/* * (C) Finite State Machine Labs Inc. 2000 business@fsmlabs.com * * Released under the terms of GPL 2. * Open RTLinux makes use of a patented process described in * US Patent 5,995,745. Use of this process is governed * by the Open RTLinux Patent License which can be obtained from * www.fsmlabs.com/PATENT or by sending email to * licensequestions@fsmlabs.com */#include <rtlinux_debug.h>#include <rtlinux_signal.h>#include <stdio.h>#include <errno.h>int count;volatile int *countP;void div0_generator(int whatever){	/* attempt to divide by zero - no, this doesn't return infinity */	*countP = 1 / 0;}int main(void){	struct rtlinux_sigaction mysig, oldsig;	int i = 5;	countP = &count;	mysig.sa_handler = div0_generator;	mysig.sa_flags = RTLINUX_SA_ONESHOT;	mysig.sa_period = NSECS_PER_SEC / 4;	if (rtlinux_sigaction(RTLINUX_SIGTIMER0, &mysig, &oldsig)) {		perror("rtlinux_sigaction");		return errno;	}	fprintf(stderr, "Restoring signal handler to default in %d\n", i);	while (i > 0) {		sleep(1);		i--;		fprintf(stderr, "%d\n", i);	}	mysig.sa_handler = RTLINUX_SIG_DFL;	if (rtlinux_sigaction(RTLINUX_SIGTIMER0, &mysig, &oldsig)) {		perror("rtlinux_sigaction");		return errno;	}	return 0;}