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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
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<title> Postfix manual - postlock(1) </title>
</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</i><b>_</b><i>dir</i>] [<b>-l</b> <i>lock</i><b>_</b><i>style</i>]
[<b>-v</b>] <i>file command...</i>
<b>DESCRIPTION</b>
The <a href="postlock.1.html"><b>postlock</b>(1)</a> 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</i><b>_</b><i>dir</i>
Read the <a href="postconf.5.html"><b>main.cf</b></a> configuration file in the named directory
instead of the default configuration directory.
<b>-l</b> <i>lock</i><b>_</b><i>style</i>
Override the locking method specified via the <b><a href="postconf.5.html#mailbox_delivery_lock">mailbox_deliv</a>-</b>
<b><a href="postconf.5.html#mailbox_delivery_lock">ery_lock</a></b> configuration parameter (see below).
<b>-v</b> Enable verbose logging for debugging purposes. Multiple <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 inter-
pretation by a shell command interpreter.
<b>DIAGNOSTICS</b>
The result status is 75 (EX_TEMPFAIL) when <a href="postlock.1.html"><b>postlock</b>(1)</a> could not per-
form the requested operation. Otherwise, the exit status is the exit
status from the command.
<b>BUGS</b>
With remote file systems, the ability to acquire a lock does not neces-
sarily eliminate access conflicts. Avoid file access by processes run-
ning on different machines.
<b>ENVIRONMENT</b>
<b>MAIL_CONFIG</b>
Directory with Postfix configuration files.
<b>MAIL_VERBOSE</b>
Enable verbose logging for debugging purposes.
<b>CONFIGURATION PARAMETERS</b>
The following <a href="postconf.5.html"><b>main.cf</b></a> parameters are especially relevant to this pro-
gram. The text below provides only a parameter summary. See <a href="postconf.5.html"><b>post-</b></a>
<a href="postconf.5.html"><b>conf</b>(5)</a> for more details including examples.
<b>LOCKING CONTROLS</b>
<b><a href="postconf.5.html#deliver_lock_attempts">deliver_lock_attempts</a> (20)</b>
The maximal number of attempts to acquire an exclusive lock on a
mailbox file or <a href="bounce.8.html"><b>bounce</b>(8)</a> logfile.
<b><a href="postconf.5.html#deliver_lock_delay">deliver_lock_delay</a> (1s)</b>
The time between attempts to acquire an exclusive lock on a
mailbox file or <a href="bounce.8.html"><b>bounce</b>(8)</a> logfile.
<b><a href="postconf.5.html#stale_lock_time">stale_lock_time</a> (500s)</b>
The time after which a stale exclusive mailbox lockfile is
removed.
<b><a href="postconf.5.html#mailbox_delivery_lock">mailbox_delivery_lock</a> (see 'postconf -d' output)</b>
How to lock a UNIX-style <a href="local.8.html"><b>local</b>(8)</a> mailbox before attempting
delivery.
<b>RESOURCE AND RATE CONTROLS</b>
<b><a href="postconf.5.html#fork_attempts">fork_attempts</a> (5)</b>
The maximal number of attempts to fork() a child process.
<b><a href="postconf.5.html#fork_delay">fork_delay</a> (1s)</b>
The delay between attempts to fork() a child process.
<b>MISCELLANEOUS CONTROLS</b>
<b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
figuration files.
<b><a href="postconf.5.html#import_environment">import_environment</a> (see 'postconf -d' output)</b>
The list of environment parameters that a privileged Postfix
process will import from a non-Postfix parent process, or
name=value environment overrides.
<b>SEE ALSO</b>
<a href="postconf.5.html">postconf(5)</a>, configuration parameters
<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
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA
POSTLOCK(1)
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