Re: [CentOS] Init checking for processes that are configured to "respawn"

On 2009-07-07, at 6:17 AM, "Dirk H. Schulz" dirk.schulz@kinzesberg.de wrote:

Hi folks,

I have a sophisticated question for which I can't find any hints on the web:

If you configure init (via /etc/inittab) to respawn processes (like the getty processes) when they exit - how often does init check for the existence of such a process? Does it check actively at all or does it rely on some kind of inter process communication?

I'd imagine it uses wait (man 2 wait) and/or waits for a SIGCHLD to be sent. The latter sent to it whenever a child process exits.

In either case, the spawned process does not need to be aware of how knit works under the hood.

HTH Michael