The mq_setattr() function is used to set attributes associated with the open message queue description referenced by the message queue descriptor specified by mqdes.
The message queue attributes corresponding to the following members defined in the mq_attr structure are set to the specified values upon successful completion of mq_setattr():
-
mq_flags
- The value of this member is either 0 or O_NONBLOCK.
The values of mq_maxmsg, mq_msgsize, and mq_curmsgs are ignored by mq_setattr().
If omqstat is non-NULL, mq_setattr() stores, in the location referenced by omqstat, the previous
message queue attributes and the current queue status. These values are the same as would be returned by a call to mq_getattr() at that point.
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