sysdeps/unix/sysv/linux/sync_file_range.c

   1 /* Selective file content synch'ing.
   2    Copyright (C) 2006, 2007, 2009, 2011 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <sys/types.h>
  23
  24 #include <sysdep-cancel.h>
  25 #include <sys/syscall.h>
  26
  27
  28 #ifdef __NR_sync_file_range
  29 int
  30 sync_file_range (int fd, __off64_t from, __off64_t to, unsigned int flags)
  31 {
  32   if (SINGLE_THREAD_P)
  33     return INLINE_SYSCALL (sync_file_range, 6, fd,
  34                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  35                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to),
  36                            flags);
  37
  38   int result;
  39   int oldtype = LIBC_CANCEL_ASYNC ();
  40
  41   result = INLINE_SYSCALL (sync_file_range, 6, fd,
  42                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  43                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to),
  44                            flags);
  45
  46   LIBC_CANCEL_RESET (oldtype);
  47
  48   return result;
  49 }
  50 #elif defined __NR_sync_file_range2
  51 int
  52 sync_file_range (int fd, __off64_t from, __off64_t to, unsigned int flags)
  53 {
  54   if (SINGLE_THREAD_P)
  55     return INLINE_SYSCALL (sync_file_range2, 6, fd, flags,
  56                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  57                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to));
  58
  59   int result;
  60   int oldtype = LIBC_CANCEL_ASYNC ();
  61
  62   result = INLINE_SYSCALL (sync_file_range2, 6, fd, flags,
  63                            __LONG_LONG_PAIR ((long) (from >> 32), (long) from),
  64                            __LONG_LONG_PAIR ((long) (to >> 32), (long) to));
  65
  66   LIBC_CANCEL_RESET (oldtype);
  67
  68   return result;
  69 }
  70 #else
  71 int
  72 sync_file_range (int fd, __off64_t from, __off64_t to, unsigned int flags)
  73 {
  74   __set_errno (ENOSYS);
  75   return -1;
  76 }
  77 stub_warning (sync_file_range)
  78
  79 # include <stub-tag.h>
  80 #endif