Thread: Implementing timeouts with TCP sockets

  1. #1
    Registered User
    Join Date
    Apr 2005

    Implementing timeouts with TCP sockets


    Sorry, if this thread doesnt fit here. I will still ask.

    I want to wait for a certain timeout value (60 secs) after sending a request packet over a TCP socket, before deciding if the peer is dead or alive. If the reply packet comes within 60 secs from starting timer, I need to stop the timer and proceed further.

    How can I implement this functionality with TCP recv() function? Any pointers ?


  2. #2
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    Consider looking at select. Make a time stamp for each connection. Call select in a loop every so often. If that function isn't ready for reading or writing (depending on what you're doing) by the time your time runs out, close the connection. There's probably a better way to do it, but that should work.

    Also consider searching for Beej's guide to sockets.

    Hope is the first step on the road to disappointment.

  3. #3
    Registered User
    Join Date
    Apr 2005
    Hi quzah,

    I wanted to check the timeout during connect() as well as send()/recv() state. I googled for it and found a way to do it using setsockopt(). Following was my solution.

    struct timeval tv;
    tv.tv_sec = 30;       /* Timeout in seconds */
    setsockopt(sockid, SOL_SOCKET, SO_SNDTIMEO,(struct timeval *)&tv,sizeof(struct timeval));
    setsockopt(sockid, SOL_SOCKET, SO_RCVTIMEO,(struct timeval *)&tv,sizeof(struct timeval));
    It worked just fine.


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