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Code Issues
bemenu/lib/renderers/wayland/wayland.c
Joan Bruguera 8217ae024b Fix exiting when an unexpected Wayland error occurs. 
If an unexpected error was returned from a Wayland API during rendering (e.g.
from wl_display_flush), the code did set input.sym = XKB_KEY_Escape, so that
the next call to poll_key would return BM_KEY_ESCAPE and bemenu would quit.

However, this has been broken since #135, because input.key_pending was not
set, so the "fake" XKB_KEY_Escape is just ignored, bemenu doesn't quit, but
instead, it enters an infinite loop and keeps a CPU core at 100% usage.

The "quick fix" would be to just set input.key_pending wherever input.sym was
set to XKB_KEY_Escape. However, to make error handling less error-prone,
decouple it from input handling and add an error flag to (bm_menu_)render.
2022-08-03 08:55:34 +09:00

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#include "internal.h"
#include "wayland.h"
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
static int efd;
static void
render_windows_if_pending(const struct bm_menu *menu, struct wayland *wayland) {
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
if (window->render_pending)
bm_wl_window_render(window, wayland->display, menu);
}
wl_display_flush(wayland->display);
}
static bool
wait_for_events(struct wayland *wayland) {
wl_display_dispatch_pending(wayland->display);
if (wl_display_flush(wayland->display) < 0 && errno != EAGAIN)
return false;
struct epoll_event ep[16];
uint32_t num = epoll_wait(efd, ep, 16, -1);
for (uint32_t i = 0; i < num; ++i) {
if (ep[i].data.ptr == &wayland->fds.display) {
if (ep[i].events & EPOLLERR || ep[i].events & EPOLLHUP ||
((ep[i].events & EPOLLIN) && wl_display_dispatch(wayland->display) < 0))
return false;
} else if (ep[i].data.ptr == &wayland->fds.repeat) {
bm_wl_repeat(wayland);
}
}
return true;
}
static void
schedule_windows_render_if_dirty(struct bm_menu *menu, struct wayland *wayland) {
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
if (window->render_pending) {
// This does not happen during normal execution, but only when the windows need to
// be(re)created. We need to do the render ASAP (not schedule it) because otherwise,
// since we lack a window, we may not receive further events and will get deadlocked
render_windows_if_pending(menu, wayland);
} else if (menu->dirty) {
bm_wl_window_schedule_render(window);
}
}
menu->dirty = false;
}
static bool
render(struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
schedule_windows_render_if_dirty(menu, wayland);
if (!wait_for_events(wayland))
return false;
render_windows_if_pending(menu, wayland);
return true;
}
static enum bm_key
poll_key(const struct bm_menu *menu, unsigned int *unicode)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland && unicode);
*unicode = 0;
if (wayland->input.sym == XKB_KEY_NoSymbol)
return BM_KEY_NONE;
xkb_keysym_t sym = wayland->input.sym;
uint32_t mods = wayland->input.modifiers;
*unicode = xkb_state_key_get_utf32(wayland->input.xkb.state, wayland->input.code);
if (!*unicode && wayland->input.code == 23 && (mods & MOD_SHIFT))
return BM_KEY_SHIFT_TAB;
wayland->input.sym = XKB_KEY_NoSymbol;
wayland->input.code = 0;
if (!wayland->input.key_pending)
return BM_KEY_UNICODE;
wayland->input.key_pending = false;
switch (sym) {
case XKB_KEY_Up:
return BM_KEY_UP;
case XKB_KEY_Down:
return BM_KEY_DOWN;
case XKB_KEY_Left:
return (mods & MOD_SHIFT ? BM_KEY_UP : BM_KEY_LEFT);
case XKB_KEY_Right:
return (mods & MOD_SHIFT ? BM_KEY_DOWN : BM_KEY_RIGHT);
case XKB_KEY_Home:
return BM_KEY_HOME;
case XKB_KEY_End:
return BM_KEY_END;
case XKB_KEY_SunPageUp:
return (mods & MOD_SHIFT ? BM_KEY_SHIFT_PAGE_UP : BM_KEY_PAGE_UP);
case XKB_KEY_less:
return (mods & MOD_ALT ? BM_KEY_SHIFT_PAGE_UP : BM_KEY_UNICODE);
case XKB_KEY_SunPageDown:
return (mods & MOD_SHIFT ? BM_KEY_SHIFT_PAGE_DOWN : BM_KEY_PAGE_DOWN);
case XKB_KEY_greater:
return (mods & MOD_ALT ? BM_KEY_SHIFT_PAGE_DOWN : BM_KEY_UNICODE);
case XKB_KEY_v:
return (mods & MOD_CTRL ? BM_KEY_PAGE_DOWN : (mods & MOD_ALT ? BM_KEY_PAGE_UP : BM_KEY_UNICODE));
case XKB_KEY_BackSpace:
return BM_KEY_BACKSPACE;
case XKB_KEY_Delete:
return (mods & MOD_SHIFT ? BM_KEY_LINE_DELETE_LEFT : BM_KEY_DELETE);
case XKB_KEY_Tab:
return (mods & MOD_SHIFT ? BM_KEY_SHIFT_TAB : BM_KEY_TAB);
case XKB_KEY_Insert:
return BM_KEY_SHIFT_RETURN;
case XKB_KEY_KP_Enter:
case XKB_KEY_Return:
return (mods & MOD_CTRL ? BM_KEY_CONTROL_RETURN : (mods & MOD_SHIFT ? BM_KEY_SHIFT_RETURN : BM_KEY_RETURN));
case XKB_KEY_g:
if (!(mods & MOD_CTRL)) return BM_KEY_UNICODE;
// fall through
case XKB_KEY_c:
if (!(mods & MOD_CTRL)) return BM_KEY_UNICODE;
// fall through
case XKB_KEY_bracketleft:
if (!(mods & MOD_CTRL)) return BM_KEY_UNICODE;
// fall through
case XKB_KEY_Escape:
return BM_KEY_ESCAPE;
case XKB_KEY_p:
return (mods & MOD_CTRL ? BM_KEY_UP : BM_KEY_UNICODE);
case XKB_KEY_n:
return (mods & MOD_CTRL ? BM_KEY_DOWN : BM_KEY_UNICODE);
case XKB_KEY_l:
return (mods & MOD_CTRL ? BM_KEY_LEFT : (mods & MOD_ALT ? BM_KEY_DOWN : BM_KEY_UNICODE));
case XKB_KEY_f:
return (mods & MOD_CTRL ? BM_KEY_RIGHT : BM_KEY_UNICODE);
case XKB_KEY_a:
return (mods & MOD_CTRL ? BM_KEY_HOME : BM_KEY_UNICODE);
case XKB_KEY_e:
return (mods & MOD_CTRL ? BM_KEY_END : BM_KEY_UNICODE);
case XKB_KEY_h:
return (mods & MOD_CTRL ? BM_KEY_BACKSPACE : (mods & MOD_ALT ? BM_KEY_UP : BM_KEY_UNICODE));
case XKB_KEY_u:
return (mods & MOD_CTRL ? BM_KEY_LINE_DELETE_LEFT : (mods & MOD_ALT ? BM_KEY_PAGE_UP : BM_KEY_UNICODE));
case XKB_KEY_k:
return (mods & MOD_CTRL ? BM_KEY_LINE_DELETE_RIGHT : (mods & MOD_ALT ? BM_KEY_UP : BM_KEY_UNICODE));
case XKB_KEY_w:
return (mods & MOD_CTRL ? BM_KEY_WORD_DELETE : BM_KEY_UNICODE);
case XKB_KEY_j:
return (mods & MOD_ALT ? BM_KEY_DOWN : BM_KEY_UNICODE);
case XKB_KEY_d:
return (mods & MOD_ALT ? BM_KEY_PAGE_DOWN : BM_KEY_UNICODE);
case XKB_KEY_m:
return (mods & MOD_CTRL ? BM_KEY_RETURN : BM_KEY_UNICODE);
case XKB_KEY_y:
return (mods & MOD_CTRL ? BM_KEY_PASTE : BM_KEY_UNICODE);
case XKB_KEY_1:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_1;
break;
case XKB_KEY_2:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_2;
break;
case XKB_KEY_3:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_3;
break;
case XKB_KEY_4:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_4;
break;
case XKB_KEY_5:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_5;
break;
case XKB_KEY_6:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_6;
break;
case XKB_KEY_7:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_7;
break;
case XKB_KEY_8:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_8;
break;
case XKB_KEY_9:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_9;
break;
case XKB_KEY_0:
if ((mods & MOD_ALT)) return BM_KEY_CUSTOM_10;
break;
default: break;
}
return BM_KEY_UNICODE;
}
struct bm_pointer
poll_pointer(const struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
struct input *input = &wayland->input;
struct pointer_event *event = &input->pointer_event;
assert(wayland && event);
struct bm_pointer bm_pointer;
bm_pointer.event_mask = event->event_mask;
bm_pointer.pos_x = wl_fixed_to_int(event->surface_x);
bm_pointer.pos_y = wl_fixed_to_int(event->surface_y);
bm_pointer.time = event->time;
bm_pointer.axes[0].valid = event->axes[0].valid;
bm_pointer.axes[0].value = event->axes[0].value;
bm_pointer.axes[0].discrete = event->axes[0].discrete;
bm_pointer.axes[1].valid = event->axes[1].valid;
bm_pointer.axes[1].value = event->axes[1].value;
bm_pointer.axes[1].discrete = event->axes[1].discrete;
bm_pointer.axis_source = event->axis_source;
bm_pointer.button = BM_POINTER_KEY_NONE;
switch (event->button) {
case BTN_LEFT:
bm_pointer.button = BM_POINTER_KEY_PRIMARY;
break;
}
if (event->state & WL_POINTER_BUTTON_STATE_PRESSED) {
bm_pointer.state |= POINTER_STATE_PRESSED;
}
if (event->state & WL_POINTER_BUTTON_STATE_RELEASED) {
bm_pointer.state |= POINTER_STATE_RELEASED;
}
memset(event, 0, sizeof(*event));
return bm_pointer;
}
struct bm_touch
poll_touch(const struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
struct input *input = &wayland->input;
struct touch_event *event = &input->touch_event;
assert(wayland && event);
struct bm_touch bm_touch;
for (size_t i = 0; i < 2; ++i) {
struct touch_point *point = &event->points[i];
if (!point->valid) {
bm_touch.points[i].event_mask = 0;
continue;
}
bm_touch.points[i].event_mask = point->event_mask;
bm_touch.points[i].pos_x = wl_fixed_to_int(point->surface_x);
bm_touch.points[i].pos_y = wl_fixed_to_int(point->surface_y);
bm_touch.points[i].start_x = wl_fixed_to_int(point->surface_start_x);
bm_touch.points[i].start_y = wl_fixed_to_int(point->surface_start_y);
bm_touch.points[i].major = point->major;
bm_touch.points[i].minor = point->minor;
bm_touch.points[i].orientation = point->orientation;
if (point->event_mask & TOUCH_EVENT_UP) {
point->valid = false;
point->event_mask = 0;
}
}
return bm_touch;
}
void
release_touch(const struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
struct input *input = &wayland->input;
struct touch_event *event = &input->touch_event;
assert(wayland && event);
for (size_t i = 0; i < 2; ++i) {
struct touch_point *point = &event->points[i];
point->valid = false;
}
}
static uint32_t
get_displayed_count(const struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
uint32_t max = 0;
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
if (window->displayed > max)
max = window->displayed;
}
return max;
}
static uint32_t
get_height(const struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
uint32_t max = 0;
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
if (window->displayed > max)
max = window->height;
}
return max;
}
static uint32_t
get_width(const struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
uint32_t max = 0;
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
if (window->displayed > max)
max = window->width;
}
return max;
}
static void
set_width(const struct bm_menu *menu, uint32_t margin, float factor)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
bm_wl_window_set_width(window, wayland->display, margin, factor);
}
}
static void
set_align(const struct bm_menu *menu, enum bm_align align)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
bm_wl_window_set_align(window, wayland->display, align);
}
}
static void
grab_keyboard(const struct bm_menu *menu, bool grab)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
bm_wl_window_grab_keyboard(window, wayland->display, grab);
}
}
static void
set_overlap(const struct bm_menu *menu, bool overlap)
{
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
bm_wl_window_set_overlap(window, wayland->display, overlap);
}
}
static void
destroy_windows(struct wayland *wayland)
{
struct window *window;
wl_list_for_each(window, &wayland->windows, link) {
bm_wl_window_destroy(window);
}
wl_list_init(&wayland->windows);
}
static void
recreate_windows(const struct bm_menu *menu, struct wayland *wayland)
{
destroy_windows(wayland);
int32_t monitors = 0;
struct output *output;
wl_list_for_each(output, &wayland->outputs, link)
monitors++;
int32_t monitor = 0;
wl_list_for_each(output, &wayland->outputs, link) {
if (!menu->monitor_name) {
if (menu->monitor > -1) {
if (menu->monitor < monitors && monitor != menu->monitor) {
++monitor;
continue;
}
}
} else if (strcmp(menu->monitor_name, output->name)) {
continue;
}
struct wl_surface *surface;
if (!(surface = wl_compositor_create_surface(wayland->compositor)))
goto fail;
wl_surface_set_buffer_scale(surface, output->scale);
struct window *window = calloc(1, sizeof(struct window));
window->align = menu->align;
window->hmargin_size = menu->hmargin_size;
window->width_factor = menu->width_factor;
const char *scale = getenv("BEMENU_SCALE");
if (scale) {
window->scale = fmax(strtof(scale, NULL), 1.0f);
} else {
window->scale = output->scale;
}
if (!bm_wl_window_create(window, wayland->display, wayland->shm, (menu->monitor == -1) ? NULL : output->output, wayland->layer_shell, surface))
free(window);
window->notify.render = bm_cairo_paint;
window->max_height = output->height;
window->render_pending = true;
wl_list_insert(&wayland->windows, &window->link);
if (menu->monitor != -2) break;
}
set_overlap(menu, menu->overlap);
grab_keyboard(menu, menu->grabbed);
return;
fail:
// This is non handlable if fails on recreation
fprintf(stderr, "wayland window creation failed :/\n");
abort();
}
static void
set_monitor(const struct bm_menu *menu, int32_t monitor)
{
(void)monitor;
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
recreate_windows(menu, wayland);
}
static void
set_monitor_name(const struct bm_menu *menu, char *monitor_name)
{
(void)monitor_name;
struct wayland *wayland = menu->renderer->internal;
assert(wayland);
recreate_windows(menu, wayland);
}
static void
destructor(struct bm_menu *menu)
{
struct wayland *wayland = menu->renderer->internal;
if (!wayland)
return;
destroy_windows(wayland);
bm_wl_registry_destroy(wayland);
xkb_context_unref(wayland->input.xkb.context);
if (wayland->display) {
epoll_ctl(efd, EPOLL_CTL_DEL, wayland->fds.repeat, NULL);
epoll_ctl(efd, EPOLL_CTL_DEL, wayland->fds.display, NULL);
close(wayland->fds.repeat);
wl_display_flush(wayland->display);
wl_display_disconnect(wayland->display);
}
free(wayland);
menu->renderer->internal = NULL;
}
static bool
constructor(struct bm_menu *menu)
{
if (!getenv("WAYLAND_DISPLAY") && !getenv("WAYLAND_SOCKET"))
return false;
struct wayland *wayland;
if (!(menu->renderer->internal = wayland = calloc(1, sizeof(struct wayland))))
goto fail;
wl_list_init(&wayland->windows);
wl_list_init(&wayland->outputs);
if (!(wayland->display = wl_display_connect(NULL)))
goto fail;
if (!(wayland->input.xkb.context = xkb_context_new(XKB_CONTEXT_NO_FLAGS)))
goto fail;
if (!bm_wl_registry_register(wayland))
goto fail;
wayland->fds.display = wl_display_get_fd(wayland->display);
wayland->fds.repeat = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
wayland->input.repeat_fd = &wayland->fds.repeat;
wayland->input.key_pending = false;
recreate_windows(menu, wayland);
if (!efd && (efd = epoll_create1(EPOLL_CLOEXEC)) < 0)
goto fail;
struct epoll_event ep;
ep.events = EPOLLIN | EPOLLERR | EPOLLHUP;
ep.data.ptr = &wayland->fds.display;
epoll_ctl(efd, EPOLL_CTL_ADD, wayland->fds.display, &ep);
struct epoll_event ep2;
ep2.events = EPOLLIN;
ep2.data.ptr = &wayland->fds.repeat;
epoll_ctl(efd, EPOLL_CTL_ADD, wayland->fds.repeat, &ep2);
return true;
fail:
destructor(menu);
return false;
}
BM_PUBLIC extern const char*
register_renderer(struct render_api *api)
{
api->constructor = constructor;
api->destructor = destructor;
api->get_displayed_count = get_displayed_count;
api->get_height = get_height;
api->get_width = get_width;
api->poll_key = poll_key;
api->poll_pointer = poll_pointer;
api->poll_touch = poll_touch;
api->release_touch = release_touch;
api->render = render;
api->set_align = set_align;
api->set_width = set_width;
api->grab_keyboard = grab_keyboard;
api->set_overlap = set_overlap;
api->set_monitor = set_monitor;
api->set_monitor_name = set_monitor_name;
api->priorty = BM_PRIO_GUI;
api->version = BM_PLUGIN_VERSION;
return "wayland";
}
/* vim: set ts=8 sw=4 tw=0 :*/
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