Re: #! and argv[0]: the path is removed before invoking the interpreter

[Wakko Warner]

> What full path? There can be many. Or none. It could be deleted right after
> it starts up.
> 
> There is no such thing as "the path to the current executable" in Unix.
> 
> (In Linux 2.2 and up, readlink(/proc/self/exe) is close)

Question: I wrote a few programs that would check it's own executable to
determin if it was set[ug]id.  If it was, it would assume something bad is
happening and not run.  Is there a way to get that information (I don't want
to test euid and uid, they could be different but the program not suid)
without using /proc?  I foolishly tryied opening argv[0] and aborting if it
wasn't openable.

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