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Full Discussion: [KSH/Bash] Starting a parent process from a child process?
Top Forums Shell Programming and Scripting [KSH/Bash] Starting a parent process from a child process? Post 302408473 by bakunin on Monday 29th of March 2010 03:18:31 PM
Old 03-29-2010
Start the scripts in background and with "nohup". see the man page of "nohup" for details.

If you start them this they will no longer stop when the parent process is killed. This mechanism was originally for making sure a process would be persistent even if its terminal process got killed (hence the name: "no [termination upon] h[ang]up").

Btw., it might be a clever idea to control the processes in question with a PID file in such an environment: when starting them create a temporary file with the PID in it, which can be used to kill the process. This file will also be indicative of a process be running or not.

I hope this helps.

bakunin
 

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LEARN ABOUT CENTOS

systemd.kill

SYSTEMD.KILL(5) 						   systemd.kill 						   SYSTEMD.KILL(5)

NAME

       systemd.kill - Kill environment configuration

SYNOPSIS

       service.service, socket.socket, mount.mount, swap.swap

DESCRIPTION

       Unit configuration files for services, sockets, mount points and swap devices share a subset of configuration options which define the
       process killing parameters of spawned processes.

       This man page lists the configuration options shared by these four unit types. See systemd.unit(5) for the common options of all unit
       configuration files, and systemd.service(5), systemd.socket(5), systemd.swap(5) and systemd.mount(5) for more information on the specific
       unit configuration files. The execution specific configuration options are configured in the [Service], [Socket], [Mount], or [Swap]
       section, depending on the unit type.

OPTIONS

       KillMode=
	   Specifies how processes of this service shall be killed. One of control-group, process, none.

	   If set to control-group, all remaining processes in the control group of this unit will be terminated on unit stop (for services: after
	   the stop command is executed, as configured with ExecStop=). If set to process, only the main process itself is killed. If set to none,
	   no process is killed. In this case only the stop command will be executed on unit stop, but no process be killed otherwise. Processes
	   remaining alive after stop are left in their control group and the control group continues to exist after stop unless it is empty.
	   Defaults to control-group.

	   Processes will first be terminated via SIGTERM (unless the signal to send is changed via KillSignal=). Optionally, this is immediately
	   followed by a SIGHUP (if enabled with SendSIGHUP=). If then, after a delay (configured via the TimeoutStopSec= option), processes still
	   remain, the termination request is repeated with the SIGKILL signal (unless this is disabled via the SendSIGKILL= option). See kill(2)
	   for more information.

       KillSignal=
	   Specifies which signal to use when killing a service. Defaults to SIGTERM.

       SendSIGHUP=
	   Specifies whether to send SIGHUP to remaining processes immediately after sending the signal configured with KillSignal=. This is
	   useful to indicate to shells and shell-like programs that their connection has been severed. Takes a boolean value. Defaults to "no".

       SendSIGKILL=
	   Specifies whether to send SIGKILL to remaining processes after a timeout, if the normal shutdown procedure left processes of the
	   service around. Takes a boolean value. Defaults to "yes".

SEE ALSO

       systemd(1), systemctl(8), journalctl(8), systemd.unit(5), systemd.service(5), systemd.socket(5), systemd.swap(5), systemd.mount(5),
       systemd.exec(5), systemd.directives(7)

systemd 208															   SYSTEMD.KILL(5)
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