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Langue: en

Version: 2008-02-10 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)


lockfile-progs - command-line programs to safely lock and unlock files and mailboxes (via liblockfile).


 mail-lock [--use-pid] [--retry retry-count]
 mail-touchlock [--oneshot]
 lockfile-create [--use-pid] [--retry retry-count] [--lock-name] filename
 lockfile-remove [--lock-name] filename
 lockfile-touch [--oneshot] [--lock-name] filename
 lockfile-check [--use-pid] [--lock-name] filename


Lockfile-progs provides a set a programs that can be used to lock and unlock mailboxes and files safely (via liblockfile):

mail-lock - lock the current user's mailbox mail-unlock - unlock the current user's mailbox mail-touchlock - touch the lock on the current user's mailbox lockfile-create - lock a given file lockfile-remove - remove the lock on a given file lockfile-touch - touch the lock on a given file lockfile-check - check the lock on a given file


By default, the filename argument refers to the name of the file to be locked, and the name of the lockfile will be filename .lock. However, if the --lock-name argument is specified, then filename will be taken as the name of the lockfile itself.

Each of the mail locking commands attempts to lock /var/spool/mail/<user>, where <user> is the name associated with the effective user ID, as determined by via geteuid(2).

Once a file is locked, the lock must be touched at least once every five minutes or the lock will be considered stale, and subsequent lock attempts will succeed. Also see the --use-pid option and the lockfile_create(3) manpage.

The lockfile-check command tests whether or not a valid lock already exists.


-q, --quiet

Suppress any output. Success or failure will only be indicated by the exit status.

-v, --verbose

Enable diagnostic output.

-l, --lock-name

Do not append .lock to the filename. This option applies to lockfile-create, lockfile-remove, lockfile-touch, or lockfile-check.

-p, --use-pid

Write the current process id (PID) to the lockfile whenever a lockfile is created, and use that pid when checking a lock's validity. See the lockfile_create(3) manpage for more information. This option applies to lockfile-create, lockfile-remove, lockfile-touch, and lockfile-check.

-o, --oneshot

Touch the lock and exit immediately. This option applies to lockfile-touch and mail-touchlock. When not provided, these commands will run forever, touching the lock once every minute until killed.

-r retry-count, --retry retry-count

Try to lock filename retry-count times before giving up. Each attempt will be delayed a bit longer than the last (in 5 second increments) until reaching a maximum delay of one minute between retries. If retry-count is unspecified, the default is 9 which will give up after 180 seconds (3 minutes) if all 9 lock attempts fail.


Locking a file during a lengthy process:

  lockfile-create /some/file
  lockfile-touch /some/file &
  # Save the PID of the lockfile-touch process
  do-something-important-with /some/file
  kill "${BADGER}"
  lockfile-remove /some/file



For lockfile-check this indicates that a valid lock exists, otherwise it just indicates successful program execution.

Not 0

For lockfile-check a non-zero exit status indicates that the specified lock does not exist or is not valid. For other programs it indicates that some problem was encountered.




Written by Rob Browning <>
Quand tu utilise Windaube, y'a marqué 'ceci peut prendre quelques
minutes' et parfois ca prend 4/5 heures, cela demontre bien une théorie
d'Enchtein : "tout est relatif" :)
-+- RL sur debian-french : "connaître relativement peu Einstein" -+-