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issetugid() returns 1 if the process environment or memory address space
is considered tainted, and returns 0 otherwise. This happens, for example,
when a process's privileges are elevated by the setuid or setgid flags on
an executable belonging to root. This function first appeard in OpenBSD 2.0
and is needed for the LibreSSL.
This patch follows the same logic as the equivalent musl commit. For more
information see the commit message at
http://git.musl-libc.org/cgit/musl/commit/?id=ddddec106fd17c3aca3287005d21e92f742aa9d4
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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