问题 I can not find how to work properly with mq_timedreceive, can anyone give me an example? ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len, unsigned *msg_prio, const struct timespec *abs_timeout); I want timereceive to do not spent more than 20 seconds waiting. Thank you very much. 回答1: struct timespec tm; clock_gettime(CLOCK_REALTIME, &tm); tm.tv_sec += 20; // Set for 20 seconds if( 0 > mq_timedreceive( fd, buf, 4096, NULL, &tm ) ) { ... } Take a look at the full description