term% cat index.txt KEYBOARD(2) System Calls Manual KEYBOARD(2)
NAME
initkeyboard, ctlkeyboard, closekeyboard - keyboard control
SYNOPSIS
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <keyboard.h>
Keyboardctl *initkeyboard(char *file)
int ctlkeyboard(Keyboardctl *kc, char *msg)
void closekeyboard(Keyboard *kc)
DESCRIPTION
These functions access and control a keyboard interface for character-
at-a-time I/O in a multi-threaded environment, usually in combination
with mouse(2). They use the message-passing Channel interface in the
threads library (see thread(2)); programs that wish a more event-
driven, single-threaded approach should use event(2).
Initkeyboard opens a connection to the keyboard and returns a Keyboard‐
ctl structure:
typedef struct Keyboardct Keyboardctl;
struct Keyboardctl
{
Channel *c; /* chan(Rune[20]) */
char *file;
int consfd; /* to cons file */
int ctlfd; /* to ctl file */
int pid; /* of slave proc */
};
The argument to initkeyboard is a file naming the device file from
which characters may be read, typically /dev/cons. If file is nil,
/dev/cons is assumed.
Once the Keyboardctl is set up a message containing a Rune will be sent
on the Channel Keyboardctl.c to report each character read from the de‐
vice.
Ctlkeyboard is used to set the state of the interface, typically to
turn raw mode on and off (see cons(3)). It writes the string msg to
the control file associated with the device, which is assumed to be the
regular device file name with the string ctl appended.
Closekeyboard closes the file descriptors associated with the keyboard,
kills the slave processes, and frees the Keyboardctl structure.
SOURCE
/sys/src/libdraw
SEE ALSO
graphics(2), draw(2), event(2), thread(2).
BUGS
Because the interface delivers complete runes, there is no way to re‐
port lesser actions such as shift keys or even individual bytes.
KEYBOARD(2)