ports/sysdeps/unix/sysv/linux/generic/wordsize-32/sendfile.c

   1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 <sys/sendfile.h>
  20 #include <errno.h>
  21
  22 /* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
  23    descriptor OUT_FD.  */
  24 ssize_t
  25 sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
  26 {
  27   __off64_t off64;
  28   int rc;
  29
  30   if (offset != NULL)
  31     {
  32       if (*offset < 0 || (off_t) (*offset + count) < 0)
  33         {
  34           __set_errno (EINVAL);
  35           return -1;
  36         }
  37       off64 = *offset;
  38     }
  39
  40   rc = INLINE_SYSCALL (sendfile64, 4, out_fd, in_fd,
  41                        offset ? &off64 : NULL, count);
  42   if (offset)
  43     *offset = off64;
  44   return rc;
  45 }