ioctls для консольного терминала и виртуальных консолей (ioctls for console terminal and virtual consoles)
Примечание (Note)
Warning: Do not regard this man page as documentation of the
Linux console ioctls. This is provided for the curious only, as
an alternative to reading the source. Ioctl's are undocumented
Linux internals, liable to be changed without warning. (And
indeed, this page more or less describes the situation as of
kernel version 1.1.94; there are many minor and not-so-minor
differences with earlier versions.)
Very often, ioctls are introduced for communication between the
kernel and one particular well-known program (fdisk, hdparm,
setserial, tunelp, loadkeys, selection, setfont, etc.), and their
behavior will be changed when required by this particular
program.
Programs using these ioctls will not be portable to other
versions of UNIX, will not work on older versions of Linux, and
will not work on future versions of Linux.
Use POSIX functions.
