close on a socket could fail if the file descriptor has already been reaped [EBADF]. [EINTR] is also possible.

close is different from shutdown because close only cleans up the file descriptor in the current process, but shutdown will terminate the connection for all processes using it.

That is to say, if you fork a child process that has an open socket, closing it within either process will free the file descriptor associated with that socket, within that process, but the other process will be free to continue using it's copy of the file descriptor and the socket.

However, shutdown will terminate the connection for all processes that have a file descriptor associated with it. The file descriptor will remain after shutdown until they are explicitly closed or otherwise GC'd.

Not having a real fork available, I'll leave questions 3 & 4 to others :)

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Handling sockets in a server by BrowserUk
in thread Handling sockets in a server by skerr1

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