wlroots-hyprland/xwayland/xwayland.c

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#define _XOPEN_SOURCE 700
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#define _DEFAULT_SOURCE
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#ifdef __FreeBSD__
// for SOCK_CLOEXEC
#define __BSD_VISIBLE 1
#endif
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.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 <stdlib.h>
#include <errno.h>
#include <wayland-server.h>
#include "wlr/util/log.h"
#include "wlr/xwayland.h"
#include "sockets.h"
#include "xwm.h"
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#ifdef __FreeBSD__
static inline int clearenv(void) {
extern char **environ;
environ[0] = NULL;
return 0;
}
#endif
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;
}
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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;
}
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);
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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 };
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) {
wlr_log_errno(L_ERROR, "alloc/print failure");
_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);
}
if (clearenv()) {
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wlr_log_errno(L_ERROR, "clearenv failed");
_exit(EXIT_FAILURE);
}
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setenv("XDG_RUNTIME_DIR", xdg_runtime, true);
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(L_INFO, "WAYLAND_SOCKET=%d Xwayland :%d -rootless -terminate -listen %d -listen %d -wm %d",
wlr_xwayland->wl_fd[1], 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
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execvp("Xwayland", argv);
}
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 wlr_xwayland *wlr_xwayland = wl_container_of(listener, wlr_xwayland, destroy_listener);
/* don't call client destroy */
wlr_xwayland->client = NULL;
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wl_list_remove(&wlr_xwayland->destroy_listener.link);
wlr_xwayland_finish(wlr_xwayland);
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if (time(NULL) - wlr_xwayland->server_start > 5) {
wlr_xwayland_init(wlr_xwayland, wlr_xwayland->wl_display,
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wlr_xwayland->compositor);
}
}
static void wlr_xwayland_finish(struct wlr_xwayland *wlr_xwayland) {
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if (!wlr_xwayland || wlr_xwayland->display == -1) {
return;
}
if (wlr_xwayland->client) {
wl_list_remove(&wlr_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);
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wlr_xwayland->display = -1;
unsetenv("DISPLAY");
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/* 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 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;
}
wlr_log_errno(L_ERROR, "waitpid for Xwayland fork failed");
return 1;
}
if (stat_val) {
wlr_log(L_ERROR, "Xwayland startup failed, not setting up xwm");
return 1;
}
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);
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return 1; /* wayland event loop dispatcher's count */
}
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;
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wl_signal_init(&wlr_xwayland->events.new_surface);
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;
}
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;
}
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// unset $DISPLAY while XWayland starts
unsetenv("DISPLAY");
wlr_xwayland->wl_fd[0] = -1; /* not ours anymore */
wlr_xwayland->destroy_listener.notify = xwayland_destroy_event;
wl_client_add_destroy_listener(wlr_xwayland->client, &wlr_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);
if ((wlr_xwayland->pid = fork()) == 0) {
/* Double-fork, but we need to forward SIGUSR1 once Xserver(1)
* is ready, or error if there was one. */
pid_t pid, ppid;
sigset_t sigset;
int sig;
ppid = getppid();
sigemptyset(&sigset);
sigaddset(&sigset, SIGUSR1);
sigaddset(&sigset, SIGCHLD);
sigprocmask(SIG_BLOCK, &sigset, NULL);
if ((pid = fork()) == 0) {
exec_xwayland(wlr_xwayland);
wlr_log_errno(L_ERROR, "failed to exec Xwayland");
_exit(EXIT_FAILURE);
}
if (pid < 0) {
wlr_log_errno(L_ERROR, "second fork failed");
_exit(EXIT_FAILURE);
}
sigwait(&sigset, &sig);
kill(ppid, SIGUSR1);
wlr_log(L_DEBUG, "sent SIGUSR1 to process %d", ppid);
if (sig == SIGCHLD) {
waitpid(pid, NULL, 0);
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
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;
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;
}