The most complete description I know of is in
"Advanced Programming in the Unix Environment"
by W. Richard Stevens (Addison-Wesley), chapter
8 section 10, "Changing User IDs and Group IDs".

Lots of good info for Posix can be found at
the Linux Documentation Project:
http://www.linuxdoc.org/
in the man pages, or at
http://www.bsdi.com/bsdi-man/ or
http://www.rt.com/man/

If you are unfamiliar with Posix, the gid is
an integer that identifies a group of users,
i.e., payroll, accounting, programming, etc; it
is not related to MPE x.GROUP.ACCOUNT. (I believe
setgid() under MPE is implimented as "return(0)").
If you are familiar with Posix, please don't read
this paragraph.


> -----Original Message-----
> From: Curtis Larsen [mailto:[log in to unmask]]
> Sent: Monday, November 05, 2001 1:10 PM
> To: [log in to unmask]
> Subject: Where do I GETGID()?
>
>
> Would someone kindly point me to the generally-used-by-gcc system
> library file wherein I can peruse a human-legible copy of GETGID()
> and/or SETGID() [or a reasonable alternative thereof]?
>
> Thanks!
> Curtis

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