Real and effective uid in setuid executable

[Sven Ekman <svekman@yahoo.se>]

Hello,

I have a setuid executable which is written in C.  Is
there a system call with which I can get the uid of
the calling user if the executable is setuid root?

If the executable is setuid to a non-root user,
getuid() and geteuid() return the real and effective
userid as expected.  If setuid root, both return "0".

Is there a good reason for this behaviour? A way to
circumvent it? Or a very good reason not to try?

Thanks and regards,
Sven



	
	
		
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