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 sizes in bytes rather than in a human-readable format.

           By default, the unit, sizes are expressed in, is byte, and unit prefixes are in power
           of 2^10 (1024). Abbreviations of symbols are exhibited truncated in order to reach a
           better readability, by exhibiting alone the first letter of them; examples: "1 KiB"
           and "1 MiB" are respectively exhibited as "1 K" and "1 M", then omitting on purpose
           the mention "iB", which is part of these abbreviations.

       -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.

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

       -V, --version
           Print version 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/util-linux/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/>.