[CLUE-Tech] URL for ioctl TIOS functions?

[David Anselmi]

Well, I don't know squat about this.  So tell me whether I'm close or not...

I poked around in the kernel source - TIOCMBI[SC] seems to be for setting or
clearing bits in the modem control register (async_struct->MCR).  A look on
yahoo for 'modem control register' turns up some hits that are pretty greek
to me.  But this one looks promising:
http://www.beyondlogic.org/serial/serial.htm

Seems that TIOCM{GET,SET} either sets or gets the whole async_struct.  If
you've seen examples, you're way ahead of me.  async_struct is defined in a
file called linux/serialP.h.  Again, maybe the website helps.

Is that any use, or did you already know all of it?

Dave

"Jed S. Baer" wrote:

> Greetings all.
>
> After spending some time finding all manner of websites not having this
> data ...
>
> Does anyone know where the documentation is for the serial IO calls to
> ioctl()? Specifically:
>
>        0x00005415  TIOCMGET               int *
>        0x00005416  TIOCMBIS               const int *
>        0x00005417  TIOCMBIC               const int *
>        0x00005418  TIOCMSET               const int *
>
> (from "man ioctl_list")
>
> Or, to put it another way, I'm trying to write a slightly more useful
> modem-line toggling proggy (for playing with my UPS) than what I've seen
> in the UPS-HOWTO. The only examples I've found are in the UPS-HOWTO, and
> deal with only the CMSET/CMGET functions. Seems there ought to be a
> CMCLR (clear signal) as well, eh -- maybe that's what CMBIC does. (I
> never thought I'd need a break-out box again ;-)
>
> Anyway, the Serial-Programming-HOWTO doesn't seem to cover this stuff,
> nor any man pages I can find.
>
> TIA
> Regards,
> jed