目录一、为什么需要IS_ERR？二、IS_ERR的原理三、实际使用场景四、常见错误及调试技巧五、底层实现解析（ include/linux/err.h）六、总结一、为什么需要IS_ERR？
I\'m a desktop application developer, and I plan learning html5, but as it\'s not released, there are (almost) no published books and not too much infomation for beginners on the web... I feel I shoul
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