Re: How to properly daemonize?

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Fri, Jul 14, 2017 at 11:58:49PM -0400, Ken Hornstein wrote:
> - Call fork() in parent, and then use sigwait() to wait for SIGCHLD or SIGUSR1
> - In the child, perform library initialization. If it fails, print out
>   the error message on stderr and exit.  If it succeeds send a SIGUSR1 to
>   the parent and then perform the rest of the daemonization steps as discussed
>   previously.
> - If the parent gets a SIGCHLD, call waitpid() and exit with the exit code
>   that the child exited with. If the parent gets a SIGUSR1, then exit normally.

A better design would be to just use a pipe and write the status to
that. No signals necessary. Parents knows if the status read from the
pipe is bad OR you get EOF, initialisation went wrong.

Joerg