File synchronization fixes.

* admin/CPP-DEFINES (BSD_SYSTEM, HAVE_FSYNC): Remove.
* admin/merge-gnulib (GNULIB_MODULES): Add fsync, fdatasync.
* configure.ac (BSD_SYSTEM, BSD_SYSTEM_AHB): Remove; no longer needed.
(fsync): Remove check; now done by gnulib.
* lib/fdatasync.c, lib/fsync.c, m4/fdatasync.m4, m4/fsync.m4:
New files, from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* lib-src/Makefile.in (LIB_FDATASYNC): New macro.
(emacsclient${EXEEXT}): Use it.
* lib-src/emacsclient.c (main): Use fdatasync, not fsync, since we don't
care about metadata.  Keep trying if interrupted.
* lib-src/movemail.c (main, popmail): Don't worry about BSD_SYSTEM, since
fsync is available everywhere (or there is a substitute).  Don't
report an error if fsync returns EINVAL.
* nt/inc/ms-w32.h (fdatasync): New macro, suggested by Eli Zaretskii.
* src/Makefile.in (LIB_FDATASYNC): New macro.
(LIBES): Use it.
* src/conf_post.h (BSD_SYSTEM, BSD_SYSTEM_AHB): Remove; no longer needed.
* src/fileio.c (Fwrite_region, write_region_inhibit_fsync):
Don't worry about HAVE_FSYNC, since a substitute fsync is
available if the system lacks one.
(Fwrite_regin): Retry fsync if interrupted.

Fixes: debbugs:13944

2 files changed, 6 insertions, 0 deletions

diff --git a/nt/ChangeLog b/nt/ChangeLog
index dcda682cfc6..48c1cb8bc82 100644
--- a/nt/ChangeLog
+++ b/nt/ChangeLog
@@ -1,3 +1,8 @@
+2013-03-13  Paul Eggert  <eggert@cs.ucla.edu>
+
+        File synchronization fixes (Bug#13944).
+        * inc/ms-w32.h (fdatasync): New macro, suggested by Eli Zaretskii.
+
 2013-03-05  Paul Eggert  <eggert@cs.ucla.edu>
 
         FILE's lock is now always .#FILE and may be a regular file (Bug#13807).
diff --git a/nt/inc/ms-w32.h b/nt/inc/ms-w32.h
index 9473fbe3ca6..12402390895 100644
--- a/nt/inc/ms-w32.h
+++ b/nt/inc/ms-w32.h
@@ -220,6 +220,7 @@ extern int sys_unlink (const char *);
 /* Map to MSVC names.  */
 #define execlp    _execlp
 #define execvp    _execvp
+#define fdatasync _commit
 #define fdopen    _fdopen
 #ifndef fileno
 #define fileno    _fileno