A weird error message.

This is a discussion on A weird error message. within the Networking/Device Communication forums, part of the General Programming Boards category; I am suddenly getting the following error when I execute perror() follwing a failed send. Code: send: Resource temporarily unavailable ...

  1. #1
    Eager young mind
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    A weird error message.

    I am suddenly getting the following error when I execute perror() follwing a failed send.

    Code:
    send: Resource temporarily unavailable
    I have never seen such a message .
    In the middle of difficulty, lies opportunity

  2. #2
    and the hat of wrongness Salem's Avatar
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    Well the "temporarily" suggests you should wait a short while and try again.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    Just hope that was not meant to be funny.. Had tried for about 10 mins before posting it here.
    In the middle of difficulty, lies opportunity

  4. #4
    and the hat of wrongness Salem's Avatar
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    So does that mean if you stop the program and restart it, then all is well for a while before it persistently displays that message?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
    Eager young mind
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    Well, actually, for this particular send(), I have to use a TIPC socket. I get this message for the first send() call that is made. I am 90% sure of that. The code is actually too huge and I am using sockets of the TCP family to transfer control information until I get into this module.
    I must have called send()/recv() on a TIPC socket hundreds of times over the last one month, never faced this problem before.Does it have to do with some option in setsockopt?
    In the middle of difficulty, lies opportunity

  6. #6
    and the hat of wrongness Salem's Avatar
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    TIPC is this? - http://tipc.sourceforge.net/
    Never used it, so I'm just guessing.

    > http://www.linuxmanpages.com/man3/errno.3.php
    EAGAIN decodes to the message "Resource temporarily unavailable"

    > http://www.linuxmanpages.com/man2/send.2.php
    EAGAIN or EWOULDBLOCK means The socket is marked non-blocking and the requested operation would block.

    The socket options could be worth looking into, maybe it's non-blocking for some reason.

    > and I am using sockets of the TCP family to transfer control information until I get into this module.
    A concurrent access problem perhaps?
    Something else already has this particular socket, so trying to use it from here causes problems?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  7. #7
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    >concurrent access problem perhaps?
    Even I just thought so. I guess its a race condition. Will force one thread to wait for some time and see if it makes any difference.
    In the middle of difficulty, lies opportunity

  8. #8
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    I am actually using the POLLING mode and after a lot of thorough checking, i have found out that this socket descriptor isnt being used anywhere else. I have no clue whats going on here. Guess will just have to wait for my guide to get back :|
    In the middle of difficulty, lies opportunity

  9. #9
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    Well, The socket that I was using had been set to Non-blocking mode using fcntl() and I didnt know that. I tried the non-blocking socket using simple TCP -SOCK_STREAM socket in a simple program. I have set the sender to sleep for 5 s before calling send() and predictably, the recv() call returned with :
    Code:
    recv: Resource temporarily unavailable
    This is because there is no data to be read and the matching send is yet to be called.
    But, going back to my original question, the reason why send gave me that error, still beats me. And my code actually works when I dont set the socket to non-blocking.
    In the middle of difficulty, lies opportunity

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