Re: Warning starting Emacs (Cygwin)

[Angelo Graziosi]

Angelo Graziosi ha scritto:

> At the end I have tried this simple test case, which is 'out context'
> (so it could be not meaningful), but it seems to return wrong values:
>
> -----------------------------------------------
> $ cat test_printf.c
> #include <stdio.h>
> #include <sys/resource.h>
>
> int main()
> {
>    struct rlimit rlimit;
>
>    unsigned long five_percent;
>    unsigned long data_size;
>
>    getrlimit (RLIMIT_AS, &rlimit);
>
>    if (RLIM_INFINITY == rlimit.rlim_max)
>       return 1;
>
>    /* This is a nonsensical case, but it happens -- rms.  */
>    if (rlimit.rlim_cur > rlimit.rlim_max)
>       return 2;
>
>    five_percent = rlimit.rlim_max / 20;
>    data_size = rlimit.rlim_cur;
>
>    printf("have getrlimit %lu, %lu %lu %lu\n",
>           data_size,five_percent,rlimit.rlim_cur,rlimit.rlim_max);
>
>    if (data_size > five_percent * 19)
>       printf("past 95 percent of memory limit\n");
>
>    return 0;
> }
>
> $ gcc -o test_printf test_printf.c
>
> $ ./test_printf
> have getrlimit 2147483648, 107374182 2147483648 2147483648
> past 95 percent of memory limit
>
> -----------------------------------------------

On GNU/Linux (on which there is NOT warning) the test case retruns 1, 
i.e. it executes


if (RLIM_INFINITY == rlimit.rlim_max)
       return 1;

with RLIM_INFINITY == rlimit.rlim_max == 4294967295

Instead on Cygwin

RLIM_INFINITY == 4294967295

rlimit.rlim_max == 2147483648


> Cheers,
>    Angelo.
>
> ---
> ... e la terra ritornata alla forma di nebulosa errerà nei cieli priva
> di parassiti e di malattie.
> .
>                          Italo SVEVO, "La coscienza di Zeno"