c++ / gcc : 捕获信号后 main 退出时出现分段错误

发布于 2024-09-13 12:23:47 字数 531 浏览 5 评论 0原文

以下代码在退出时触发分段错误。似乎只有当数据在“sigaction”调用和循环之间的堆栈上分配时才会发生：

#include <signal.h>
#include <unistd.h>

bool end = false;
void handler(int)  {
 end = true; 
}

int main()  {
 struct sigaction sigs;
 sigs.sa_handler = handler;
 sigaction(SIGINT, &sigs, NULL);

 int i;

 while (!end)
  sleep(1);
 return 0;
}

使用 ctrl-C

-> 运行并停止'int i' 行打开：分段错误

->没有行 'int i' : exit ok

(用 g++ v4.1.1 编译，操作系统 linux 内核 2.6.19)

听起来像是堆栈释放问题......有人有解释吗？

谢谢，

原文

The following code triggers a segmentation fault at exit.
It seems to happen only if data is allocated on the stack between the 'sigaction' call and the loop :

#include <signal.h>
#include <unistd.h>

bool end = false;
void handler(int)  {
 end = true; 
}

int main()  {
 struct sigaction sigs;
 sigs.sa_handler = handler;
 sigaction(SIGINT, &sigs, NULL);

 int i;

 while (!end)
  sleep(1);
 return 0;
}

Run and stop with ctrl-C

-> with line 'int i' on : segmentation fault

-> without line 'int i' : exit ok

(compiled with g++ v4.1.1, OS linux kernel 2.6.19)

sounds like a stack release problem ... anyone has an explanation ?

Thanks,

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南风几经秋 2024-09-20 12:23:47

您应该初始化 struct sigaction 的所有成员，以免冒着包含垃圾、标志等的风险。在那里改变 sigaction() 的行为
做

struct sigaction args = {};

或

memset(&args,0,sizeof args);

You should initialize all members of your struct sigaction ,as to not risk having it contain garbage, there's flags/etc. in there that alter the behavior of sigaction()
Do