wlroots/xwayland/xwayland.c

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C
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#define _POSIX_C_SOURCE 200809L
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#include <errno.h>
#include <fcntl.h>
#include <signal.h>
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#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <sys/socket.h>
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#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
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#include <unistd.h>
#include <wayland-server-core.h>
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#include <wlr/util/log.h>
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#include <wlr/xwayland.h>
#include "sockets.h"
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#include "util/signal.h"
#include "xwayland/xwm.h"
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struct wlr_xwayland_cursor {
uint8_t *pixels;
uint32_t stride;
uint32_t width;
uint32_t height;
int32_t hotspot_x;
int32_t hotspot_y;
};
static void safe_close(int fd) {
if (fd >= 0) {
close(fd);
}
}
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static int fill_arg(char ***argv, const char *fmt, ...) {
int len;
char **cur_arg = *argv;
va_list args;
va_start(args, fmt);
len = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
while (*cur_arg) {
cur_arg++;
}
*cur_arg = malloc(len);
if (!*cur_arg) {
return -1;
}
*argv = cur_arg;
va_start(args, fmt);
len = vsnprintf(*cur_arg, len, fmt, args);
va_end(args);
return len;
}
_Noreturn static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
if (!set_cloexec(wlr_xwayland->x_fd[0], false) ||
!set_cloexec(wlr_xwayland->x_fd[1], false) ||
!set_cloexec(wlr_xwayland->wm_fd[1], false) ||
!set_cloexec(wlr_xwayland->wl_fd[1], false)) {
_exit(EXIT_FAILURE);
}
/* Make Xwayland signal us when it's ready */
signal(SIGUSR1, SIG_IGN);
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char *argv[] = {
"Xwayland", NULL /* display, e.g. :1 */,
"-rootless", "-terminate",
"-listen", NULL /* x_fd[0] */,
"-listen", NULL /* x_fd[1] */,
"-wm", NULL /* wm_fd[1] */,
NULL,
};
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char **cur_arg = argv;
if (fill_arg(&cur_arg, ":%d", wlr_xwayland->display) < 0 ||
fill_arg(&cur_arg, "%d", wlr_xwayland->x_fd[0]) < 0 ||
fill_arg(&cur_arg, "%d", wlr_xwayland->x_fd[1]) < 0 ||
fill_arg(&cur_arg, "%d", wlr_xwayland->wm_fd[1]) < 0) {
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wlr_log_errno(WLR_ERROR, "alloc/print failure");
_exit(EXIT_FAILURE);
}
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char wayland_socket_str[16];
snprintf(wayland_socket_str, sizeof(wayland_socket_str), "%d", wlr_xwayland->wl_fd[1]);
setenv("WAYLAND_SOCKET", wayland_socket_str, true);
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wlr_log(WLR_INFO, "WAYLAND_SOCKET=%d Xwayland :%d -rootless -terminate -listen %d -listen %d -wm %d",
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wlr_xwayland->wl_fd[1], wlr_xwayland->display, wlr_xwayland->x_fd[0],
wlr_xwayland->x_fd[1], wlr_xwayland->wm_fd[1]);
// Closes stdout/stderr depending on log verbosity
enum wlr_log_importance verbosity = wlr_log_get_verbosity();
int devnull = open("/dev/null", O_WRONLY | O_CREAT | O_CLOEXEC, 0666);
if (devnull < 0) {
wlr_log_errno(WLR_ERROR, "XWayland: failed to open /dev/null");
_exit(EXIT_FAILURE);
}
if (verbosity < WLR_INFO) {
dup2(devnull, STDOUT_FILENO);
}
if (verbosity < WLR_ERROR) {
dup2(devnull, STDERR_FILENO);
}
// This returns if and only if the call fails
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execvp("Xwayland", argv);
wlr_log_errno(WLR_ERROR, "failed to exec Xwayland");
close(devnull);
_exit(EXIT_FAILURE);
}
static void xwayland_finish_server(struct wlr_xwayland *wlr_xwayland) {
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if (!wlr_xwayland || wlr_xwayland->display == -1) {
return;
}
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if (wlr_xwayland->x_fd_read_event[0]) {
wl_event_source_remove(wlr_xwayland->x_fd_read_event[0]);
wl_event_source_remove(wlr_xwayland->x_fd_read_event[1]);
wlr_xwayland->x_fd_read_event[0] = wlr_xwayland->x_fd_read_event[1] = NULL;
}
if (wlr_xwayland->cursor != NULL) {
free(wlr_xwayland->cursor);
}
xwm_destroy(wlr_xwayland->xwm);
if (wlr_xwayland->client) {
wl_list_remove(&wlr_xwayland->client_destroy.link);
wl_client_destroy(wlr_xwayland->client);
}
if (wlr_xwayland->sigusr1_source) {
wl_event_source_remove(wlr_xwayland->sigusr1_source);
}
safe_close(wlr_xwayland->wl_fd[0]);
safe_close(wlr_xwayland->wl_fd[1]);
safe_close(wlr_xwayland->wm_fd[0]);
safe_close(wlr_xwayland->wm_fd[1]);
memset(wlr_xwayland, 0, offsetof(struct wlr_xwayland, display));
wlr_xwayland->wl_fd[0] = wlr_xwayland->wl_fd[1] = -1;
wlr_xwayland->wm_fd[0] = wlr_xwayland->wm_fd[1] = -1;
/* We do not kill the Xwayland process, it dies to broken pipe
* after we close our side of the wm/wl fds. This is more reliable
* than trying to kill something that might no longer be Xwayland.
*/
}
static void xwayland_finish_display(struct wlr_xwayland *wlr_xwayland) {
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if (!wlr_xwayland || wlr_xwayland->display == -1) {
return;
}
safe_close(wlr_xwayland->x_fd[0]);
safe_close(wlr_xwayland->x_fd[1]);
wlr_xwayland->x_fd[0] = wlr_xwayland->x_fd[1] = -1;
wl_list_remove(&wlr_xwayland->display_destroy.link);
unlink_display_sockets(wlr_xwayland->display);
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wlr_xwayland->display = -1;
wlr_xwayland->display_name[0] = '\0';
}
static bool xwayland_start_server(struct wlr_xwayland *wlr_xwayland);
static bool xwayland_start_server_lazy(struct wlr_xwayland *wlr_xwayland);
static void handle_client_destroy(struct wl_listener *listener, void *data) {
struct wlr_xwayland *wlr_xwayland =
wl_container_of(listener, wlr_xwayland, client_destroy);
if (wlr_xwayland->sigusr1_source) {
// Xwayland failed to start, let the sigusr1 handler deal with it
return;
}
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// Don't call client destroy: it's being destroyed already
wlr_xwayland->client = NULL;
wl_list_remove(&wlr_xwayland->client_destroy.link);
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xwayland_finish_server(wlr_xwayland);
if (time(NULL) - wlr_xwayland->server_start > 5) {
if (wlr_xwayland->lazy) {
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wlr_log(WLR_INFO, "Restarting Xwayland (lazy)");
xwayland_start_server_lazy(wlr_xwayland);
} else {
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wlr_log(WLR_INFO, "Restarting Xwayland");
xwayland_start_server(wlr_xwayland);
}
}
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_xwayland *wlr_xwayland =
wl_container_of(listener, wlr_xwayland, display_destroy);
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// Don't call client destroy: the display is being destroyed, it's too late
if (wlr_xwayland->client) {
wlr_xwayland->client = NULL;
wl_list_remove(&wlr_xwayland->client_destroy.link);
}
wlr_xwayland_destroy(wlr_xwayland);
}
static int xserver_handle_ready(int signal_number, void *data) {
struct wlr_xwayland *wlr_xwayland = data;
int stat_val = -1;
while (waitpid(wlr_xwayland->pid, &stat_val, 0) < 0) {
if (errno == EINTR) {
continue;
}
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wlr_log_errno(WLR_ERROR, "waitpid for Xwayland fork failed");
goto error;
}
if (stat_val) {
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wlr_log(WLR_ERROR, "Xwayland startup failed, not setting up xwm");
goto error;
}
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wlr_log(WLR_DEBUG, "Xserver is ready");
wlr_xwayland->xwm = xwm_create(wlr_xwayland);
if (!wlr_xwayland->xwm) {
goto error;
}
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if (wlr_xwayland->seat) {
xwm_set_seat(wlr_xwayland->xwm, wlr_xwayland->seat);
}
wl_event_source_remove(wlr_xwayland->sigusr1_source);
wlr_xwayland->sigusr1_source = NULL;
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if (wlr_xwayland->cursor != NULL) {
struct wlr_xwayland_cursor *cur = wlr_xwayland->cursor;
xwm_set_cursor(wlr_xwayland->xwm, cur->pixels, cur->stride, cur->width,
cur->height, cur->hotspot_x, cur->hotspot_y);
free(cur);
wlr_xwayland->cursor = NULL;
}
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wlr_signal_emit_safe(&wlr_xwayland->events.ready, wlr_xwayland);
/* ready is a one-shot signal, fire and forget */
wl_signal_init(&wlr_xwayland->events.ready);
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return 1; /* wayland event loop dispatcher's count */
error:
/* clean up */
wlr_xwayland_set_seat(wlr_xwayland, NULL);
xwayland_finish_server(wlr_xwayland);
xwayland_finish_display(wlr_xwayland);
return 1;
}
static int xwayland_socket_connected(int fd, uint32_t mask, void* data){
struct wlr_xwayland *wlr_xwayland = data;
wl_event_source_remove(wlr_xwayland->x_fd_read_event[0]);
wl_event_source_remove(wlr_xwayland->x_fd_read_event[1]);
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wlr_xwayland->x_fd_read_event[0] = wlr_xwayland->x_fd_read_event[1] = NULL;
xwayland_start_server(wlr_xwayland);
return 0;
}
static bool xwayland_start_display(struct wlr_xwayland *wlr_xwayland,
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struct wl_display *wl_display) {
wlr_xwayland->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(wl_display, &wlr_xwayland->display_destroy);
wlr_xwayland->display = open_display_sockets(wlr_xwayland->x_fd);
if (wlr_xwayland->display < 0) {
xwayland_finish_display(wlr_xwayland);
return false;
}
snprintf(wlr_xwayland->display_name, sizeof(wlr_xwayland->display_name),
":%d", wlr_xwayland->display);
return true;
}
static bool xwayland_start_server(struct wlr_xwayland *wlr_xwayland) {
if (socketpair(AF_UNIX, SOCK_STREAM, 0, wlr_xwayland->wl_fd) != 0 ||
socketpair(AF_UNIX, SOCK_STREAM, 0, wlr_xwayland->wm_fd) != 0) {
wlr_log_errno(WLR_ERROR, "socketpair failed");
xwayland_finish_server(wlr_xwayland);
return false;
}
if (!set_cloexec(wlr_xwayland->wl_fd[0], true) ||
!set_cloexec(wlr_xwayland->wl_fd[1], true) ||
!set_cloexec(wlr_xwayland->wm_fd[0], true) ||
!set_cloexec(wlr_xwayland->wm_fd[1], true)) {
xwayland_finish_server(wlr_xwayland);
return false;
}
wlr_xwayland->server_start = time(NULL);
wlr_xwayland->client =
wl_client_create(wlr_xwayland->wl_display, wlr_xwayland->wl_fd[0]);
if (!wlr_xwayland->client) {
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wlr_log_errno(WLR_ERROR, "wl_client_create failed");
xwayland_finish_server(wlr_xwayland);
return false;
}
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wlr_xwayland->wl_fd[0] = -1; /* not ours anymore */
wlr_xwayland->client_destroy.notify = handle_client_destroy;
wl_client_add_destroy_listener(wlr_xwayland->client,
&wlr_xwayland->client_destroy);
struct wl_event_loop *loop = wl_display_get_event_loop(wlr_xwayland->wl_display);
wlr_xwayland->sigusr1_source = wl_event_loop_add_signal(loop, SIGUSR1,
xserver_handle_ready, wlr_xwayland);
wlr_xwayland->pid = fork();
if (wlr_xwayland->pid < 0) {
wlr_log_errno(WLR_ERROR, "fork failed");
xwayland_finish_server(wlr_xwayland);
return false;
} else if (wlr_xwayland->pid == 0) {
/* Double-fork, but we need to forward SIGUSR1 once Xserver(1)
* is ready, or error if there was one. */
pid_t ppid = getppid();
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGUSR1);
sigaddset(&sigset, SIGCHLD);
sigprocmask(SIG_BLOCK, &sigset, NULL);
pid_t pid = fork();
if (pid < 0) {
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wlr_log_errno(WLR_ERROR, "second fork failed");
_exit(EXIT_FAILURE);
} else if (pid == 0) {
exec_xwayland(wlr_xwayland);
}
int sig;
sigwait(&sigset, &sig);
kill(ppid, SIGUSR1);
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wlr_log(WLR_DEBUG, "sent SIGUSR1 to process %d", ppid);
if (sig == SIGCHLD) {
waitpid(pid, NULL, 0);
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
/* close child fds */
/* remain managing x sockets for lazy start */
close(wlr_xwayland->wl_fd[1]);
close(wlr_xwayland->wm_fd[1]);
wlr_xwayland->wl_fd[1] = wlr_xwayland->wm_fd[1] = -1;
return true;
}
static bool xwayland_start_server_lazy(struct wlr_xwayland *wlr_xwayland) {
struct wl_event_loop *loop = wl_display_get_event_loop(wlr_xwayland->wl_display);
wlr_xwayland->x_fd_read_event[0] =
wl_event_loop_add_fd(loop, wlr_xwayland->x_fd[0], WL_EVENT_READABLE,
xwayland_socket_connected, wlr_xwayland);
wlr_xwayland->x_fd_read_event[1] =
wl_event_loop_add_fd(loop, wlr_xwayland->x_fd[1], WL_EVENT_READABLE,
xwayland_socket_connected, wlr_xwayland);
return true;
}
void wlr_xwayland_destroy(struct wlr_xwayland *wlr_xwayland) {
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if (!wlr_xwayland) {
return;
}
wlr_xwayland_set_seat(wlr_xwayland, NULL);
xwayland_finish_server(wlr_xwayland);
xwayland_finish_display(wlr_xwayland);
free(wlr_xwayland);
}
struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
struct wlr_compositor *compositor, bool lazy) {
struct wlr_xwayland *wlr_xwayland = calloc(1, sizeof(struct wlr_xwayland));
if (!wlr_xwayland) {
return NULL;
}
wlr_xwayland->wl_display = wl_display;
wlr_xwayland->compositor = compositor;
wlr_xwayland->lazy = lazy;
wlr_xwayland->x_fd[0] = wlr_xwayland->x_fd[1] = -1;
wlr_xwayland->wl_fd[0] = wlr_xwayland->wl_fd[1] = -1;
wlr_xwayland->wm_fd[0] = wlr_xwayland->wm_fd[1] = -1;
wl_signal_init(&wlr_xwayland->events.new_surface);
wl_signal_init(&wlr_xwayland->events.ready);
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if (!xwayland_start_display(wlr_xwayland, wl_display)) {
goto error_alloc;
}
if (wlr_xwayland->lazy) {
if (!xwayland_start_server_lazy(wlr_xwayland)) {
goto error_display;
}
} else {
if (!xwayland_start_server(wlr_xwayland)) {
goto error_display;
}
}
return wlr_xwayland;
error_display:
xwayland_finish_display(wlr_xwayland);
error_alloc:
free(wlr_xwayland);
return NULL;
}
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void wlr_xwayland_set_cursor(struct wlr_xwayland *wlr_xwayland,
uint8_t *pixels, uint32_t stride, uint32_t width, uint32_t height,
int32_t hotspot_x, int32_t hotspot_y) {
if (wlr_xwayland->xwm != NULL) {
xwm_set_cursor(wlr_xwayland->xwm, pixels, stride, width, height,
hotspot_x, hotspot_y);
return;
}
free(wlr_xwayland->cursor);
wlr_xwayland->cursor = calloc(1, sizeof(struct wlr_xwayland_cursor));
if (wlr_xwayland->cursor == NULL) {
return;
}
wlr_xwayland->cursor->pixels = pixels;
wlr_xwayland->cursor->stride = stride;
wlr_xwayland->cursor->width = width;
wlr_xwayland->cursor->height = height;
wlr_xwayland->cursor->hotspot_x = hotspot_x;
wlr_xwayland->cursor->hotspot_y = hotspot_y;
}
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static void xwayland_handle_seat_destroy(struct wl_listener *listener,
void *data) {
struct wlr_xwayland *xwayland =
wl_container_of(listener, xwayland, seat_destroy);
wlr_xwayland_set_seat(xwayland, NULL);
}
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void wlr_xwayland_set_seat(struct wlr_xwayland *xwayland,
struct wlr_seat *seat) {
if (xwayland->seat) {
wl_list_remove(&xwayland->seat_destroy.link);
}
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xwayland->seat = seat;
if (xwayland->xwm) {
xwm_set_seat(xwayland->xwm, seat);
}
if (seat == NULL) {
return;
}
xwayland->seat_destroy.notify = xwayland_handle_seat_destroy;
wl_signal_add(&seat->events.destroy, &xwayland->seat_destroy);
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}