wait-pid-wrapper 0.1.0

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Wait PID Wrapper

Introduction

Start a process and store the process identifier in a pid file (wait-pid-wrapper-exec).

The pid file then can be awaited until the process ends (wait-pid-wrapper-waitpid).

This is useful for running a normal process as a service using SystemD, preventing it from running concurrently or running for infinity.

SystemD is capable of running processes as a service but it cannot gracefully timeout (AFAIK).

You can either set KillSignal to something harmless or KillMode=none but then SystemD doesn't timeout the process.

Usage

The following SystemD unit starts a sleep process with the following behavior:

command	is sleep running?	behavior
systemctl start mysleep	no	start sleep
systemctl start mysleep	yes	sleep is already running
systemctl stop mysleep	no	nothing happens, sleep is not running
systemctl stop mysleep	yes	wait until sleep has finished, allow timeout to forcefully stop the process

[Unit]
Description=My sleep

[Service]
Type=exec
ExecStart=waitpidwrapper-exec mysleep sleep 9999
ExecStop=waitpidwrapper-waitpid mysleep