On Tue, 2008-01-29 at 07:54 -0800, David Schwartz wrote:
> > There is no "global" variable named errno, it only exist in the TLS.
> You
> > could say that because there is only 1 TLS, that it's global, and it
> > acts that way. But it's not really the same as a normal global
> > variable. You can't access the variables in the same manner you
> access
> > other global variables.
>
> Is the following code legal:
>
> void foo(void)
> {
> static int *my_errno=NULL;
> if(my_errno==NULL) my_errno=errno;
> // code that uses 'my_errno' as if it were 'errno'
> }
>
> The answer is that if you're compiled single-threaded, it's perfectly legal.
> If you're multi-threaded, it's not.
No, this is not legal code under the POSIX standard at all.
--
Tomas Mraz
No matter how far down the wrong road you've gone, turn back.
Turkish proverb
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