ioctl-opt 1.2

Pythonified linux asm-generic/ioctl.h .

So you can replicate driver’s code computing fcntl.ioctl’s opt argument.

Example defining hidraw ioctls:

import ctypes
from ioctl_opt import IOR, IOC, IOC_READ, IOC_WRITE

# hid.h
HID_MAX_DESCRIPTOR_SIZE = 4096

# hidraw.h
class hidraw_report_descriptor(ctypes.Structure):
    _fields_ = [
        ('size', ctypes.c_uint),
        ('value', ctypes.c_ubyte * HID_MAX_DESCRIPTOR_SIZE),
    ]

class hidraw_devinfo(ctypes.Structure):
    _fields_ = [
        ('bustype', ctypes.c_uint),
        ('vendor', ctypes.c_short),
        ('product', ctypes.c_short),
    ]

HIDIOCGRDESCSIZE = IOR(ord('H'), 0x01, ctypes.c_int)
HIDIOCGRDESC = IOR(ord('H'), 0x02, hidraw_report_descriptor)
HIDIOCGRAWINFO = IOR(ord('H'), 0x03, hidraw_devinfo)
HIDIOCGRAWNAME = lambda len: IOC(IOC_READ, ord('H'), 0x04, len)
HIDIOCGRAWPHYS = lambda len: IOC(IOC_READ, ord('H'), 0x05, len)
HIDIOCSFEATURE = lambda len: IOC(IOC_WRITE|IOC_READ, ord('H'), 0x06, len)
HIDIOCGFEATURE = lambda len: IOC(IOC_WRITE|IOC_READ, ord('H'), 0x07, len)