"Yury V. Zaytsev" <yury@xxxxxxxxxx> wrote:
> ...
> bash-5.1$ gcc mmap-full.c
> bash-5.1$ export XPG_SUS_ENV=ON
> bash-5.1$ ./a.out
> bash-5.1$ echo $?
> 0
> bash-5.1$ unset XPG_SUS_ENV
> bash-5.1$ ./a.out
> bash-5.1$ echo $?
> 10
>
> ... all controlled by a variable at runtime
> ... nothing one can do at the build time, only runtime control.
Never say never :)
One could, at build time, include code to do something like (untested):
if (strcmp(getenv("XPG_SUS_ENV", "ON")) != 0)
{
setenv("XPG_SUS_ENV", "ON", 1);
}
(and yes, if AIX has already tested XPG_SUS_ENV before this gets
control, it might also be necessary for the program to re-exec
itself).
> ... for my use case, it's better to just get rid of mmap altogether.
Indeed.
