I want to be able to send IOCTL commands to standard devices (fdd,cdrom,kbd) from my
kernel driver. Whereas I can do reads and writes using the vn_rdwr commands, how do I
do IOCTLS? VOP_IOCTL keeps giving me EINVAL when I try to send the DIOCGDINFO IOCTL.
My code is basically
NDINIT(&_VdFloppyND, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/fd0", p);
vn_open(&_VdFloppyND, FREAD, 0);
osError = VOP_IOCTL(_VdFloppyND.ni_vp,
DIOCGDINFO,
(caddr_t)&dl,
0, // fflags ???
p->p_ucred,
p);
Questions:
1) Is there something I am doing wrong?
2) Should I use something else other than vn_open/vn_rdwr/VOP_*?
The error occurs regardless whether the floppy is mounted or not.
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