mq_close(3p) [centos man page]

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)

MQ_GETATTR(3P)						     POSIX Programmer's Manual						    MQ_GETATTR(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_getattr - get message queue attributes (REALTIME)

SYNOPSIS

       #include <mqueue.h>

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

DESCRIPTION

       The mq_getattr() function shall obtain status information and attributes of the message queue and the open message queue description  asso-
       ciated with the message queue descriptor.

       The mqdes argument specifies a message queue descriptor.

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

       Upon  return,  the following members shall 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 shall 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 shall be set to the current state of  the
       message queue:

       mq_curmsgs
	      The number of messages currently on the queue.

RETURN VALUE

       Upon  successful completion, the mq_getattr() function shall return zero. Otherwise, the function shall return -1 and set errno to indicate
       the error.

ERRORS

       The mq_getattr() 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_send(),  mq_setattr(),  mq_timedsend(),  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_GETATTR(3P)