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 details.

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 fcntl(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 permissions 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)