freebsd 中查看打开的端口与对应的进程之间的关联

在freebsd中可以使用sockstat查看打开的socket的情况，包含了端口相应进程的进程名、PID，用户等！

 系统说明：

NAME
     sockstat -- list open sockets

SYNOPSIS
     sockstat [-46clu] [-p ports]

DESCRIPTION
     The sockstat command lists open Internet or UNIX domain sockets.

     The following options are available:

     -4          Show AF_INET (IPv4) sockets.

     -6          Show AF_INET6 (IPv6) sockets.

     -c          Show connected sockets.

     -l          Show listening sockets.

     -p ports    Only show Internet sockets if either the local or foreign
                 port number is on the specified list.  The ports argument is
                 a comma-separated list of port numbers and ranges specified
                 as first and last port separated by a dash.

     -u          Show AF_LOCAL (UNIX) sockets.

     If neither -4, -6 or -u is specified, sockstat will list sockets in all
     three domains.

     If neither -c or -l is specified, sockstat will list both listening and
     connected sockets.

     The information listed for each socket is:

     USER             The user who owns the socket.

     COMMAND          The command which holds the socket.

     PID              The process ID of the command which holds the socket.

     FD               The file descriptor number of the socket.

     PROTO            The transport protocol associated with the socket for
                      Internet sockets, or the type of socket (stream or data-
                      gram) for UNIX sockets.

     LOCAL ADDRESS    For Internet sockets, this is the address the local end
                      of the socket is bound to (see getsockname(2)).  For
                      bound UNIX sockets, it is the socket's filename.  For
                      other UNIX sockets, it is a right arrow followed by the
                      endpoint's filename, or ``??'' if the endpoint could not
                      be determined.

     FOREIGN ADDRESS  (Internet sockets only) The address the foreign end of
                      the socket is bound to (see getpeername(2)).

     Note that TCP sockets in the AF_INET or AF_INET6 domains that are not in
     one of the LISTEN, SYN_SENT, or ESTABLISHED states may not be shown by
     sockstat; use netstat(1) to examine them instead.

SEE ALSO
     fstat(1), netstat(1), inet(4), inet6(4)

HISTORY
     The sockstat command appeared in FreeBSD 3.1.

AUTHORS
     The sockstat command and this manual page were written by Dag-Erling
     Smorgrav <[e-mail]>.

FreeBSD 5.4                    September 7, 2004                   FreeBSD 5.4

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