03-15-2011
You could check out the way the kernel runs INIT. That's one of the rare, few things the kernel actually runs (often the only one in fact).
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LEARN ABOUT DEBIAN
envuidgid
envuidgid(8) System Manager's Manual envuidgid(8)
NAME
envuidgid - runs another program with environment variables indicating a specified account's uid and gid.
SYNOPSIS
envuidgid account child
DESCRIPTION
account is a single argument. child consists of one or more arguments.
envuidgid sets $UID to account's uid and $GID to account's gid. It then runs child.
EXIT CODES
envuidgid exits 111 if it cannot find a UNIX account named account, if it runs out of memory for environment variables, or if it cannot run
child. Otherwise its exit code is the same as that of child.
SEE ALSO
supervise(8), svc(8), svok(8), svstat(8), svscanboot(8), svscan(8), readproctitle(8), fghack(8), pgrphack(8), multilog(8), tai64n(8),
tai64nlocal(8), setuidgid(8), envdir(8), softlimit(8), setlock(8)
http://cr.yp.to/daemontools.html
envuidgid(8)