* bug#13070: Use putenv+unsetenv instead of modifying environ directly
@ 2012-12-03 20:32 Paul Eggert
2012-12-04 13:51 ` Fabrice Popineau
0 siblings, 1 reply; 8+ messages in thread
From: Paul Eggert @ 2012-12-03 20:32 UTC (permalink / raw)
To: 13070; +Cc: Fabrice Popineau
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Tags: patch
The attached patch is in response to last week's thread on emacs-devel
<http://lists.gnu.org/archive/html/emacs-devel/2012-11/msg00514.html>.
It's relative to trunk bzr 111078. Tested on Fedora 17. I don't see
any issues related to the Microsoft port but I'm CC:ing this to Eli
and Fabrice just in case, as the original bug seems to be Windows-related.
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=== modified file 'ChangeLog'
--- ChangeLog 2012-11-30 18:25:59 +0000
+++ ChangeLog 2012-12-03 20:03:22 +0000
@@ -1,3 +1,11 @@
+2012-12-03 Paul Eggert <eggert@cs.ucla.edu>
+
+ Use putenv+unsetenv instead of modifying environ directly.
+ * lib/putenv.c, lib/unsetenv.c, m4/putenv.m4, m4/setenv.m4:
+ New files, copied automatically from gnulib.
+ * lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
+ * merge-gnulib (GNULIB_MODULES): Add putenv, unsetenv.
+
2012-11-30 Paul Eggert <eggert@cs.ucla.edu>
Merge from gnulib for 'inline' (Bug#13040), incorporating:
=== modified file 'admin/ChangeLog'
--- admin/ChangeLog 2012-11-24 17:20:49 +0000
+++ admin/ChangeLog 2012-12-03 20:03:22 +0000
@@ -1,3 +1,8 @@
+2012-12-03 Paul Eggert <eggert@cs.ucla.edu>
+
+ Use putenv+unsetenv instead of modifying environ directly.
+ * merge-gnulib (GNULIB_MODULES): Add putenv, unsetenv.
+
2012-11-24 Ken Brown <kbrown@cornell.edu>
* CPP-DEFINES (HAVE_MOUSE): Remove.
=== modified file 'admin/merge-gnulib'
--- admin/merge-gnulib 2012-11-17 22:12:47 +0000
+++ admin/merge-gnulib 2012-12-03 20:03:22 +0000
@@ -31,10 +31,10 @@
dtoastr dtotimespec dup2 environ execinfo faccessat
fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday
ignore-value intprops largefile lstat
- manywarnings mktime pselect pthread_sigmask readlink
+ manywarnings mktime pselect pthread_sigmask putenv readlink
socklen stat-time stdalign stdarg stdbool stdio
strftime strtoimax strtoumax symlink sys_stat
- sys_time time timer-time timespec-add timespec-sub utimens
+ sys_time time timer-time timespec-add timespec-sub unsetenv utimens
warnings
'
=== modified file 'lib/gnulib.mk'
--- lib/gnulib.mk 2012-11-30 18:25:59 +0000
+++ lib/gnulib.mk 2012-12-03 20:03:22 +0000
@@ -21,7 +21,7 @@
# the same distribution terms as the rest of that program.
#
# Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=at-internal --avoid=errno --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=openat-h --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings mktime pselect pthread_sigmask readlink socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub utimens warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=at-internal --avoid=errno --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=openat-h --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings mktime pselect pthread_sigmask putenv readlink socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
MOSTLYCLEANFILES += core *.stackdump
@@ -439,6 +439,15 @@
## end gnulib module pthread_sigmask
+## begin gnulib module putenv
+
+
+EXTRA_DIST += putenv.c
+
+EXTRA_libgnu_a_SOURCES += putenv.c
+
+## end gnulib module putenv
+
## begin gnulib module readlink
@@ -1400,6 +1409,15 @@
## end gnulib module unistd
+## begin gnulib module unsetenv
+
+
+EXTRA_DIST += unsetenv.c
+
+EXTRA_libgnu_a_SOURCES += unsetenv.c
+
+## end gnulib module unsetenv
+
## begin gnulib module utimens
libgnu_a_SOURCES += utimens.c
=== added file 'lib/putenv.c'
--- lib/putenv.c 1970-01-01 00:00:00 +0000
+++ lib/putenv.c 2012-12-03 20:03:22 +0000
@@ -0,0 +1,134 @@
+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2012 Free Software
+ Foundation, Inc.
+
+ NOTE: The canonical source of this file is maintained with the GNU C
+ Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+ This program 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 any
+ later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <stdlib.h>
+
+#include <stddef.h>
+
+/* Include errno.h *after* sys/types.h to work around header problems
+ on AIX 3.2.5. */
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(ev) ((errno) = (ev))
+#endif
+
+#include <string.h>
+#include <unistd.h>
+
+#if _LIBC
+# if HAVE_GNU_LD
+# define environ __environ
+# else
+extern char **environ;
+# endif
+#endif
+
+#if _LIBC
+/* This lock protects against simultaneous modifications of 'environ'. */
+# include <bits/libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+static int
+_unsetenv (const char *name)
+{
+ size_t len;
+ char **ep;
+
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+ LOCK;
+
+ ep = environ;
+ while (*ep != NULL)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+ else
+ ++ep;
+
+ UNLOCK;
+
+ return 0;
+}
+
+
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.
+ If STRING contains no '=', then remove STRING from the environment. */
+int
+putenv (char *string)
+{
+ const char *const name_end = strchr (string, '=');
+ register size_t size;
+ register char **ep;
+
+ if (name_end == NULL)
+ {
+ /* Remove the variable from the environment. */
+ return _unsetenv (string);
+ }
+
+ size = 0;
+ for (ep = environ; *ep != NULL; ++ep)
+ if (!strncmp (*ep, string, name_end - string) &&
+ (*ep)[name_end - string] == '=')
+ break;
+ else
+ ++size;
+
+ if (*ep == NULL)
+ {
+ static char **last_environ = NULL;
+ char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
+ if (new_environ == NULL)
+ return -1;
+ (void) memcpy ((void *) new_environ, (void *) environ,
+ size * sizeof (char *));
+ new_environ[size] = (char *) string;
+ new_environ[size + 1] = NULL;
+ free (last_environ);
+ last_environ = new_environ;
+ environ = new_environ;
+ }
+ else
+ *ep = string;
+
+ return 0;
+}
=== added file 'lib/unsetenv.c'
--- lib/unsetenv.c 1970-01-01 00:00:00 +0000
+++ lib/unsetenv.c 2012-12-03 20:03:22 +0000
@@ -0,0 +1,127 @@
+/* Copyright (C) 1992, 1995-2002, 2005-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ This program 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.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
+ optimizes away the name == NULL test below. */
+#define _GL_ARG_NONNULL(params)
+
+/* Specification. */
+#include <stdlib.h>
+
+#include <errno.h>
+#if !_LIBC
+# define __set_errno(ev) ((errno) = (ev))
+#endif
+
+#include <string.h>
+#include <unistd.h>
+
+#if !_LIBC
+# define __environ environ
+#endif
+
+#if _LIBC
+/* This lock protects against simultaneous modifications of 'environ'. */
+# include <bits/libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+/* In the GNU C library we must keep the namespace clean. */
+#ifdef _LIBC
+# define unsetenv __unsetenv
+#endif
+
+#if _LIBC || !HAVE_UNSETENV
+
+int
+unsetenv (const char *name)
+{
+ size_t len;
+ char **ep;
+
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+ LOCK;
+
+ ep = __environ;
+ while (*ep != NULL)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+ else
+ ++ep;
+
+ UNLOCK;
+
+ return 0;
+}
+
+#ifdef _LIBC
+# undef unsetenv
+weak_alias (__unsetenv, unsetenv)
+#endif
+
+#else /* HAVE_UNSETENV */
+
+# undef unsetenv
+# if !HAVE_DECL_UNSETENV
+# if VOID_UNSETENV
+extern void unsetenv (const char *);
+# else
+extern int unsetenv (const char *);
+# endif
+# endif
+
+/* Call the underlying unsetenv, in case there is hidden bookkeeping
+ that needs updating beyond just modifying environ. */
+int
+rpl_unsetenv (const char *name)
+{
+ int result = 0;
+ if (!name || !*name || strchr (name, '='))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ while (getenv (name))
+# if !VOID_UNSETENV
+ result =
+# endif
+ unsetenv (name);
+ return result;
+}
+
+#endif /* HAVE_UNSETENV */
=== modified file 'm4/gnulib-comp.m4'
--- m4/gnulib-comp.m4 2012-11-30 18:25:59 +0000
+++ m4/gnulib-comp.m4 2012-12-03 20:03:22 +0000
@@ -85,6 +85,7 @@
# Code from module pathmax:
# Code from module pselect:
# Code from module pthread_sigmask:
+ # Code from module putenv:
# Code from module readlink:
# Code from module root-uid:
# Code from module signal-h:
@@ -125,6 +126,7 @@
# Code from module timespec-sub:
# Code from module u64:
# Code from module unistd:
+ # Code from module unsetenv:
# Code from module utimens:
# Code from module verify:
# Code from module warnings:
@@ -239,6 +241,11 @@
gl_PREREQ_PTHREAD_SIGMASK
fi
gl_SIGNAL_MODULE_INDICATOR([pthread_sigmask])
+ gl_FUNC_PUTENV
+ if test $REPLACE_PUTENV = 1; then
+ AC_LIBOBJ([putenv])
+ fi
+ gl_STDLIB_MODULE_INDICATOR([putenv])
gl_FUNC_READLINK
if test $HAVE_READLINK = 0 || test $REPLACE_READLINK = 1; then
AC_LIBOBJ([readlink])
@@ -291,6 +298,12 @@
gl_TIMER_TIME
gl_TIMESPEC
gl_UNISTD_H
+ gl_FUNC_UNSETENV
+ if test $HAVE_UNSETENV = 0 || test $REPLACE_UNSETENV = 1; then
+ AC_LIBOBJ([unsetenv])
+ gl_PREREQ_UNSETENV
+ fi
+ gl_STDLIB_MODULE_INDICATOR([unsetenv])
gl_UTIMENS
gl_gnulib_enabled_dosname=false
gl_gnulib_enabled_euidaccess=false
@@ -673,6 +686,7 @@
lib/pathmax.h
lib/pselect.c
lib/pthread_sigmask.c
+ lib/putenv.c
lib/readlink.c
lib/root-uid.h
lib/sha1.c
@@ -715,6 +729,7 @@
lib/u64.h
lib/unistd.c
lib/unistd.in.h
+ lib/unsetenv.c
lib/utimens.c
lib/utimens.h
lib/verify.h
@@ -756,7 +771,9 @@
m4/pathmax.m4
m4/pselect.m4
m4/pthread_sigmask.m4
+ m4/putenv.m4
m4/readlink.m4
+ m4/setenv.m4
m4/sha1.m4
m4/sha256.m4
m4/sha512.m4
=== added file 'm4/putenv.m4'
--- m4/putenv.m4 1970-01-01 00:00:00 +0000
+++ m4/putenv.m4 2012-12-03 20:03:22 +0000
@@ -0,0 +1,50 @@
+# putenv.m4 serial 19
+dnl Copyright (C) 2002-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Jim Meyering.
+dnl
+dnl Check whether putenv ("FOO") removes FOO from the environment.
+dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.
+
+AC_DEFUN([gl_FUNC_PUTENV],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
+ [gl_cv_func_svid_putenv],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
+ /* Put it in env. */
+ if (putenv ("CONFTEST_putenv=val"))
+ return 1;
+
+ /* Try to remove it. */
+ if (putenv ("CONFTEST_putenv"))
+ return 2;
+
+ /* Make sure it was deleted. */
+ if (getenv ("CONFTEST_putenv") != 0)
+ return 3;
+
+ return 0;
+ ]])],
+ gl_cv_func_svid_putenv=yes,
+ gl_cv_func_svid_putenv=no,
+ dnl When crosscompiling, assume putenv is broken.
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_svid_putenv="guessing no" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_svid_putenv" in
+ *yes) ;;
+ *)
+ REPLACE_PUTENV=1
+ ;;
+ esac
+])
=== added file 'm4/setenv.m4'
--- m4/setenv.m4 1970-01-01 00:00:00 +0000
+++ m4/setenv.m4 2012-12-03 20:03:22 +0000
@@ -0,0 +1,160 @@
+# setenv.m4 serial 26
+dnl Copyright (C) 2001-2004, 2006-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_SETENV],
+[
+ AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ if test $ac_cv_func_setenv = no; then
+ HAVE_SETENV=0
+ else
+ AC_CACHE_CHECK([whether setenv validates arguments],
+ [gl_cv_func_setenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <string.h>
+ ]], [[
+ int result = 0;
+ {
+ if (setenv ("", "", 0) != -1)
+ result |= 1;
+ else if (errno != EINVAL)
+ result |= 2;
+ }
+ {
+ if (setenv ("a", "=", 1) != 0)
+ result |= 4;
+ else if (strcmp (getenv ("a"), "=") != 0)
+ result |= 8;
+ }
+ return result;
+ ]])],
+ [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_setenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_setenv_works="guessing no" ;;
+ esac
+ ])])
+ case "$gl_cv_func_setenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_SETENV=1
+ ;;
+ esac
+ fi
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation
+# (no REPLACE_SETENV, no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_DECLS_ONCE([setenv])
+ if test $ac_cv_have_decl_setenv = no; then
+ HAVE_DECL_SETENV=0
+ fi
+ AC_CHECK_FUNCS_ONCE([setenv])
+ gl_PREREQ_SETENV
+])
+
+AC_DEFUN([gl_FUNC_UNSETENV],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_DECLS_ONCE([unsetenv])
+ if test $ac_cv_have_decl_unsetenv = no; then
+ HAVE_DECL_UNSETENV=0
+ fi
+ AC_CHECK_FUNCS([unsetenv])
+ if test $ac_cv_func_unsetenv = no; then
+ HAVE_UNSETENV=0
+ else
+ HAVE_UNSETENV=1
+ dnl Some BSDs return void, failing to do error checking.
+ AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+#undef _BSD
+#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
+#include <stdlib.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+int unsetenv (const char *name);
+ ]],
+ [[]])],
+ [gt_cv_func_unsetenv_ret='int'],
+ [gt_cv_func_unsetenv_ret='void'])])
+ if test $gt_cv_func_unsetenv_ret = 'void'; then
+ AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
+ instead of int.])
+ REPLACE_UNSETENV=1
+ fi
+
+ dnl Solaris 10 unsetenv does not remove all copies of a name.
+ dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
+ dnl OpenBSD 4.7 unsetenv("") does not fail.
+ AC_CACHE_CHECK([whether unsetenv obeys POSIX],
+ [gl_cv_func_unsetenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ extern char **environ;
+ ]], [[
+ char entry1[] = "a=1";
+ char entry2[] = "b=2";
+ char *env[] = { entry1, entry2, NULL };
+ if (putenv ((char *) "a=1")) return 1;
+ if (putenv (entry2)) return 2;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
+ entry2[0] = 'b';
+ environ = env;
+ if (!getenv ("a")) return 5;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 6;
+ ]])],
+ [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_unsetenv_works="guessing no" ;;
+ esac
+ ])])
+ case "$gl_cv_func_unsetenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_UNSETENV=1
+ ;;
+ esac
+ fi
+])
+
+# Prerequisites of lib/setenv.c.
+AC_DEFUN([gl_PREREQ_SETENV],
+[
+ AC_REQUIRE([AC_FUNC_ALLOCA])
+ AC_REQUIRE([gl_ENVIRON])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
+ AC_CHECK_HEADERS([search.h])
+ AC_CHECK_FUNCS([tsearch])
+])
+
+# Prerequisites of lib/unsetenv.c.
+AC_DEFUN([gl_PREREQ_UNSETENV],
+[
+ AC_REQUIRE([gl_ENVIRON])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
+])
=== modified file 'src/ChangeLog'
--- src/ChangeLog 2012-12-03 19:16:17 +0000
+++ src/ChangeLog 2012-12-03 20:07:13 +0000
@@ -1,3 +1,27 @@
+2012-12-03 Paul Eggert <eggert@cs.ucla.edu>
+
+ Use putenv+unsetenv instead of modifying environ directly.
+ * alloc.c (xputenv): New function.
+ * dbusbind.c (Fdbus_init_bus):
+ * emacs.c (main):
+ * xterm.c (x_term_init):
+ Use xputenv instead of setenv or putenv, to detect memory exhaustion.
+ * editfns.c (initial_tz): Move static var decl up.
+ (tzvalbuf_in_environ): New static var.
+ (init_editfns): Initialize these two static vars.
+ (Fencode_time): Don't assume arbitrary limit on EMACS_INT width.
+ Save old TZ value on stack, if it's small.
+ (Fencode_time, set_time_zone_rule): Don't modify 'environ' directly;
+ instead, use xputenv+unsetenv to set and restore TZ.
+ (environbuf): Remove static var. All uses removed.
+ (Fset_time_zone_rule): Do not save TZ and environ; no longer needed here.
+ (set_time_zone_rule_tz1, set_time_zone_rule_tz2) [LOCALTIME_CACHE]:
+ Move to inside set_time_zone_rule; they don't need file scope any more.
+ (set_time_zone_rule): Maintain the TZ=value string separately.
+ (syms_of_editfns): Don't initialize initial_tz; init_editfns now does it.
+ * emacs.c (dump_tz) [HAVE_TZSET]: Now const.
+ * lisp.h (xputenv): New decl.
+
2012-12-03 Jan Djärv <jan.h.d@swipnet.se>
* gtkutil.c (my_log_handler): New function.
=== modified file 'src/alloc.c'
--- src/alloc.c 2012-12-03 08:06:02 +0000
+++ src/alloc.c 2012-12-03 20:07:13 +0000
@@ -820,6 +820,15 @@
return p;
}
+/* Like putenv, but (1) use the equivalent of xmalloc and (2) the
+ argument is a const pointer. */
+
+void
+xputenv (char const *string)
+{
+ if (putenv ((char *) string) != 0)
+ memory_full (0);
+}
/* Unwind for SAFE_ALLOCA */
=== modified file 'src/dbusbind.c'
--- src/dbusbind.c 2012-10-31 11:45:40 +0000
+++ src/dbusbind.c 2012-12-03 20:03:22 +0000
@@ -1203,7 +1203,7 @@
xd_registered_buses = Fcons (Fcons (bus, val), xd_registered_buses);
/* We do not want to abort. */
- putenv ((char *) "DBUS_FATAL_WARNINGS=0");
+ xputenv ("DBUS_FATAL_WARNINGS=0");
/* Cleanup. */
dbus_error_free (&derror);
=== modified file 'src/editfns.c'
--- src/editfns.c 2012-12-03 14:13:06 +0000
+++ src/editfns.c 2012-12-03 20:07:13 +0000
@@ -78,6 +78,15 @@
static Lisp_Object Qboundary;
+/* The startup value of the TZ environment variable so it can be
+ restored if the user calls set-time-zone-rule with a nil
+ argument. If null, the TZ environment variable was unset. */
+static char const *initial_tz;
+
+/* True if the static variable tzvalbuf (defined in
+ set_time_zone_rule) is part of 'environ'. */
+static bool tzvalbuf_in_environ;
+
void
init_editfns (void)
@@ -96,6 +105,9 @@
return;
#endif /* not CANNOT_DUMP */
+ initial_tz = getenv ("TZ");
+ tzvalbuf_in_environ = 0;
+
pw = getpwuid (getuid ());
#ifdef MSDOS
/* We let the real user name default to "root" because that's quite
@@ -1900,9 +1912,11 @@
}
else
{
- char tzbuf[100];
+ static char const tzbuf_format[] = "XXX%s%"pI"d:%02d:%02d";
+ char tzbuf[sizeof tzbuf_format + INT_STRLEN_BOUND (EMACS_INT)];
+ char *old_tzstring;
const char *tzstring;
- char **oldenv = environ, **newenv;
+ USE_SAFE_ALLOCA;
if (EQ (zone, Qt))
tzstring = "UTC0";
@@ -1914,13 +1928,20 @@
EMACS_INT zone_hr = abszone / (60*60);
int zone_min = (abszone/60) % 60;
int zone_sec = abszone % 60;
- sprintf (tzbuf, "XXX%s%"pI"d:%02d:%02d", "-" + (XINT (zone) < 0),
+ sprintf (tzbuf, tzbuf_format, "-" + (XINT (zone) < 0),
zone_hr, zone_min, zone_sec);
tzstring = tzbuf;
}
else
error ("Invalid time zone specification");
+ old_tzstring = getenv ("TZ");
+ if (old_tzstring)
+ {
+ char *buf = SAFE_ALLOCA (strlen (old_tzstring) + 1);
+ old_tzstring = strcpy (buf, old_tzstring);
+ }
+
block_input ();
/* Set TZ before calling mktime; merely adjusting mktime's returned
@@ -1929,15 +1950,12 @@
value = mktime (&tm);
- /* Restore TZ to previous value. */
- newenv = environ;
- environ = oldenv;
+ set_time_zone_rule (old_tzstring);
#ifdef LOCALTIME_CACHE
tzset ();
#endif
unblock_input ();
-
- xfree (newenv);
+ SAFE_FREE ();
}
if (value == (time_t) -1)
@@ -2067,16 +2085,6 @@
return list2 (zone_offset, zone_name);
}
-/* This holds the value of `environ' produced by the previous
- call to Fset_time_zone_rule, or 0 if Fset_time_zone_rule
- has never been called. */
-static char **environbuf;
-
-/* This holds the startup value of the TZ environment variable so it
- can be restored if the user calls set-time-zone-rule with a nil
- argument. */
-static char *initial_tz;
-
DEFUN ("set-time-zone-rule", Fset_time_zone_rule, Sset_time_zone_rule, 1, 1, 0,
doc: /* Set the local time zone using TZ, a string specifying a time zone rule.
If TZ is nil, use implementation-defined default time zone information.
@@ -2089,18 +2097,10 @@
(Lisp_Object tz)
{
const char *tzstring;
- char **old_environbuf;
if (! (NILP (tz) || EQ (tz, Qt)))
CHECK_STRING (tz);
- block_input ();
-
- /* When called for the first time, save the original TZ. */
- old_environbuf = environbuf;
- if (!old_environbuf)
- initial_tz = (char *) getenv ("TZ");
-
if (NILP (tz))
tzstring = initial_tz;
else if (EQ (tz, Qt))
@@ -2108,106 +2108,97 @@
else
tzstring = SSDATA (tz);
+ block_input ();
set_time_zone_rule (tzstring);
- environbuf = environ;
-
unblock_input ();
- xfree (old_environbuf);
return Qnil;
}
-#ifdef LOCALTIME_CACHE
-
-/* These two values are known to load tz files in buggy implementations,
- i.e. Solaris 1 executables running under either Solaris 1 or Solaris 2.
- Their values shouldn't matter in non-buggy implementations.
- We don't use string literals for these strings,
- since if a string in the environment is in readonly
- storage, it runs afoul of bugs in SVR4 and Solaris 2.3.
- See Sun bugs 1113095 and 1114114, ``Timezone routines
- improperly modify environment''. */
-
-static char set_time_zone_rule_tz1[] = "TZ=GMT+0";
-static char set_time_zone_rule_tz2[] = "TZ=GMT+1";
-
-#endif
-
/* Set the local time zone rule to TZSTRING.
- This allocates memory into `environ', which it is the caller's
- responsibility to free. */
+
+ This function is not thread-safe, partly because putenv, unsetenv
+ and tzset are not, and partly because of the static storage it
+ updates. Other threads that invoke localtime etc. may be adversely
+ affected while this function is executing. */
void
set_time_zone_rule (const char *tzstring)
{
- ptrdiff_t envptrs;
- char **from, **to, **newenv;
-
- /* Make the ENVIRON vector longer with room for TZSTRING. */
- for (from = environ; *from; from++)
- continue;
- envptrs = from - environ + 2;
- newenv = to = xmalloc (envptrs * sizeof *newenv
- + (tzstring ? strlen (tzstring) + 4 : 0));
-
- /* Add TZSTRING to the end of environ, as a value for TZ. */
+ /* A buffer holding a string of the form "TZ=value", intended
+ to be part of the environment. */
+ static char *tzvalbuf;
+ static ptrdiff_t tzvalbufsize;
+
+ int tzeqlen = sizeof "TZ=" - 1;
+
+#ifdef LOCALTIME_CACHE
+ /* These two values are known to load tz files in buggy implementations,
+ i.e. Solaris 1 executables running under either Solaris 1 or Solaris 2.
+ Their values shouldn't matter in non-buggy implementations.
+ We don't use string literals for these strings,
+ since if a string in the environment is in readonly
+ storage, it runs afoul of bugs in SVR4 and Solaris 2.3.
+ See Sun bugs 1113095 and 1114114, ``Timezone routines
+ improperly modify environment''. */
+
+ static char set_time_zone_rule_tz[][sizeof "TZ=GMT+0"]
+ = { "TZ=GMT+0", "TZ=GMT+1" };
+
+ /* In SunOS 4.1.3_U1 and 4.1.4, if TZ has a value like
+ "US/Pacific" that loads a tz file, then changes to a value like
+ "XXX0" that does not load a tz file, and then changes back to
+ its original value, the last change is (incorrectly) ignored.
+ Also, if TZ changes twice in succession to values that do
+ not load a tz file, tzset can dump core (see Sun bug#1225179).
+ The following code works around these bugs. */
+
if (tzstring)
{
- char *t = (char *) (to + envptrs);
- strcpy (t, "TZ=");
- strcat (t, tzstring);
- *to++ = t;
- }
-
- /* Copy the old environ vector elements into NEWENV,
- but don't copy the TZ variable.
- So we have only one definition of TZ, which came from TZSTRING. */
- for (from = environ; *from; from++)
- if (strncmp (*from, "TZ=", 3) != 0)
- *to++ = *from;
- *to = 0;
-
- environ = newenv;
-
- /* If we do have a TZSTRING, NEWENV points to the vector slot where
- the TZ variable is stored. If we do not have a TZSTRING,
- TO points to the vector slot which has the terminating null. */
+ /* Temporarily set TZ to a value that loads a tz file
+ and that differs from tzstring. */
+ bool eq0 = strcmp (tzstring, set_time_zone_rule_tz[0] + tzeqlen) == 0;
+ xputenv (set_time_zone_rule_tz[eq0]);
+ }
+ else
+ {
+ /* The implied tzstring is unknown, so temporarily set TZ to
+ two different values that each load a tz file. */
+ xputenv (set_time_zone_rule_tz[0]);
+ tzset ();
+ xputenv (set_time_zone_rule_tz[1]);
+ }
+ tzset ();
+#endif
+
+ if (!tzstring)
+ {
+ unsetenv ("TZ");
+ tzvalbuf_in_environ = 0;
+ }
+ else
+ {
+ ptrdiff_t tzstringlen = strlen (tzstring);
+
+ if (tzvalbufsize <= tzeqlen + tzstringlen)
+ {
+ unsetenv ("TZ");
+ tzvalbuf_in_environ = 0;
+ tzvalbuf = xpalloc (tzvalbuf, &tzvalbufsize,
+ tzeqlen + tzstringlen - tzvalbufsize + 1, -1, 1);
+ memcpy (tzvalbuf, "TZ=", tzeqlen);
+ }
+
+ strcpy (tzvalbuf + tzeqlen, tzstring);
+
+ if (!tzvalbuf_in_environ)
+ {
+ xputenv (tzvalbuf);
+ tzvalbuf_in_environ = 1;
+ }
+ }
#ifdef LOCALTIME_CACHE
- {
- /* In SunOS 4.1.3_U1 and 4.1.4, if TZ has a value like
- "US/Pacific" that loads a tz file, then changes to a value like
- "XXX0" that does not load a tz file, and then changes back to
- its original value, the last change is (incorrectly) ignored.
- Also, if TZ changes twice in succession to values that do
- not load a tz file, tzset can dump core (see Sun bug#1225179).
- The following code works around these bugs. */
-
- if (tzstring)
- {
- /* Temporarily set TZ to a value that loads a tz file
- and that differs from tzstring. */
- char *tz = *newenv;
- *newenv = (strcmp (tzstring, set_time_zone_rule_tz1 + 3) == 0
- ? set_time_zone_rule_tz2 : set_time_zone_rule_tz1);
- tzset ();
- *newenv = tz;
- }
- else
- {
- /* The implied tzstring is unknown, so temporarily set TZ to
- two different values that each load a tz file. */
- *to = set_time_zone_rule_tz1;
- to[1] = 0;
- tzset ();
- *to = set_time_zone_rule_tz2;
- tzset ();
- *to = 0;
- }
-
- /* Now TZ has the desired value, and tzset can be invoked safely. */
- }
-
tzset ();
#endif
}
@@ -4799,9 +4790,6 @@
void
syms_of_editfns (void)
{
- environbuf = 0;
- initial_tz = 0;
-
DEFSYM (Qbuffer_access_fontify_functions, "buffer-access-fontify-functions");
DEFVAR_LISP ("inhibit-field-text-motion", Vinhibit_field_text_motion,
=== modified file 'src/emacs.c'
--- src/emacs.c 2012-11-21 04:47:55 +0000
+++ src/emacs.c 2012-12-03 20:03:22 +0000
@@ -535,7 +535,7 @@
#ifdef HAVE_TZSET
/* A valid but unlikely value for the TZ environment value.
It is OK (though a bit slower) if the user actually chooses this value. */
-static char dump_tz[] = "UtC0";
+static char const dump_tz[] = "UtC0";
#endif
#ifndef ORDINARY_LINK
@@ -717,7 +717,7 @@
#ifdef G_SLICE_ALWAYS_MALLOC
/* This is used by the Cygwin build. */
- setenv ("G_SLICE", "always-malloc", 1);
+ xputenv ("G_SLICE=always-malloc");
#endif
#ifdef GNU_LINUX
@@ -803,9 +803,8 @@
#ifdef HAVE_PERSONALITY_LINUX32
if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
{
- static char heapexec[] = "EMACS_HEAP_EXEC=true";
/* Set this so we only do this once. */
- putenv (heapexec);
+ xputenv ("EMACS_HEAP_EXEC=true");
/* A flag to turn off address randomization which is introduced
in linux kernel shipped with fedora core 4 */
@@ -1309,7 +1308,7 @@
don't pollute Vglobal_environment. */
/* Setting LANG here will defeat the startup locale processing... */
#ifdef AIX
- putenv ("LANG=C");
+ xputenv ("LANG=C");
#endif
init_buffer (); /* Init default directory of main buffer. */
=== modified file 'src/lisp.h'
--- src/lisp.h 2012-12-03 14:13:06 +0000
+++ src/lisp.h 2012-12-03 20:07:13 +0000
@@ -3594,6 +3594,7 @@
extern void *xpalloc (void *, ptrdiff_t *, ptrdiff_t, ptrdiff_t, ptrdiff_t);
extern char *xstrdup (const char *);
+extern void xputenv (const char *);
extern char *egetenv (const char *);
=== modified file 'src/xterm.c'
--- src/xterm.c 2012-12-01 23:06:14 +0000
+++ src/xterm.c 2012-12-03 20:03:22 +0000
@@ -9909,10 +9909,7 @@
/* Emacs can only handle core input events, so make sure
Gtk doesn't use Xinput or Xinput2 extensions. */
- {
- static char fix_events[] = "GDK_CORE_DEVICE_EVENTS=1";
- putenv (fix_events);
- }
+ xputenv ("GDK_CORE_DEVICE_EVENTS=1");
/* Work around GLib bug that outputs a faulty warning. See
https://bugzilla.gnome.org/show_bug.cgi?id=563627. */
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-03 20:32 bug#13070: Use putenv+unsetenv instead of modifying environ directly Paul Eggert
@ 2012-12-04 13:51 ` Fabrice Popineau
2012-12-04 17:48 ` Eli Zaretskii
2012-12-08 4:02 ` Paul Eggert
0 siblings, 2 replies; 8+ messages in thread
From: Fabrice Popineau @ 2012-12-04 13:51 UTC (permalink / raw)
To: Paul Eggert; +Cc: 13070
[-- Attachment #1: Type: text/plain, Size: 613 bytes --]
Great.
Up to now, it seems to run ok. Provided I added some unsetenv() function
for w32.
(And it is much cleaner that the quick and dirty hack I applied for myself.)
Thanks,
Fabrice
2012/12/3 Paul Eggert <eggert@cs.ucla.edu>
> Tags: patch
>
> The attached patch is in response to last week's thread on emacs-devel
> <http://lists.gnu.org/archive/html/emacs-devel/2012-11/msg00514.html>.
> It's relative to trunk bzr 111078. Tested on Fedora 17. I don't see
> any issues related to the Microsoft port but I'm CC:ing this to Eli
> and Fabrice just in case, as the original bug seems to be Windows-related.
>
[-- Attachment #2: Type: text/html, Size: 1108 bytes --]
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-04 13:51 ` Fabrice Popineau
@ 2012-12-04 17:48 ` Eli Zaretskii
2012-12-08 4:02 ` Paul Eggert
1 sibling, 0 replies; 8+ messages in thread
From: Eli Zaretskii @ 2012-12-04 17:48 UTC (permalink / raw)
To: Fabrice Popineau; +Cc: 13070, eggert
> From: Fabrice Popineau <fabrice.popineau@gmail.com>
> Date: Tue, 4 Dec 2012 14:51:06 +0100
> Cc: bug-gnu-emacs@gnu.org, Eli Zaretskii <eliz@gnu.org>
>
> Up to now, it seems to run ok. Provided I added some unsetenv() function
> for w32.
If you can show your unsetenv, we can commit it in your name, in
preparation for Paul's commit.
Thanks.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-04 13:51 ` Fabrice Popineau
2012-12-04 17:48 ` Eli Zaretskii
@ 2012-12-08 4:02 ` Paul Eggert
2012-12-08 11:42 ` Eli Zaretskii
1 sibling, 1 reply; 8+ messages in thread
From: Paul Eggert @ 2012-12-08 4:02 UTC (permalink / raw)
To: Fabrice Popineau; +Cc: 13070
[-- Attachment #1: Type: text/plain, Size: 355 bytes --]
On 12/04/2012 05:51 AM, Fabrice Popineau wrote:
> Provided I added some unsetenv() function for w32.
Can you just add $(BLD)/unsetenv.$(O) to GNULIBOBJS
in lib/makefile.w32-in, or something like that? No point in
having two implementations of unsetenv.
I've attached a revised patch (sans any change to makefile.w32-in),
relative to trunk bzr 111151.
[-- Attachment #2: setenv.txt --]
[-- Type: text/plain, Size: 33612 bytes --]
=== modified file 'ChangeLog'
--- ChangeLog 2012-12-08 02:30:51 +0000
+++ ChangeLog 2012-12-08 03:46:59 +0000
@@ -1,5 +1,11 @@
2012-12-08 Paul Eggert <eggert@cs.ucla.edu>
+ Use putenv+unsetenv instead of modifying environ directly (Bug#13070).
+ * lib/putenv.c, lib/unsetenv.c, m4/putenv.m4, m4/setenv.m4:
+ New files, copied automatically from gnulib.
+ * lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
+ * merge-gnulib (GNULIB_MODULES): Add putenv, unsetenv.
+
Assume POSIX 1003.1-1988 or later for signal.h (Bug#13026).
* configure.ac (PTY_OPEN, PTY_TTY_NAME_SPRINTF):
Use SIGCHLD rather than SIGCLD.
=== modified file 'admin/ChangeLog'
--- admin/ChangeLog 2012-12-08 02:30:51 +0000
+++ admin/ChangeLog 2012-12-08 03:46:59 +0000
@@ -1,4 +1,7 @@
-2012-12-03 Paul Eggert <eggert@cs.ucla.edu>
+2012-12-08 Paul Eggert <eggert@cs.ucla.edu>
+
+ Use putenv+unsetenv instead of modifying environ directly (Bug#13070).
+ * merge-gnulib (GNULIB_MODULES): Add putenv, unsetenv.
Assume POSIX 1003.1-1988 or later for signal.h (Bug#13026).
* CPP-DEFINES (SIGALRM, SIGCHLD, SIGHUP, SIGKILL, SIGPIPE, SIGQUIT):
=== modified file 'admin/merge-gnulib'
--- admin/merge-gnulib 2012-12-08 02:30:51 +0000
+++ admin/merge-gnulib 2012-12-08 03:46:59 +0000
@@ -31,10 +31,10 @@
dtoastr dtotimespec dup2 environ execinfo faccessat
fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday
ignore-value intprops largefile lstat
- manywarnings mktime pselect pthread_sigmask readlink
+ manywarnings mktime pselect pthread_sigmask putenv readlink
sig2str socklen stat-time stdalign stdarg stdbool stdio
strftime strtoimax strtoumax symlink sys_stat
- sys_time time timer-time timespec-add timespec-sub utimens
+ sys_time time timer-time timespec-add timespec-sub unsetenv utimens
warnings
'
=== modified file 'lib/gnulib.mk'
--- lib/gnulib.mk 2012-12-08 02:30:51 +0000
+++ lib/gnulib.mk 2012-12-08 03:46:59 +0000
@@ -21,7 +21,7 @@
# the same distribution terms as the rest of that program.
#
# Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=at-internal --avoid=errno --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=openat-h --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings mktime pselect pthread_sigmask readlink sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub utimens warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=at-internal --avoid=errno --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=openat-h --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings mktime pselect pthread_sigmask putenv readlink sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
MOSTLYCLEANFILES += core *.stackdump
@@ -439,6 +439,15 @@
## end gnulib module pthread_sigmask
+## begin gnulib module putenv
+
+
+EXTRA_DIST += putenv.c
+
+EXTRA_libgnu_a_SOURCES += putenv.c
+
+## end gnulib module putenv
+
## begin gnulib module readlink
@@ -1409,6 +1418,15 @@
## end gnulib module unistd
+## begin gnulib module unsetenv
+
+
+EXTRA_DIST += unsetenv.c
+
+EXTRA_libgnu_a_SOURCES += unsetenv.c
+
+## end gnulib module unsetenv
+
## begin gnulib module utimens
libgnu_a_SOURCES += utimens.c
=== added file 'lib/putenv.c'
--- lib/putenv.c 1970-01-01 00:00:00 +0000
+++ lib/putenv.c 2012-12-03 20:03:22 +0000
@@ -0,0 +1,134 @@
+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2012 Free Software
+ Foundation, Inc.
+
+ NOTE: The canonical source of this file is maintained with the GNU C
+ Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+ This program 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 any
+ later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <stdlib.h>
+
+#include <stddef.h>
+
+/* Include errno.h *after* sys/types.h to work around header problems
+ on AIX 3.2.5. */
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(ev) ((errno) = (ev))
+#endif
+
+#include <string.h>
+#include <unistd.h>
+
+#if _LIBC
+# if HAVE_GNU_LD
+# define environ __environ
+# else
+extern char **environ;
+# endif
+#endif
+
+#if _LIBC
+/* This lock protects against simultaneous modifications of 'environ'. */
+# include <bits/libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+static int
+_unsetenv (const char *name)
+{
+ size_t len;
+ char **ep;
+
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+ LOCK;
+
+ ep = environ;
+ while (*ep != NULL)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+ else
+ ++ep;
+
+ UNLOCK;
+
+ return 0;
+}
+
+
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.
+ If STRING contains no '=', then remove STRING from the environment. */
+int
+putenv (char *string)
+{
+ const char *const name_end = strchr (string, '=');
+ register size_t size;
+ register char **ep;
+
+ if (name_end == NULL)
+ {
+ /* Remove the variable from the environment. */
+ return _unsetenv (string);
+ }
+
+ size = 0;
+ for (ep = environ; *ep != NULL; ++ep)
+ if (!strncmp (*ep, string, name_end - string) &&
+ (*ep)[name_end - string] == '=')
+ break;
+ else
+ ++size;
+
+ if (*ep == NULL)
+ {
+ static char **last_environ = NULL;
+ char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
+ if (new_environ == NULL)
+ return -1;
+ (void) memcpy ((void *) new_environ, (void *) environ,
+ size * sizeof (char *));
+ new_environ[size] = (char *) string;
+ new_environ[size + 1] = NULL;
+ free (last_environ);
+ last_environ = new_environ;
+ environ = new_environ;
+ }
+ else
+ *ep = string;
+
+ return 0;
+}
=== added file 'lib/unsetenv.c'
--- lib/unsetenv.c 1970-01-01 00:00:00 +0000
+++ lib/unsetenv.c 2012-12-03 20:03:22 +0000
@@ -0,0 +1,127 @@
+/* Copyright (C) 1992, 1995-2002, 2005-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ This program 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.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
+ optimizes away the name == NULL test below. */
+#define _GL_ARG_NONNULL(params)
+
+/* Specification. */
+#include <stdlib.h>
+
+#include <errno.h>
+#if !_LIBC
+# define __set_errno(ev) ((errno) = (ev))
+#endif
+
+#include <string.h>
+#include <unistd.h>
+
+#if !_LIBC
+# define __environ environ
+#endif
+
+#if _LIBC
+/* This lock protects against simultaneous modifications of 'environ'. */
+# include <bits/libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+/* In the GNU C library we must keep the namespace clean. */
+#ifdef _LIBC
+# define unsetenv __unsetenv
+#endif
+
+#if _LIBC || !HAVE_UNSETENV
+
+int
+unsetenv (const char *name)
+{
+ size_t len;
+ char **ep;
+
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+ LOCK;
+
+ ep = __environ;
+ while (*ep != NULL)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+ else
+ ++ep;
+
+ UNLOCK;
+
+ return 0;
+}
+
+#ifdef _LIBC
+# undef unsetenv
+weak_alias (__unsetenv, unsetenv)
+#endif
+
+#else /* HAVE_UNSETENV */
+
+# undef unsetenv
+# if !HAVE_DECL_UNSETENV
+# if VOID_UNSETENV
+extern void unsetenv (const char *);
+# else
+extern int unsetenv (const char *);
+# endif
+# endif
+
+/* Call the underlying unsetenv, in case there is hidden bookkeeping
+ that needs updating beyond just modifying environ. */
+int
+rpl_unsetenv (const char *name)
+{
+ int result = 0;
+ if (!name || !*name || strchr (name, '='))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ while (getenv (name))
+# if !VOID_UNSETENV
+ result =
+# endif
+ unsetenv (name);
+ return result;
+}
+
+#endif /* HAVE_UNSETENV */
=== modified file 'm4/gnulib-comp.m4'
--- m4/gnulib-comp.m4 2012-12-08 02:30:51 +0000
+++ m4/gnulib-comp.m4 2012-12-08 03:46:59 +0000
@@ -85,6 +85,7 @@
# Code from module pathmax:
# Code from module pselect:
# Code from module pthread_sigmask:
+ # Code from module putenv:
# Code from module readlink:
# Code from module root-uid:
# Code from module sig2str:
@@ -126,6 +127,7 @@
# Code from module timespec-sub:
# Code from module u64:
# Code from module unistd:
+ # Code from module unsetenv:
# Code from module utimens:
# Code from module verify:
# Code from module warnings:
@@ -240,6 +242,11 @@
gl_PREREQ_PTHREAD_SIGMASK
fi
gl_SIGNAL_MODULE_INDICATOR([pthread_sigmask])
+ gl_FUNC_PUTENV
+ if test $REPLACE_PUTENV = 1; then
+ AC_LIBOBJ([putenv])
+ fi
+ gl_STDLIB_MODULE_INDICATOR([putenv])
gl_FUNC_READLINK
if test $HAVE_READLINK = 0 || test $REPLACE_READLINK = 1; then
AC_LIBOBJ([readlink])
@@ -297,6 +304,12 @@
gl_TIMER_TIME
gl_TIMESPEC
gl_UNISTD_H
+ gl_FUNC_UNSETENV
+ if test $HAVE_UNSETENV = 0 || test $REPLACE_UNSETENV = 1; then
+ AC_LIBOBJ([unsetenv])
+ gl_PREREQ_UNSETENV
+ fi
+ gl_STDLIB_MODULE_INDICATOR([unsetenv])
gl_UTIMENS
gl_gnulib_enabled_dosname=false
gl_gnulib_enabled_euidaccess=false
@@ -679,6 +692,7 @@
lib/pathmax.h
lib/pselect.c
lib/pthread_sigmask.c
+ lib/putenv.c
lib/readlink.c
lib/root-uid.h
lib/sha1.c
@@ -723,6 +737,7 @@
lib/u64.h
lib/unistd.c
lib/unistd.in.h
+ lib/unsetenv.c
lib/utimens.c
lib/utimens.h
lib/verify.h
@@ -764,7 +779,9 @@
m4/pathmax.m4
m4/pselect.m4
m4/pthread_sigmask.m4
+ m4/putenv.m4
m4/readlink.m4
+ m4/setenv.m4
m4/sha1.m4
m4/sha256.m4
m4/sha512.m4
=== added file 'm4/putenv.m4'
--- m4/putenv.m4 1970-01-01 00:00:00 +0000
+++ m4/putenv.m4 2012-12-03 20:03:22 +0000
@@ -0,0 +1,50 @@
+# putenv.m4 serial 19
+dnl Copyright (C) 2002-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Jim Meyering.
+dnl
+dnl Check whether putenv ("FOO") removes FOO from the environment.
+dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.
+
+AC_DEFUN([gl_FUNC_PUTENV],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
+ [gl_cv_func_svid_putenv],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
+ /* Put it in env. */
+ if (putenv ("CONFTEST_putenv=val"))
+ return 1;
+
+ /* Try to remove it. */
+ if (putenv ("CONFTEST_putenv"))
+ return 2;
+
+ /* Make sure it was deleted. */
+ if (getenv ("CONFTEST_putenv") != 0)
+ return 3;
+
+ return 0;
+ ]])],
+ gl_cv_func_svid_putenv=yes,
+ gl_cv_func_svid_putenv=no,
+ dnl When crosscompiling, assume putenv is broken.
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_svid_putenv="guessing no" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_svid_putenv" in
+ *yes) ;;
+ *)
+ REPLACE_PUTENV=1
+ ;;
+ esac
+])
=== added file 'm4/setenv.m4'
--- m4/setenv.m4 1970-01-01 00:00:00 +0000
+++ m4/setenv.m4 2012-12-03 20:03:22 +0000
@@ -0,0 +1,160 @@
+# setenv.m4 serial 26
+dnl Copyright (C) 2001-2004, 2006-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_SETENV],
+[
+ AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ if test $ac_cv_func_setenv = no; then
+ HAVE_SETENV=0
+ else
+ AC_CACHE_CHECK([whether setenv validates arguments],
+ [gl_cv_func_setenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <string.h>
+ ]], [[
+ int result = 0;
+ {
+ if (setenv ("", "", 0) != -1)
+ result |= 1;
+ else if (errno != EINVAL)
+ result |= 2;
+ }
+ {
+ if (setenv ("a", "=", 1) != 0)
+ result |= 4;
+ else if (strcmp (getenv ("a"), "=") != 0)
+ result |= 8;
+ }
+ return result;
+ ]])],
+ [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_setenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_setenv_works="guessing no" ;;
+ esac
+ ])])
+ case "$gl_cv_func_setenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_SETENV=1
+ ;;
+ esac
+ fi
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation
+# (no REPLACE_SETENV, no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_DECLS_ONCE([setenv])
+ if test $ac_cv_have_decl_setenv = no; then
+ HAVE_DECL_SETENV=0
+ fi
+ AC_CHECK_FUNCS_ONCE([setenv])
+ gl_PREREQ_SETENV
+])
+
+AC_DEFUN([gl_FUNC_UNSETENV],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_DECLS_ONCE([unsetenv])
+ if test $ac_cv_have_decl_unsetenv = no; then
+ HAVE_DECL_UNSETENV=0
+ fi
+ AC_CHECK_FUNCS([unsetenv])
+ if test $ac_cv_func_unsetenv = no; then
+ HAVE_UNSETENV=0
+ else
+ HAVE_UNSETENV=1
+ dnl Some BSDs return void, failing to do error checking.
+ AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+#undef _BSD
+#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
+#include <stdlib.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+int unsetenv (const char *name);
+ ]],
+ [[]])],
+ [gt_cv_func_unsetenv_ret='int'],
+ [gt_cv_func_unsetenv_ret='void'])])
+ if test $gt_cv_func_unsetenv_ret = 'void'; then
+ AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
+ instead of int.])
+ REPLACE_UNSETENV=1
+ fi
+
+ dnl Solaris 10 unsetenv does not remove all copies of a name.
+ dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
+ dnl OpenBSD 4.7 unsetenv("") does not fail.
+ AC_CACHE_CHECK([whether unsetenv obeys POSIX],
+ [gl_cv_func_unsetenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ extern char **environ;
+ ]], [[
+ char entry1[] = "a=1";
+ char entry2[] = "b=2";
+ char *env[] = { entry1, entry2, NULL };
+ if (putenv ((char *) "a=1")) return 1;
+ if (putenv (entry2)) return 2;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
+ entry2[0] = 'b';
+ environ = env;
+ if (!getenv ("a")) return 5;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 6;
+ ]])],
+ [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_unsetenv_works="guessing no" ;;
+ esac
+ ])])
+ case "$gl_cv_func_unsetenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_UNSETENV=1
+ ;;
+ esac
+ fi
+])
+
+# Prerequisites of lib/setenv.c.
+AC_DEFUN([gl_PREREQ_SETENV],
+[
+ AC_REQUIRE([AC_FUNC_ALLOCA])
+ AC_REQUIRE([gl_ENVIRON])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
+ AC_CHECK_HEADERS([search.h])
+ AC_CHECK_FUNCS([tsearch])
+])
+
+# Prerequisites of lib/unsetenv.c.
+AC_DEFUN([gl_PREREQ_UNSETENV],
+[
+ AC_REQUIRE([gl_ENVIRON])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
+])
=== modified file 'src/ChangeLog'
--- src/ChangeLog 2012-12-08 02:30:51 +0000
+++ src/ChangeLog 2012-12-08 03:46:59 +0000
@@ -1,5 +1,27 @@
2012-12-08 Paul Eggert <eggert@cs.ucla.edu>
+ Use putenv+unsetenv instead of modifying environ directly (Bug#13070).
+ * alloc.c (xputenv): New function.
+ * dbusbind.c (Fdbus_init_bus):
+ * emacs.c (main):
+ * xterm.c (x_term_init):
+ Use xputenv instead of setenv or putenv, to detect memory exhaustion.
+ * editfns.c (initial_tz): Move static var decl up.
+ (tzvalbuf_in_environ): New static var.
+ (init_editfns): Initialize these two static vars.
+ (Fencode_time): Don't assume arbitrary limit on EMACS_INT width.
+ Save old TZ value on stack, if it's small.
+ (Fencode_time, set_time_zone_rule): Don't modify 'environ' directly;
+ instead, use xputenv+unsetenv to set and restore TZ.
+ (environbuf): Remove static var. All uses removed.
+ (Fset_time_zone_rule): Do not save TZ and environ; no longer needed here.
+ (set_time_zone_rule_tz1, set_time_zone_rule_tz2) [LOCALTIME_CACHE]:
+ Move to inside set_time_zone_rule; they don't need file scope any more.
+ (set_time_zone_rule): Maintain the TZ=value string separately.
+ (syms_of_editfns): Don't initialize initial_tz; init_editfns now does it.
+ * emacs.c (dump_tz) [HAVE_TZSET]: Now const.
+ * lisp.h (xputenv): New decl.
+
Assume POSIX 1003.1-1988 or later for signal.h (Bug#13026).
Exceptions: do not assume SIGCONT, SIGSTOP, SIGTSTP, SIGTTIN,
SIGTTOU, SIGUSR1, SIGUSR2, as Microsoft platforms lack these.
=== modified file 'src/alloc.c'
--- src/alloc.c 2012-12-03 08:06:02 +0000
+++ src/alloc.c 2012-12-03 20:07:13 +0000
@@ -820,6 +820,15 @@
return p;
}
+/* Like putenv, but (1) use the equivalent of xmalloc and (2) the
+ argument is a const pointer. */
+
+void
+xputenv (char const *string)
+{
+ if (putenv ((char *) string) != 0)
+ memory_full (0);
+}
/* Unwind for SAFE_ALLOCA */
=== modified file 'src/dbusbind.c'
--- src/dbusbind.c 2012-10-31 11:45:40 +0000
+++ src/dbusbind.c 2012-12-03 20:03:22 +0000
@@ -1203,7 +1203,7 @@
xd_registered_buses = Fcons (Fcons (bus, val), xd_registered_buses);
/* We do not want to abort. */
- putenv ((char *) "DBUS_FATAL_WARNINGS=0");
+ xputenv ("DBUS_FATAL_WARNINGS=0");
/* Cleanup. */
dbus_error_free (&derror);
=== modified file 'src/editfns.c'
--- src/editfns.c 2012-12-03 14:13:06 +0000
+++ src/editfns.c 2012-12-03 20:07:13 +0000
@@ -78,6 +78,15 @@
static Lisp_Object Qboundary;
+/* The startup value of the TZ environment variable so it can be
+ restored if the user calls set-time-zone-rule with a nil
+ argument. If null, the TZ environment variable was unset. */
+static char const *initial_tz;
+
+/* True if the static variable tzvalbuf (defined in
+ set_time_zone_rule) is part of 'environ'. */
+static bool tzvalbuf_in_environ;
+
void
init_editfns (void)
@@ -96,6 +105,9 @@
return;
#endif /* not CANNOT_DUMP */
+ initial_tz = getenv ("TZ");
+ tzvalbuf_in_environ = 0;
+
pw = getpwuid (getuid ());
#ifdef MSDOS
/* We let the real user name default to "root" because that's quite
@@ -1900,9 +1912,11 @@
}
else
{
- char tzbuf[100];
+ static char const tzbuf_format[] = "XXX%s%"pI"d:%02d:%02d";
+ char tzbuf[sizeof tzbuf_format + INT_STRLEN_BOUND (EMACS_INT)];
+ char *old_tzstring;
const char *tzstring;
- char **oldenv = environ, **newenv;
+ USE_SAFE_ALLOCA;
if (EQ (zone, Qt))
tzstring = "UTC0";
@@ -1914,13 +1928,20 @@
EMACS_INT zone_hr = abszone / (60*60);
int zone_min = (abszone/60) % 60;
int zone_sec = abszone % 60;
- sprintf (tzbuf, "XXX%s%"pI"d:%02d:%02d", "-" + (XINT (zone) < 0),
+ sprintf (tzbuf, tzbuf_format, "-" + (XINT (zone) < 0),
zone_hr, zone_min, zone_sec);
tzstring = tzbuf;
}
else
error ("Invalid time zone specification");
+ old_tzstring = getenv ("TZ");
+ if (old_tzstring)
+ {
+ char *buf = SAFE_ALLOCA (strlen (old_tzstring) + 1);
+ old_tzstring = strcpy (buf, old_tzstring);
+ }
+
block_input ();
/* Set TZ before calling mktime; merely adjusting mktime's returned
@@ -1929,15 +1950,12 @@
value = mktime (&tm);
- /* Restore TZ to previous value. */
- newenv = environ;
- environ = oldenv;
+ set_time_zone_rule (old_tzstring);
#ifdef LOCALTIME_CACHE
tzset ();
#endif
unblock_input ();
-
- xfree (newenv);
+ SAFE_FREE ();
}
if (value == (time_t) -1)
@@ -2067,16 +2085,6 @@
return list2 (zone_offset, zone_name);
}
-/* This holds the value of `environ' produced by the previous
- call to Fset_time_zone_rule, or 0 if Fset_time_zone_rule
- has never been called. */
-static char **environbuf;
-
-/* This holds the startup value of the TZ environment variable so it
- can be restored if the user calls set-time-zone-rule with a nil
- argument. */
-static char *initial_tz;
-
DEFUN ("set-time-zone-rule", Fset_time_zone_rule, Sset_time_zone_rule, 1, 1, 0,
doc: /* Set the local time zone using TZ, a string specifying a time zone rule.
If TZ is nil, use implementation-defined default time zone information.
@@ -2089,18 +2097,10 @@
(Lisp_Object tz)
{
const char *tzstring;
- char **old_environbuf;
if (! (NILP (tz) || EQ (tz, Qt)))
CHECK_STRING (tz);
- block_input ();
-
- /* When called for the first time, save the original TZ. */
- old_environbuf = environbuf;
- if (!old_environbuf)
- initial_tz = (char *) getenv ("TZ");
-
if (NILP (tz))
tzstring = initial_tz;
else if (EQ (tz, Qt))
@@ -2108,106 +2108,97 @@
else
tzstring = SSDATA (tz);
+ block_input ();
set_time_zone_rule (tzstring);
- environbuf = environ;
-
unblock_input ();
- xfree (old_environbuf);
return Qnil;
}
-#ifdef LOCALTIME_CACHE
-
-/* These two values are known to load tz files in buggy implementations,
- i.e. Solaris 1 executables running under either Solaris 1 or Solaris 2.
- Their values shouldn't matter in non-buggy implementations.
- We don't use string literals for these strings,
- since if a string in the environment is in readonly
- storage, it runs afoul of bugs in SVR4 and Solaris 2.3.
- See Sun bugs 1113095 and 1114114, ``Timezone routines
- improperly modify environment''. */
-
-static char set_time_zone_rule_tz1[] = "TZ=GMT+0";
-static char set_time_zone_rule_tz2[] = "TZ=GMT+1";
-
-#endif
-
/* Set the local time zone rule to TZSTRING.
- This allocates memory into `environ', which it is the caller's
- responsibility to free. */
+
+ This function is not thread-safe, partly because putenv, unsetenv
+ and tzset are not, and partly because of the static storage it
+ updates. Other threads that invoke localtime etc. may be adversely
+ affected while this function is executing. */
void
set_time_zone_rule (const char *tzstring)
{
- ptrdiff_t envptrs;
- char **from, **to, **newenv;
-
- /* Make the ENVIRON vector longer with room for TZSTRING. */
- for (from = environ; *from; from++)
- continue;
- envptrs = from - environ + 2;
- newenv = to = xmalloc (envptrs * sizeof *newenv
- + (tzstring ? strlen (tzstring) + 4 : 0));
-
- /* Add TZSTRING to the end of environ, as a value for TZ. */
+ /* A buffer holding a string of the form "TZ=value", intended
+ to be part of the environment. */
+ static char *tzvalbuf;
+ static ptrdiff_t tzvalbufsize;
+
+ int tzeqlen = sizeof "TZ=" - 1;
+
+#ifdef LOCALTIME_CACHE
+ /* These two values are known to load tz files in buggy implementations,
+ i.e. Solaris 1 executables running under either Solaris 1 or Solaris 2.
+ Their values shouldn't matter in non-buggy implementations.
+ We don't use string literals for these strings,
+ since if a string in the environment is in readonly
+ storage, it runs afoul of bugs in SVR4 and Solaris 2.3.
+ See Sun bugs 1113095 and 1114114, ``Timezone routines
+ improperly modify environment''. */
+
+ static char set_time_zone_rule_tz[][sizeof "TZ=GMT+0"]
+ = { "TZ=GMT+0", "TZ=GMT+1" };
+
+ /* In SunOS 4.1.3_U1 and 4.1.4, if TZ has a value like
+ "US/Pacific" that loads a tz file, then changes to a value like
+ "XXX0" that does not load a tz file, and then changes back to
+ its original value, the last change is (incorrectly) ignored.
+ Also, if TZ changes twice in succession to values that do
+ not load a tz file, tzset can dump core (see Sun bug#1225179).
+ The following code works around these bugs. */
+
if (tzstring)
{
- char *t = (char *) (to + envptrs);
- strcpy (t, "TZ=");
- strcat (t, tzstring);
- *to++ = t;
- }
-
- /* Copy the old environ vector elements into NEWENV,
- but don't copy the TZ variable.
- So we have only one definition of TZ, which came from TZSTRING. */
- for (from = environ; *from; from++)
- if (strncmp (*from, "TZ=", 3) != 0)
- *to++ = *from;
- *to = 0;
-
- environ = newenv;
-
- /* If we do have a TZSTRING, NEWENV points to the vector slot where
- the TZ variable is stored. If we do not have a TZSTRING,
- TO points to the vector slot which has the terminating null. */
+ /* Temporarily set TZ to a value that loads a tz file
+ and that differs from tzstring. */
+ bool eq0 = strcmp (tzstring, set_time_zone_rule_tz[0] + tzeqlen) == 0;
+ xputenv (set_time_zone_rule_tz[eq0]);
+ }
+ else
+ {
+ /* The implied tzstring is unknown, so temporarily set TZ to
+ two different values that each load a tz file. */
+ xputenv (set_time_zone_rule_tz[0]);
+ tzset ();
+ xputenv (set_time_zone_rule_tz[1]);
+ }
+ tzset ();
+#endif
+
+ if (!tzstring)
+ {
+ unsetenv ("TZ");
+ tzvalbuf_in_environ = 0;
+ }
+ else
+ {
+ ptrdiff_t tzstringlen = strlen (tzstring);
+
+ if (tzvalbufsize <= tzeqlen + tzstringlen)
+ {
+ unsetenv ("TZ");
+ tzvalbuf_in_environ = 0;
+ tzvalbuf = xpalloc (tzvalbuf, &tzvalbufsize,
+ tzeqlen + tzstringlen - tzvalbufsize + 1, -1, 1);
+ memcpy (tzvalbuf, "TZ=", tzeqlen);
+ }
+
+ strcpy (tzvalbuf + tzeqlen, tzstring);
+
+ if (!tzvalbuf_in_environ)
+ {
+ xputenv (tzvalbuf);
+ tzvalbuf_in_environ = 1;
+ }
+ }
#ifdef LOCALTIME_CACHE
- {
- /* In SunOS 4.1.3_U1 and 4.1.4, if TZ has a value like
- "US/Pacific" that loads a tz file, then changes to a value like
- "XXX0" that does not load a tz file, and then changes back to
- its original value, the last change is (incorrectly) ignored.
- Also, if TZ changes twice in succession to values that do
- not load a tz file, tzset can dump core (see Sun bug#1225179).
- The following code works around these bugs. */
-
- if (tzstring)
- {
- /* Temporarily set TZ to a value that loads a tz file
- and that differs from tzstring. */
- char *tz = *newenv;
- *newenv = (strcmp (tzstring, set_time_zone_rule_tz1 + 3) == 0
- ? set_time_zone_rule_tz2 : set_time_zone_rule_tz1);
- tzset ();
- *newenv = tz;
- }
- else
- {
- /* The implied tzstring is unknown, so temporarily set TZ to
- two different values that each load a tz file. */
- *to = set_time_zone_rule_tz1;
- to[1] = 0;
- tzset ();
- *to = set_time_zone_rule_tz2;
- tzset ();
- *to = 0;
- }
-
- /* Now TZ has the desired value, and tzset can be invoked safely. */
- }
-
tzset ();
#endif
}
@@ -4799,9 +4790,6 @@
void
syms_of_editfns (void)
{
- environbuf = 0;
- initial_tz = 0;
-
DEFSYM (Qbuffer_access_fontify_functions, "buffer-access-fontify-functions");
DEFVAR_LISP ("inhibit-field-text-motion", Vinhibit_field_text_motion,
=== modified file 'src/emacs.c'
--- src/emacs.c 2012-11-21 04:47:55 +0000
+++ src/emacs.c 2012-12-03 20:03:22 +0000
@@ -535,7 +535,7 @@
#ifdef HAVE_TZSET
/* A valid but unlikely value for the TZ environment value.
It is OK (though a bit slower) if the user actually chooses this value. */
-static char dump_tz[] = "UtC0";
+static char const dump_tz[] = "UtC0";
#endif
#ifndef ORDINARY_LINK
@@ -717,7 +717,7 @@
#ifdef G_SLICE_ALWAYS_MALLOC
/* This is used by the Cygwin build. */
- setenv ("G_SLICE", "always-malloc", 1);
+ xputenv ("G_SLICE=always-malloc");
#endif
#ifdef GNU_LINUX
@@ -803,9 +803,8 @@
#ifdef HAVE_PERSONALITY_LINUX32
if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
{
- static char heapexec[] = "EMACS_HEAP_EXEC=true";
/* Set this so we only do this once. */
- putenv (heapexec);
+ xputenv ("EMACS_HEAP_EXEC=true");
/* A flag to turn off address randomization which is introduced
in linux kernel shipped with fedora core 4 */
@@ -1309,7 +1308,7 @@
don't pollute Vglobal_environment. */
/* Setting LANG here will defeat the startup locale processing... */
#ifdef AIX
- putenv ("LANG=C");
+ xputenv ("LANG=C");
#endif
init_buffer (); /* Init default directory of main buffer. */
=== modified file 'src/lisp.h'
--- src/lisp.h 2012-12-04 15:15:30 +0000
+++ src/lisp.h 2012-12-08 03:46:59 +0000
@@ -3594,6 +3594,7 @@
extern void *xpalloc (void *, ptrdiff_t *, ptrdiff_t, ptrdiff_t, ptrdiff_t);
extern char *xstrdup (const char *);
+extern void xputenv (const char *);
extern char *egetenv (const char *);
=== modified file 'src/xterm.c'
--- src/xterm.c 2012-12-04 15:15:30 +0000
+++ src/xterm.c 2012-12-08 03:46:59 +0000
@@ -9908,10 +9908,7 @@
/* Emacs can only handle core input events, so make sure
Gtk doesn't use Xinput or Xinput2 extensions. */
- {
- static char fix_events[] = "GDK_CORE_DEVICE_EVENTS=1";
- putenv (fix_events);
- }
+ xputenv ("GDK_CORE_DEVICE_EVENTS=1");
/* Work around GLib bug that outputs a faulty warning. See
https://bugzilla.gnome.org/show_bug.cgi?id=563627. */
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-08 4:02 ` Paul Eggert
@ 2012-12-08 11:42 ` Eli Zaretskii
2012-12-08 17:20 ` Paul Eggert
0 siblings, 1 reply; 8+ messages in thread
From: Eli Zaretskii @ 2012-12-08 11:42 UTC (permalink / raw)
To: Paul Eggert; +Cc: 13070, fabrice.popineau
> Date: Fri, 07 Dec 2012 20:02:33 -0800
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: 13070@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
>
> On 12/04/2012 05:51 AM, Fabrice Popineau wrote:
> > Provided I added some unsetenv() function for w32.
>
> Can you just add $(BLD)/unsetenv.$(O) to GNULIBOBJS
> in lib/makefile.w32-in, or something like that? No point in
> having two implementations of unsetenv.
I suspect the gnulib implementation won't work for Windows, for the
same reasons the original code you are replacing didn't: it messes
with the environ block, which is allocated on a heap that is different
from the heap used by Emacs. Even if we don't use the gnulib putenv
implementation, moving pointers in the environ block that belongs to
the Windows runtime library is something I'd like to avoid if
possible.
However, I have just installed in trunk revision 111156 changes that
add to w32.c an implementation of unsetenv, and a wrapper for putenv
that makes it more Posix-compliant. So you can now commit your
changes, and I believe they will work.
> I've attached a revised patch (sans any change to makefile.w32-in),
> relative to trunk bzr 111151.
Thanks.
> +void
> +xputenv (char const *string)
> +{
> + if (putenv ((char *) string) != 0)
> + memory_full (0);
> +}
Shouldn't we refrain from signaling memory_full when errno is EINVAL?
I'd suggest an eassert in that case. memory_full will emit a
misleading diagnostic.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-08 11:42 ` Eli Zaretskii
@ 2012-12-08 17:20 ` Paul Eggert
2012-12-08 18:31 ` Eli Zaretskii
0 siblings, 1 reply; 8+ messages in thread
From: Paul Eggert @ 2012-12-08 17:20 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 13070-done, fabrice.popineau
On 12/08/2012 03:42 AM, Eli Zaretskii wrote:
> Shouldn't we refrain from signaling memory_full when errno is EINVAL?
> I'd suggest an eassert in that case. memory_full will emit a
> misleading diagnostic.
errno cannot be EINVAL, at least not on a POSIXish host:
all strings are allowed as arguments to putenv.
If Microsoft platforms are different it would
make sense to put in an eassert, in w32.c presumably.
I did see a minor problem in the w32.c implementation of unsetenv:
/* MS docs says an environment variable cannot be longer than 32K. */
if (name_len > 32767)
{
errno = ENOMEM;
return -1;
}
unsetenv should return 0 in that case, not -1, since
the variable cannot possibly be in the environment.
This bug doesn't affect Emacs so it's not a pressing one.
I committed the patch as trunk bzr 111158 and am marking
this bug as fixed.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-08 17:20 ` Paul Eggert
@ 2012-12-08 18:31 ` Eli Zaretskii
2012-12-08 19:58 ` Paul Eggert
0 siblings, 1 reply; 8+ messages in thread
From: Eli Zaretskii @ 2012-12-08 18:31 UTC (permalink / raw)
To: Paul Eggert; +Cc: 13070, fabrice.popineau
> Date: Sat, 08 Dec 2012 09:20:57 -0800
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: fabrice.popineau@gmail.com, 13070-done@debbugs.gnu.org
>
> On 12/08/2012 03:42 AM, Eli Zaretskii wrote:
> > Shouldn't we refrain from signaling memory_full when errno is EINVAL?
> > I'd suggest an eassert in that case. memory_full will emit a
> > misleading diagnostic.
>
> errno cannot be EINVAL, at least not on a POSIXish host:
> all strings are allowed as arguments to putenv.
What about NULL pointers? Or strings without a '='? IMO, it's silly
to rely on unspecified behavior, but suit yourself.
> I did see a minor problem in the w32.c implementation of unsetenv:
>
> /* MS docs says an environment variable cannot be longer than 32K. */
> if (name_len > 32767)
> {
> errno = ENOMEM;
> return -1;
> }
>
> unsetenv should return 0 in that case, not -1, since
> the variable cannot possibly be in the environment.
Right, I fixed that.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#13070: Use putenv+unsetenv instead of modifying environ directly
2012-12-08 18:31 ` Eli Zaretskii
@ 2012-12-08 19:58 ` Paul Eggert
0 siblings, 0 replies; 8+ messages in thread
From: Paul Eggert @ 2012-12-08 19:58 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 13070, fabrice.popineau
On 12/08/2012 10:31 AM, Eli Zaretskii wrote:
> What about NULL pointers?
putenv typically dumps core when passed NULL,
so checking errno afterwards wouldn't help.
> Or strings without a '='?
Typically that's valid; it's equivalent to unsetenv.
So typically, checking errno afterwards wouldn't help.
> it's silly to rely on unspecified behavior
Emacs doesn't rely on unspecified behavior, since it never
passes NULL or '='-less strings to xputenv.
Emacs has many, many places where we could
put easserts, but we don't bother because the disadvantages
of code clutter outweigh any advantages of catching bugs,
and this appears to be one of those places.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2012-12-08 19:58 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-12-03 20:32 bug#13070: Use putenv+unsetenv instead of modifying environ directly Paul Eggert
2012-12-04 13:51 ` Fabrice Popineau
2012-12-04 17:48 ` Eli Zaretskii
2012-12-08 4:02 ` Paul Eggert
2012-12-08 11:42 ` Eli Zaretskii
2012-12-08 17:20 ` Paul Eggert
2012-12-08 18:31 ` Eli Zaretskii
2012-12-08 19:58 ` Paul Eggert
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