I am not able to find ioctl-numbers.txt in the Documentation directory in kernel directory in /usr/src.

Where is it?

  • What makes you think you should find ioctl-numbers.txt? – waltinator Mar 28 '18 at 14:04

The heavier parts of the documentation are shipped in a separate package, called linux-doc. You can find the compressed file in /usr/share/doc/linux-doc/ioctl/ioctl-number.txt.gz after installing that package.

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