posix ipc message queue Post: 302072113

10 More Discussions You Might Find Interesting

1. Programming

POSIX Message Queue - Settings

How can I increase the POSIX Msg Q parameter SC_MQ_PRIO_MAX? The maximum is defined as 32. Can I increase the number? If so, how? Deepa

2. UNIX for Dummies Questions & Answers

Posix vs System V IPC quesions

What are the differences/similarities between posix and system V ipc and their mechanisms? also, why is system v only limited to inter-process communication on a single node? thanks

3. Linux

POSIX message queue size

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...

4. Programming

How to limit max no of message in a posix message queue

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....

5. Programming

IPC - queue problems

Hi, I�m having a lot of problems when working with message queues, both on HP-UX Systems and Sun Solaris. When we fill a queue with a messages, the system hangs and locks everything that relies on the use of IPC resources. Anyone knows how to eliminate this problem? Thanks, Haroldo Teixeira

6. UNIX for Dummies Questions & Answers

IPC Message Queue. msgrcv doesnt work..

Hi everybody, this is the situation. there is a programm XYZ which opens a message queue with the key 47110815 and waits for a SIGUSR1. After receiving this signal it sends a message with type 100 and a number (as ASCII) in the message-body. I have to write a prog which frist sends the...

7. Programming

kill() function problem in client-server ipc message using 2 FIFOs

I want to have a message send & receive through 2 uni-direction FIFO Flow of data FIFO1 stdin--->parent(client) writefd--->FIFO1-->child(server) readfd FIFO2 child(server) writefd2---->FIFO2--->parent(client) readfd2--->stdout I need to have boundary structed message...

8. Programming

Please help:program hang stuck there signal handling on POSIX Message Queue UNIX C 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 ...

9. Programming

POSIX Message Queue Memory Allocation

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...

10. Programming

POSIX message queue mq_open directory

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) { ...

LEARN ABOUT LINUX

ipcs

IPCS(1) 						     Linux Programmer's Manual							   IPCS(1)

NAME

       ipcs - provide information on ipc facilities

SYNOPSIS

       ipcs [-asmq] [-tclup]
       ipcs [-smq] -i id
       ipcs -h

DESCRIPTION

       ipcs provides information on the ipc facilities for which the calling process has read access.

       The -i option allows a specific resource id to be specified.  Only information on this id will be printed.

       Resources may be specified as follows:

       -m     shared memory segments

       -q     message queues

       -s     semaphore arrays

       -a     all (this is the default)

       The output format may be specified as follows:

       -t     time

       -p     pid

       -c     creator

       -l     limits

       -u     summary

SEE ALSO

       ipcrm(1), ipcmk(1)

CONFORMING TO

       The  Linux  ipcs  utility is not fully compatible to the POSIX ipcs utility.  The Linux version does not support the -b and -o options, but
       does support the -l and -u options not defined by POSIX. The portable application shall not use the -a, -b, -o, -l, and -u options.

AUTHOR

       krishna balasubramanian (balasub@cis.ohio-state.edu)

AVAILABILITY

       The ipcs command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

Linux 0.99							  9 October 1993							   IPCS(1)