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47d7532e09
* 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
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* Emulate fsync on platforms that lack it, primarily Windows and
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cross-compilers like MinGW.
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This is derived from sqlite3 sources.
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http://www.sqlite.org/cvstrac/rlog?f=sqlite/src/os_win.c
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http://www.sqlite.org/copyright.html
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Written by Richard W.M. Jones <rjones.at.redhat.com>
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Copyright (C) 2008-2013 Free Software Foundation, Inc.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <unistd.h>
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* FlushFileBuffers */
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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# include <errno.h>
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/* Get _get_osfhandle. */
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# include "msvc-nothrow.h"
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int
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fsync (int fd)
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{
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HANDLE h = (HANDLE) _get_osfhandle (fd);
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DWORD err;
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if (h == INVALID_HANDLE_VALUE)
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{
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errno = EBADF;
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return -1;
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}
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if (!FlushFileBuffers (h))
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{
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/* Translate some Windows errors into rough approximations of Unix
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* errors. MSDN is useless as usual - in this case it doesn't
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* document the full range of errors.
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*/
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err = GetLastError ();
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switch (err)
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{
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case ERROR_ACCESS_DENIED:
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/* For a read-only handle, fsync should succeed, even though we have
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no way to sync the access-time changes. */
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return 0;
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/* eg. Trying to fsync a tty. */
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case ERROR_INVALID_HANDLE:
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errno = EINVAL;
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break;
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default:
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errno = EIO;
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}
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return -1;
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}
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return 0;
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}
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#else /* !Windows */
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# error "This platform lacks fsync function, and Gnulib doesn't provide a replacement. This is a bug in Gnulib."
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#endif /* !Windows */
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