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postlock - lock mail folder and execute command
postlock [-c config_dir] [-l lock_style] [-v] file command...
The postlock command locks file for exclusive access, and executes command. The locking
method is compatible with the Postfix UNIX-style local delivery agent.
Read the main.cf configuration file in the named directory instead of the default
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 soft-
ware increasingly verbose.
file A mailbox file. The user should have read/write permission.
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.
The result status is 75 (EX_TEMPFAIL) when postlock could not perform the requested opera-
tion. Otherwise, the exit status is the exit status from the command.
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.
Directory with Postfix configuration files.
Enable verbose logging for debugging purposes.
The following main.cf parameters are especially relevant to this program. See the Postfix
main.cf file for syntax details and for default values.
Limit the number of attempts to acquire an exclusive lock.
Time in seconds between successive attempts to acquire an exclusive lock.
Limit the time after which a stale lock is removed.
What file locking method(s) to use when delivering to a UNIX-style mailbox. The
default setting is system dependent. For a list of available file locking methods,
use the postconf -l command.
Number of attempts to fork() a process before giving up.
Delay in seconds between successive fork() attempts.
The Secure Mailer license must be distributed with this software.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
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