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Asked: 2026-05-23T09:44:00+00:00

I am working on a network programming using epoll. I have a connection list

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I am working on a network programming using epoll. I have a connection list and put every client in the list. I can detect user disconnection by reading 0 if the user disconnected normally. However, if the user somehow got disconnected unexpectedly then there is no way it knows about this until it tries send data to the user.

I don’t think epoll provides a nice way to handle this..so I think I should handle this on my own. I will be very appreciated if you guys can provide me anything like examples or references related to this problem.

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  1. Editorial Team

    epoll_wait will return a EPOLLHUP or EPOLLERR for the socket if the other side disconnects. EPOLLHUP and EPOLLERR are set automatically but you can also set the newer EPOLLRDHUP which explicitly reports peer shutdown.

    Also if you use send with the flag MSG_NOSIGNAL it will set EPIPE on closed connections.

    int resp = send ( sock, buf, buflen, MSG_NOSIGNAL );

    if ( resp == -1 && errno == EPIPE ) { /* other side gone away */ }

    Much nicer than getting a signal.

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