sigsegv-recover-with-setjmp.c

#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>

char *c;
sigjmp_buf jbuf;

void sighandler(int signumber) {
	printf("got signal %d (%s)\n", signumber,
			sys_siglist[signumber]);

	c = (char*)malloc(sizeof(char));
	siglongjmp(jbuf, 2);
}

int main(int argc, char **argv) {
	void (*h)(int);

	h = signal(SIGSEGV, sighandler);
	assert(h != SIG_ERR);

	sigsetjmp(jbuf, 0);
	/* force reload of 'c' with volatile cast */
	*((volatile char *)c) = '0'; /*segmentation fault*/

	printf("my pid is %d\n", getpid());
	printf("press any key to resume\n");
	getchar();

	return 0;
}