librt/mq_notify.c

   1 /*
   2  * mq_notify.c - notify process that a message is available.
   3  */
   4
   5 #include <errno.h>
   6 #include <stddef.h>
   7 #include <sys/syscall.h>
   8
   9 #include <mqueue.h>
  10
  11 #ifdef __NR_mq_notify
  12
  13 #define __NR___syscall_mq_notify __NR_mq_notify
  14 static __inline__ _syscall2(int, __syscall_mq_notify, int, mqdes,
  15                         const void *, notification);
  16
  17 /* Register notification upon message arrival to an empty message queue */
  18 int mq_notify(mqd_t mqdes, const struct sigevent *notification)
  19 {
  20         /* We don't support SIGEV_THREAD notification yet */
  21         if (notification != NULL && notification->sigev_notify == SIGEV_THREAD) {
  22                 __set_errno(ENOSYS);
  23                 return -1;
  24         }
  25         return __syscall_mq_notify(mqdes, notification);
  26 }
  27
  28 #endif