mq_close(3) [opendarwin man page]

MQ_CLOSE(3)						     Linux Programmer's Manual						       MQ_CLOSE(3)

NAME

       mq_close - close a message queue descriptor

SYNOPSIS

       #include <mqueue.h>

       int mq_close(mqd_t mqdes);

       Link with -lrt.

DESCRIPTION

       mq_close() closes the message queue descriptor mqdes.

       If  the	calling  process  has  attached  a  notification request (see (mq_notify(3)) to this message queue via mqdes, then this request is
       removed, and another process can now attach a notification request.

RETURN VALUE

       On success mq_close() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS

       EBADF  The message queue descriptor specified in mqdes is invalid.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+---------+
       |Interface  | Attribute	   | Value   |
       +-----------+---------------+---------+
       |mq_close() | Thread safety | MT-Safe |
       +-----------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       All open message queues are automatically closed on process termination, or upon execve(2).

SEE ALSO

       mq_getattr(3), mq_notify(3), mq_open(3), mq_receive(3), mq_send(3), mq_unlink(3), mq_overview(7)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							       MQ_CLOSE(3)

mq_close(3RT)						    Realtime Library Functions						     mq_close(3RT)

NAME

       mq_close - close a message queue

SYNOPSIS

       cc [ flag... ] file... -lrt [ library... ]
       #include <mqueue.h>

       int mq_close(mqd_t mqdes);

DESCRIPTION

       The  mq_close()	function  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
       subsequent mq_open(3RT), are undefined.

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

RETURN VALUES

       Upon successful completion, mq_close() returns 0; otherwise, the function returns -1 and sets errno to indicate the error condition.

ERRORS

       The  mq_close() function will fail if:

       EBADF	       The mqdes argument is an invalid message queue descriptor.

       ENOSYS	       The mq_open() function is not supported by the system.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mqueue.h(3HEAD), mq_notify(3RT), mq_open(3RT), mq_unlink(3RT), attributes(5), standards(5)

NOTES

       Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned
       -1 and set errno to ENOSYS.

SunOS 5.10							    28 Jun 2002 						     mq_close(3RT)