Set root shell prompt in /etc/profile ?

[Christian Franke]

When running as member of admin group a Cygwin process normally has 
root-like privileges. But this fact cannot be checked with 'geteuid() == 
0'. The shell never sets the default root prompt '#', except if the user 
is mapped to uid 0 in /etc/passwd.

Is there a generic way to set '#' via /etc/profile ?

The attached patch works for me on Cygwin 1.7., but it relies on a 
runtime file write check.
(It also requires ACL support in /tmp and would not work on 1.5).

Is there a better way to do this?

Christian

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