The socket keyword

The socket function opens a socket of the specified kind and attaches it to filehandle SOCKET. The DOMAIN, TYPE, and PROTOCOL are specified in the same way as for syscall.

  socket SOCKET, DOMAIN, TYPE, PROTOCOL

use Socket;

$proto = getprotobyname("tcp");

socket(SOCK, PF_INET, SOCK_STREAM, $proto) || die "socket: $!";