NAME¶

runlock - prevent concurrent execution of a process

SYNOPSYS¶

runlock [ -h ]

runlock [ -d ] [ -f pathname ] [ -t timeout ] command [ args ]

DESCRIPTION¶

runlock tries to hold an exclusive lock while it executes a command. Subsequent execution of runlock with the same lock, while that lock is held, will cause the new instance of runlock to terminate with a failure exit code. Otherwise, the exit code of the subprocess is returned.

USAGE¶

-d

Debug mode; send log messages to standard error as well as to the system log.

-f pathname

Specifies the pathname of the file to use as a lock file. The default is to create a lock file in /tmp/cronutils-$USER with the name of the command, and suffix ".pid".

-t timeout

Specifies the duration, in seconds, for runlock to wait before giving up on trying to acquire the lock. The default is 5 seconds.

-h

Prints some basic help.

BUGS¶

Sending SIGALRM to runlock before the timer has expired will cause the subprocess to be killed.

SEE ALSO¶

runalarm(1), runstat(1)

AUTHOR¶

runlock was written by Jamie Wilkinson <jaq@google.com>.

COPYRIGHT¶

This program is copyright (C) 2010 Google, Inc.

It is licensed under the Apache License, Version 2.0