sysdeps/unix/sysv/linux/sync_file_range.c

   1 /* Selective file content synch'ing.
   2    Copyright (C) 2006-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <sys/types.h>
  22
  23 #include <sysdep-cancel.h>
  24 #include <sys/syscall.h>
  25
  26
  27 #ifdef __NR_sync_file_range
  28 int
  29 sync_file_range (int fd, __off64_t from, __off64_t to, unsigned int flags)
  30 {
  31   if (SINGLE_THREAD_P)
  32     return INLINE_SYSCALL (sync_file_range, 6, fd,
  33                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  34                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to),
  35                            flags);
  36
  37   int result;
  38   int oldtype = LIBC_CANCEL_ASYNC ();
  39
  40   result = INLINE_SYSCALL (sync_file_range, 6, fd,
  41                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  42                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to),
  43                            flags);
  44
  45   LIBC_CANCEL_RESET (oldtype);
  46
  47   return result;
  48 }
  49 #elif defined __NR_sync_file_range2
  50 int
  51 sync_file_range (int fd, __off64_t from, __off64_t to, unsigned int flags)
  52 {
  53   if (SINGLE_THREAD_P)
  54     return INLINE_SYSCALL (sync_file_range2, 6, fd, flags,
  55                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  56                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to));
  57
  58   int result;
  59   int oldtype = LIBC_CANCEL_ASYNC ();
  60
  61   result = INLINE_SYSCALL (sync_file_range2, 6, fd, flags,
  62                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  63                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to));
  64
  65   LIBC_CANCEL_RESET (oldtype);
  66
  67   return result;
  68 }
  69 #else
  70 int
  71 sync_file_range (int fd, __off64_t from, __off64_t to, unsigned int flags)
  72 {
  73   __set_errno (ENOSYS);
  74   return -1;
  75 }
  76 stub_warning (sync_file_range)
  77 #endif