uclibc-ng/librt/mq_notify.c

/*
 * mq_notify.c - notify process that a message is available.
 */

#include <errno.h>
#include <stddef.h>
#include <sys/syscall.h>

#include <mqueue.h>

#ifdef __NR_mq_notify

#define __NR___syscall_mq_notify __NR_mq_notify
static inline _syscall2(int, __syscall_mq_notify, int, mqdes,
	const void *, notification);

/* Register notification upon message arrival to an empty message queue */
int mq_notify(mqd_t mqdes, const struct sigevent *notification)
{
    /* We don't support SIGEV_THREAD notification yet */
    if (notification != NULL && notification->sigev_notify == SIGEV_THREAD) {
	__set_errno(ENOSYS);
	return -1;
    }
    return __syscall_mq_notify(mqdes, notification);
}

#endif