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1. Programming
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)
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3. Solaris
Hi Folks,
When i execute the command df -kh in my system the o/p hangs..
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4. Programming
Hi all,
First of all thanks in advance for reading my post and for your heart for helping me.
I am trying to create a message queue using mq_open(name,oflags,mode_t,attr) method. But that function call is returning with an error code EFAULT. By googling it I found that it happens when there is... (10 Replies)
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5. UNIX for Dummies Questions & Answers
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6. Shell Programming and Scripting
ok... this is where i am at... i need a script to call another script as a wrapper because the first script creates a sub-shell.
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8. Programming
Hi,
Am creating a msgqueue using mq_open
</code>
main()
{
struct mq_attr attr; /* message queue attributes structure */
memset(&_attr,0,sizeof(struct mq_attr));
attr.mq_maxmsg= 10;
attr.mq_msgsize= 20;
msg.flag = HS_FWK_MSGQ_FLAGS;... (2 Replies)
Discussion started by: rvan
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9. UNIX for Advanced & Expert Users
On True64 UNIX, in a process, how many message queues can be open and how to increase it if the value has been out of the system limits. In our program, we want to create 1000 message queues,the mq_open returns the error message "too many open files".thanks (3 Replies)
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10. HP-UX
Hello,
J work on a HP.
I want to create message queue by using mq_open with this parameters:
mq_open(p,O_CREAT|O_WRONLY|O_EXCL|0_NONBLOCK,0600,&queue_attr)
with p char
and the function returns the value -1 and errno equal 2.
can you help me ?
Thank. (3 Replies)
Discussion started by: AUBERT
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MQ_UNLINK(3P) POSIX Programmer's Manual MQ_UNLINK(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_unlink - remove a message queue (REALTIME)
SYNOPSIS
#include <mqueue.h>
int mq_unlink(const char *name);
DESCRIPTION
The mq_unlink() function shall remove the message queue named by the pathname name. After a successful call to mq_unlink() with name, a
call to mq_open() with name shall fail if the flag O_CREAT is not set in flags. If one or more processes have the message queue open when
mq_unlink() is called, destruction of the message queue shall be postponed until all references to the message queue have been closed.
Calls to mq_open() to recreate the message queue may fail until the message queue is actually removed. However, the mq_unlink() call need
not block until all references have been closed; it may return immediately.
RETURN VALUE
Upon successful completion, the function shall return a value of zero. Otherwise, the named message queue shall be unchanged by this func-
tion call, and the function shall return a value of -1 and set errno to indicate the error.
ERRORS
The mq_unlink() function shall fail if:
EACCES Permission is denied to unlink the named message queue.
ENAMETOOLONG
The length of the name argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.
ENOENT The named message queue does not exist.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
mq_close(), mq_open(), 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_UNLINK(3P)