sockstat(1) [freebsd man page]

SOCKSTAT(1)						    BSD General Commands Manual 					       SOCKSTAT(1)

NAME

     sockstat -- list open sockets

SYNOPSIS

     sockstat [-46cLlu] [-j jid] [-p ports] [-P protocols]

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.

     -j jid	 Show only sockets belonging to the specified jail ID.

     -L 	 Only show Internet sockets if the local or foreign addresses are not in the loopback network prefix 127.0.0.0/8, or do not con-
		 tain the IPv6 loopback address ::1.

     -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.

     -P protocols
		 Only show sockets of the specified protocols.	The protocols argument is a comma-separated list of protocol names, as they are
		 defined in protocols(5).

     -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 datagram) 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)).

     If a socket is associated with more than one file descriptor, it is shown multiple times.	If a socket is not associated with any file
     descriptor, the first four columns have no meaning.

SEE ALSO

     fstat(1), netstat(1), procstat(1), inet(4), inet6(4), protocols(5)

HISTORY

     The sockstat command appeared in FreeBSD 3.1.

AUTHORS

     The sockstat command and this manual page were written by Dag-Erling Smorgrav <des@FreeBSD.org>.

BSD
								   May 16, 2012 							       BSD

Check Out this Related Man Page

udp(7)							 Miscellaneous Information Manual						    udp(7)

NAME

       udp - Internet user datagram protocol (UDP)

SYNOPSIS

       #include <sys/socket.h> #include <netinet/in.h>

       The following is the socket call for AF_INET sockets:

       s = socket(AF_INET, SOCK_DGRAM, 0); The following is the socket call for AF_INET6 sockets:

       s = socket(AF_INET6, SOCK_DGRAM, 0);

DESCRIPTION

       UDP  is	a  simple,  unreliable datagram protocol that is used to support the SOCK_DGRAM abstraction for the Internet Protocol family.  UDP
       sockets are connectionless, and are normally used with the sendto() and recvfrom() functions, though the connect()  function  may  also	be
       used to fix the destination for future packets, in which case the recv() or read() and send() or write() functions may be used.

       UDP  address  formats are identical to those used by TCP.  In particular, UDP provides a port identifier in addition to the normal Internet
       address format.	Note that the UDP port space is separate from the TCP port space (that is, a UDP port may not  be  "connected"	to  a  TCP
       port).	In  addition,  IPv4  broadcast	packets may be sent (assuming the underlying network supports this) by using a reserved "broadcast
       address"; this address is network interface dependent.  There is no broadcast address in IPv6.

       Options at the IP transport level may be used with UDP; see the ip() reference page.

ERRORS

       If a socket operation fails, errno may be set to one of the following values: An attempt was made to create a socket with a port  that  has
       already	been  allocated.  An attempt was made to create a socket with a network address for which no network interface exists.	The socket
       is already connected.  This error occurs when trying to establish connection on a socket or when trying to send a datagram with the  desti-
       nation  address	specified.   The  system  ran out of memory for an internal data structure.  The destination address of a datagram was not
       specified, and the socket has not been connected.

RELATED INFORMATION

       Functions: getsockopt(2), recv(2), send(2), socket(2)

       Files: netintro(7), inet(7), ip(7) delim off

																	    udp(7)

Linux and UNIX Man Pages

sockstat(1) [freebsd man page]

Check Out this Related Man Page

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