函数尝试使用错误的文件描述符（例如，它不引用打开的文件，或者用于尝试写入以只读方式打开的文件）。

EBADF -- A function tried to use a bad file descriptor (it doesn't refer to an open file, for example, or it was used in an attempt to write to a file that was opened read-only).

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注：fopen中使用的“r ”将指示文件以只读方式打开。

Note: the "r" used in fopen indicates that the file is open for reading only.

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以只读方式打开，放置在文件开头的文件指针。

Open for reading only; place the file pointer at the beginning of the file.

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以只读方式打开，放置在文件开头的文件指针。

Open for reading only; place the file pointer at the beginning of the file.

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