内存损坏 [英] memory corruption

问题描述

我正在运行一个小型C程序:

i was running a small c program:

#include<stdio.h>
int main()
{
char *p;
p = (char *)malloc(10);
free(p);
free(p);
free(p);
printf("\npointer is freed!!\n");
}

基本上，我正在释放已经释放的内存. 我认为应该导致核心转储！不是吗?

basically i am freeing the memory which has already been freed. i think should result in a core dump!!is it not so?

但它正在打印

pointer is freed!!

我在某些地方错了吗?

推荐答案

根据手册页，如果以前已经调用过free(ptr)，则会发生未定义的行为."

As per the man page, "if free(ptr) has already been called before, undefined behavior occurs."

它不需要炸毁； 不做任何事情"是完全可以接受的不确定行为.也是鼻恶魔.不要依赖它.

It doesn't need to blow up; "not doing anything" is perfectly acceptable undefined behaviour. Also are nasal demons. Don't rely on it.

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