static int
weston_xserver_handle_event(int listen_fd, uint32_t mask, void *data)
{
struct weston_xserver *mxs = data;
char display[8], s[8];
int sv[2], client_fd;
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
weston_log("socketpair failed\n");
return 1;
}
mxs->process.pid = fork();
switch (mxs->process.pid) {
case 0:
/* SOCK_CLOEXEC closes both ends, so we need to unset
* the flag on the client fd. */
client_fd = dup(sv[1]);
if (client_fd < 0)
return 1;
snprintf(s, sizeof s, "%d", client_fd);
setenv("WAYLAND_SOCKET", s, 1);
snprintf(display, sizeof display, ":%d", mxs->display);
if (execl(XSERVER_PATH,
XSERVER_PATH,
display,
"-wayland",
"-rootless",
"-retro",
"-nolisten", "all",
"-terminate",
NULL) < 0)
weston_log("exec failed: %m\n");
exit(-1);
default:
weston_log("forked X server, pid %d\n", mxs->process.pid);
close(sv[1]);
mxs->client = wl_client_create(mxs->wl_display, sv[0]);
weston_watch_process(&mxs->process);
wl_event_source_remove(mxs->abstract_source);
wl_event_source_remove(mxs->unix_source);
break;
case -1:
weston_log( "failed to fork\n");
break;
}
return 1;
}
static pid_t
spawn_xserver(struct weston_xserver *wxs)
{
int sv[2], wm[2];
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
weston_log("wl connection socketpair failed\n");
return 1;
}
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wm) < 0) {
weston_log("X wm connection socketpair failed\n");
return 1;
}
QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
env.insert(QStringLiteral("WAYLAND_SOCKET"), QString::number(dup(sv[1])));
QString display = QStringLiteral(":%1").arg(wxs->display);
QString abstract_fd = QString::number(dup(wxs->abstract_fd));
QString unix_fd = QString::number(dup(wxs->unix_fd));
QString wm_fd = QString::number(dup(wm[1]));
s_process = new Process;
s_process->setProcessChannelMode(QProcess::ForwardedChannels);
s_process->setProcessEnvironment(env);
s_process->connect(s_process, (void (QProcess::*)(int))&QProcess::finished, [wxs](int exitCode) {
weston_xserver_exited(wxs, exitCode);
if (s_process) {
delete s_process;
s_process = nullptr;
}
});
s_process->start(QStringLiteral("Xwayland"), {
display,
QStringLiteral("-rootless"),
QStringLiteral("-listen"), abstract_fd,
QStringLiteral("-listen"), unix_fd,
QStringLiteral("-wm"), wm_fd,
QStringLiteral("-terminate") });
close(sv[1]);
wxs->client = wl_client_create(wxs->wl_display, sv[0]);
close(wm[1]);
wxs->wm_fd = wm[0];
return s_process->processId();
}
static int
weston_xserver_handle_event(int listen_fd, uint32_t mask, void *data)
{
struct weston_xserver *wxs = data;
char display[8], s[8], abstract_fd[8], unix_fd[8], wm_fd[8];
int sv[2], wm[2], fd;
char *xserver = NULL;
struct weston_config_section *section;
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
weston_log("wl connection socketpair failed\n");
return 1;
}
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, wm) < 0) {
weston_log("X wm connection socketpair failed\n");
return 1;
}
wxs->process.pid = fork();
switch (wxs->process.pid) {
case 0:
/* SOCK_CLOEXEC closes both ends, so we need to unset
* the flag on the client fd. */
fd = dup(sv[1]);
if (fd < 0)
goto fail;
snprintf(s, sizeof s, "%d", fd);
setenv("WAYLAND_SOCKET", s, 1);
snprintf(display, sizeof display, ":%d", wxs->display);
fd = dup(wxs->abstract_fd);
if (fd < 0)
goto fail;
snprintf(abstract_fd, sizeof abstract_fd, "%d", fd);
fd = dup(wxs->unix_fd);
if (fd < 0)
goto fail;
snprintf(unix_fd, sizeof unix_fd, "%d", fd);
fd = dup(wm[1]);
if (fd < 0)
goto fail;
snprintf(wm_fd, sizeof wm_fd, "%d", fd);
section = weston_config_get_section(wxs->compositor->config,
"xwayland", NULL, NULL);
weston_config_section_get_string(section, "path",
&xserver, XSERVER_PATH);
/* Ignore SIGUSR1 in the child, which will make the X
* server send SIGUSR1 to the parent (weston) when
* it's done with initialization. During
* initialization the X server will round trip and
* block on the wayland compositor, so avoid making
* blocking requests (like xcb_connect_to_fd) until
* it's done with that. */
signal(SIGUSR1, SIG_IGN);
if (execl(xserver,
xserver,
display,
"-rootless",
"-listen", abstract_fd,
"-listen", unix_fd,
"-wm", wm_fd,
"-terminate",
NULL) < 0)
weston_log("exec of '%s %s -rootless "
"-listen %s -listen %s -wm %s "
"-terminate' failed: %m\n",
xserver, display,
abstract_fd, unix_fd, wm_fd);
fail:
_exit(EXIT_FAILURE);
default:
weston_log("forked X server, pid %d\n", wxs->process.pid);
close(sv[1]);
wxs->client = wl_client_create(wxs->wl_display, sv[0]);
close(wm[1]);
wxs->wm_fd = wm[0];
weston_watch_process(&wxs->process);
wl_event_source_remove(wxs->abstract_source);
wl_event_source_remove(wxs->unix_source);
break;
case -1:
weston_log( "failed to fork\n");
break;
}
return 1;
}
gboolean
meta_xwayland_start (MetaXWaylandManager *manager,
struct wl_display *wl_display)
{
int xwayland_client_fd[2];
int displayfd[2];
gboolean started = FALSE;
g_autoptr(GSubprocessLauncher) launcher = NULL;
GSubprocessFlags flags;
GSubprocess *proc;
GError *error = NULL;
if (!choose_xdisplay (manager))
goto out;
/* We want xwayland to be a wayland client so we make a socketpair to setup a
* wayland protocol connection. */
if (socketpair (AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, xwayland_client_fd) < 0)
{
g_warning ("xwayland_client_fd socketpair failed\n");
goto out;
}
if (socketpair (AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, displayfd) < 0)
{
g_warning ("displayfd socketpair failed\n");
goto out;
}
/* xwayland, please. */
flags = G_SUBPROCESS_FLAGS_NONE;
if (getenv ("XWAYLAND_STFU"))
{
flags |= G_SUBPROCESS_FLAGS_STDOUT_SILENCE;
flags |= G_SUBPROCESS_FLAGS_STDERR_SILENCE;
}
launcher = g_subprocess_launcher_new (flags);
g_subprocess_launcher_take_fd (launcher, xwayland_client_fd[1], 3);
g_subprocess_launcher_take_fd (launcher, manager->abstract_fd, 4);
g_subprocess_launcher_take_fd (launcher, manager->unix_fd, 5);
g_subprocess_launcher_take_fd (launcher, displayfd[1], 6);
g_subprocess_launcher_setenv (launcher, "WAYLAND_SOCKET", "3", TRUE);
proc = g_subprocess_launcher_spawn (launcher, &error,
XWAYLAND_PATH, manager->display_name,
"-rootless", "-noreset",
"-listen", "4",
"-listen", "5",
"-displayfd", "6",
NULL);
if (!proc)
{
g_error ("Failed to spawn Xwayland: %s", error->message);
goto out;
}
g_subprocess_wait_async (proc, NULL, xserver_died, NULL);
g_unix_fd_add (displayfd[0], G_IO_IN, on_displayfd_ready, manager);
manager->client = wl_client_create (wl_display, xwayland_client_fd[0]);
/* We need to run a mainloop until we know xwayland has a binding
* for our xserver interface at which point we can assume it's
* ready to start accepting connections. */
manager->init_loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (manager->init_loop);
started = TRUE;
out:
if (!started)
{
unlink (manager->lock_file);
g_clear_pointer (&manager->lock_file, g_free);
}
return started;
}
