02-21-2013
'lsof' will tell you. Usually listeners bind to a specific port, or use getsocketname to acquire their own port and send it to a correspondent, like in passive FTP.
As far as IP goes, you can listen on 0.0.0.0 = any, localhost 127.0.0.1, any IP of devices on your host. Otherwise, you get nothing.
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LEARN ABOUT DEBIAN
explain_listen_or_die
explain_listen_or_die(3) Library Functions Manual explain_listen_or_die(3)
NAME
explain_listen_or_die - listen for connections on a socket and report errors
SYNOPSIS
#include <libexplain/listen.h>
void explain_listen_or_die(int fildes, int backlog);
DESCRIPTION
The explain_listen_or_die function is used to call the listen(2) system call. On failure an explanation will be printed to stderr,
obtained from explain_listen(3), and then the process terminates by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
explain_listen_or_die(fildes, backlog);
fildes The fildes, exactly as to be passed to the listen(2) system call.
backlog The backlog, exactly as to be passed to the listen(2) system call.
Returns:
This function only returns on success. On failure, prints an explanation and exits.
SEE ALSO
listen(2)
listen for connections on a socket
explain_listen(3)
explain listen(2) errors
exit(2) terminate the calling process
COPYRIGHT
libexplain version 0.52
Copyright (C) 2008 Peter Miller
explain_listen_or_die(3)