Section (8) lslocks
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, −−outputlist-
Specify which output columns to print. Use
−−helpto 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, −−pidpid-
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_zsingle_quotesz_s access permissions (read, write). If the process is blocked and waiting for the lock, then the mode is postfixed with an _zsingle_quotesz_*_zsingle_quotesz_ (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_zsingle_quotesz_s mountpoint and ... is appended to the path. The path might be truncated; use
−−notruncateto 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 <[email protected]> and unmaintained since 2001.