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
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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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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
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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(3C) Standard C Library Functions mq_close(3C)
NAME
mq_close - close a message queue
SYNOPSIS
#include <mqueue.h>
int mq_close(mqd_t mqdes);
DESCRIPTION
The mq_close() function 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
subsequent mq_open(3C), are undefined.
If the process (or thread) has successfully attached a notification request to the message queue via this mqdes, this attachment is removed
and the message queue is available for another process to attach for notification.
RETURN VALUES
Upon successful completion, mq_close() returns 0; otherwise, the function returns -1 and sets errno to indicate the error condition.
ERRORS
The mq_close() function will fail if:
EBADF The mqdes argument is an invalid message queue descriptor.
ENOSYS The mq_open() function is not supported by the system.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
|ATTRIBUTE TYPE |ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
|Standard |See standards(5). |
+-----------------------------+-----------------------------+
SEE ALSO
mqueue.h(3HEAD), mq_notify(3C), mq_open(3C), mq_unlink(3C), attributes(5), standards(5)
NOTES
Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned
-1 and set errno to ENOSYS.
SunOS 5.11 5 Feb 2008 mq_close(3C)