Re: math_error.7 draft 3, for review

["Andries E. Brouwer" <Andries.Brouwer-rh8NL+sEX9E@public.gmane.org>]

On Wed, Jul 16, 2008 at 03:47:41PM +0200, Michael Kerrisk wrote:

> There are two signaling mechanism:

mechanisms


> If
> .B_SVID_SOURCE
> is defined, glibc provides the older
> .I matherr ()
> error-reporting framework defined by SVID.

Typo: .B _SVID_SOURCE
But defining this does not suffice, one also needs the magic incantation
    _LIB_VERSION = _SVID_;

Example:

/* matherr demo; link with -lm */
#define _SVID_SOURCE
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

int matherr(struct exception *x) {
        fprintf(stderr, "math error\n");
        exit(1);
}

int main(){
        double x;

        _LIB_VERSION = _SVID_;

        x = sqrt(-1.0);
        printf("x=%f\n", x);
        return 0;
}

Andries

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