sysdeps/mach/hurd/sendfile.c

   1 /* sendfile -- copy data directly from one file descriptor to another
   2    Copyright (C) 2002 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 <sys/sendfile.h>
  21 #include <stddef.h>
  22
  23 /* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
  24    descriptor OUT_FD.  */
  25 ssize_t
  26 sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
  27 {
  28   if (offset == NULL || sizeof (off_t) == sizeof (off64_t))
  29     return sendfile64 (out_fd, in_fd, (off64_t *) offset, count);
  30   else
  31     {
  32       off64_t ofs = *offset;
  33       ssize_t ret = sendfile64 (out_fd, in_fd, &ofs, count);
  34       *offset = ofs;
  35       return ret;
  36     }
  37 }