Linux环境编程之进程(三)：函数间跳转
浏览数：23 /
时间：2015年06月20日
引言：在编写程序时，经常在函数内部使用goto语句来跳转，从而进行出错处理，那么如果想要在函数之间进行跳转该怎么做呢？使用setjmp和longjmp函数。
给出示例程序：
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
static void f1(int, int, int, int);
static void f2(void);
static jmp_buf jmpbuffer;
static int globval;
int
main(void)
{
int autoval;
register int regival;
volatile int volaval;
static int statval;
globval = 1;
autoval = 2;
regival = 3;
volaval = 4;
statval = 5;
if(setjmp(jmpbuffer) != 0){
printf("after longjmp:\n");
printf("global = %d, autoval = %d, regival = %d, volaval = %d, statval = %d\n",
globval, autoval, regival, volaval, statval);
exit(0);
}
/*
* Change variable after setjmp, buf before longjmp.
*/
globval = 95;
autoval = 96;
regival = 97;
volaval = 98;
statval = 99;
f1(autoval, regival, volaval, statval);/*never returns*/
exit(0);
}
static void
f1(int i, int j, int k, int l)
{
printf("in f1():\n");
printf("global = %d, autoval = %d, regival = %d, volaval = %d, statval = %d\n",
globval,i, j, k, l);
f2();
}
static void
f2(void)
{
longjmp(jmpbuffer, 1);
}编译程序测试结果：
in f1(): global = 95, autoval = 96, regival = 97, volaval = 98, statval = 99 after longjmp: global = 95, autoval = 96, regival = 97, volaval = 98, statval = 99
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