view lib/fsync.c @ 15727:144db791c6fa

Ensure EBADF returns for socket functions on mingw. * lib/accept.c (rpl_accept): Fail with error EBADF if the file descriptor is invalid. * lib/bind.c (rpl_bind): Likewise. * lib/connect.c (rpl_connect): Likewise. * lib/getpeername.c (rpl_getpeername): Likewise. * lib/getsockname.c (rpl_getsockname): Likewise. * lib/getsockopt.c (rpl_getsockopt): Likewise. * lib/listen.c (rpl_listen): Likewise. * lib/recv.c (rpl_recv): Likewise. * lib/recvfrom.c (rpl_recvfrom): Likewise. * lib/send.c (rpl_send): Likewise. * lib/sendto.c (rpl_sendto): Likewise. * lib/setsockopt.c (rpl_setsockopt): Likewise. * lib/shutdown.c (rpl_shutdown): Likewise.
author Bruno Haible <bruno@clisp.org>
date Wed, 21 Sep 2011 00:20:59 +0200
parents 2330aac2ae54
children b86e9061a6d0
line wrap: on
line source

/* 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__

/* _get_osfhandle */
# include <io.h>

/* FlushFileBuffers */
# define WIN32_LEAN_AND_MEAN
# include <windows.h>

# include <errno.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 */