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add kill and start parameters to daemon node

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Dave Conway-Jones
2017-05-03 17:46:10 +01:00
parent a3211a5e80
commit 0fb8a1a2a0
4 changed files with 34 additions and 17 deletions
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9
utility/daemon/README.md
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@@ -31,8 +31,13 @@ The command provides 3 outputs... stdout, stderr, and return code, from the runn
If the called program stops (i.e. a return code is produced), this node can attempt
to restart the command automatically.
**Note :** when you stop Node-RED running we may not get a chance to kill the
called program so it may remain running. You <i>may</i> have to kill it manually.
Setting `msg.kill` to a signal name (e.g. SIGINT, SIGHUP) will stop the process - but if the restart flag is set it will then auto restart.
Sending `msg.start` will also re-start the process.
**Note:** Some applications will automatically buffer lines of output. It is advisable to turn off this behaviour.
For example, if running a Python app, the `-u` parameter will stop the output being buffered.
For example it can be used to run and then monitor the
<a href="https://github.com/antirez/dump1090" target="_new">dump1090</a> plane