postlock - Unix, Linux Command
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:
| Tag | Description |
|---|
|
-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
| Tag | Description |
|---|
|
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
| Tag | Description |
|---|
|
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
| Tag | Description |
|---|
|
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
| Tag | Description |
|---|
|
config_directory (see ’postconf -d’ output)
|
The default location of the Postfix main.cf and master.cf
configuration files.
|
SEE ALSO
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
|
|
