mq_close(3) [x11r4 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(3P)						     POSIX Programmer's Manual						      MQ_CLOSE(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       mq_close - close a message queue (REALTIME)

SYNOPSIS

       #include <mqueue.h>

       int mq_close(mqd_t mqdes);

DESCRIPTION

       The mq_close() function shall remove 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(), are undefined.

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

RETURN VALUE

       Upon  successful  completion,  the mq_close() function shall return a value of zero; otherwise, the function shall return a value of -1 and
       set errno to indicate the error.

ERRORS

       The mq_close() function shall fail if:

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

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       mq_open(), mq_unlink(), msgctl(), msgget(), msgrcv(), msgsnd(), the Base Definitions volume of IEEE Std 1003.1-2001, <mqueue.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical 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 .

IEEE
/The Open Group						       2003							      MQ_CLOSE(3P)