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
       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)

REPORTING BUGS
       For bug reports, use the issue tracker at
       https://github.com/karelzak/util-linux/issues.

AVAILABILITY
       The lslocks command is part of the util-linux package which can be
       downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.37.2                 2021-06-02                        LSLOCKS(8)