Re: Illegal use of reserved word in system.h

[Richard B. Johnson]

On Thu, 19 May 2005, Steven Rostedt wrote:

> On Thu, 2005-05-19 at 17:19 +0200, Andreas Schwab wrote:
> > "Richard B. Johnson" <linux-os@xxxxxxxxxxxx> writes:
> >
> > > It's also hard to see what is happening in 'C'. When I execute
> > > this:
> > >
> > > #include <stdio.h>
> > > #include <stdlib.h>
> > >
> > > int main(int cnt, char *argv[], char *env[], char *aux[])
> > > {
> > >     printf("Aux 0 = %s\n", aux[0]);
> > > //    printf("Aux 1 = %s\n", aux[1]);
> > > }
> >
> > There is no pointer to the aux table passed to main, you have to skip past
> > the environment.  Also, the aux table is an array of key/value pairs.
> >
> > > This shows that ld-linux.so, that got called first, didn't
> > > preserve the vector.
> >
> > It does.
>
> Here's a simple program to show you your pages size ;-), Now I don't
> know enough about the elfinfo size and such to make this a real program,
> but it should at least prove a point!
>
> #include <stdio.h>
>
> int main(int argc, char **argv, char **env)
> {
>        int i;
>        long *p;
>
>        for (i=0; env[i]; i++);
>        p = (long*)(&env[i+1]);
>        for (i=0; i < 10; i++) {
>                long type = *p++;
>                if (type == 6)
>                        printf("pagesz = 0x%lx (%ld)\n",*p,*p);
>                p++;
>        }
>
>        return 0;
> }
>
> -- Steve

Well this just shows that the table is somewhere on the stack
after the environment.


Cheers,
Dick Johnson
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