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POSTLOCK(1)		    General Commands Manual		   POSTLOCK(1)

NAME
       postlock	- lock mail folder and execute command

SYNOPSIS
       postlock	[-c config_dir]	[-l lock_style]
	       [-v] file command...

DESCRIPTION
       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 in-
	      stead 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 op-
	      tions 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  ac-
	      cess.   The command is executed directly,	i.e. without interpre-
	      tation by	a shell	command	interpreter.

DIAGNOSTICS
       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.

BUGS
       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.

ENVIRONMENT
       MAIL_CONFIG
	      Directory	with Postfix configuration files.

       MAIL_VERBOSE
	      Enable verbose logging for debugging purposes.

CONFIGURATION PARAMETERS
       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.

LOCKING	CONTROLS
       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  re-
	      moved.

       mailbox_delivery_lock (see 'postconf -d'	output)
	      How  to lock a UNIX-style	local(8) mailbox before	attempting de-
	      livery.

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.

MISCELLANEOUS CONTROLS
       config_directory	(see 'postconf -d' output)
	      The default location of the Postfix main.cf and  master.cf  con-
	      figuration files.

       import_environment (see 'postconf -d' output)
	      The  list	 of  environment  parameters that a privileged Postfix
	      process will  import  from  a  non-Postfix  parent  process,  or
	      name=value environment overrides.

SEE ALSO
       postconf(5), configuration parameters

LICENSE
       The Secure Mailer license must be distributed with this software.

AUTHOR(S)
       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)

NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | BUGS | ENVIRONMENT | CONFIGURATION PARAMETERS | LOCKING CONTROLS | RESOURCE AND RATE CONTROLS | MISCELLANEOUS CONTROLS | SEE ALSO | LICENSE | AUTHOR(S)

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