10 More Discussions You Might Find Interesting
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)
Discussion started by: anpufeng
3 Replies
2. Shell Programming and Scripting
Hey folks. Long time lurker, first time poster. I'm a bit of a newbie at "coding" (obviously, scripting is a teensy bit different than coding) and I've run into a problem that I just can't seem to get around.
I'm going through a list of servers to check their name, IP, reverse-NSLOOKUP name and... (2 Replies)
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2 Replies
3. Solaris
Hi Folks,
When i execute the command df -kh in my system the o/p hangs..
The command runs fine but takes a lot of time before coming back to the # prompt.
Can anyone please suggest the possible cause and solution?. (10 Replies)
Discussion started by: vivek.goel.piet
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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)
Discussion started by: parusasi
10 Replies
5. UNIX for Dummies Questions & Answers
Hi! I have written a program three threads will be created to execute three different Sybase SQLs. so three thread will call a method runQuery.
In run query again we create child process to execute the actuall SQL by connecting to the SQL. When I run the process first three threading working fine.... (0 Replies)
Discussion started by: jramesh1
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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.
here is what i got... i kick off the first script "CCBDEMO-threadpoolworker.sh"
#!/bin/bash
clear #clearing screen
directory="/data1/spl/cis/CCBDEMO/bin"... (1 Reply)
Discussion started by: Dagaswolf
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7. UNIX for Dummies Questions & Answers
Ok, this question my be different. I can ping our unix box, but when we I to access the webpage I cant. To access the webpage I type http://ipaddress:some port. How do I check if a port is hanging and how would I un hang it. Sorry if question doesnt make sense. (1 Reply)
Discussion started by: NycUnxer
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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
2 Replies
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)
Discussion started by: Frank2004
3 Replies
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
3 Replies
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