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using-daemons.md

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Using Daemons

Daemons are handled by the start-stop-daemon program included in the Mesh Extender firmware. It can daemonise any program, running it in the background until the program stops or it is told to kill it.

Below is the usage for start-stop-daemon:

Usage: start-stop-daemon [OPTIONS] [-S|-K] ... [-- ARGS...]

Search for matching processes, and then
-K: stop all matching processes.
-S: start a process unless a matching process is found.

Process matching:
	-u USERNAME|UID	Match only this user's processes
	-n NAME		Match processes with NAME
			in comm field in /proc/PID/stat
	-x EXECUTABLE	Match processes with this command
			command in /proc/PID/cmdline
	-p FILE		Match a process with PID from the file
	All specified conditions must match
-S only:
	-x EXECUTABLE	Program to run
	-a NAME		Zeroth argument
	-b		Background
	-c USER[:[GRP]]	Change to user/group
	-m		Write PID to the pidfile specified by -p
-K only:
	-s SIG		Signal to send
	-t		Match only, exit with 0 if a process is found
Other:
	-q		Quiet

Starting a daemon

To start a program as a daemon, use: start-stop-daemon -Sbx <program> [args...] where <program> is the program name and [args...] is a list of arguments that you would normally provide the program.

The program will start running in the background.

Stopping a daemon

To stop a running daemon started with the start-stop-daemon program, use: start-stop-daemon -K <program>
where <program> is the program name.

Note that this will kill the program. If you need to stop it gracefully (i.e. with a SIGHUP or SIGINT), then add -s <signal> to the options.