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setjmp???????????????????longjmp????????setjmp???????????????jump_buf????????????longjmp?????setjmp????????

?????setjmp????????null?????setjmp????????????????????????setjmp???????longjmp?????????????????????????????setjmp?????longjmp????????????setjmp?????????????????????

???????setjmp???????????????if?switch?while?????????????????????????????

???????setjmp?longjmp????

#include 
   
    
#include 
    
     
static jmp_buf jump_buffer;
noreturn void a(int count) {
    ("a(%d) called\n", count);
    longjmp(jump_buffer, count + 1);
}
int main(void) {
    volatile int count = 0;
    if (setjmp(jump_buffer) != 9) {
        a(count++);
    }
}
    
   

???????setjmp?????????????setjmp?????9?????????a???count?????a????longjmp??????????????setjmp????????????

???????

a(0) called
a(1) called
a(2) called
a(3) called
a(4) called
a(5) called
a(6) called
a(7) called
a(8) called

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