“EXPORT_SYMBOL"是什么意思?在 Linux 内核代码中? [英] What's meaning of "EXPORT_SYMBOL" in Linux kernel code?

问题描述

来自这里

 48 struct snd_card *snd_cards[SNDRV_CARDS];
 49 EXPORT_SYMBOL(snd_cards);

我不明白它的含义是什么以及为什么使用它.我试图搜索它，但不明白它的含义.

I am not getting whats the meaning of it and why that is used. I tried to search about it but not understanding the meaning of that.

推荐答案

它使动态加载的模块可以访问符号(前提是所述模块添加了 extern 声明).

It makes a symbol accessible to dynamically loaded modules (provided that said modules add an extern declaration).

不久前，有人问怎么用.

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