Programmer Humor

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Psychopath Dev (lemmy.world)

submitted 2 months ago by [email protected] to c/[email protected]

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[–] [email protected] 22 points 2 months ago (1 children)

It's the number of the signal sent, 9 is for SIGKILL. You can send various signals with kill, and depending on how application was made it may react on all signals with dying, or meaningfully process most of them. Afaik, SIGKILL can't be processed by the app, and it always means just that: "die already".

Checked in Wikipedia, that's about right but there are more details I left out, mostly because didn't know about them, too: POSIX signals

[–] [email protected] 4 points 2 months ago (1 children)

Thank you! That’s what I was looking for.

[–] [email protected] 7 points 2 months ago

In languages like C, your application code can register what is called a signal handler. These functions get called when the process receives a signal. You could do something like reload a config file for example, without the user needing to stop and restart the process.