[Dev] setuid question

[Peter Long]

Hi all,

I am trying to setup a daemon that I wrote so that it runs under its own
userid (with restricted privileges). I also want to create a user group
that has permission to start and stop the daemon.

I tried using 'chmod 6550' to set the uid and gid bits. This results in
the effective user id and group id being set appropriately. However the
real user id and group id is still the same as that of the user that
started the daemon. Consequently only that user can send a SIGTERM signal
to the process.

I know that this must be something that has been done before and that
there is a right way and a wrong way to do it. I am most likely doing it
the wrong way.

Any pointers in the right direction would be appreciated.

--
Peter Long