postlock - lock mail folder and execute command
SYNOPSISpostlock [-cconfig_dir][-v] filecommand...DESCRIPTION
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 configuration
-v Enable verbose logging for debugging purposes. Mul-
tiple -v options make the software increasingly
file A mailbox file. The user should have read/write
The command to execute while file is locked for
exclusive access. The command is executed
directly, i.e. without interpretation by a shell
The result status is 75 (EX_TEMPFAIL) when the file is
locked by another process, 255 (on some systems: -1) when
postlock could not perform the requested operation. Oth-
erwise, the exit status is the exit status from the com-
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 exclu-
Time in seconds between successive attempts to
acquire an exclusive lock.
Limit the time after which a stale lock is removed.
Number of attempts to fork() a process before giv-
Delay in seconds between successive fork()
The Secure Mailer license must be distributed with this
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA