2.9 POSIX Message Queues

The mq_open() system call establishes the connection between an actor and a message queue with a message queue descriptor. In the ChorusOS 3.2 operating system, the identifier returned by mq_open() was from an identifier space specific to the POSIX message queue. In the ChorusOS 4.0 operating system, this identifier is a standard file descriptor, similar to the file descriptor returned by open(), as stated in the POSIX standard.

See the mq_open(2POSIX) man page for more information.