[C++] 纯文本查看 复制代码
#include <stdio.h>
#include <setjmp.h>
#include <signal.h>
#include <unistd.h>
#define ENV_UNSAVE 0
#define ENV_SAVED 1
int flag_saveenv = ENV_UNSAVE;
jmp_buf env;
int flag = 0;
void handler_sigrtmin15(int signo)
{
if (flag_saveenv == ENV_UNSAVE) {
printf("进入到信号处理函数\n");
flag = 1;
return;
}
printf("recv SIGRTMIN+15\n");
sleep(10);
printf("in handler_sigrtmin15, after sleep\n");
siglongjmp(env, 1); //返回到env处,注意第二个参数的值
}
int main()
{
/*设置返回点*/
switch (sigsetjmp(env, 1)) { /*sigsetjmp的第二个参数只要非 0 即可*/
case 0:
printf("return 0\n");
if (flag == 1) {
printf("没通过siglongjmp() 而回到 case 0\n");
flag = 0;
}
// flag_saveenv = ENV_SAVED;
break;
case 1:
if (flag == 1) {
printf("没通过siglongjmp() 而回到case 1\n");
flag = 0;
}
printf("return from SIGRTMIN+15\n");
break;
default:
if (flag == 1) {
printf("没通过siglongjmp() 而回到case default\n");
flag = 0;
}
printf("return else\n");
break;
}
if (flag == 1) {
printf("没通过siglongjmp() 而回到 signal() 之前\n");
flag = 0;
}
signal(SIGRTMIN+15, handler_sigrtmin15);
if (flag == 1) {
printf("没通过siglongjmp() 而回到 signal() 之后\n");
flag = 0;
}
while(1)
;
return 0;
}