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For code which uses the Berkley Sockets API (specified by POSIX, and available on Windows too) to communicate with other processes using a network protocol.
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Utilizing idle socket server to do meaningful thing (timeout after sleep on epoll_wait)
I write an app server that uses TCP socket on Linux. … When there is no traffic (no data is sent by client, no client connect() or close()), the process sleeps on epoll_wait() while waiting for events hit the socket file descriptors. …