sysdeps/unix/sysv/linux/mq_notify.c

   1 /* Copyright (C) 2004, 2005 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <mqueue.h>
  20 #include <stddef.h>
  21 #include <sysdep.h>
  22
  23 #ifdef __NR_mq_notify
  24
  25 /* Register notification upon message arrival to an empty message queue
  26    MQDES.  */
  27 int
  28 mq_notify (mqd_t mqdes, const struct sigevent *notification)
  29 {
  30   /* mq_notify which handles SIGEV_THREAD is included in the thread
  31      add-on.  */
  32   if (notification != NULL
  33       && notification->sigev_notify == SIGEV_THREAD)
  34     {
  35       __set_errno (ENOSYS);
  36       return -1;
  37     }
  38   return INLINE_SYSCALL (mq_notify, 2, mqdes, notification);
  39 }
  40
  41 #else
  42 # include <rt/mq_notify.c>
  43 #endif