session mgmt: does POSIX indeed prohibit NOOP execution?

[Christoph Moench-Tegeder]

## Peter (peter at citylink.dinoex.sub.org):

> When a program is invoked via /usr/sbin/daemon, it should already be
> session leader AND group leader, and then the above code WOULD be a
> NOOP, unless POSIX would require the setpgid() to fail and thereby the
> program to abort - which, btw, is NOT a NOOP :(

https://pubs.opengroup.org/onlinepubs/9699919799/
 "The setpgid() function shall fail if: [...] The process indicated by the
  pid argument is a session leader."

Not much room to argue?

Regards,
Christoph

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