Re: Weirdness in TTY & VT

[Lundberg, Johannes]

Thanks for the feedback. I solved it by asking for next free vt (#nr) and
then simply opening /dev/ttyv[#nr+1].


On Thu, Sep 8, 2016 at 10:36 AM, Jilles Tjoelker  wrote:

> On Fri, Sep 02, 2016 at 05:12:12PM -0700, Lundberg, Johannes wrote:
> > I'm porting some Linux code and have some weird behavior.
>
> > In this (Linux) code fstat() and minor() is used on a /dev/tty file
> > descriptor to get a tty number to map to. In FreeBSD this returns a
> number
> > around 60-70 for st_rdev which means VT_ACTIVATE ioctl call will fail
> > because it only allows values 0-12.
>
> > Should not this be compatible with FreeBSD? If not, what is the FreeBSD
> way
> > to do this?
>
> > Is there some implementation missing in vt?
>
> minor() and major() are obsolete in FreeBSD. A (userland) dev_t is an
> opaque identifier.
>
> The direct equivalent is devname_r() or fdevname_r() followed by parsing
> the resulting string.
>
> There is also a VT_GETINDEX ioctl but I don't know whether it works.
>
> --
> Jilles Tjoelker
>

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Re: Weirdness in TTY & VT

[Jilles Tjoelker]

On Fri, Sep 02, 2016 at 05:12:12PM -0700, Lundberg, Johannes wrote:
> I'm porting some Linux code and have some weird behavior.

> In this (Linux) code fstat() and minor() is used on a /dev/tty file
> descriptor to get a tty number to map to. In FreeBSD this returns a number
> around 60-70 for st_rdev which means VT_ACTIVATE ioctl call will fail
> because it only allows values 0-12.

> Should not this be compatible with FreeBSD? If not, what is the FreeBSD way
> to do this?

> Is there some implementation missing in vt?

minor() and major() are obsolete in FreeBSD. A (userland) dev_t is an
opaque identifier.

The direct equivalent is devname_r() or fdevname_r() followed by parsing
the resulting string.

There is also a VT_GETINDEX ioctl but I don't know whether it works.

-- 
Jilles Tjoelker
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Re: Weirdness in TTY & VT

[Edward Tomasz Napierała]

On 0902T1712, Lundberg, Johannes wrote:
> ​Hi
> 
> I'm porting some Linux code and have some weird behavior.
> 
> In this (Linux) code fstat() and minor() is used on a /dev/tty file
> descriptor to get a tty number to map to. In FreeBSD this returns a number
> around 60-70 for st_rdev which means VT_ACTIVATE ioctl call will fail
> because it only allows values 0-12.
> 
> Should not this be compatible with FreeBSD? If not, what is the FreeBSD way
> to do this?
> 
> Is there some implementation missing in vt?

Device numbers don't really matter in FreeBSD.  To get the current
VT number, use VT_GETACTIVE ioctl.  Take a look at vidcontrol(1)
source to see how it's done ("vidcontrol -i active").

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Weirdness in TTY & VT

[Lundberg, Johannes]

​Hi

I'm porting some Linux code and have some weird behavior.

In this (Linux) code fstat() and minor() is used on a /dev/tty file
descriptor to get a tty number to map to. In FreeBSD this returns a number
around 60-70 for st_rdev which means VT_ACTIVATE ioctl call will fail
because it only allows values 0-12.

Should not this be compatible with FreeBSD? If not, what is the FreeBSD way
to do this?

Is there some implementation missing in vt?

Thanks!

​

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