Hi all,
I have one server application which is compiled on linux and it is running fine and my client application is also working fine. My problem is that when the client comes down or client closes the connection how can my server program come know that the connections with the client is not alive.
When i am sending large data through the network to client it is not get read by client at this point i want to know from server program whether the client is alive or not. How can i do this. Any suggestions.

Let the client confirm reception of data through the protocol that you use.
E.g.
client requests file
server sends first 1000 bytes
server waits for acknowlege
server sends second 1000 bytes
server waits for acknowlege
etc etc

Further, when a client disconnects nicely, the socket at the server side will indicate that there is data received but reading it will return 0 bytes. You might also get some sigpipe errors that you have to catch (not 100% sure, but probably when you try to write over a closed socket).

FYI, there is a dedicated programming forum