Differences between current version and predecessor to the previous major change of lockfile-create(1).
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| Newer page: | version 8 | Last edited on Monday, February 24, 2003 5:46:32 pm | by CraigBox | |
| Older page: | version 4 | Last edited on Tuesday, June 4, 2002 12:22:16 am | by perry | Revert |
@@ -1,102 +1,52 @@
-lockfile-progs
-!!!lockfile-progs
-NAME
-SYNOPSIS
-DESCRIPTION
-EXAMPLES
-EXIT STATUS
-SEE ALSO
-HISTORY
-----
!!NAME
-
lockfile-progs - command-line programs to safely lock and unlock files and mailboxes (via liblockfile).
+
+
!!SYNOPSIS
+__mail-lock__ [[ --retry ''retry-count'' ] %%%
+__mail-unlock__ %%%
+__mail-touchlock__ [[ --oneshot ]
-__mail
-lock
__ [[ --retry ''retry-count'' ]__
-mail
-unlock
-mail
-touchlock
__ [[ --oneshot ]
+__lockfile
-create
__ [[ --retry ''retry-count'' ] ''filename'' %%%
+
__lockfile
-remove__ ''filename'' %%%
+__lockfile
-touch
__ [[ --oneshot ] ''filename'' %%%
-
-__lockfile-create__ [[ --retry ''retry-count'' ]
-''filename''__
-lockfile-remove__ ''filename''__
-lockfile-touch__ [[ --oneshot ]
-''filename''
!!DESCRIPTION
+__lockfile-progs__ provide a method to lock and unlock mailboxes and files safely (via liblockfile).
-__lockfile
-progs
__ provide a method 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
.
+Each of the mail locking commands is applied to the file /var/spool/mail/
-__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
.
+Creating a file lock includes creating the file ''filename''.lock. This requires that the user running lockfile-create have write permission to the directory where ''filename'' resides.
-Each
of the mail
locking commands is applied
to the file
-/var/spool/mail/
+Once a file is locked, the lock must be touched at least once every five minutes, or it will be considered stale and a subsequent attempt to lock the file will succeed. For both
of the locking commands __(mail-touchlock__ and __lockfile-touch),__ the --oneshot argument causes the program
to touch
the lock and exit immediately. Otherwise the program will loop forever, touching the lock once every minute until it is killed.
+For both of the locking commands __(mail-lock__ and __lockfile-create),__ the --retry argument specifies (as an integer) the maximum number of times to retry locking the file before giving up if attempts are failing. Each retry will be delayed a little longer than the last (in 5 second increments) until a maximum delay of one minute between retries is reached. The default retry count is 9 which, if all 9 attempts to lock the file fail, will give up after 180 seconds (3 minutes).
-__lockfile-create:__ lock a given file.__
-lockfile-remove:__ remove the lock on a given file.__
-lockfile-touch:__ touch the lock on a given
-file.
-
-
-Once a file is locked, the lock must be touched at least
-once every five minutes, or it will be considered stale and
-a subsequent attempt to lock the file will succeed. For both
-of the locking commands __(mail-touchlock__ and
-__lockfile-touch),__ the --oneshot argument causes the
-program to touch the lock and exit immediately. Otherwise
-the program will loop forever, touching the lock once every
-minute until it is killed.
-
-
-For both of the locking commands __(mail-lock__ and
-__lockfile-create),__ the --retry argument specifies (as
-an integer) the maximum number of times to retry locking the
-file before giving up if attempts are failing. Each retry
-will be delayed a little longer than the last (in 5 second
-increments) until a maximum delay of one minute between
-retries is reached. The default retry count is 9 which, if
-all 9 attempts to lock the file fail, will give up after 180
-seconds (3 minutes).
!!EXAMPLES
+__Locking a file during a lengthy process:__ lockfile-create /some/file lockfile-touch /some/file
-__Locking a file during a lengthy process:__
-
-
-lockfile-create /some/file lockfile-touch /some/file
!!EXIT STATUS
+* __0__ Successful program execution.
+* __NOT-0__ Some problem was encountered.
-__0__
-
-
-Successful program execution.
-
-
-__NOT-0__
-
-
-Some problem was encountered.
!!SEE ALSO
+maillock(3), touchlock(3), mailunlock(3), lockfile-create(1), lockfile-remove(1), lockfile-touch(1), lockfile_create(3), lockfile_remove(3),
+lockfile_touch(3).
-maillock(3), touchlock(3),
-mailunlock(3), lockfile-create(1),
-lockfile-remove(1), __lockfile-touch__(1),
-lockfile_create(3), __lockfile_remove__(3),
-lockfile_touch(3).
!!HISTORY
-
1998 - Written by Rob Browning
-----
