The corresponding descriptors in the parent.

After a fork(2), a child inherits copies of its parent's message queueĭescriptors, and these descriptors refer to the same open message queue descriptions as A processĬan request asynchronous notification of the arrival of a message on a previously emptyĪ message queue descriptor is a reference to an open message queue description (cf. Retrieved and (in some cases) modified using mq_getattr(3) and mq_setattr(3). Is no longer required, it can be deleted using mq_unlink(3). Process has finished using the queue, it closes it using mq_close(3), and when the queue Messages are transferred to and from a queue using mq_send(3) and mq_receive(3). On the same queue by passing the same name to mq_open(3). Terminated string of up to NAME_MAX (i.e., 255) characters consisting of an initial slash,įollowed by one or more characters, none of which are slashes. Message queues are created and opened using mq_open(3) this function returns a message queue descriptor ( mqd_t), which is used to refer to the open message queue in later calls.Įach message queue is identified by a name of the form /somename that is, a null. Msgrcv(2), etc.), but provides similar functionality. Is distinct from that provided by System V message queues ( msgget(2), msgsnd(2), POSIX message queues allow processes to exchange data in the form of messages.

Mq_overview - overview of POSIX message queues

Linux message queue