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<html> <head> </head> <body> <pre>
POSTLOCK(1) POSTLOCK(1)
<b>NAME</b>
postlock - lock mail folder and execute command
<b>SYNOPSIS</b>
<b>postlock</b> [<b>-c</b> <i>config_dir</i><b>]</b> <b>[-v</b>] <i>file</i> <i>command...</i>
<b>DESCRIPTION</b>
The <b>postlock</b> command locks <i>file</i> for exclusive access, and
executes <i>command</i>. The locking method is compatible with
the Postfix UNIX-style local delivery agent.
Options:
<b>-c</b> <i>config_dir</i>
Read configuration information from <b>main.cf</b> in the
named configuration directory.
<b>-v</b> Enable verbose logging for debugging purposes. Mul-
tiple <b>-v</b> options make the software increasingly
verbose.
Arguments:
<i>file</i> A mailbox file. The user should have read/write
permission.
<i>command...</i>
The command to execute while <i>file</i> is locked for
exclusive access. The command is executed
directly, i.e. without interpretation by a shell
command interpreter.
<b>DIAGNOSTICS</b>
The result status is 75 (EX_TEMPFAIL) when the file is
locked by another process, 255 (on some systems: -1) when
<b>postlock</b> could not perform the requested operation. Oth-
erwise, the exit status is the exit status from the com-
mand.
<b>BUGS</b>
With remote file systems, the ability to acquire a lock
does not necessarily eliminate access conflicts. Avoid
file access by processes running on different machines.
<b>ENVIRONMENT</b>
<b>MAIL</b><i>_</i><b>CONFIG</b>
Directory with Postfix configuration files.
<b>MAIL</b><i>_</i><b>VERBOSE</b>
Enable verbose logging for debugging purposes.
<b>CONFIGURATION</b> <b>PARAMETERS</b>
The following <b>main.cf</b> parameters are especially relevant
to this program. See the Postfix <b>main.cf</b> file for syntax
1
POSTLOCK(1) POSTLOCK(1)
details and for default values.
<b>Locking</b> <b>controls</b>
<b>deliver</b><i>_</i><b>lock</b><i>_</i><b>attempts</b>
Limit the number of attempts to acquire an exclu-
sive lock.
<b>deliver</b><i>_</i><b>lock</b><i>_</i><b>delay</b>
Time in seconds between successive attempts to
acquire an exclusive lock.
<b>stale</b><i>_</i><b>lock</b><i>_</i><b>time</b>
Limit the time after which a stale lock is removed.
<b>Resource</b> <b>controls</b>
<b>fork</b><i>_</i><b>attempts</b>
Number of attempts to <b>fork</b>() a process before giv-
ing up.
<b>fork</b><i>_</i><b>delay</b>
Delay in seconds between successive <b>fork</b>()
attempts.
<b>LICENSE</b>
The Secure Mailer license must be distributed with this
software.
<b>AUTHOR(S)</b>
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
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