Detect/check if inet_stream is closed

[nemo9955]

I want to be notified or at least check periodically if a libsocket::inet_stream created by a libsocket::inet_stream_server::accept() is closed.
I tried fcntl but it does not seem to work.

int r;
r = fcntl(cli_sock->getfd(), F_GETFL);
if (r == -1)
    is_ok = false;

[dermesser]

I don't think your fcntl call would work, as a socket is not a file. In general, once a call to recv(2) returns 0, you can expect the socket to be closed/the connection to have been terminated.

If you really need to detect a closed stream without reading anything from the socket, you can use epoll: the EPOLLRDHUP event flag should indicate the situation you're looking for.