mq_getattr man page on FreeBSD

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MQ_GETATTR(2)		    BSD System Calls Manual		 MQ_GETATTR(2)

     mq_getattr — get message queue attributes (REALTIME)

     POSIX Real-time Library (librt, -lrt)

     #include <mqueue.h>

     mq_getattr(mqd_t mqdes, struct mq_attr *mqstat);

     The mq_getattr() system call obtains status information and attributes of
     the message queue and the open message queue description associated with
     the message queue descriptor.

     The mqdes argument specifies a message queue descriptor.

     The results are returned in the mq_attr structure referenced by the
     mqstat argument.

     Upon return, the following members will have the values associated with
     the open message queue description as set when the message queue was
     opened and as modified by subsequent mq_setattr() calls: mq_flags.

     The following attributes of the message queue will be returned as set at
     message queue creation: mq_maxmsg, mq_msgsize.

     Upon return, the following members within the mq_attr structure refer‐
     enced by the mqstat argument will be set to the current state of the mes‐
     sage queue:

     mq_flags  The number of messages currently on the queue.

     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the

     The mq_getattr() system call will fail if:

     [EBADF]		The mqdes argument is not a valid message queue

     mq_open(2), mq_send(2), mq_setattr(2), mq_timedsend(2)

     The mq_getattr() system call conforms to IEEE Std 1003.1-2004

     Support for POSIX message queues first appeared in FreeBSD 7.0.

     Portions of this text are reprinted and reproduced in electronic form
     from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology
     -- Portable Operating System Interface (POSIX), The Open Group Base Spec‐
     ifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electri‐
     cal and Electronics Engineers, Inc and The Open Group.  In the event of
     any discrepancy between this version and the original IEEE and The Open
     Group Standard, the original IEEE and The Open Group Standard is the ref‐
     eree document.  The original Standard can be obtained online at

BSD			       November 29, 2005			   BSD

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