testjmp.c

该代码为unix环境高级编程的源代码

#include	<setjmp.h>
#include	"ourhdr.h"

static void	f1(int, int, int);
static void	f2(void);

static jmp_buf	jmpbuffer;

int
main(void)
{
	int				count;
	register int	val;
	volatile int	sum;

	count = 2; val = 3; sum = 4;
	if (setjmp(jmpbuffer) != 0) {
		printf("after longjmp: count = %d, val = %d, sum = %d\n",
				count, val, sum);
		exit(0);
	}
	count = 97; val = 98; sum = 99;
				/* changed after setjmp, before longjmp */
	f1(count, val, sum);		/* never returns */
}

static void
f1(int i, int j, int k)
{
	printf("in f1(): count = %d, val = %d, sum = %d\n", i, j, k);
	f2();
}

static void
f2(void)
{
	longjmp(jmpbuffer, 1);
}