|RUNLOCK(1)||General Commands Manual||RUNLOCK(1)|
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 faliure exit code. Otherwise, the exit code of the subprocess is returned.
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.
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 <firstname.lastname@example.org>.
COPYRIGHT¶This program is copyright (C) 2010 Google, Inc.
It is licensed under the Apache License, Version 2.0
|October 18, 2010||Google, Inc.|