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I have a TCP connection. Server just reads data from the client. Now, if the connection is lost, the client will get an error while writing the data to the pipe (broken pipe), but the server still listens on that pipe. Is there any way I can find if the connection is UP or NOT?
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If you need to determine the current state of the connection, make a nonblocking, zero-byte Send call. If the call returns successfully or throws a WAEWOULDBLOCK error code (10035), then the socket is still connected; otherwise, the socket is no longer connected.
The states are: LISTEN, SYN-SENT, SYN- RECEIVED, ESTABLISHED, FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT, and the fictional state CLOSED.
A socket is a communications connection point (endpoint) that you can name and address in a network. Socket programming shows how to use socket APIs to establish communication links between remote and local processes.
The connect() call on a stream socket is used by the client application to establish a connection to a server. The server must have a passive open pending. A server that is using sockets must successfully call bind() and listen() before a connection can be accepted by the server with accept().
You could call getsockopt just like the following:
int error = 0; socklen_t len = sizeof (error); int retval = getsockopt (socket_fd, SOL_SOCKET, SO_ERROR, &error, &len); To test if the socket is up:
if (retval != 0) { /* there was a problem getting the error code */ fprintf(stderr, "error getting socket error code: %s\n", strerror(retval)); return; } if (error != 0) { /* socket has a non zero error status */ fprintf(stderr, "socket error: %s\n", strerror(error)); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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