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 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/>.
util-linux 2.38.1 2022-05-11 LSLOCKS(8)
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