mq_close(2) [debian man page]

MQ_CLOSE(2)						      BSD System Calls Manual						       MQ_CLOSE(2)

NAME

     mq_close -- close a message queue (REALTIME)

LIBRARY

     POSIX Real-time Library (librt, -lrt)

SYNOPSIS

     #include <mqueue.h>

     int
     mq_close(mqd_t mqdes);

DESCRIPTION

     The mq_close() system call removes the association between the message queue descriptor, mqdes, and its message queue.  The results of using
     this message queue descriptor after successful return from this mq_close(), and until the return of this message queue descriptor from a sub-
     sequent mq_open(), are undefined.

     If the process has successfully attached a notification request to the message queue via this mqdes, this attachment will be removed, and the
     message queue is available for another process to attach for notification.

RETURN VALUES

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

ERRORS

     The mq_close() system call will fail if:

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

SEE ALSO

     mq_open(2), mq_unlink(2)

STANDARDS

     The mq_close() system call conforms to IEEE Std 1003.1-2004 (``POSIX.1'').

HISTORY

     Support for POSIX message queues first appeared in FreeBSD 7.0.

COPYRIGHT

     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 Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Elec-
     trical 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 referee document.  The original Standard can be obtained online at
	  http://www.opengroup.org/unix/online.html.

BSD
								 November 29, 2005							       BSD

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

NAME

     mq_getattr -- get message queue attributes (REALTIME)

LIBRARY

     POSIX Real-time Library (librt, -lrt)

SYNOPSIS

     #include <mqueue.h>

     int
     mq_getattr(mqd_t mqdes, struct mq_attr *mqstat);

DESCRIPTION

     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 referenced by the mqstat argument will be set to the current state of the
     message queue:

     mq_curmsgs  The number of messages currently on the queue.

RETURN VALUES

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

ERRORS

     The mq_getattr() system call will fail if:

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

SEE ALSO

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

STANDARDS

     The mq_getattr() system call conforms to IEEE Std 1003.1-2004 (``POSIX.1'').

HISTORY

     Support for POSIX message queues first appeared in FreeBSD 7.0.

COPYRIGHT

     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 Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Elec-
     trical 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 referee document.  The original Standard can be obtained online at
     http://www.opengroup.org/unix/online.html.

BSD
								 February 21, 2014							       BSD