KEYBOARD(2)                                           KEYBOARD(2)

          initkeyboard, ctlkeyboard, closekeyboard - keyboard control

          #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)

          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 Keyboardctl structure:

               typedef struct Keyboardctl 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 device.

          Ctlkeyboard is used to set the state of the interface, typi-
          cally 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.

     Page 1                       Plan 9             (printed 4/13/24)

     KEYBOARD(2)                                           KEYBOARD(2)

          Closekeyboard closes the file descriptors associated with
          the keyboard, kills the slave processes, and frees the
          Keyboardctl structure.


          graphics(2), draw(2), event(2), thread(2).

          Because the interface delivers complete runes, there is no
          way to report lesser actions such as shift keys or even
          individual bytes.

     Page 2                       Plan 9             (printed 4/13/24)