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.
-
-f address_family
-
Limit listed sockets to those of the specified address_family. The following address families are recognized: inet, for AF_INET; inet6, for AF_INET6; and local or unix, for AF_LOCAL.
-
-l
-
Show listening sockets.
-
-n
-
Numeric output only. No attempt will be made to look up symbolic names for addresses and ports.
-
-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, nor -u are specified, sockstat will list sockets in all three domains.
If neither -c nor -l are specified, sockstat will list both listening and connected sockets, as well as those sockets that are in neither state.
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, seqpacket or datagram) for UNIX sockets.
-
LOCAL ADDRESS
-
For Internet sockets, this is the address to which the local end of the socket is bound (see getsockname(2)). For bound UNIX sockets, it is the socket's filename or “-”.
-
FOREIGN ADDRESS
-
The address to which the foreign end of the socket is bound (see getpeername(2)) or “-” for unconnected UNIX sockets.