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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OUTPUT | NOTES | AUTHORS | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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LSLOCKS(8) System Administration LSLOCKS(8)
lslocks - list local system locks
lslocks [options]
lslocks lists information about all the currently held file locks
in a Linux system.
-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.
-H, --list-columns
List the available columns, use with --json or --raw to get
output in machine-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.
-h, --help
Display help text and exit.
-V, --version
Print version and exit.
COMMAND
The command name of the process holding the lock.
PID
The process ID of the process.
TYPE
The type of lock; can be LEASE (created with fcntl(2)), 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.
INODE
The inode number.
MAJ:MIN
The major:minor device number.
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.
HOLDERS
The holder(s) of the lock. The format of the holder is
PID,COMMAND,FD. If a lock is an open file
description-oriented lock, there can be more than one holder
for the lock. See the NOTES below.
The lslocks command is meant to replace the lslk(8) command,
originally written by Victor A. Abell <[email protected]> and
unmaintained since 2001.
"The process holding the lock" for leases, FLOCK locks, and OFD
locks is a fake-concept. They are associated with the open file
description on which they are acquired. With fork(2) and/or
cmsg(3), multiple processes can share an open file description.
So the holder process of a lease (or a lock) is not uniquely
determined. lslocks shows the one of the holder processes in
COMMAND and PID columns.
Davidlohr Bueso <[email protected]>
flock(1), fcntl(2), lockf(3)
For bug reports, use the issue tracker at
https://github.com/util-linux/util-linux/issues.
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/>. This page
is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have
a bug report for this manual page, send it to
[email protected]. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-10.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in
this COLOPHON (which is not part of the original manual page),
send a mail to [email protected]
util-linux 2.39.1041-8a7c 2023-12-22 LSLOCKS(8)
Pages that refer to this page: lsfd(1), fcntl(2), flock(2), proc_locks(5)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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