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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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RESIZECONS(8) System Manager's Manual RESIZECONS(8)
resizecons - change kernel idea of the console size
resizecons COLSxROWS
resizecons -lines ROWS
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.
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.
setfont(8), stty(1), selection(1), restoretextmode(8),
disalloc(8)
This page is part of the kbd (Linux keyboard tools) project.
Information about the project can be found at
⟨http://www.kbd-project.org/⟩. If you have a bug report for this
manual page, send it to kbd@lists.altlinux.org. This page was
obtained from the project's upstream Git repository
⟨https://github.com/legionus/kbd.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-05-20.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
kbd 17 Jan 1995 RESIZECONS(8)
Pages that refer to this page: ioctl_console(2), ioctl_vt(2), console_codes(4)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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