|MQ_SETATTR(3P)||POSIX Programmer's Manual||MQ_SETATTR(3P)|
int mq_setattr(mqd_t mqdes, const struct mq_attr *restrict mqstat, struct mq_attr *restrict omqstat);
The message queue attributes corresponding to the following members defined in the mq_attr structure shall be set to the specified values upon successful completion of mq_setattr():
- The value of this member is the bitwise-logical OR of zero or more of O_NONBLOCK and any implementation-defined flags.
The values of the mq_maxmsg, mq_msgsize, and mq_curmsgs members of the mq_attr structure shall be ignored by mq_setattr().
If omqstat is non-NULL, the mq_setattr() function shall store, in the location referenced by omqstat, the previous message queue attributes and the current queue status. These values shall be the same as would be returned by a call to mq_getattr() at that point.
Otherwise, the message queue attributes shall be unchanged, and the function shall return a value of -1 and set errno to indicate the error.
- The mqdes argument is not a valid message queue descriptor.
The following sections are informative.
The Base Definitions volume of POSIX.1‐2017, <mqueue.h>
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|2017||IEEE/The Open Group|