On Wed, Oct 04, 2023 at 06:19:30PM +0000, Fred vS wrote: > Hello. Hi,
> > > I try to make work the "Keyboard event" step from the Wayland-book but the C > demo crash at loading. > > The problem comes from the mapping: with that error: > > > Line 301: wl_keyboard_keymap: Assertion map_shm != MAP_FAILED' failed. > > > Here is the function: > > static void > wl_keyboard_keymap(void *data, struct wl_keyboard *wl_keyboard, > uint32_t format, int32_t fd, uint32_t size) > { > struct client_state *client_state = data; > assert(format == WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1); > > // Line 301: Here problem with mapping > char *map_shm = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0); We can read in the documentation of this protocol: https://wayland.app/protocols/wayland#wl_keyboard:event:keymap “From version 7 onwards, the fd must be mapped with MAP_PRIVATE by the recipient, as MAP_SHARED may fail.” I don’t know which wl_shell version you are using, but check that maybe. > assert(map_shm != MAP_FAILED); > > struct xkb_keymap *xkb_keymap = xkb_keymap_new_from_string( > client_state->xkb_context, map_shm, > XKB_KEYMAP_FORMAT_TEXT_V1, XKB_KEYMAP_COMPILE_NO_FLAGS); > munmap(map_shm, size); > close(fd); > > struct xkb_state *xkb_state = xkb_state_new(xkb_keymap); > xkb_keymap_unref(client_state->xkb_keymap); > xkb_state_unref(client_state->xkb_state); > client_state->xkb_keymap = xkb_keymap; > client_state->xkb_state = xkb_state; > } > > > > Why does the mapping fails, I did check fd and size and they are correctly > assigned? > > > Thanks. > -- Link Mauve