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. Programming
Hi,
I wanted to know whether the POSIX message queues are statically allocated memory by the kernel based on the parameters specified in the open or as and when we send messages, memory are allocated?
Does the kernel reserve the specified memory for the message queue irrespective of whether... (1 Reply)
Discussion started by: sumtata
1 Replies
3. Programming
in a single main() function,so need signal handling. Use Posix Message Queue IPC mechanism , can ignore the priority and other linked list message,to implement the scenario:
client:Knock Knock
server:who's there
client: Eric
Server:Eric,Welcome.
client:exit
all process terminated
... (1 Reply)
Discussion started by: ouou
1 Replies
4. Programming
Hello,
I am trying to implement posix message queue application. I am faced with an error on the mq_receive section. It says "Message too long". I've tried couple of small tweeks, but to no result. Please do suggest any rectificaitons.
mq_send section-works successfully
#include... (2 Replies)
Discussion started by: katwalatapan
2 Replies
5. Programming
Hello !!!!! I have a simple question but i can't find the answer anywhere hope to meet it here.
Why it is a bad idea to pass pointers through message queues ?
Most structs i see all of their char types are arrays... Is it becase having pointers means we could possibily send wrong bytes ?
For... (2 Replies)
Discussion started by: qlyine
2 Replies
6. Programming
Hii can anyone pls tell how to limit the max no of message in a posix message queue. I have made changes in proc/sys/fs/mqueue/msg_max
But still whenever i try to read the value of max. message in the queue using attr.mq_curmsgs (where struct mq_attr attr) its giving the default value as 10.... (0 Replies)
Discussion started by: mohit3884
0 Replies
7. Linux
Hi all,
Please tell me how to change POSIX message queue maximum size? "ulimit" is not a solution because it controls shell resources. But i need to control queue size before login in and starting the shell. It is needed to limit queue size for applications started before login in.
Sorry for my... (7 Replies)
Discussion started by: Vourhey
7 Replies
8. Programming
Hello,
i need to write a message queue "chat server", that should work only localy.
Can anyone please help me with some ideas and peshaps code. I'm studying the UNIX IPC mechanisms right now. So far, i understand how it works but i still cannot get an idea how to write a chat programm...
... (2 Replies)
Discussion started by: etenv
2 Replies
9. HP-UX
Hello,
My question is related to "pipcs -qa" command under HP-UX 11i PA-RISC 64 bits.
We have a little C program that creates posix ipc message queues using the mq_open() system function.
The program fail with 'No space left on device' error when we create big queues. What is the system... (6 Replies)
Discussion started by: cadanir
6 Replies
10. Programming
Hi there:
Thanks first. When I use a message queue amony severl processes, will I have to synchronize the queue? I don't think I would have to because a message queue is implemented in a link listed. Correct me If I am wrong... (0 Replies)
Discussion started by: yanhu
0 Replies
imqkeytool(1M) System Administration Commands imqkeytool(1M)
NAME
imqkeytool - generate a self-signed certificate for secure communication
SYNOPSIS
/usr/bin/imqkeytool [-broker] [-servlet keystore_location]
/usr/bin/imqkeytool -h
DESCRIPTION
The imqkeytool utility generates a self-signed certificate for secure communication. The certificate can be used by a broker instance to
establish a secure connection with a client, or by a Message Queue-supplied HTTPS servlet to establish a secure connection with a broker
instance. An HTTPS servlet is an SSL-enabled varient of the HyperText Transfer Protocol that establishes a secure connection with a broker
instance.
Without an option, imqkeytool generates a self-signed certificate for a broker instance.
imqkeytool uses command line options to specify whether the certificate is used by a broker instance or by a servlet.
OPTIONS
The following options are supported:
-broker Generate a self-signed certificate for the broker and places it in the Message Queue keystore. All broker
instances running on a system must use the same certificate.
-h Display usage help. Do not execute anything else on the command line.
-servlet keystore_location Generate a self-signed certificate for an HTTPS servlet and places it in keystore_location.
keystore_location refers to the location of the keystore. You should move this keystore to a location where
it is accessible and readable by the Message Queue HTTPS servlet to establish a secure connection with a bro-
ker.
ENVIRONMENT VARIABLES
The following environment variables affect the execution of this command:
IMQ_JAVAHOME Specify the Java 2 compatible runtime. When this environment variable is not set it defaults to /usr/j2se.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
FILES
/etc/imq/keystore Contains Message Queue keystore in which imqkeytool stores a self-signed certificate for brokers.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWiqu |
+-----------------------------+-----------------------------+
SEE ALSO
imqadmin(1M), imqbrokerd(1M), imqcmd(1M), imqdbmgr(1M), imqobjmgr(1M), imqusermgr(1M), attributes(5)
Sun Java System Message Queue Administrator's Guide
SunOS 5.11 11 Mar 2004 imqkeytool(1M)
