读取和写入存储位置 [英] Read and write to a memory location

问题描述

在 Google 中做了很多研究之后，我发现下面的程序

After doing lot of research in Google, I found below program

#include <stdio.h>

int main()
{
    int val;
    char *a = (char*) 0x1000;
    *a = 20;
    val = *a;
    printf("%d", val);
}

但是它会抛出运行时间错误，在 * a = 20 。

But it is throwing a run time error, at *a = 20.

然后我该如何读写特定的内存

Then how can I write and read a specific memory location?

请帮助我

推荐答案

这会抛出<应当正确使用href = http://en.wikipedia.org/wiki/Segmentation_fault rel = noreferrer>段违规（SEGFAULT），因为您不知道该地址中的内容。最有可能的是内核空间，并且托管环境不希望您随意写入另一个应用程序的内存。您只应该向内存中写入您知道程序可以访问的内存，否则在运行时将发生莫名其妙的崩溃。

This is throwing a segment violation (SEGFAULT), as it should, as you don't know what is put in that address. Most likely, that is kernel space, and the hosting environment doesn't want you willy-nilly writing to another application's memory. You should only ever write to memory that you KNOW your program has access to, or you will have inexplicable crashes at runtime.

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