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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | COLOPHON |
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ioctl_vt(2) System Calls Manual ioctl_vt(2)
ioctl_vt - ioctls for console terminal and virtual consoles
#include <linux/vt.h> /* Definition of VT_* constants */
#include <sys/ioctl.h>
int ioctl(int fd, unsigned long op, void *argp);
The following Linux-specific ioctl(2) operations are supported
for console terminals and virtual consoles.
VT_OPENQRY
Returns the first available (non-opened) console. argp
points to an int which is set to the number of the vt (1
<= *argp <= MAX_NR_CONSOLES).
VT_GETMODE
Get mode of active vt. argp points to a
struct vt_mode {
char mode; /* vt mode */
char waitv; /* if set, hang on writes if not active */
short relsig; /* signal to raise on release op */
short acqsig; /* signal to raise on acquisition */
short frsig; /* unused (set to 0) */
};
which is set to the mode of the active vt. mode is set to
one of these values:
VT_AUTO auto vt switching
VT_PROCESS process controls switching
VT_ACKACQ acknowledge switch
VT_SETMODE
Set mode of active vt. argp points to a struct vt_mode.
VT_GETSTATE
Get global vt state info. argp points to a
struct vt_stat {
unsigned short v_active; /* active vt */
unsigned short v_signal; /* signal to send */
unsigned short v_state; /* vt bit mask */
};
For each vt in use, the corresponding bit in the v_state
member is set. (Linux 1.0 through Linux 1.1.92.)
VT_RELDISP
Release a display.
VT_ACTIVATE
Switch to vt argp (1 <= argp <= MAX_NR_CONSOLES).
VT_WAITACTIVE
Wait until vt argp has been activated.
VT_DISALLOCATE
Deallocate the memory associated with vt argp. (Since
Linux 1.1.54.)
VT_RESIZE
Set the kernel's idea of screensize. argp points to a
struct vt_sizes {
unsigned short v_rows; /* # rows */
unsigned short v_cols; /* # columns */
unsigned short v_scrollsize; /* no longer used */
};
Note that this does not change the videomode. See
resizecons(8). (Since Linux 1.1.54.)
VT_RESIZEX
Set the kernel's idea of various screen parameters. argp
points to a
struct vt_consize {
unsigned short v_rows; /* number of rows */
unsigned short v_cols; /* number of columns */
unsigned short v_vlin; /* number of pixel rows
on screen */
unsigned short v_clin; /* number of pixel rows
per character */
unsigned short v_vcol; /* number of pixel columns
on screen */
unsigned short v_ccol; /* number of pixel columns
per character */
};
Any parameter may be set to zero, indicating "no change",
but if multiple parameters are set, they must be self-
consistent. Note that this does not change the videomode.
See resizecons(8). (Since Linux 1.3.3.)
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.
Linux.
ioctl(2), ioctl_console(2)
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Linux man-pages 6.9.1 2024-06-13 ioctl_vt(2)
Pages that refer to this page: ioctl_console(2)
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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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