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April, 26th. 2006:
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POSTLOCK
Section: User Commands (1) Index
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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_delivery_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
interpretation by a shell command interpreter.
DIAGNOSTICS
The result status is 75 (EX_TEMPFAIL) when postlock(1)
could not perform 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
necessarily eliminate access conflicts. Avoid file access by
processes running 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 program.
The text below provides only a parameter summary. See
postconf(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
configuration 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
Index
- 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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