Linux-only fdatasync() in 3c13bc

[Xīcò <xico@atelo.org>]

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Also, commit 3c13bc introduced a call to fdatasync() which is not
available on FreeBSD, and probably not either on MacOS at least.

Best,

--
Xīcò

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From e2b9520e69e52b35348d07eb53a6a88d1397fa3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?X=C4=ABc=C3=B2?= <xico@atelo.org>
Date: Tue, 6 May 2014 12:56:03 -0700
Subject: [PATCH 1/1] =?UTF-8?q?Compatibility=20for=20Linux=E2=80=99s=20fda?=
 =?UTF-8?q?tasync().?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 configure      | 7 +++++++
 notmuch-dump.c | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/configure b/configure
index 7204812..7bc602d 100755
--- a/configure
+++ b/configure
@@ -271,6 +271,7 @@ EOF
 errors=0
 
 libdir_in_ldconfig=0
+have_fdatasync=0
 
 printf "Checking which platform we are on... "
 uname=`uname`
@@ -294,6 +295,7 @@ elif [ $uname = "Linux" ] || [ $uname = "GNU" ] ; then
     printf "$uname\n"
     platform="$uname"
     linker_resolves_library_dependencies=1
+    have_fdatasync=1
 
     printf "Checking for $libdir_expanded in ldconfig... "
     ldconfig_paths=$(/sbin/ldconfig -N -X -v 2>/dev/null | sed -n -e 's,^\(/.*\):\( (.*)\)\?$,\1,p')
@@ -859,6 +861,9 @@ HAVE_D_TYPE = ${have_d_type}
 # Whether the Xapian version in use supports compaction
 HAVE_XAPIAN_COMPACT = ${have_xapian_compact}
 
+# Optimized fsync() on Linux
+HAVE_FDATASYNC = ${have_fdatasync}
+
 # Whether the getpwuid_r function is standards-compliant
 # (if not, then notmuch will #define _POSIX_PTHREAD_SEMANTICS
 # to enable the standards-compliant version -- needed for Solaris)
@@ -926,6 +931,7 @@ CONFIGURE_CFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)      \\
 		   -DSTD_GETPWUID=\$(STD_GETPWUID)                       \\
 		   -DSTD_ASCTIME=\$(STD_ASCTIME)                         \\
 		   -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)	 \\
+		   -DHAVE_FDATASYNC=\$(HAVE_FDATASYNC)	                 \\
 		   -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)
 
 CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)    \\
@@ -939,6 +945,7 @@ CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)    \\
 		     -DSTD_GETPWUID=\$(STD_GETPWUID)                     \\
 		     -DSTD_ASCTIME=\$(STD_ASCTIME)                       \\
 		     -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)       \\
+		     -DHAVE_FDATASYNC=\$(HAVE_FDATASYNC)	         \\
 		     -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)
 
 CONFIGURE_LDFLAGS =  \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(ZLIB_LDFLAGS) \$(XAPIAN_LDFLAGS)
diff --git a/notmuch-dump.c b/notmuch-dump.c
index 2849eab..86b275a 100644
--- a/notmuch-dump.c
+++ b/notmuch-dump.c
@@ -169,7 +169,11 @@ notmuch_database_dump (notmuch_database_t *notmuch,
     }
 
     if (output_file_name) {
+#if HAVE_FDATASYNC
 	ret = fdatasync (outfd);
+#else
+	ret = fsync (outfd);
+#endif
 	if (ret) {
 	    fprintf (stderr, "Error syncing %s to disk: %s\n",
 		     name_for_error, strerror (errno));
-- 
1.9.2