|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.1‐2008, <mqueue.h>
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
|2013||IEEE/The Open Group|