Subject: Re: An errno for all seasons
To: None <tech-net@NetBSD.ORG>
From: der Mouse <mouse@Collatz.McRCIM.McGill.EDU>
List: tech-net
Date: 10/30/1995 11:48:18
>> 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().

So?  (*__error()) is a perfectly good lvalue.  (Making sure it works
right may take care in the implementation of __error(), but there's no
reason it couldn't be done.)

					der Mouse