IIUC, current ioctl is not capable of handling arbitrary argument types.
This code will allow any arg type (such as structures with pointers to
embedded structures).
The code for _IOC is taken from linux and might not be portable.
from ctypes import *
libc = CDLL ('/lib/libc.so.6')
#print libc.ioctl
def set_ioctl_argtype (arg_type):
libc.ioctl.argtypes = (c_int, c_int, arg_type)
_IOC_WRITE = 0x1
_IOC_NRBITS= 8
_IOC_TYPEBITS= 8
_IOC_SIZEBITS= 14
_IOC_DIRBITS= 2
_IOC_NRSHIFT= 0
_IOC_TYPESHIFT= (_IOC_NRSHIFT+_IOC_NRBITS)
_IOC_SIZESHIFT= (_IOC_TYPESHIFT+_IOC_TYPEBITS)
_IOC_DIRSHIFT= (_IOC_SIZESHIFT+_IOC_SIZEBITS)
def _IOC (dir, type, nr, size):
return (((dir) << _IOC_DIRSHIFT) | \
((type) << _IOC_TYPESHIFT) | \
((nr) << _IOC_NRSHIFT) | \
((size) << _IOC_SIZESHIFT))
def ioctl (fd, request, args):
return libc.ioctl (fd, request, args)
-------------------
Example usage:
from ioctl import *
set_ioctl_argtype (POINTER (eos_dl_args_t))
EOS_IOC_MAGIC = 0xF4
request = _IOC(_IOC_WRITE, EOS_IOC_MAGIC, 0x00, 0) # ignore size
err = ioctl (eos_file.fileno(), request, args)
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