perldoc -f shutdown

Salut,

J'ai rencontré ce problème également en C, je suis tombé sur la fonction shutdown.

shutdown SOCKET,HOW
Shuts down a socket connection in the manner indicated by HOW,
which has the same interpretation as in the system call of the
same name.

shutdown(SOCKET, 0); # I/we have stopped reading data
shutdown(SOCKET, 1); # I/we have stopped writing data
shutdown(SOCKET, 2); # I/we have stopped using this socket

This is useful with sockets when you want to tell the other
side you're done writing but not done reading, or vice versa.
It's also a more insistent form of close because it also dis-
ables the file descriptor in any forked copies in other pro-
cesses.