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
	      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.

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
	      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.

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

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



								   POSTLOCK(1)