在什么地方存储操作系统的命令行参数？ [英] Where does the OS store the command line arguments?

问题描述

我的工作在Linux上。在内存部分是存储的命令行参数（堆栈或堆）？

我试图执行免费（argv的），我得到一个分段错误。这是为什么？

解决方案

  

我试图执行免费（argv的），我得到一个分段错误。这是为什么？

您只能免费你的malloc / 释放calloc （也可能是的realloc 以后）。试图免费别的调用未定义行为。一个（好）的方式UB表现是产生分段错误;一个（坏）的方式是使程序出现预期的工作。

至于他们在哪里...读的 C99标准 - 。它的未指定

  的串指向的argv数组应
  能够MODI网络的计划，并保留节目之间的最后存储的值
  启动和终止程序。

I am working on Linux. In which section of memory are the command line arguments stored (stack or heap)?

I tried to execute free(argv) and I got a segmentation fault. Why is that?

解决方案

I tried to execute free(argv) and I got a segmentation fault. Why is that?

You can only free what you malloc/calloc (and possibly realloc later on). Trying to free something else invokes Undefined Behaviour. One (good) way UB manifests itself is by producing a segmentation fault; a (bad) way is to make the program appear to work as intended.

As to where they are ... read section 5.1.2.2.1 of the C99 Standard -- its unspecified.

the strings pointed to by the argv array shall be modifiable by the program, and retain their last-stored values between program startup and program termination.

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