msgsnd : Invalid argument

This is a discussion on msgsnd : Invalid argument within the C Programming forums, part of the General Programming Boards category; G'day, everyone! My another issue is the following. I have a server-client program that makes use of the message queues: ...

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    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

    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(). 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!
    Last edited by Krusty; 09-10-2009 at 11:53 AM.

  2. #2
    spurious conceit MK27's Avatar
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    Did you have to compile separately on the two systems or are you using the same executable on both of them?
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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    Compiled separately on each system.
    Forgot to mention it.

  4. #4
    spurious conceit MK27's Avatar
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    Quote Originally Posted by Krusty View Post
    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.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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