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, --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 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)

AVAILABILITY

       The   lslocks   command   is  part  of  the  util-linux  package  and  is  available  from
       https://www.kernel.org/pub/linux/utils/util-linux/.