[gtkmm] setuid(), seteuid(), setreuid(), setresuid()

[gamehack <gamehack gmail com>]

Hello again,

I''m investigating a way in which I can manage my user privileges and
I've come across these functions: setuid(), seteuid(), setreuid(),
setresuid(). And I want to ask what's the difference between
effective, real and saved user. Because that's the quoted difference
between them in the docs, but I couldn't find anywhere the actual
explanations of the terms in this context. Thanks in advance.

Cheers,
gamehack