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NetBSD 6.1.5 - man page for fstat (netbsd section 1)

FSTAT(1)			   BSD General Commands Manual				 FSTAT(1)

NAME
     fstat -- display status of open files

SYNOPSIS
     fstat [-fnv] [-M core] [-N system] [-p pid] [-u user] [file ...]

DESCRIPTION
     fstat identifies open files.  A file is considered open by a process if it was explicitly
     opened, is the working directory, root directory, active pure text, or kernel trace file for
     that process.  If no options are specified, fstat reports on all open files in the system.

     Options:

     -f      Restrict examination to files open in the same file systems as the named file argu-
	     ments, or to the file system containing the current directory if there are no addi-
	     tional filename arguments.  For example, to find all files open in the file system
	     where the directory /usr/src resides, type ``fstat -f /usr/src''.	Please see the
	     BUGS section for issues with this option.

     -M      Extract values associated with the name list from the specified core instead of the
	     default /dev/kmem.

     -N      Extract the name list from the specified system instead of the default /netbsd.

     -n      Numerical format.	Print the device number (maj,min) of the file system the file
	     resides in rather than the mount point name; for special files, print the device
	     number that the special device refers to rather than the filename in /dev; and print
	     the mode of the file in octal instead of symbolic form.

     -p      Report all files open by the specified process.

     -u      Report all files open by the specified user.

     -v      Verbose mode.  Print error messages upon failures to locate particular system data
	     structures rather than silently ignoring them.  Most of these data structures are
	     dynamically created or deleted and it is possible for them to disappear while fstat
	     is running.  This is normal and  unavoidable since the rest of the system is running
	     while fstat itself is running.

     file ...
	     Restrict reports to the specified files.

     The following fields are printed:

     USER   The username of the owner of the process (effective UID).

     CMD    The command name of the process.

     PID    The process ID.

     FD     The file number in the per-process open file table or one of the following special
	    names:

		  text	 pure text inode
		  wd	 current working directory
		  root	 root inode
		  tr	 kernel trace file

	    If the file number is followed by an asterisk (``*''), the file is not an inode, but
	    rather a socket, FIFO, or there is an error.  In this case the remainder of the line
	    doesn't correspond to the remaining headers -- the format of the line is described
	    later under SOCKETS.

     MOUNT  If the -n flag wasn't specified, this header is present and is the pathname that the
	    file system the file resides in is mounted on.

     DEV    If the -n flag is specified, this header is present and is the major/minor number of
	    the device that this file resides in.

     INUM   The inode number of the file.

     MODE   The mode of the file.  If the -n flag isn't specified, the mode is printed using a
	    symbolic format (see strmode(3)); otherwise, the mode is printed as an octal number.

     SZ|DV  If the file is not a character or block special file, prints the size of the file in
	    bytes.  Otherwise, if the -n flag is not specified, prints the name of the special
	    file as located in /dev.  If that cannot be located, or the -n flag is specified,
	    prints the major/minor device number that the special device refers to.

     R/W    This column describes the access mode that the file allows.  The letter ``r'' indi-
	    cates open for reading; the letter ``w'' indicates open for writing.  This field is
	    useful when trying to find the processes that are preventing a file system from being
	    downgraded to read-only.

     NAME   If filename arguments are specified and the -f flag is not, then this field is
	    present and is the name associated with the given file.  Normally the name cannot be
	    determined since there is no mapping from an open file back to the directory entry
	    that was used to open that file.  Also, since different directory entries may refer-
	    ence the same file (via ln(1)), the name printed may not be the actual name that the
	    process originally used to open that file.

SOCKETS
     The formatting of open sockets depends on the protocol domain.  In all cases the first field
     is the domain name and the second field is the socket type (stream, dgram, etc.).	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 name of the file if available.  Otherwise the address of the connected pcb is printed
     (if connected).  For other domains, the protocol number and address of the socket itself are
     printed.  The attempt is to make enough information available to permit further analysis
     without duplicating netstat(1).

     For example, the addresses mentioned above are the addresses which the ``netstat -A'' com-
     mand would print for TCP, UDP, and UNIX domain.  For kernels compiled with PIPE_SOCKETPAIR
     pipes appear as connected UNIX domain stream sockets.  A unidirectional UNIX domain socket
     indicates the direction of flow with an arrow (``<-'' or ``->''), and a full duplex socket
     shows a double arrow (``<->'').

     For internet sockets fstat also attempts to print the internet address and port for the
     local end of a connection.  If the socket is connected, it also prints the remote internet
     address and port.	An asterisk (``*'') is used to indicate an INADDR_ANY binding.

SEE ALSO
     netstat(1), nfsstat(1), ps(1), sockstat(1), systat(1), vmstat(1), fstat(2), iostat(8),
     pstat(8)

HISTORY
     The fstat command appeared in 4.3BSD-Tahoe.

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

     Moreover, because DNS resolution and YP lookups cause many file descriptor changes, fstat
     does not attempt to translate the internet address and port numbers into symbolic names.

     Note that the -f option will not list UNIX domain sockets open in the file system, because
     the pathnames in the sockets may not be absolute and are not deterministic.  To find all the
     UNIX domain sockets, use fstat to list all the sockets, and look for the ones that maybe
     belong in the file system.

BSD					September 5, 2011				      BSD


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