PIDWATCH(1) User Contributed Perl Documentation PIDWATCH(1)NAMEpidwatch - Run a command and if another PID exits, kill the command
SYNOPSISpidwatch [--cd I<cd>] --host <host> --pid <pid> args[....]
pidwatch [--cd I<cd>] --host <host> --pid <pid> --foreground <pid>
DESCRIPTION
Chdir to the specified directory, if specified and possible, then run
the arguments as a command in the foreground. When the foreground
process exits, return its exit status. This is basically the same as
running the command directly.
In the background, watch the specified pid on the specified host. If
pidstatd is running on the specified host, and the specified pid goes
away, kill the foreground command.
Alternatively pass the PID of any process with --foreground. When the
foreground process exits, the background job exits; if the specified
watched PID exits, the foreground pid is killed.
Common usage is to kill remote rsh children when a parent is kill -9ed.
An example Perl application would invoke:
system("rsh \$remote_host pidwatch"
." --cd \$ENV{PWD} --host \$ENV{HOST} --pid \$\$"
."\$remote_command...");
Another usage is as a "barrier" to start the new step in a script when
another process completes. Just use a sleep with a appropriate timeout
value:
pidwatch--host HOST --pid PID sleep 9999999
echo PID has completed, do whatever is next
ARGUMENTS
<parameters>
All non switch arguments after the switches are passed to /bin/sh
as a -c argument. Thus passing "a && b" to pidwatch will result in
pidwatch executing "/bin/sh -c 'a && b'".
--cd dir
Directory to chdir to.
--help
Displays this message and program version and exits.
--host host
Hostname to check for specified pid on. pidstatd must be running
on that host to have this program be useful.
--killer program
Program to use instead of kill when it's time to terminate the pid.
Will be passed arguments as if it was /bin/kill (program signame
pid).
--foreground pid
Process ID to be killed when watched process exits. Used to watch
a preexisting PID, instead of launching commands under a shell.
--pid pid
Process ID to watch. When this pid exits, the program will kill
the foreground process.
--port port
Port of pidstatd server on remote host.
--signal signame
Signal number/name to send to process on remote PIDs death.
Defaults to -HUP.
--version
Displays program version and exits.
DISTRIBUTION
The latest version is available from CPAN and from
<http://www.veripool.org/>.
Copyright 2002-2013 by Wilson Snyder. This package is free software;
you can redistribute it and/or modify it under the terms of either the
GNU Lesser General Public License Version 3 or the Perl Artistic
License Version 2.0.
AUTHORS
Wilson Snyder <wsnyder@wsnyder.org>
SEE ALSO
IPC::Locker, IPC::PidStat, pidstat, pidstatd, uriexec
perl v5.20.2 2013-01-31 PIDWATCH(1)
