C语言库longjmp()函数

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

int main () {
   int val;
   jmp_buf env_buffer;

   /* save calling environment for longjmp */
   val = setjmp( env_buffer );

   if( val != 0 ) {
      printf("Returned from a longjmp() with value = %s/n", val);
      exit(0);
   }
   printf("Jump function call/n");
   jmpfunction( env_buffer );

   return(0);
}

void jmpfunction(jmp_buf env_buf) {
   longjmp(env_buf, "yiibai.com");
}