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CONSOLE_IOCTLS !!!CONSOLE_IOCTLS NAME DESCRIPTION RETURN VALUES ERRORS WARNING SEE ALSO ---- !!NAME console ioctl's- ioctl's for console terminal and virtual consoles !!DESCRIPTION __WARNING: If you use the following information you are going to burn yourself.__ __WARNING: ioctl's are undocumented Linux internals, liable to be changed without warning. Use POSIX functions where available.__ The following Linux-peculiar __ioctl()__ requests are supported. Each requires a third argument, assumed here to be ''argp''. __KDGETLED__ Get state of LEDs. ''argp'' points to a long int. The lower three bits of ''*argp'' are set to the state of the LEDs, as follows: LED_CAP 0x04 caps lock led LEC_NUM 0x02 num lock led LED_SCR 0x01 scroll lock led __KDSETLED__ Set the LEDs. The LEDs are set to correspond to the lower three bits of ''argp''. However, if a higher order bit is set, the LEDs revert to normal: displaying the state of the keyboard functions of caps lock, num lock, and scroll lock. Before 1.1.54, the leds just reflected the state of the corresponding keyboard flags, and KDGETLED/KDSETLED would also change the keyboard flags. Since 1.1.54 the leds can be made to display arbitrary information, but by default they display the keyboard flags. The following two ioctl's are used to access the keyboard flags. __KDGKBLED__ Get keyboard flags !CapsLock, !NumLock, !ScrollLock (not lights). ''argp'' points to a char which is set to the flag state. The low order three bits (mask 0x7) get the current flag state, and the low order bits of the next nibble (mask 0x70) get the default flag state. (Since 1.1.54.) __KDSKBLED__ Set keyboard flags !CapsLock, !NumLock, !ScrollLock (not lights). ''argp'' has the desired flag state. The low order three bits (mask 0x7) have the flag state, and the low order bits of the next nibble (mask 0x70) have the default flag state. (Since 1.1.54.) __KDGKBTYPE__ Get keyboard type. This returns the value KB_101, defined as 0x02. __KDADDIO__ Add I/O port as valid. Equivalent to ioperm(arg,1,1). __KDDELIO__ Delete I/O port as valid. Equivalent to ioperm(arg,1,0). __KDENABIO__ Enable I/O to video board. Equivalent to ioperm(0x3b4, 0x3df-0x3b4+1, 1). __KDDISABIO__ Disable I/O to video board. Equivalent to ioperm(0x3b4, 0x3df-0x3b4+1, 0). __KDSETMODE__ Set text/graphics mode. ''argp'' is one of these: KD_TEXT 0x00 KD_GRAPHICS 0x01 __KDGETMODE__ Get text/graphics mode. ''argp'' points to a long which is set to one of the above values. __KDMKTONE__ Generate tone of specified length. The lower 16 bits of ''argp'' specify the period in clock cycles, and the upper 16 bits give the duration in msec. If the duration is zero, the sound is turned off. Control returns immediately. For example, ''argp'' = (125 '' __KIOCSOUND__ Start or stop sound generation. The lower 16 bits of ''argp'' specify the period in clock cycles (that is, ''argp'' = 1193180/frequency). ''argp'' = 0 turns sound off. In either case, control returns immediately. __GIO_FONT__ Gets screen font in expanded form. ''argp'' points to an 8192 byte array. __PIO_FONT__ Sets screen font. Load font into the EGA/VGA character generator. ''argp'' points to a 8192 byte map, with 32 bytes per character. Only first ''N'' of them are used for an 8x''N'' font (0 ''N'' '' __GIO_SCRNMAP__ Get screen mapping from kernel. ''argp'' points to an area of size E_TABSZ. __PIO_SCRNMAP__ Loads the argp'' points to an area of size E_TABSZ. __GIO_UNIMAP__ Get unicode-to-font mapping from kernel. ''argp'' points to a struct unimapdesc { u_short ''entry_ct''; struct unipair *''entries''; }; where ''entries'' points to an array of struct unipair { u_short ''unicode''; u_short ''fontpos''; }; (Since 1.1.92.) __PIO_UNIMAP__ Put unicode-to-font mapping in kernel. ''argp'' points to a struct unimapdesc. (Since 1.1.92) __PIO_UNIMAPCLR__ Clear table, possibly advise hash algorithm. ''argp'' points to a struct unimapinit { u_short ''advised_hashsize''; /* 0 if no opinion */ u_short ''advised_hashstep''; /* 0 if no opinion */ u_short ''advised_hashlevel''; /* 0 if no opinion */ }; (Since 1.1.92.) __KDGKBMODE__ Gets current keyboard mode. ''argp'' points to a long which is set to one of these: K_RAW 0x00 K_XLATE 0x01 K_MEDIUMRAW 0x02 K_UNICODE 0x03 __KDSKBMODE__ Sets current keyboard mode. ''argp'' is a long equal to one of the above values. __KDGKBMETA__ Gets meta key handling mode. ''argp'' points to a long which is set to one of these: K_METABIT 0x03 set high order bit K_ESCPREFIX 0x04 escape prefix __KDSKBMETA__ Sets meta key handling mode. ''argp'' is a long equal to one of the above values. __KDGKBENT__ Gets one entry in key translation table (keycode to action code). ''argp'' points to a struct kbentry { u_char ''kb_table''; u_char ''kb_index''; u_short ''kb_value''; }; with the first two members filled in: ''kb_table'' selects the key table (0 ''kb_table'' ''kb_index'' is the keycode (0 ''kb_index'' ''kb_value'' is set to the corresponding action code, or K_HOLE if there is no such key, or K_NOSUCHMAP if ''kb_table'' is invalid. __KDSKBENT__ Sets one entry in translation table. ''argp'' points to a struct kbentry. __KDGKBSENT__ Gets one function key string. ''argp'' points to a struct kbsentry { u_char ''kb_func''; u_char ''kb_string''[[512]; }; ''kb_string'' is set to the (NULL terminated) string corresponding to the ''kb_func''th function key action code. __KDSKBSENT__ Sets one function key string entry. ''argp'' points to a struct kbsentry. __KDGKBDIACR__ Read kernel accent table. ''argp'' points to a struct kbdiacrs { unsigned int ''kb_cnt''; struct kbdiacr ''kbdiacr''[[256]; }; where ''kb_cnt'' is the number of entries in the array, each of which is a struct kbdiacr { u_char ''diacr'', ''base'', ''result''; }; __KDGETKEYCODE__ Read kernel keycode table entry (scan code to keycode). ''argp'' points to a struct kbkeycode { unsigned int ''scancode'', ''keycode''; }; ''keycode'' is set to correspond to the given ''scancode''. (89 ''scancode'' ''scancode'' ''keycode''==''scancode''.) (Since 1.1.63.) __KDSETKEYCODE__ Write kernel keycode table entry. ''argp'' points to struct kbkeycode. (Since 1.1.63.) __KDSIGACCEPT__ The calling process indicates its willingness to accept the signal ''argp'' when it is generated by pressing an appropriate key combination. (1 ''argp'' '' __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'' '' __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 req */ short ''acqsig''; /* signal to raise on acquisition */ short ''frsig''; /* unused (set to 0) */ }; ''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 { ushort ''v_active''; /* active vt */ ushort ''v_signal''; /* signal to send */ ushort ''v_state''; /* vt bitmask */ }; For each vt in use, the corresponding bit in the ''v_state'' member is set. (Kernels 1.0 through 1.1.92.) __VT_RELDISP__ Release a display. __VT_ACTIVATE__ Switch to vt ''argp'' (1 ''argp'' '' __VT_WAITACTIVE__ Wait until vt ''argp'' has been activated. __VT_DISALLOCATE__ Deallocate the memory associated with vt ''argp''. (Since 1.1.54.) __VT_RESIZE__ Set kernel's idea of screensize. ''argp'' points to a struct vt_sizes { ushort ''v_rows''; /* # rows */ ushort ''v_cols''; /* # columns */ ushort ''v_scrollsize''; /* no longer used */ }; (Since 1.1.54.) Note that this does not change the videomode. See resizecons(8). 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 tty. __TIOCLINUX, subcode=0__ Dump the screen. Disappeared in 1.1.92. (With kernel 1.1.92 or later, read from /dev/vcsN or /dev/vcsaN instead.) __TIOCLINUX, subcode=1__ Get task information. Disappeared in 1.1.92. __TIOCLINUX, subcode=2__ 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 the static array sel_buffer in devices/char/console.c. __TIOCLINUX, subcode=3__ Paste selection. The characters in the selection buffer are written to ''fd''. __TIOCLINUX, subcode=4__ Unblank the screen. __TIOCLINUX, subcode=5__ Sets contents of a 256-bit look up table defining characters in a __TIOCLINUX, subcode=6__ ''argp'' points to a char which is set to the value of the kernel variable ''shift_state''. (Since 1.1.32.) __TIOCLINUX, subcode=7__ ''argp'' points to a char which is set to the value of the kernel variable ''report_mouse''. (Since 1.1.33.) __TIOCLINUX, subcode=8__ Dump screen width and height, cursor position, and all the character-attribute pairs. (Kernels 1.1.67 through 1.1.91 only. With kernel 1.1.92 or later, read from /dev/vcsa* instead.) __TIOCLINUX, subcode=9__ Restore screen width and height, cursor position, and all the character-attribute pairs. (Kernels 1.1.67 through 1.1.91 only. With kernel 1.1.92 or later, write to /dev/vcsa* instead.) __TIOCLINUX, subcode=10__ Handles the Power Saving feature of the new generation of monitors. VESA screen blanking mode is set to ''argp'', which is one of: ''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 '' ''2'': The current settings are saved, then both the vertical and horizontal synchronization pulses are turned off. This puts the monitor into ''Caution:'' Powering down frequently will damage the monitor.) (Since 1.1.76.) !!RETURN VALUES -1 for error, and ''errno'' is set. !!ERRORS ''errno'' may take on these values: EBADF file descriptor is invalid. ENOTTY file descriptor is not associated with a character special device, or the specified request does not apply to it. EINVAL file descriptor or ''argp'' is invalid. EPERM permission violation. !!WARNING Do not regard this man page as documentation of the Linux console ioctl's. 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, ioctl's are introduced for communication between the kernel and one particular well-known program (fdisk(8), hdparm(8), setserial(8), tunelp(8), loadkeys(1), gpm(8), consolechars(8), etc.), and their behavior will be changed when required by these particular programs. Programs using these ioctl's 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. !!SEE ALSO kbd_mode(1), loadkeys(1), dumpkeys(1), mknod(1), setleds(1), setmetamode(1), ioperm(2), termios(2), execve(2), fcntl(2), mt(4), sd(4), tty(4), ttys(4), vcs(4), vcsa(4), mapscrn(8), consolechars(8), resizecons(8), ''/usr/include/linux/kd.h'', ''/usr/include/linux/vt.h''. ----
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