setjmp(),longjmp 例子

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#include <stdio.h>
#include <setjmp.h>
#include <stdlib.h>

static jmp_buf jmpbuffer1;
static jmp_buf jmpbuffer2;

static void longjump_f1(void);
static void longjump_f2(void);

int main(void)
{
	int test_auto = 0x55;
	static int test_static = 0x55;
	volatile int test_volatile = 0x55;

	int returnv = 0;
	static int flag = 0;

	if((returnv = setjmp(jmpbuffer1)) != 0)
	{
		printf("after jump1:\n");
		printf("test_auto = 0x%x,test_static = 0x%x,test_volatile = 0x%x\n"
			    ,test_auto,test_static,test_volatile);

		printf("returnv = %d\n", returnv);
		printf("flag = %d\n", flag);
		flag = 1;
		
	}

	if((returnv = setjmp(jmpbuffer2)) != 0)
	{
		printf("after jump2:\n");
		printf("test_auto = 0x%x,test_static = 0x%x,test_volatile = 0x%x\n"
			    ,test_auto,test_static,test_volatile);

		printf("returnv = %d\n", returnv);
		printf("flag = %d\n", flag);
		flag = 2;
	}
	
	test_auto = 0xaa;
	test_static = 0xaa;
	test_volatile = 0xaa;
	
	switch(flag)
	{
		case 0:
			longjump_f1();
			break;
		case 1:
			longjump_f2();
			break;
		default:
			exit(0);
	}
	
}

void longjump_f1(void)
{
	printf("longjum_f1()++\n");
	longjmp(jmpbuffer1,30);
	printf("longjum_f1()--\n");

}

void longjump_f2(void)
{
	printf("longjum_f2()++\n");
	longjmp(jmpbuffer2,40);
	printf("longjum_f2()--\n");

}