[issue22698] Add constants for ioctl request codes

[M. Levinson]

M. Levinson added the comment:

In addition to ioctl constants from Linux, it would also be very helpful
to add the constants from NetBSD et al. that are described in their ioctl(2) man page: http://man.netbsd.org/man/ioctl+2+NetBSD-current

Thank you!

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nosy: +mrl

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