msgsnd : Invalid argument

G'day, everyone!

My another issue is the following.

I have a server-client program that makes use of the message queues: clients communicate with each other centralizedly through the server; obviously, they use the same queue. Kind of a local instant messaging service with a basic set of functions. In the beginning the client registers and the server sends it a confirmation.

It works pretty well when I run it on my computer. But when I tried to execute it on the other system and send a message from the server, I immedeately got it crashed with the following error:

Code:

msgsnd : Invalid argument

This is what I got when I STFW'd :)

Quote:

Two conditions can cause that error:
1. message queue identifier is not valid
2. message length is less than zero

But:

1. the client DOES register at server, therefore it uses msgsnd() successfully; the server uses the same queue; yet, the program crashes as soon as server attempts to use msgsnd(). :confused: I use my own header as an argument for ftok();
2. the content of message is just fine.

I don't get it. My question is, what could change when I switched from one system to the other?

Thanks in advance!

Did you have to compile separately on the two systems or are you using the same executable on both of them?

Compiled separately on each system.
Forgot to mention it.

Quote:

Originally Posted by Krusty

Compiled separately on each system.
Forgot to mention it.

In that case, it is possible that you have a buffer overflow which shows up using one compiler and not the other, since there are probably small differences in the way they arranged memory. That could invalid the identifier, I guess.