uclibc-ng/librt/mq_receive.c

/*
 * mq_receive.c - functions for receiving from message queue.
 */

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

#ifdef __NR_mq_timedreceive
#define __NR___syscall_mq_timedreceive __NR_mq_timedreceive
static _syscall5(int, __syscall_mq_timedreceive, int, mqdes,
		 char *, msg_ptr, size_t, msg_len, unsigned int *,
		 msg_prio, const void *, abs_timeout)
# if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
/*
 * Receive the oldest from highest priority messages.
 * Stop waiting if abs_timeout expires.
 */
ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
			unsigned int *msg_prio,
			const struct timespec *abs_timeout)
{
	return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio,
					 abs_timeout);
}
# endif

/* Receive the oldest from highest priority messages */
ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
		   unsigned int *msg_prio)
{
	return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, NULL);
}
#elif defined __UCLIBC_HAS_STUBS__
# if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
ssize_t mq_timedreceive(mqd_t mqdes attribute_unused, char *msg_ptr attribute_unused,
			size_t msg_len attribute_unused, unsigned int *msg_prio attribute_unused,
			const struct timespec *abs_timeout attribute_unused)
{
	__set_errno(ENOSYS);
	return -1;
}
# endif
ssize_t mq_receive(mqd_t mqdes attribute_unused, char *msg_ptr attribute_unused,
		   size_t msg_len attribute_unused, unsigned int *msg_prio attribute_unused)
{
	__set_errno(ENOSYS);
	return -1;
}
#endif