FSTAT(1)                NetBSD 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 arguments, or to the file system containing the
             current directory if there are no additional 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 par-
             ticular 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 spec-
            ified, 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'' indicates open for reading; the letter ``w'' indi-
            cates open for writing.  This field is useful when trying to find
            the processes that are preventing a file system from being down-
            graded 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 reference 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 analy-
     sis without duplicating netstat(1).

     For example, the addresses mentioned above are the addresses which the
     ``netstat -A'' command 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 descrip-
     tor 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.

NetBSD 6.0                     September 5, 2011                    NetBSD 6.0

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