<b><a name="description">DESCRIPTION</a></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><a name="diagnostics">DIAGNOSTICS</a></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><a name="bugs">BUGS</a></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><a name="environment">ENVIRONMENT</a></b>
<b>MAIL_CONFIG</b>
Directory with Postfix configuration files.
<b>MAIL_VERBOSE</b>
Enable verbose logging for debugging purposes.
<b><a name="configuration_parameters">CONFIGURATION PARAMETERS</a></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><a name="locking_controls">LOCKING CONTROLS</a></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><a name="resource_and_rate_controls">RESOURCE AND RATE CONTROLS</a></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><a name="miscellaneous_controls">MISCELLANEOUS CONTROLS</a></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 variables that a privileged Postfix
process will import from a non-Postfix parent process, or
name=value environment overrides.
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Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.
