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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | COLOPHON |
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TIOCLINUX(2const) TIOCLINUX(2const)
TIOCLINUX - ioctls for console terminal and virtual consoles
#include <linux/tiocl.h> /* Definition of TIOCL_* constants */
#include <sys/ioctl.h>
int ioctl(int fd, TIOCLINUX, void *argp);
The action of the following ioctls depends on the first byte in
the struct pointed to by argp, referred to here as the subcode.
These are legal only for the superuser or the owner of the current
terminal.
subcode=0
Dump the screen. Disappeared in Linux 1.1.92. (With Linux
1.1.92 or later, read from /dev/vcsN or /dev/vcsaN
instead.)
subcode=1
Get task information. Disappeared in Linux 1.1.92.
subcode=TIOCL_SETSEL
Set selection. argp points to a
struct {
char subcode;
short xs, ys, xe, ye;
short sel_mode;
};
xs and ys are the starting column and row. xe and ye are
the ending column and row. (Upper left corner is
row=column=1.) sel_mode is 0 for character-by-character
selection, 1 for word-by-word selection, or 2 for line-by-
line selection. The indicated screen characters are
highlighted and saved in a kernel buffer.
Since Linux 6.7, using this subcode requires the
CAP_SYS_ADMIN capability.
subcode=TIOCL_PASTESEL
Paste selection. The characters in the selection buffer
are written to fd.
Since Linux 6.7, using this subcode requires the
CAP_SYS_ADMIN capability.
subcode=TIOCL_UNBLANKSCREEN
Unblank the screen.
subcode=TIOCL_SELLOADLUT
Sets contents of a 256-bit look up table defining
characters in a "word", for word-by-word selection. (Since
Linux 1.1.32.)
Since Linux 6.7, using this subcode requires the
CAP_SYS_ADMIN capability.
subcode=TIOCL_GETSHIFTSTATE
argp points to a char which is set to the value of the
kernel variable shift_state. (Since Linux 1.1.32.)
subcode=TIOCL_GETMOUSEREPORTING
argp points to a char which is set to the value of the
kernel variable report_mouse. (Since Linux 1.1.33.)
subcode=8
Dump screen width and height, cursor position, and all the
character-attribute pairs. (Linux 1.1.67 through Linux
1.1.91 only. With Linux 1.1.92 or later, read from
/dev/vcsa* instead.)
subcode=9
Restore screen width and height, cursor position, and all
the character-attribute pairs. (Linux 1.1.67 through Linux
1.1.91 only. With Linux 1.1.92 or later, write to
/dev/vcsa* instead.)
subcode=TIOCL_SETVESABLANK
Handles the Power Saving feature of the new generation of
monitors. VESA screen blanking mode is set to argp[1],
which governs what screen blanking does:
0 Screen blanking is disabled.
1 The current video adapter register settings are
saved, then the controller is programmed to turn off
the vertical synchronization pulses. This puts the
monitor into "standby" mode. If your monitor has an
Off_Mode timer, then it will eventually power down
by itself.
2 The current settings are saved, then both the
vertical and horizontal synchronization pulses are
turned off. This puts the monitor into "off" mode.
If your monitor has no Off_Mode timer, or if you
want your monitor to power down immediately when the
blank_timer times out, then you choose this option.
(Caution: Powering down frequently will damage the
monitor.) (Since Linux 1.1.76.)
subcode=TIOCL_SETKMSGREDIRECT
Change target of kernel messages ("console"): by default,
and if this is set to 0, messages are written to the
currently active VT. The VT to write to is a single byte
following subcode. (Since Linux 2.5.36.)
subcode=TIOCL_GETFGCONSOLE
Returns the number of VT currently in foreground. (Since
Linux 2.5.36.)
subcode=TIOCL_SCROLLCONSOLE
Scroll the foreground VT by the specified amount of lines
down, or half the screen if 0. lines is *(((int32_t
*)&subcode) + 1). (Since Linux 2.5.67.)
subcode=TIOCL_BLANKSCREEN
Blank the foreground VT, ignoring "pokes" (typing): can
only be unblanked explicitly (by switching VTs, to text
mode, etc.). (Since Linux 2.5.71.)
subcode=TIOCL_BLANKEDSCREEN
Returns the number of VT currently blanked, 0 if none.
(Since Linux 2.5.71.)
subcode=16
Never used.
subcode=TIOCL_GETKMSGREDIRECT
Returns target of kernel messages. (Since Linux 2.6.17.)
On success, 0 is returned (except where indicated). On failure,
-1 is returned, and errno is set to indicate the error.
EINVAL argp is invalid.
EPERM Insufficient permission.
Linux.
ioctl(2), ioctl_console(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. 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
Linux man-pages 6.10 2024-06-13 TIOCLINUX(2const)
Pages that refer to this page: ioctl_console(2), ioctl_tty(2)
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HTML rendering created 2025-02-02 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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