问题描述
我在CLion中运行以下代码：
I run the following code in CLion:
int main()
{
char amessage [] = "oafaojfpa";
char * pmessage = "oafaojfpa";
char * apmessage = amessage;
amessage[2]='X';
*(pmessage+2)='X';
printf(amessage);
printf("\n");
printf(pmessage);
printf("\n");
printf(apmessage);
return(0);
}
代码 *（pmessage + 2）=' X'; 应该引发异常。但是，输出为：
The code *(pmessage+2)='X'; should raise exceptions. However, the output is:
/Users/spacegoing/Library/Caches/CLion12/cmake/generated/1ab7f406/1ab7f406/Debug/TCPL_Learn
Process finished with exit code 10
CLion仅表示退出代码10.但是在哪里可以看到异常消息？
CLion only says exit code 10. But where can I view the exception message?
推荐答案
只有c ++代码会引发异常。在这种情况下，您将遇到低级错误。您会看到一个C / OS返回值10，它是总线错误。
Only c++ code throws exceptions. In this case you are experiencing low level errors. You see a C/OS return value 10 which is BUS ERROR.
总线错误在x86上如今很少见，通常在您的处理器甚至无法尝试请求的内存访问时发生。 ：
Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt the memory access requested, typically:
- 使用地址不满足其对齐要求的处理器指令。
- 修改只读内存
您的指针消息指向字符串文字。该字符串存储在只读存储器中，尝试修改此存储器将导致未定义的行为。通常是段错误或总线错误。
Your pointer pmessage points to a string literal. This string is stored at read-only memory and trying to modify this memory leads to undefined behavior. It usually either segfaults or bus errors.
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