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/* $OpenBSD: fpsig.c,v 1.2 2005/07/15 07:28:33 otto Exp $ */
/*
* Public domain. 2005, Otto Moerbeek
*
* Try to check if fp registers are properly saved and restored while
* calling a signal hander. This is not supposed to catch all that
* can go wrong, but trashed fp registers will typically get caught.
*/
#include <err.h>
#include <signal.h>
#include <unistd.h>
#define LIMIT 10.0
volatile sig_atomic_t count;
volatile double g1;
volatile double g2;
void
handler(int signo)
{
double a, b, c = 0.0;
if (signo)
alarm(1);
for (a = 0.0; a < LIMIT; a++)
for (b = 0.0; b < LIMIT; b++)
c += a * a + b * b;
if (signo) {
g1 = c;
count++;
} else
g2 = c;
}
int
main()
{
signal(SIGALRM, handler);
/* initialize global vars */
handler(0);
handler(1);
while (count < 10) {
handler(0);
if (g1 != g2)
errx(1, "%f %f", g1, g2);
}
return (0);
}
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