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mq_setattr(2)							 mq_setattr(2)

NAME
       mq_setattr - set the blocking status of a message queue associated with
       a descriptor

SYNOPSIS
DESCRIPTION
       The system call changes the blocking status of a message queue  associ‐
       ated  with the descriptor, mqdes.  The blocking status that is modified
       is per message queue descriptor and another  open  descriptor  for  the
       same message queue can have a different blocking status.

       The argument mqstat, points to an structure that specifies the blocking
       status desired. More specifically, if the bit in the mq_flags field  of
       the  structure is set, the descriptor is marked as non-blocking. Other‐
       wise it is marked as blocking.

       If omstat is non-NULL, will store in the structure referenced by	 omqs‐
       tat,  the previous message queue attributes and the queue blocking sta‐
       tus associated with this mqdes.	The values returned are	 the  same  as
       would be returned by a call to

       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.

	      Failure.
		   is set to indicate the error.

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

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

	      [EINVAL]	     mqstat does not point to a	 valid	structure,  or
			     omqstat is non-NULL and does not point to a valid
			     structure.

	      [ENOSYS]	     is not supported by the implementation.

SEE ALSO
       mq_getattr(2), mq_open(2).

STANDARDS CONFORMANCE
								 mq_setattr(2)

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