From owner-freebsd-hackers@FreeBSD.ORG  Fri Dec 24 16:08:19 2010
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From: Mohammad Hedayati <hedayati.mo@gmail.com>
Date: Fri, 24 Dec 2010 19:37:37 +0330
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Subject: Re: Inappropriate ioctl for device
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On Fri, Dec 24, 2010 at 7:31 PM, Gary Jennejohn
<gljennjohn@googlemail.com>wrote:

> On Fri, 24 Dec 2010 18:17:18 +0330
> Mohammad Hedayati <hedayati.mo@gmail.com> wrote:
>
> > 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
>
> Carefully read ioctl(2) and consider that you're passing in 0 as the cmd.
> If you still don't understand your error, post again.
>
> Hint: look at /sys/kern/sys_generic.c:^ioctl
>
> --
> Gary Jennejohn
>

It was a misspelling, I'm doing as bellow, if you mean the u_long.

unsinged long cmd = 0;
len = ioctl(cd, cmd);