COLLATE 0
# endif
# ifndef LC_COLLATE_MASK
#  define LC_COLLATE_MASK 0
# endif
# ifndef LC_CTYPE
#  define LC_CTYPE 0
# endif
# ifndef LC_CTYPE_MASK
#  define LC_CTYPE_MASK 0
# endif

# ifndef HAVE_NEWLOCALE
#  undef freelocale
#  undef locale_t
#  undef newlocale
#  undef wcscoll_l
#  undef towlower_l
#  define freelocale emacs_freelocale
#  define locale_t emacs_locale_t
#  define newlocale emacs_newlocale
#  define wcscoll_l emacs_wcscoll_l
#  define towlower_l emacs_towlower_l

typedef char const *locale_t;

static locale_t
newlocale (int category_mask, char const *locale, locale_t loc)
{
  return locale;
}

static void
freelocale (locale_t loc)
{
}

static char *
emacs_setlocale (int category, char const *locale)
{
#  ifdef HAVE_SETLOCALE
  errno = 0;
  char *loc = setlocale (category, locale);
  if (loc || errno)
    return loc;
  errno = EINVAL;
#  else
  errno = ENOTSUP;
#  endif
  return 0;
}

static int
wcscoll_l (wchar_t const *a, wchar_t const *b, locale_t loc)
{
  int result = 0;
  char *oldloc = emacs_setlocale (LC_COLLATE, NULL);
  int err;

  if (! oldloc)
    err = errno;
  else
    {
      USE_SAFE_ALLOCA;
      char *oldcopy = SAFE_ALLOCA (strlen (oldloc) + 1);
      strcpy (oldcopy, oldloc);
      if (! emacs_setlocale (LC_COLLATE, loc))
	err = errno;
      else
	{
	  errno = 0;
	  result = wcscoll (a, b);
	  err = errno;
	  if (! emacs_setlocale (LC_COLLATE, oldcopy))
	    err = errno;
	}
      SAFE_FREE ();
    }

  errno = err;
  return result;
}

static wint_t
towlower_l (wint_t wc, locale_t loc)
{
  wint_t result = wc;
  char *oldloc = emacs_setlocale (LC_CTYPE, NULL);

  if (oldloc)
    {
      USE_SAFE_ALLOCA;
      char *oldcopy = SAFE_ALLOCA (strlen (oldloc) + 1);
      strcpy (oldcopy, oldloc);
      if (emacs_setlocale (LC_CTYPE, loc))
	{
	  result = towlower (wc);
	  emacs_setlocale (LC_COLLATE, oldcopy);
	}
      SAFE_FREE ();
    }

  return result;
}
# endif

int
str_collate (Lisp_Object s1, Lisp_Object s2,
	     Lisp_Object locale, Lisp_Object ignore_case)
{
  int res, err;
  ptrdiff_t len, i, i_byte;
  wchar_t *p1, *p2;

  USE_SAFE_ALLOCA;

  /* Convert byte stream to code points.  */
  len = SCHARS (s1); i = i_byte = 0;
  SAFE_NALLOCA (p1, 1, len + 1);
  while (i < len)
    FETCH_STRING_CHAR_ADVANCE (*(p1+i-1), s1, i, i_byte);
  *(p1+len) = 0;

  len = SCHARS (s2); i = i_byte = 0;
  SAFE_NALLOCA (p2, 1, len + 1);
  while (i < len)
    FETCH_STRING_CHAR_ADVANCE (*(p2+i-1), s2, i, i_byte);
  *(p2+len) = 0;

  if (STRINGP (locale))
    {
      locale_t loc = newlocale (LC_COLLATE_MASK | LC_CTYPE_MASK,
				SSDATA (locale), 0);
      if (!loc)
	error ("Invalid locale %s: %s", SSDATA (locale), strerror (errno));

      if (! NILP (ignore_case))
	for (int i = 1; i < 3; i++)
	  {
	    wchar_t *p = (i == 1) ? p1 : p2;
	    for (; *p; p++)
	      *p = towlower_l (*p, loc);
	  }

      errno = 0;
      res = wcscoll_l (p1, p2, loc);
      err = errno;
      freelocale (loc);
    }
  else
    {
      if (! NILP (ignore_case))
	for (int i = 1; i < 3; i++)
	  {
	    wchar_t *p = (i == 1) ? p1 : p2;
	    for (; *p; p++)
	      *p = towlower (*p);
	  }

      errno = 0;
      res = wcscoll (p1, p2);
      err = errno;
    }
#  ifndef HAVE_NEWLOCALE
  if (err)
    error ("Invalid locale or string for collation: %s", strerror (err));
#  else
  if (err)
    error ("Invalid string for collation: %s", strerror (err));
#  endif

  SAFE_FREE ();
  return res;
}
#endif  /* __STDC_ISO_10646__ */

#ifdef WINDOWSNT
int
str_collate (Lisp_Object s1, Lisp_Object s2,
	     Lisp_Object locale, Lisp_Object ignore_case)
{

  char *loc = STRINGP (locale) ? SSDATA (locale) : NULL;
  int res, err = errno;

  errno = 0;
  res = w32_compare_strings (SDATA (s1), SDATA (s2), loc, !NILP (ignore_case));
  if (errno)
    error ("Invalid string for collation: %s", strerror (errno));

  errno = err;
  return res;
}
#endif	/* WINDOWSNT */

debug log:

solving 3281a07 ...
found 3281a07 in https://yhetil.org/emacs/877ftno4fr.fsf-ueno@gnu.org/
found 0a0b0ac in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 0a0b0ac01d006107972c63f8993e3bacb2c0b7dc	src/sysdep.c

applying [1/1] https://yhetil.org/emacs/877ftno4fr.fsf-ueno@gnu.org/
diff --git a/src/sysdep.c b/src/sysdep.c
index 0a0b0ac..3281a07 100644

Checking patch src/sysdep.c...
Applied patch src/sysdep.c cleanly.

index at:
100644 3281a07b8d88f7e41747b27668e2e25a968199de	src/sysdep.c

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.