Re: [Sablevm-developer] Errno usage considered harmful?!

[Stephen C. <s1...@me...>]

"Grzegorz B. Prokopski" <ga...@de...> writes:

> 1. If I add:
>   #include <errno.h>
>   extern int errno;
> I get such warning:
>   java_lang_ProcessImpl.c:24: warning: function declaration isn't a
> prototype

If you are really concerned about systems whose errno.h doesn't
declare errno, wrap the variable declaration in a !defined(errno)
check.  This is what bash (not to mention GNU errno.h) does.  I
suppose you'd get a warning if you had -Wredundant-decls on and
weren't building with threads, but I don't think you do.

On GNU, when you are using threads, errno expands to a function call
(__errno_location) that returns a pointer, which is then dereferenced.

--
Stephen Compall or s11 or sirian

The best thing about growing older is that it takes such a long time.

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