In  <m0t9v5Y-00005tC@flatlin.ka.sub.org> , you wrote:

> John Birrel writes:
> >We're living with a threaded version of NetBSD's libc where errno is thread
> >specific. By changing errno.h to define errno as:
> 
> >extern  int *__error();
> >#define errno (*__error())
> 
> I believe POSIX requires errno to be writeable in order to detect the
> indeterminate cases of sysconf()/pathconf().

And in what is that expression not writeable?

*__error() is a perfectly valid lvalue.

Matt Thomas               Internet:   matt@lkg.dec.com
3am Software Foundry      WWW URL:    <currently homeless>
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