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    "info": {
        "author": "Vincent Pelletier",
        "author_email": "plr.vincent@gmail.com",
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            "Intended Audience :: Information Technology",
            "License :: OSI Approved :: GNU General Public License (GPL)",
            "Operating System :: POSIX :: Linux",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 3"
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        "description": "Pythonified linux ``asm-generic/ioctl.h`` .\n\nSo you can replicate driver's code computing ``fcntl.ioctl``'s ``opt`` argument.\n\nFor example, starting from the following IOCTL declaration (taken from ``input.h``):\n\n.. code:: C\n\n  #include <sys/ioctl.h>\n  #define EVIOCGNAME(len) _IOC(_IOC_READ, 'E', 0x06, len) /* get device name */\n  \nyou could write the following:\n\n.. code:: python\n\n  from ioctl_opt import IOC, IOC_READ\n  EVIOCGNAME = lambda length: IOC(IOC_READ, ord('E'), 0x06, length)\n\nThe differences are minimal, and all come from python language or coding style:\n\n- macros/constants to use from ``ioctl_opt`` for not start with an underscore\n- defined macro becomes a callable (here a lambda, could be function)\n- ``IOC``'s ``nr`` argument has to be an integer, so C's single-quote char becomes an ``ord`` call\n- avoid shadowing built-in ``len`` function\n\nYou may want to then write a pythonic function to conveniently access that ioctl:\n\n.. code:: python\n\n  import ctypes\n  import fcntl\n  \n  def getDeviceName(fd, length=1024):\n      name = (ctypes.c_char * length)()\n      actual_length = fcntl.ioctl(fd, EVIOCGNAME(length), name, True)\n      if actual_length < 0:\n          raise OSError(-actual_length)\n      if name[actual_length - 1] == b'\\x00':\n          actual_length -= 1\n      return name[:actual_length]\n\nMore advanced example defining hidraw ioctls, requiring structures (for more on how structures are defined, check python's ctype documentation for your python version):\n\n.. code:: python\n\n  import ctypes\n  from ioctl_opt import IOR, IOC, IOC_READ, IOC_WRITE\n\n  # hid.h\n  HID_MAX_DESCRIPTOR_SIZE = 4096\n\n  # hidraw.h\n  class hidraw_report_descriptor(ctypes.Structure):\n      _fields_ = [\n          ('size', ctypes.c_uint),\n          ('value', ctypes.c_ubyte * HID_MAX_DESCRIPTOR_SIZE),\n      ]\n\n  class hidraw_devinfo(ctypes.Structure):\n      _fields_ = [\n          ('bustype', ctypes.c_uint),\n          ('vendor', ctypes.c_short),\n          ('product', ctypes.c_short),\n      ]\n\n  HIDIOCGRDESCSIZE = IOR(ord('H'), 0x01, ctypes.c_int)\n  HIDIOCGRDESC = IOR(ord('H'), 0x02, hidraw_report_descriptor)\n  HIDIOCGRAWINFO = IOR(ord('H'), 0x03, hidraw_devinfo)\n  HIDIOCGRAWNAME = lambda length: IOC(IOC_READ, ord('H'), 0x04, length)\n  HIDIOCGRAWPHYS = lambda length: IOC(IOC_READ, ord('H'), 0x05, length)\n  HIDIOCSFEATURE = lambda length: IOC(IOC_WRITE|IOC_READ, ord('H'), 0x06, length)\n  HIDIOCGFEATURE = lambda length: IOC(IOC_WRITE|IOC_READ, ord('H'), 0x07, length)\n",
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