07-01-2011
Well, don't launch sendmail -bd, the usual mail server app. You can block a listening port with some mechanisms, like firewall SW jammed in the stack beside the NICs.
netstat -a will show any connections, but mail is a short connection protocol, like http/1.0 not persistent. lsof will tell you about every open fd on the system, including sockets. Sendmail logs somewhere, check the man page, config files.
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LEARN ABOUT DEBIAN
roar_socket_listen
roar_socket_listen(3) System Manager's Manual: RoarAudio roar_socket_listen(3)
NAME
roar_socket_listen - Opens a new listen socket
SYNOPSIS
#include <roaraudio.h>
int roar_socket_listen(int type, char * host, int port);
DESCRIPTION
Opens a new listening socket for network clients to connect to. You may accept new connections via accept(2).
PARAMETERS
type The type of the Socket. See the list below.
host The host or path name to listen on. This depends on the type argument. For TCP/IP to listen on any interface use a value of
"0.0.0.0".
port The port number to listen on. This may be ignored by types not supporting port numbers.
SOCKET TYPES
ROAR_SOCKET_TYPE_UNKNOWN
The type will be auto detected. Don't use this if you know the type. Only use this to support user given addresses and enable auto
detection.
ROAR_SOCKET_TYPE_TCP
Use a TCP/IP connection. This is standard mode for networking. host is the hostname or IP to listen on and port is the port number
to use.
ROAR_SOCKET_TYPE_INET
Same as above but deprecated. Use ROAR_SOCKET_TYPE_TCP.
ROAR_SOCKET_TYPE_UNIX
UNIX Domain Socket. This should be default for local connections. host is the filename of the socket.
ROAR_SOCKET_TYPE_DECNET
DECnet socket.
ROAR_SOCKET_TYPE_FORK
This is to fork a roard to communicate with. Can't be use to listen on, just to connect to. host and port is ignored at the moment.
ROAR_SOCKET_TYPE_FILE
This is used to open a plain file. Can't be use to listen on, just to connect to. host is the filename to connect to.
RETURN VALUE
On success these calls return filehandle. On error, -1 is returned.
BUGS
Listening on UDP sockets is not supported at the moment.
EXAMPLES
FIXME
SEE ALSO
accept(2), libroar(7), RoarAudio(7).
RoarAudio May 2011 roar_socket_listen(3)