Keyboard sim via userspace comp

component uinput "This component inserts keys presses"; pin io unsigned keyclick "Send down & up event"; pin io unsigned keydown "Send key down (pressed) event"; pin io unsigned keyup "Send key up (released) event"; option extra_setup yes; option extra_cleanup yes; option singleton yes; // makes no sense to have more than one of these components running option userspace yes; option extra_link_args "-L/usr/lib/x86_64-linux-gnu -levdev"; //link in libevdev change path for 32 bit // Requires installing libevdev-dev & libevdev2 packages // When building under debian a symlink /usr/include/libevdev -> /usr/include/libevdev-1.0/libevdev // needs to be created when libevdev-dev is installed // Build with sudo halcompile --install --userspace uinput.comp // If group uinput does not exist create it // Add your user to group uinput // /dev/uinput requires group ownership changing to uinput // Usage: open a terminal run halrun at halcmd prompt loadusr -W uinput // Open a second terminal and run: // halcmd setp uinput.keyclick 33 // this will output a lowercase f // halcmd setp uinput.keydown 42 && halcmd setp uinput.keyclick 33 && halcmd setp uinput.keyup 42 // will output a uppercase F // Key codes are defined in /usr/include/linux/input-event-codes.h author "AnnoyingMutt robertDOTmurphyATgmxDOTcom"; license "GPL"; ;; #include <stdio.h> #include <libevdev/libevdev.h> #include <libevdev/libevdev-uinput.h> #include <unistd.h> int enable_event_code_range( int min, int max); struct libevdev *dev; struct libevdev_uinput *uidev; EXTRA_SETUP() { int err; dev = libevdev_new(); libevdev_set_name(dev, "fake keyboard device"); // We will only emulate key presses libevdev_enable_event_type(dev, EV_KEY); // Enable the keys ESC to Dot on Numeric keypad enable_event_code_range( KEY_ESC, KEY_KPDOT); err = libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev); if (err != 0) { perror("init_uinput: Couldn't create device\n"); return(-1); } usleep(100000); //wait for device to be grabbed by X return(0); } EXTRA_CLEANUP() { libevdev_uinput_destroy(uidev); } void user_mainloop(void) { while ( 1 ) { FOR_ALL_INSTS() { // Only accept valid event (key) codes if ( keyclick >= KEY_ESC && keyclick <= KEY_KPDOT) { libevdev_uinput_write_event(uidev, EV_KEY, keyclick, 1); libevdev_uinput_write_event(uidev, EV_SYN, SYN_REPORT, 0); libevdev_uinput_write_event(uidev, EV_KEY, keyclick, 0); libevdev_uinput_write_event(uidev, EV_SYN, SYN_REPORT, 0); keyclick = 0; } // Only accept valid event (key) codes if ( keydown >= KEY_ESC && keydown <= KEY_KPDOT) { libevdev_uinput_write_event(uidev, EV_KEY, keydown, 1); libevdev_uinput_write_event(uidev, EV_SYN, SYN_REPORT, 0); keydown = 0; } // Only accept valid event (key) codes if ( keyup >= KEY_ESC && keyup <= KEY_KPDOT) { libevdev_uinput_write_event(uidev, EV_KEY, keyup, 0); libevdev_uinput_write_event(uidev, EV_SYN, SYN_REPORT, 0); keyup = 0; } } } exit(0); } int enable_event_code_range( int min, int max) { int event_code; for ( event_code = min; event_code <= max; event_code ++) libevdev_enable_event_code(dev, EV_KEY, event_code, NULL); return(0); }