1LSLOCKS(8) System Administration LSLOCKS(8)
2
6 lslocks - list local system locks
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9 lslocks [options]
10
12 lslocks lists information about all the currently held file locks in a
13 Linux system.
14 Note that lslocks also lists OFD (Open File Description) locks, these
16 locks are not associated with any process (PID is -1). OFD locks are
17 associated with the open file description on which they are acquired.
18 This lock type is available since Linux 3.15, see fcntl(2) for more
19 details.
20
22 -b, --bytes
23 Print the sizes in bytes rather than in a human-readable format.
24 By default, the unit, sizes are expressed in, is byte, and unit
26 prefixes are in power of 2^10 (1024). Abbreviations of symbols are
27 exhibited truncated in order to reach a better readability, by
28 exhibiting alone the first letter of them; examples: "1 KiB" and "1
29 MiB" are respectively exhibited as "1 K" and "1 M", then omitting
30 on purpose the mention "iB", which is part of these abbreviations.
31 -i, --noinaccessible
33 Ignore lock files which are inaccessible for the current user.
34 -J, --json
36 Use JSON output format.
37 -n, --noheadings
39 Do not print a header line.
40 -o, --output list
42 Specify which output columns to print. Use --help to get a list of
43 all supported columns.
44 The default list of columns may be extended if list is specified in
46 the format +list (e.g., lslocks -o +BLOCKER).
47 --output-all
49 Output all available columns.
50 -p, --pid pid
52 Display only the locks held by the process with this pid.
53 -r, --raw
55 Use the raw output format.
56 -u, --notruncate
58 Do not truncate text in columns.
59 -h, --help
61 Display help text and exit.
62 -V, --version
64 Print version and exit.
65
67 COMMAND
68 The command name of the process holding the lock.
69 PID
71 The process ID of the process which holds the lock or -1 for
72 OFDLCK.
73 TYPE
75 The type of lock; can be FLOCK (created with flock(2)), POSIX
76 (created with fcntl(2) and lockf(3)) or OFDLCK (created with
77 fcntl(2)).
78 SIZE
80 Size of the locked file.
81 MODE
83 The lock’s access permissions (read, write). If the process is
84 blocked and waiting for the lock, then the mode is postfixed with
85 an '*' (asterisk).
86 M
88 Whether the lock is mandatory; 0 means no (meaning the lock is only
89 advisory), 1 means yes. (See fcntl(2).)
90 START
92 Relative byte offset of the lock.
93 END
95 Ending offset of the lock.
96 PATH
98 Full path of the lock. If none is found, or there are no
99 permissions to read the path, it will fall back to the device’s
100 mountpoint and "..." is appended to the path. The path might be
101 truncated; use --notruncate to get the full path.
102 BLOCKER
104 The PID of the process which blocks the lock.
105
107 The lslocks command is meant to replace the lslk(8) command, originally
108 written by Victor A. Abell <abe@purdue.edu> and unmaintained since
109 2001.
110
112 Davidlohr Bueso <dave@gnu.org>
113
115 flock(1), fcntl(2), lockf(3)
116
118 For bug reports, use the issue tracker at
119 https://github.com/util-linux/util-linux/issues.
120
122 The lslocks command is part of the util-linux package which can be
123 downloaded from Linux Kernel Archive
124 <https://www.kernel.org/pub/linux/utils/util-linux/>.
125util-linux 2.38.1 2022-05-11 LSLOCKS(8)