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lockfile-progs |
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!!!lockfile-progs |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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EXAMPLES |
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EXIT STATUS |
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SEE ALSO |
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HISTORY |
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---- |
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!!NAME |
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lockfile-progs - command-line programs to safely lock and unlock files and mailboxes (via liblockfile). |
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!!SYNOPSIS |
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__mail-lock__ [[ --retry ''retry-count'' ]__ |
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mail-unlock |
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mail-touchlock__ [[ --oneshot ] |
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__lockfile-create__ [[ --retry ''retry-count'' ] |
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''filename''__ |
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lockfile-remove__ ''filename''__ |
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lockfile-touch__ [[ --oneshot ] |
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''filename'' |
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!!DESCRIPTION |
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__lockfile-progs__ provide a method to lock and unlock |
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mailboxes and files safely (via liblockfile). |
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__mail-lock:__ lock the current user's mailbox.__ |
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mail-unlock:__ unlock the current user's mailbox.__ |
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mail-touchlock:__ touch the lock on the current user's |
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mailbox. |
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Each of the mail locking commands is applied to the file |
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/var/spool/mail/ |
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__lockfile-create:__ lock a given file.__ |
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lockfile-remove:__ remove the lock on a given file.__ |
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lockfile-touch:__ touch the lock on a given |
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file. |
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Once a file is locked, the lock must be touched at least |
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once every five minutes, or it will be considered stale and |
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a subsequent attempt to lock the file will succeed. For both |
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of the locking commands __(mail-touchlock__ and |
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__lockfile-touch),__ the --oneshot argument causes the |
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program to touch the lock and exit immediately. Otherwise |
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the program will loop forever, touching the lock once every |
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minute until it is killed. |
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For both of the locking commands __(mail-lock__ and |
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__lockfile-create),__ the --retry argument specifies (as |
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an integer) the maximum number of times to retry locking the |
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file before giving up if attempts are failing. Each retry |
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will be delayed a little longer than the last (in 5 second |
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increments) until a maximum delay of one minute between |
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retries is reached. The default retry count is 9 which, if |
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all 9 attempts to lock the file fail, will give up after 180 |
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seconds (3 minutes). |
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!!EXAMPLES |
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__Locking a file during a lengthy process:__ |
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lockfile-create /some/file lockfile-touch /some/file |
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!!EXIT STATUS |
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__0__ |
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Successful program execution. |
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__NOT-0__ |
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Some problem was encountered. |
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!!SEE ALSO |
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maillock(3), touchlock(3), |
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mailunlock(3), lockfile-create(1), |
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lockfile-remove(1), __lockfile-touch__(1), |
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lockfile_create(3), __lockfile_remove__(3), |
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lockfile_touch(3). |
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!!HISTORY |
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1998 - Written by Rob Browning |
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---- |
