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)