+
−/* Emulate fsync on platforms that lack it, primarily Windows and
+
−   cross-compilers like MinGW.
+
−
+
−   This is derived from sqlite3 sources.
+
−   http://www.sqlite.org/cvstrac/rlog?f=sqlite/src/os_win.c
+
−   http://www.sqlite.org/copyright.html
+
−
+
−   Written by Richard W.M. Jones <rjones.at.redhat.com>
+
−
+
−   Copyright (C) 2008-2011 Free Software Foundation, Inc.
+
−
+
−   This library is free software; you can redistribute it and/or
+
−   modify it under the terms of the GNU Lesser General Public
+
−   License as published by the Free Software Foundation; either
+
−   version 2.1 of the License, or (at your option) any later version.
+
−
+
−   This library is distributed in the hope that it will be useful,
+
−   but WITHOUT ANY WARRANTY; without even the implied warranty of
+
−   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+
−   Lesser General Public License for more details.
+
−
+
−   You should have received a copy of the GNU General Public License
+
−   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
−
+
−#include <config.h>
+
−#include <unistd.h>
+
−
+
−#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+
−
+
−/* FlushFileBuffers */
+
−# define WIN32_LEAN_AND_MEAN
+
−# include <windows.h>
+
−
+
−# include <errno.h>
+
−
+
−/* Get _get_osfhandle.  */
+
−# include "msvc-nothrow.h"
+
−
+
−int
+
−fsync (int fd)
+
−{
+
−  HANDLE h = (HANDLE) _get_osfhandle (fd);
+
−  DWORD err;
+
−
+
−  if (h == INVALID_HANDLE_VALUE)
+
−    {
+
−      errno = EBADF;
+
−      return -1;
+
−    }
+
−
+
−  if (!FlushFileBuffers (h))
+
−    {
+
−      /* Translate some Windows errors into rough approximations of Unix
+
−       * errors.  MSDN is useless as usual - in this case it doesn't
+
−       * document the full range of errors.
+
−       */
+
−      err = GetLastError ();
+
−      switch (err)
+
−        {
+
−          /* eg. Trying to fsync a tty. */
+
−        case ERROR_INVALID_HANDLE:
+
−          errno = EINVAL;
+
−          break;
+
−
+
−        default:
+
−          errno = EIO;
+
−        }
+
−      return -1;
+
−    }
+
−
+
−  return 0;
+
−}
+
−
+
−#else /* !Windows */
+
−
+
−# error "This platform lacks fsync function, and Gnulib doesn't provide a replacement. This is a bug in Gnulib."
+
−
+
−#endif /* !Windows */