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#define _XOPEN_SOURCE 700
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/socket.h>
#include <time.h>
#include <errno.h>
#include <wayland-server.h>
#include "wlr/util/log.h"
#include "wlr/xwayland.h"
#include "sockets.h"
#include "xwm.h"
static void safe_close(int fd) {
if (fd >= 0) {
close(fd);
}
}
static int unset_cloexec(int fd) {
if (fcntl(fd, F_SETFD, 0) != 0) {
wlr_log_errno(L_ERROR, "fcntl() failed on fd %d", fd);
return -1;
}
return 0;
}
static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
if (unset_cloexec(wlr_xwayland->x_fd[0]) ||
unset_cloexec(wlr_xwayland->x_fd[1]) ||
unset_cloexec(wlr_xwayland->wm_fd[1]) ||
unset_cloexec(wlr_xwayland->wl_fd[1])) {
exit(EXIT_FAILURE);
}
/* Make Xwayland signal us when it's ready */
signal(SIGUSR1, SIG_IGN);
char *argv[11] = { 0 };
argv[0] = "Xwayland";
if (asprintf(&argv[1], ":%d", wlr_xwayland->display) < 0) {
wlr_log_errno(L_ERROR, "asprintf failed");
exit(EXIT_FAILURE);
}
argv[2] = "-rootless";
argv[3] = "-terminate";
argv[4] = "-listen";
if (asprintf(&argv[5], "%d", wlr_xwayland->x_fd[0]) < 0) {
wlr_log_errno(L_ERROR, "asprintf failed");
exit(EXIT_FAILURE);
}
argv[6] = "-listen";
if (asprintf(&argv[7], "%d", wlr_xwayland->x_fd[1]) < 0) {
wlr_log_errno(L_ERROR, "asprintf failed");
exit(EXIT_FAILURE);
}
argv[8] = "-wm";
if (asprintf(&argv[9], "%d", wlr_xwayland->wm_fd[1]) < 0) {
wlr_log_errno(L_ERROR, "asprintf failed");
exit(EXIT_FAILURE);
}
const char *xdg_runtime = getenv("XDG_RUNTIME_DIR");
if (!xdg_runtime) {
wlr_log(L_ERROR, "XDG_RUNTIME_DIR is not set");
exit(EXIT_FAILURE);
}
char *envp[3] = { 0 };
if (asprintf(&envp[0], "XDG_RUNTIME_DIR=%s", xdg_runtime) < 0 ||
asprintf(&envp[1], "WAYLAND_SOCKET=%d", wlr_xwayland->wl_fd[1]) < 0) {
wlr_log_errno(L_ERROR, "asprintf failed");
exit(EXIT_FAILURE);
}
wlr_log(L_INFO, "Xwayland :%d -rootless -terminate -listen %d -listen %d -wm %d",
wlr_xwayland->display, wlr_xwayland->x_fd[0], wlr_xwayland->x_fd[1],
wlr_xwayland->wm_fd[1]);
// TODO: close stdout/err depending on log level
execvpe("Xwayland", argv, envp);
}
static bool wlr_xwayland_init(struct wlr_xwayland *wlr_xwayland,
struct wl_display *wl_display, struct wlr_compositor *compositor);
static void wlr_xwayland_finish(struct wlr_xwayland *wlr_xwayland);
static void xwayland_destroy_event(struct wl_listener *listener, void *data) {
struct wl_client *client = data;
struct wlr_xwayland *wlr_xwayland = wl_container_of(client, wlr_xwayland, client);
/* don't call client destroy */
wlr_xwayland->client = NULL;
wlr_xwayland_finish(wlr_xwayland);
if (wlr_xwayland->server_start - time(NULL) > 5) {
wlr_xwayland_init(wlr_xwayland, wlr_xwayland->wl_display,
wlr_xwayland->compositor);
}
}
static struct wl_listener xwayland_destroy_listener = {
.notify = xwayland_destroy_event,
};
static void wlr_xwayland_finish(struct wlr_xwayland *wlr_xwayland) {
if (wlr_xwayland->client) {
wl_list_remove(&xwayland_destroy_listener.link);
wl_client_destroy(wlr_xwayland->client);
}
if (wlr_xwayland->sigusr1_source) {
wl_event_source_remove(wlr_xwayland->sigusr1_source);
}
xwm_destroy(wlr_xwayland->xwm);
safe_close(wlr_xwayland->x_fd[0]);
safe_close(wlr_xwayland->x_fd[1]);
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]);
unlink_display_sockets(wlr_xwayland->display);
unsetenv("DISPLAY");
/* kill Xwayland process? */
}
static int xserver_handle_ready(int signal_number, void *data) {
struct wlr_xwayland *wlr_xwayland = data;
wlr_log(L_DEBUG, "Xserver is ready");
wlr_xwayland->xwm = xwm_create(wlr_xwayland);
if (!wlr_xwayland->xwm) {
wlr_xwayland_finish(wlr_xwayland);
return 1;
}
wl_event_source_remove(wlr_xwayland->sigusr1_source);
wlr_xwayland->sigusr1_source = NULL;
char display_name[16];
snprintf(display_name, sizeof(display_name), ":%d", wlr_xwayland->display);
setenv("DISPLAY", display_name, true);
return 1;
}
static bool wlr_xwayland_init(struct wlr_xwayland *wlr_xwayland,
struct wl_display *wl_display, struct wlr_compositor *compositor) {
memset(wlr_xwayland, 0, sizeof(struct wlr_xwayland));
wlr_xwayland->wl_display = wl_display;
wlr_xwayland->compositor = compositor;
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;
wlr_xwayland->display = open_display_sockets(wlr_xwayland->x_fd);
if (wlr_xwayland->display < 0) {
wlr_xwayland_finish(wlr_xwayland);
return false;
}
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wlr_xwayland->wl_fd) != 0 ||
socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wlr_xwayland->wm_fd) != 0) {
wlr_log_errno(L_ERROR, "failed to create socketpair");
wlr_xwayland_finish(wlr_xwayland);
return false;
}
if ((wlr_xwayland->pid = fork()) == 0) {
exec_xwayland(wlr_xwayland);
wlr_log_errno(L_ERROR, "execvpe failed");
exit(EXIT_FAILURE);
}
if (wlr_xwayland->pid < 0) {
wlr_log_errno(L_ERROR, "fork failed");
wlr_xwayland_finish(wlr_xwayland);
return false;
}
/* close child fds */
close(wlr_xwayland->x_fd[0]);
close(wlr_xwayland->x_fd[1]);
close(wlr_xwayland->wl_fd[1]);
close(wlr_xwayland->wm_fd[1]);
wlr_xwayland->x_fd[0] = wlr_xwayland->x_fd[1] = -1;
wlr_xwayland->wl_fd[1] = wlr_xwayland->wm_fd[1] = -1;
wlr_xwayland->server_start = time(NULL);
if (!(wlr_xwayland->client = wl_client_create(wl_display, wlr_xwayland->wl_fd[0]))) {
wlr_log_errno(L_ERROR, "wl_client_create failed");
wlr_xwayland_finish(wlr_xwayland);
return false;
}
wl_client_add_destroy_listener(wlr_xwayland->client, &xwayland_destroy_listener);
struct wl_event_loop *loop = wl_display_get_event_loop(wl_display);
wlr_xwayland->sigusr1_source = wl_event_loop_add_signal(loop, SIGUSR1, xserver_handle_ready, wlr_xwayland);
return true;
}
void wlr_xwayland_destroy(struct wlr_xwayland *wlr_xwayland) {
wlr_xwayland_finish(wlr_xwayland);
free(wlr_xwayland);
}
struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
struct wlr_compositor *compositor) {
struct wlr_xwayland *wlr_xwayland = calloc(1, sizeof(struct wlr_xwayland));
if (wlr_xwayland_init(wlr_xwayland, wl_display, compositor)) {
return wlr_xwayland;
}
free(wlr_xwayland);
return NULL;
}
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