如何查找unregister_chrdev()调用是否成功 [英] how to find if unregister_chrdev() call was successful

问题描述

unregister_chrdev()调用用于返回0(如果成功)，而返回<0.但是现在，在较新的内核版本中，该函数的返回值已更改为void，因此它不再返回任何东西.

unregister_chrdev() call from [linux\fs.h] used to return 0 if successful and <0 other wise. But now, in newer kernel versions, the return value of the function has been changed to void so it no longer returns any thing.

问题:有什么方法可以找出unregister_chrdev()调用是否成功?

Question: Is there any way to find out if the unregister_chrdev() call was successful or not?

推荐答案

void的返回是通过更改集完成的:e53252d97e670a38b1d2e9723b48077bba11ddda

The return of void was done by changeset: e53252d97e670a38b1d2e9723b48077bba11ddda

commit e53252d97e670a38b1d2e9723b48077bba11ddda
Author: Akinobu Mita 
Date:   Thu Jul 19 01:47:51 2007 -0700

    unregister_chrdev() return void

    unregister_chrdev() does not return meaningful value.  This patch makes it
    return void like most unregister_* functions.

实际上，如果您看过以前的代码(从2.6.12-rc2开始)，您会看到它总是返回0，因此这是一个总是希望成功的函数.

In fact if you look at the code before (from 2.6.12-rc2 onwards) you can see it always returned 0 so this is a function that is always expected to succeed.

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