HelenOS sources
KC_U 350 uspace/app/fontedit/fontedit.c case KC_U:
KC_U 75 uspace/drv/hid/adb-kbd/ctl.c [0x20] = KC_U,
KC_U 81 uspace/drv/hid/atkbd/atkbd.c [0x3c] = KC_U,
KC_U 67 uspace/drv/hid/usbhid/kbd/conv.c [0x18] = KC_U,
KC_U 73 uspace/drv/hid/xtkbd/xtkbd.c [0x16] = KC_U,
KC_U 470 uspace/lib/vt/src/vt100.c vt100_key(vt, KM_ALT, KC_U, c);
KC_U 1155 uspace/lib/vt/src/vt100.c vt100_key(vt, 0, KC_U, c);
KC_U 1307 uspace/lib/vt/src/vt100.c vt100_key(vt, KM_SHIFT, KC_U, c);
KC_U 1431 uspace/lib/vt/src/vt100.c vt100_key(vt, KM_CTRL, KC_U, c);
KC_U 102 uspace/srv/hid/input/ctl/stty.c 0, KC_U, 0x75, GSP_END,
KC_U 160 uspace/srv/hid/input/ctl/stty.c KM_SHIFT, KC_U, 0x55, GSP_END,
KC_U 238 uspace/srv/hid/input/ctl/stty.c KM_CTRL, KC_U, 0x15, GSP_END,
KC_U 281 uspace/srv/hid/input/ctl/stty.c KM_ALT, KC_U, 0x1b, 0x75, GSP_END,
KC_U 158 uspace/srv/hid/input/ctl/sun.c [0x3c] = KC_U,
KC_U 88 uspace/srv/hid/input/layout/ar.c [KC_U] = L'ع',
KC_U 146 uspace/srv/hid/input/layout/ar.c [KC_U] = L'`',
KC_U 72 uspace/srv/hid/input/layout/cz.c [KC_U] = 'u',
KC_U 103 uspace/srv/hid/input/layout/cz.c [KC_U] = 'U',
KC_U 232 uspace/srv/hid/input/layout/cz.c [KC_U] = L'ů',
KC_U 246 uspace/srv/hid/input/layout/cz.c [KC_U] = L'Ů',
KC_U 257 uspace/srv/hid/input/layout/cz.c [KC_U] = L'ú',
KC_U 268 uspace/srv/hid/input/layout/cz.c [KC_U] = L'Ú',
KC_U 60 uspace/srv/hid/input/layout/fr_azerty.c [KC_U] = 'u',
KC_U 91 uspace/srv/hid/input/layout/fr_azerty.c [KC_U] = 'U',
KC_U 57 uspace/srv/hid/input/layout/us_dvorak.c [KC_U] = 'g',
KC_U 90 uspace/srv/hid/input/layout/us_dvorak.c [KC_U] = 'G',
KC_U 60 uspace/srv/hid/input/layout/us_qwerty.c [KC_U] = 'u',
KC_U 91 uspace/srv/hid/input/layout/us_qwerty.c [KC_U] = 'U',
HelenOS homepage, sources at GitHub