MQ_CLOSE(3) BSD Library Functions Manual MQ_CLOSE(3)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() function will remove the association between the message queue descriptor, mqdes, and its message queue.
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
The mq_close() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
cate the error.
ERRORS
The mq_close() function fails if:
[EBADF] The mqdes argument is not a valid message queue descriptor.
SEE ALSO mq(3), mq_open(3), mq_unlink(3)STANDARDS
This function conforms to the IEEE Std 1003.1-2001 (``POSIX.1'') standard.
HISTORY
The mq_close() function first appeared in NetBSD 5.0.
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 June 7, 2010 BSD
Check Out this Related 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
Hello,
J have a problem when I use gcc:
This comand works:
gcc -shared -fpic -I/usr/include/sys -I/usr/include -L/usr/lib/librt.sl essai1.c mylib.sl
but
gcc I/usr/include/sys -I/usr/include -L/usr/lib/librt.sl essai2.c -o essai
don't work.
The first command creates a dynamique... (1 Reply)
hi
I am using posix functions such as mq_open, mq_close and including the mqueue.h. but its giving a linking error,"undefined reference to mq_open and mq_close".
it it that we have to link some library or so while compiling... plzzz help
Thanxs
Mohit (0 Replies)
Hi guys.
i have wrote a simple program to test message queue attributes. here it is:
#include <stdio.h>
#include <stdlib.h>
#include <mqueue.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
int main()
{
struct mq_attr attr;
mqd_t mqd;
... (2 Replies)
Hi All,
First of all thanks for reading this post.
In my application, I am trying to create a new message queue . I am attaching the code below.
mqd_t mqopen2(const char * pName,
unsigned long Flags,
long maxMsg,
long msgSz)
{... (15 Replies)
hello, I try to test the POSIX mq_open function on book unp like below:
#include "unpipc.h"
# include <mqueue.h>
int main(int argc, char **argv)
{
int c, flags;
mqd_t mqd;
flags = O_RDWR | O_CREAT;
while ((c = getopt(argc, argv, "e")) != -1) {
... (3 Replies)