09-05-2016
Before attempting ANYTHING that hits the hardware hard, read up on any protocols required for the USB ports, plus how they work and this includes the keyboard and mouse for those ports too. KB and mouse use USB version 1.1, [1.0?], minimum and do not require I/O speeds greater than about 1.5Mbs data rate.
In Linux flavours, or at least most, there are __accessable__ devices that can be read from and/or written to. I have no idea if this is true of professional UNIX tools however. The protocol for the keyboards being sent and received can be read easily using basic code in differing languages but not necessarily sync'd at all. The data being sent by the KB has many bytes in it in binary form; the same goes for the pointing device,(mouse).
Writing to a USB port via one of these devices is not the same animal however.
Unless you have at least studied how this/these __serial__ interfaces work be careful as they are __effectively__ in __parallel__. As bakunin has implied these could be allocated tty[?] device names in the UNIX domain but can be COM[?], usually COM1 and COM2 for KB and mouse respectively, in the Windows domain, but I have no idea what they are in the Apple OSX !0.7.x and above domain, perhaps also tty[?]. The Linux domains could be special devices and/or tty[?].
IMO it is certainly not an easy task for a novice to intercept a second KB's I/O and redirect from its main duty as user input on any machine in question.
(I would like to be proven wrong however.)
Bazza.
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UMS(4) BSD Kernel Interfaces Manual UMS(4)
NAME
ums -- USB mouse driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device ums
device uhci
device ohci
device usb
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ums_load="YES"
DESCRIPTION
The ums driver provides support for mice that attach to the USB port. Supported are mice with any number of buttons and mice with a wheel.
The /dev/ums0 device presents the mouse as a sysmouse or mousesystems type device. See moused(8) for an explanation of these mouse types.
FILES
/dev/ums0 blocking device node
EXAMPLES
Use the first USB mouse on the system as your console mouse:
moused -p /dev/ums0 -t auto
To be able to use the USB mouse under X, change the "Pointer" section in xorg.conf to the following:
Device /dev/ums0
Protocol Auto
If you want to be able to use the mouse in both virtual consoles as well as in X change it to:
Device /dev/sysmouse
Protocol Auto
SEE ALSO
ohci(4), sysmouse(4), uhci(4), usb(4), xorg.conf(5) (ports/x11/xorg), moused(8)
AUTHORS
The ums driver was written by Lennart Augustsson <augustss@cs.chalmers.se> for NetBSD and was adopted for FreeBSD by MAEKAWA Masahide
<bishop@rr.iij4u.or.jp>.
This manual page was written by Nick Hibma <n_hibma@FreeBSD.org> with input from Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>.
BSD
November 27, 2006 BSD