/* * 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 inline _syscall5(int, __syscall_mq_timedreceive, int, mqdes, char *, msg_ptr, size_t, msg_len, unsigned int *, msg_prio, const void *, abs_timeout); #endif /* * 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) { #ifdef __NR_mq_timedreceive return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, abs_timeout); #else errno = ENOSYS; return -1; #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 mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, NULL); }