resizecons

RESIZECONS(8)                   Console Support                  RESIZECONS(8)



NAME
       resizecons - change kernel idea of the console size

SYNOPSIS
       resizecons COLSxROWS
       resizecons -lines ROWS

DESCRIPTION
       The resizecons command tries to change the videomode of the console.
       There are several aspects to this: (a) the kernel must know about it,
       (b) the hardware must know about it, (c) user programs must know about
       it, (d) the console font may have to be adapted.

       (a) The kernel is told about the change using the ioctl VT_RESIZE.
       This causes the kernel to reallocate console screen memory for all
       virtual consoles, and might fail if there is not enough memory.  (In
       that case, try to disallocate some virtual consoles first.)  If this
       ioctl succeeds, but a later step fails (e.g., because you do not have
       root permissions), you may be left with a very messy screen.

       The most difficult part of this is (b), since it requires detailed
       knowledge of the video card hardware, and the setting of numerous
       registers. Only changing the number of rows is slightly easier, and
       resizecons will try to do that itself, when given the -lines option.
       (Probably, root permission will be required.)  The command resizecons
       COLSxROWS will execute restoretextmode -r COLSxROWS (and hence requires
       that you have svgalib installed). Here COLSxROWS is a file that was
       created earlier by restoretextmode -w COLSxROWS.  Again, either root
       permissions are required, or restoretextmode has to be suid root.

       In order to deal with (c), resizecons does a `stty rows ROWS cols COLS'
       for each active console (in the range tty0..tty15), and sends a
       SIGWINCH signal to selection if it finds the file /tmp/selection.pid.

       Finally, (d) is dealt with by executing a setfont command. Most likely,
       the wrong font is loaded, and you may want to do another setfont
       yourself afterwards.


BUGS
       resizecons does not work on all hardware.  This command used to be
       called resize, but was renamed to avoid conflict with another command
       with the same name.


SEE ALSO
       setfont(8), stty(1), selection(1), restoretextmode(8), disalloc(8)




Local                             17 Jan 1995                    RESIZECONS(8)