BSD 2.11 - man page for fstat (bsd section 8)

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FSTAT(8)										 FSTAT(8)

       fstat - file status

       fstat [ -u user ] [ -p pid ] [ filename...  ]

       Fstat identifies open files.  A file is considered open if a process has it open, if it is
       the working directory for a process, or if it is an active pure text file.  If no  options
       are specified, fstat reports on all open files.


       -u    Report all files open by a specified user.

       -p    Report all files open by a specified process id.

	     Restrict reports to the specified files.  If the file is a block special file, fstat
	     additionally reports on any open files on that device, treating it as a mounted file

       The following fields are printed

       USER  The username of the owner of the process.

       CMD   The command name of the process.

       PID   The process id.

       FD    The  file	number	in the per-process open file table.  The special names "text" and
	     "wd" mean that the file is the pure text inode or	the  working  directory  for  the
	     process.  If the file number is followed by an asterick (*), then the file is not an
	     inode, but either a socket, fifo, or has an error of some kind.  In  this	case  the
	     rest  of  the  entry is variable format, doesn't correspond to the rest of the head-
	     ings, and is enclosed in parenthesis.  The following  paragraph  describing  sockets
	     will explain the variable format.

	     Major minor number of the device this file exists on.

       INODE The inode number of the file.

       SIZE  The size in bytes of the file.

       TYPE  The type of the file. (see sys/file.h)

       Sockets	The  formating	of open sockets depends on the protocol domain.  In all cases the
       first field is the domain name, the second field is the socket type (stream, dgram,  etc),
       and  the  third	is  the  socket  flags field (in hex).	The remaining fields are protocol
       dependent.  For tcp, it is the address of the tcpcb, and for udp, the inpcb (socket  pcb).
       For  unix  domain  sockets,  its the address of the socket pcb and the address of the con-
       nected pcb (if connected).  Otherwise the protocol number and address of the socket itself
       are  printed.  The idea is not to duplicate netstat, but to make available enough informa-
       tion for further analysis.  For example, the addresses mentioned above are  the	addresses
       which  the "netstat -A" command would print for tcp, udp, and unixdomain.  Note that since
       pipe(2) is implemented with sockets, a pipe appears as  a  connected  unix  domain  stream
       socket.	A unidirectional unix domain socket indicates the direction of flow with an arrow
       ("<-" or "->"), and a full duplex socket shows a double arrow ("<->").

       Socket information clutters the output.

       Since fstat takes a snapshot of the system, it is only correct for a very short period  of

       ps(1), pstat(8)

4th Berkeley Distribution		December 12, 1987				 FSTAT(8)
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