4132bd74e9
This incorporates: 2017-05-13 largefile: Simplify 2017-05-13 largefile: Improve and document 2017-05-13 truncate: New module 2017-05-13 windows-stat-timespec: New module 2017-05-13 windows-stat-override: New module 2017-05-11 getopt-posix: port to mingw 2017-05-11 gettimeofday: Increase precision on mingw 2017-05-10 time: Fix missing initialization of HAVE_TIMEZONE_T 2017-05-10 Implement a way to opt out from MSVC support 2017-05-09 tzset: Expand comment about TZ problem on native Windows * build-aux/config.guess, lib/dup2.c, lib/fcntl.c, lib/fsync.c: * lib/getdtablesize.c, lib/getopt.c, lib/gettimeofday.c: * lib/mktime.c, lib/stat-time.h, lib/sys_stat.in.h, lib/unistd.in.h: * lib/utimens.c, m4/gettimeofday.m4, m4/largefile.m4: * m4/sys_stat_h.m4, m4/sys_time_h.m4, m4/time_h.m4, m4/time_rz.m4: * m4/unistd_h.m4: Copy from gnulib. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
87 lines
2.3 KiB
C
87 lines
2.3 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) 2008-2017 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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# if GNULIB_MSVC_NOTHROW
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# include "msvc-nothrow.h"
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# else
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# include <io.h>
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# endif
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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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