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mq_send(2)							    mq_send(2)

NAME
       mq_send - send a message to a message queue

SYNOPSIS
DESCRIPTION
       The  system  call  adds a message pointed to by the argument msg_ptr to
       the message queue specified by mqdes.  The msg_len  argument  specifies
       the length of the message in bytes. The value of msg_len should be less
       than or equal to the mq_msgsize attribute of the message queue, or will
       fail.

       If  the	specified  message  queue is not full, will insert the message
       into the queue at the position indicated by the	msg_prio  argument.  A
       message with priority, msg_prio, will be inserted behind any other mes‐
       sages with larger or equal priority.  The value of msg_prio  should  be
       less than

       If  the	specified message queue is full and the flag is not set in the
       message queue blocking status associated with mqdes, will block in pri‐
       ority  order,  until  it	 can  send a message on the queue, or until is
       interrupted by a signal.	 If the specified message queue	 is  full  and
       the  flag  is  set in the message queue blocking status associated with
       mqdes, the message will not be enqueued, and will return with an error.

       To use this function, link in the realtime library by specifying on the
       compiler or linker command line.

RETURN VALUE
       returns the following values:

	      Successful completion. The message is enqueued.

	      Failure.
		   is  set  to	indicate  the  error  and  the	message is not
		   enqueued.

ERRORS
       If fails, is set to one of the following values:

	      [EAGAIN]	     The flag is set in	 the  message  queue  blocking
			     status  associated	 with  mqdes,  and the message
			     queue is full.

	      [EBADF]	     mqdes is not a  valid  message  queue  descriptor
			     open for writing.

	      [EINTR]	     A signal interrupted the call to

	      [EINVAL]	     msg_ptr  points  to  an  invalid  address, or the
			     value of msg_prio is outside the valid range.

	      [EMSGSIZE]     The specified message  length,  msg_len,  exceeds
			     the message size attribute of the message queue.

	      [ENOSYS]	     is not supported by the implementation.

SEE ALSO
       mq_receive(2), mq_setattr(2), mq_getattr(2), sysconf(2).

STANDARDS CONFORMANCE
								    mq_send(2)

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