sysdeps/unix/sysv/linux/alpha/fdatasync.c

   1 /* fdatasync -- synchronize at least the data part of a file with
   2    the underlying media. Linux version.
   3
   4    Copyright (C) 2007-2015 Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library.  If not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <errno.h>
  22 #include <unistd.h>
  23
  24 #include <sysdep-cancel.h>
  25 #include <sys/syscall.h>
  26
  27 #include <kernel-features.h>
  28
  29 static int
  30 do_fdatasync (int fd)
  31 {
  32 #ifdef __ASSUME_FDATASYNC
  33   return INLINE_SYSCALL (fdatasync, 1, fd);
  34 #elif defined __NR_fdatasync
  35   static int __have_no_fdatasync;
  36
  37   if (!__builtin_expect (__have_no_fdatasync, 0))
  38     {
  39       int result = INLINE_SYSCALL (fdatasync, 1, fd);
  40       if (__builtin_expect (result, 0) != -1 || errno != ENOSYS)
  41         return result;
  42
  43       __have_no_fdatasync = 1;
  44     }
  45 #endif
  46   return INLINE_SYSCALL (fsync, 1, fd);
  47 }
  48
  49 int
  50 __fdatasync (int fd)
  51 {
  52   if (SINGLE_THREAD_P)
  53     return do_fdatasync (fd);
  54
  55   int oldtype = LIBC_CANCEL_ASYNC ();
  56
  57   int result = do_fdatasync (fd);
  58
  59   LIBC_CANCEL_RESET (oldtype);
  60
  61   return result;
  62 }
  63
  64 weak_alias (__fdatasync, fdatasync)