04-04-2012
10 More Discussions You Might Find Interesting
1. Programming
Hi all,
I've been trying for hours to figure out how to turn my 2-program (one to send and one to receive) "chat system" using message queues, into a single program where each concurrent component (entity) will both send and receive messages. PLEASE give me a hand with this, I'm starting to... (9 Replies)
Discussion started by: mgchato
9 Replies
2. UNIX for Dummies Questions & Answers
let 3 processes a, b and c are sharing msgs using msg queues.process 'a' sending msg to 'c' and in turn 'c' send sthat msg to 'b'.if something happens to c how can 'a' and 'b' know that 'c' is not available?????? (2 Replies)
Discussion started by: sukaam
2 Replies
3. Solaris
We have message queues created from our ERP system to our tax system via an application api written by the ERP software vendor.
Occasionally when a user does not gracefully exit the ERP application, the message queue hangs. After a few months, this becomes a problem as the queues are all used... (2 Replies)
Discussion started by: MizzGail
2 Replies
4. Linux
how to check the maximun number of message queues in current linux enviornment? is there any command ? (4 Replies)
Discussion started by: princelinux
4 Replies
5. Programming
Hi,
According to my understanding..
When message queues are used, when a process post a message in the queue and if another process reads it from the queue then the queue will be empty unlike shared memory where n number of processess can access the shared memory and still the contents remain... (2 Replies)
Discussion started by: rvan
2 Replies
6. UNIX for Advanced & Expert Users
If I use sockets for IPC, and can easily distribute my applications.
UNIX Message Queues are local to the processor.
As I understand it, Message Queues still incur system call overhead, just like socket calls.
What advantage does a UNIX Message Queue provide versus a TCP or UDP Socket,... (2 Replies)
Discussion started by: zen29sky
2 Replies
7. Programming
Hi,
Am supposed to use message queues to send and receive messages between the processes. when i was working on that i realised that the message qid and the message queue related data should be maintained in a shared memory so that it can be accessed by all the processes. Could anybody refer... (10 Replies)
Discussion started by: rvan
10 Replies
8. UNIX for Advanced & Expert Users
#include <sys/ipc.h>
#include <sys/msg.h>
int main()
{
int qid;
int t;
struct msgbuf mesg;
qid=msgget(IPC_PRIVATE,IPC_CREAT);
mesg.mtype=1L;
mesg.mtext=1;
t=msgsnd(qid,&mesg,1,0);
printf("%d",t);
}
the program prints -1 as the result of msgsnd ,which means that msgsnd doesn't... (1 Reply)
Discussion started by: tolkki
1 Replies
9. UNIX for Dummies Questions & Answers
can any body provide a tutorial that explains the concept of message queues in UNIX in great detail (1 Reply)
Discussion started by: asalman.qazi
1 Replies
10. Shell Programming and Scripting
i have an application installed on AIX 5.3 and i have made a script that shutdown a proccesses that exceeded 10000kb of memory usage but i have a problem with cleaning the message queues of these proccesses after shutting them down. Is there any way to clean the message queues for this particular... (8 Replies)
Discussion started by: Portabello
8 Replies
LEARN ABOUT DEBIAN
curvecpmessage
NaCl(1) General Commands Manual NaCl(1)
NAME
CurveCP -- Message-handling programs
SYNOPSIS
curvecpmessage [-q (optional)] [-Q (optional)] [-v (optional)] [-c (optional)] [-C (optional)] [-s (optional)] [prog]
DESCRIPTION
This manual page documents briefly the CurveCP commands.
A traditional UNIX-style server such as ftpd handles just one network connection, reading input from stdin and writing output to stdout. A
"superserver" such as inetd or tcpserver listens for network connections and starts a separate server process for each connection.
The CurveCP command-line tools have an extra level of modularity. The curvecpserver superserver listens for network connections. For each
connection, curvecpserver starts the curvecpmessage message handler; curvecpmessage then starts a server such as ftpd. Then ftpd sends a
stream of data to curvecpmessage, which in turn sends messages to curvecpserver, which encrypts and authenticates the messages and sends
them inside network packets. At the same time curvecpclient receives network packets, verifies and decrypts messages inside the packets,
and passes the messages to curvecpmessage; curvecpmessage sends a stream of data to ftpd. The same curvecpmessage tool is also used by
curvecpclient.
curvecpserver and curvecpclient can use programs other than curvecpmessage. Those programs can directly generate messages in the CurveCP
message format without talking to separate tools such as ftpd; or they can support a completely different protocol that reuses CurveCP's
cryptographic layer but transmits different kinds of messages.
OPTIONS
How to use curvecpmessage:
-q optional
no error messages
-Q optional
print error messages (default)
-v optional
print extra information
-c optional
program is a client; server starts first
-C optional
program is a client that starts first
-s optional
program is a server (default)
prog run this server
SEE ALSO
curvecpserver (1), curvecpclient (1), inetd (8), tcpserver (1).
AUTHOR
This manual page was written by Sergiusz Pawlowicz debian@pawlowicz.name for the Debian system (and may be used by others). The source of
this page is a webpage http://curvecp.org/messageapi.html . Permission is granted to copy, distribute and/or modify this document under
public domain.
This manual page was rewritten for the Debian distribution because the original program does not have a manual page.
NaCl(1)