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From: Mohammad Hedayati <hedayati.mo@gmail.com>
Date: Fri, 24 Dec 2010 16:35:02 +0330
Message-ID: <AANLkTikYuYEJ+48xz1qOe2p6Ev-C-WWCqbjO31PPZueQ@mail.gmail.com>
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Subject: Inappropriate ioctl for device
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X-List-Received-Date: Fri, 24 Dec 2010 13:32:13 -0000

I'm writing a simple char device. So far everything went so good
(read/write), but here I'm going to add support for ioctl.

int
ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
{
     int error = 0;
     uprintf("Here...\n");
     return(error);
}
and I'm calling it here:

len = ioctl(cd, 0);
perror("ioctl");

but when runnig it says:

ioctl: Inappropriate ioctl for device

where's the problem?