c - 使用 clone() 时出现无效参数错误

Question

我正在使用这个函数调用 clone()

clone (fun, (char*)stack + 0x500000, SIGCHLD | CLONE_FILES | CLONE_FS, arg);

其中 fun 是一个函数:int fun(void*)， stack = malloc(0x500000)，arg是void*类型。

我想知道无效参数错误的其他可能原因是什么。

我检查过堆栈不为 NULL。

Answer 1

人类克隆:

  The  child_stack  argument  specifies the location of the stack used by
   the child process.  Since the child and calling process may share  mem‐
   ory,  it  is  not possible for the child process to execute in the same
   stack as the calling process.  The calling process must  therefore  set
   up memory space for the child stack and pass a pointer to this space to
   clone().  Stacks grow downward on all processors that run Linux (except
   the  HP  PA  processors),  so child_stack usually points to the topmost
   address of the memory space set up for the child stack.