Hi, both prototypes (I'l looking in the web pages, like http://man7.org/linux/man-pages/man2/mq_timedsend.2.html) reports "unsigned msg_prio" as msg_prio parameter type, but definition inside /usr/include/mqueue.h use (for esample for mq_timedreceive) unsigned int __msg_prio Regards Simone -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html