RE: Illegal instruction in getgrnam_r ()

> Here is a little program that produces some interesting results
> on at least 2 platforms. Both systems were using 6.0.1.
> 
> This (silly) program works on x86-linux. It produces an illegal
> instruction SIGILL on a sparc, and there is some OS-related
> problem on FreeBSD and OpenBSD (which is my issue, I know). The
> sparc problem is the more interesting of the two:
> 
>   $ uname -msr
>   SunOS 5.6 sun4u
> 
>   $ ghc -package unix bug.hs
>   $ ./a.out 
>   zsh: illegal hardware instruction (core dumped)  ./a.out

I was a bit sloppy with the implementation of getGroupEntryForName,
assuming that the system has a POSIX-compliant implementation of
getgrnam_r.  This is rarely true, it seems.

I've committed a fix for Solaris (the man page says you have to define
_POSIX_PTHREAD_SEMANTICS to get the POSIX vesrion).  Could you look into
the situation on OpenBSD and see if we have to do something similar
there?  I'll take a look at FreeBSD later.

Cheers,
        Simon