postlock - lock mail folder and execute command
postlock [-c config_dir] [-l lock_style] [-v] file command...
The postlock(1) command locks file for exclusive access, and executes command. The locking method is compatible with the Postfix UNIX-style local delivery agent. Options: -c config_dir Read the main.cf configuration file in the named directory instead of the default configuration directory. -l lock_style Override the locking method specified via the mailbox_deliv- ery_lock configuration parameter (see below). -v Enable verbose logging for debugging purposes. Multiple -v options make the software increasingly verbose. Arguments: file A mailbox file. The user should have read/write permission. command... The command to execute while file is locked for exclusive access. The command is executed directly, i.e. without inter- pretation by a shell command interpreter.
The result status is 75 (EX_TEMPFAIL) when postlock(1) could not per- form the requested operation. Otherwise, the exit status is the exit status from the command.
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.
MAIL_CONFIG Directory with Postfix configuration files. MAIL_VERBOSE Enable verbose logging for debugging purposes.
The following main.cf parameters are especially relevant to this pro- gram. The text below provides only a parameter summary. See post- conf(5) for more details including examples.
deliver_lock_attempts (20) The maximal number of attempts to acquire an exclusive lock on a mailbox file or bounce(8) logfile. deliver_lock_delay (1s) The time between attempts to acquire an exclusive lock on a mailbox file or bounce(8) logfile. stale_lock_time (500s) The time after which a stale exclusive mailbox lockfile is removed. mailbox_delivery_lock (see 'postconf -d' output) How to lock a UNIX-style local(8) mailbox before attempting delivery.
RESOURCE AND RATE CONTROLS
fork_attempts (5) The maximal number of attempts to fork() a child process. fork_delay (1s) The delay between attempts to fork() a child process.
config_directory (see 'postconf -d' output) The default location of the Postfix main.cf and master.cf con- figuration files.
postconf(5), configuration parameters
The Secure Mailer license must be distributed with this software.
Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA POSTLOCK(1)
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