在C程序中设置堆的开始地址？ [英] Set the heap start address in C program?

问题描述

有没有办法在linux中设置GCC编译C程序中的堆起始地址？在x86_64系统中，我的测试程序将堆地址设置为4字节的引用地址（小于FFFFFFFF）。我想将它设置为8字节的引用地址进行一些测试（> FFFFFFFF）。 GCC是否提供了设置堆起始地址的方法？

Is there a way to set the heap start address in GCC compiled C program in linux? In x86_64 system,my test program sets the heap address to 4 byte referenced address ( less than FFFFFFFF). I want to set this to 8 byte referenced address for some testing ( > FFFFFFFF). Does GCC provide any way to set the heap start address?

推荐答案

您可以使用 sbrk（）

You can do this a bit indirectly using sbrk():

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(void)
{
  sbrk(0xFFFFFFFF);
  printf("%p\n", malloc(1));
  return 0;
}

这个工作原理是在开始时分配0xFFFFFFFF字节，这样接下来的事情 malloc（）可以分配的是更高的地址。

This works by "allocating" 0xFFFFFFFF bytes at the very start, so that the next thing malloc() can allocate is a higher address.

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