hurd/fd-write.c

   1 /* _hurd_fd_write -- write to a file descriptor; handles job control et al.
   2    Copyright (C) 1993-2017 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23
  24 error_t
  25 _hurd_fd_write (struct hurd_fd *fd,
  26                 const void *buf, size_t *nbytes, loff_t offset)
  27 {
  28   error_t err;
  29   mach_msg_type_number_t wrote;
  30
  31   error_t writefd (io_t port)
  32     {
  33       return __io_write (port, buf, *nbytes, offset, &wrote);
  34     }
  35
  36   err = HURD_FD_PORT_USE (fd, _hurd_ctty_output (port, ctty, writefd));
  37
  38   if (! err)
  39     *nbytes = wrote;
  40
  41   return err;
  42 }