/* sendfile -- copy data directly from one file descriptor to another

   Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sys/sendfile.h>

#include <stddef.h>

/* Send COUNT bytes from file associated with IN_FD starting at OFFSET to

   descriptor OUT_FD.  */

ssize_t

sendfile (int out_fd, int in_fd, off_t *offset, size_t count)

{

  if (offset == NULL || sizeof (off_t) == sizeof (off64_t))

    return __sendfile64 (out_fd, in_fd, (off64_t *) offset, count);

  else

    {

      off64_t ofs = *offset;

      ssize_t ret = __sendfile64 (out_fd, in_fd, &ofs, count);

      *offset = ofs;

      return ret;

    }

}