88 lines
2.3 KiB
C
88 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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https://www.sqlite.org/src/finfo?name=src/os_win.c
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https://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) 2008-2022 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://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 __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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