lslocks

LSLOCKS(8)                   System Administration                  LSLOCKS(8)

NAME
       lslocks - list local system locks

SYNOPSIS
       lslocks [options]

DESCRIPTION
       lslocks  lists information about all the currently held file locks in a
       Linux system.

       Note that lslocks also lists OFD (Open File Description)  locks,  these
       locks  are  not associated with any process (PID is -1).  OFD locks are
       associated with the open file description on which they  are  acquired.
       This lock type is available since Linux 3.15, see fcntl(2) for more de-
       tails.

OPTIONS
       -b, --bytes
              Print the SIZE column in bytes rather than in  a  human-readable
              format.

       -i, --noinaccessible
              Ignore lock files which are inaccessible for the current user.

       -J, --json
              Use JSON output format.

       -n, --noheadings
              Do not print a header line.

       -o, --output list
              Specify which output columns to print.  Use --help to get a list
              of all supported columns.

              The default list of columns may be extended if list is specified
              in the format +list (e.g. lslocks -o +BLOCKER).

       --output-all
              Output all available columns.

       -p, --pid pid
              Display only the locks held by the process with this pid.

       -r, --raw
              Use the raw output format.

       -u, --notruncate
              Do not truncate text in columns.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

OUTPUT
       COMMAND
              The command name of the process holding the lock.

       PID    The  process  ID  of  the process which holds the lock or -1 for
              OFDLCK.

       TYPE   The type of lock; can be FLOCK (created  with  flock(2)),  POSIX
              (created with fcntl(2) and lockf(3)) or OFDLCK (created with fc-
              ntl(2).

       SIZE   Size of the locked file.

       MODE   The lock's access permissions (read, write).  If the process  is
              blocked  and  waiting  for  the lock, then the mode is postfixed
              with an '*' (asterisk).

       M      Whether the lock is mandatory; 0 means no (meaning the  lock  is
              only advisory), 1 means yes.  (See fcntl(2).)

       START  Relative byte offset of the lock.

       END    Ending offset of the lock.

       PATH   Full  path  of the lock.  If none is found, or there are no per-
              missions to read the path, it will fall  back  to  the  device's
              mountpoint and "..." is appended to the path.  The path might be
              truncated; use --notruncate to get the full path.

       BLOCKER
              The PID of the process which blocks the lock.

NOTES
       The lslocks command is meant to replace the lslk(8) command,
       originally written by Victor A. Abell <abe@purdue.edu> and unmaintained
       since 2001.

AUTHORS
       Davidlohr Bueso <dave@gnu.org>

SEE ALSO
       flock(1), fcntl(2), lockf(3)

AVAILABILITY
       The lslocks command is part of the util-linux package and is  available
       from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                       December 2014                      LSLOCKS(8)