写入堆内存时调用的系统调用 [英] System call invoked when writing into a heap memory

问题描述

对于malloc sbrk，我知道被调用的系统调用是什么，类似地，当我写入槌状内存(堆内存)时，系统调用的是什么

I know for malloc sbrk is the system call invoked ,Similarly What is the system cal invoked when i write to a malloed memory(heap memory)

int main

{

  /* 10 byte of heap memory allocated */
  char *ptr = malloc(5);


  ptr[0] = 10;  // **What is the system call invoked for 
                    writing into this heap memory** ?????


}

推荐答案

在这种情况下，不涉及系统调用.请您的编译器生成程序集，以便您可以看到那里只有一些MOV指令.或者您可以使用调试器查看程序集

There are no system call involved in this case. Ask you compiler to generate assembly so that you can see that there is only some MOV instructions there. Or you can use a debugger to see the assembly

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