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I was trying to learn the usage of option SO_KEEPALIVE in socket programming in C language under Linux environment. I created a server socket and used my browser to connect to it. It was successful and I was able to read the GET request, but I got stuck on the usage of SO_KEEPALIVE. I checked this link keepalive_description@tldg.org but I could not find any example which shows how to use it. As soon as I detect the client's request on accept() function I set the SO_KEEPALIVE option value 1 on the client socket. Now I don't know, how to check if the client is down, how to change the time interval between the probes sent etc. I mean, how will I get the signal that the client is down? (Without reading or writing at the client - I thought I will get some signal when probes are not replied back from client), how should I program it after setting the option SO_KEEPALIVE on). Also if suppose the probes are sent every 3 secs and the client goes down in between I will not get to know that client is down and I may get SIGPIPE. Anyways importantly I wanna know how to use SO_KEEPALIVE in the code.

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