sysdeps/unix/sysv/linux/fallocate.c

   1 /* Copyright (C) 2007, 2009, 2011 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <sysdep-cancel.h>
  22
  23
  24 /* Reserve storage for the data of the file associated with FD.  */
  25 int
  26 fallocate (int fd, int mode, __off_t offset, __off_t len)
  27 {
  28 #ifdef __NR_fallocate
  29   if (SINGLE_THREAD_P)
  30     return INLINE_SYSCALL (fallocate, 6, fd, mode,
  31                            __LONG_LONG_PAIR (offset >> 31, offset),
  32                            __LONG_LONG_PAIR (len >> 31, len));
  33
  34   int result;
  35   int oldtype = LIBC_CANCEL_ASYNC ();
  36
  37   result = INLINE_SYSCALL (fallocate, 6, fd, mode,
  38                            __LONG_LONG_PAIR (offset >> 31, offset),
  39                            __LONG_LONG_PAIR (len >> 31, len));
  40
  41   LIBC_CANCEL_RESET (oldtype);
  42
  43   return result;
  44 #else
  45   __set_errno (ENOSYS);
  46   return -1;
  47 #endif
  48 }