xwayland/launcher.c - weston - Git Browser for ODROID

 /*
  * Copyright © 2011 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial
  * portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */

 #include "config.h"

 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <unistd.h>
 #include <signal.h>

 #include "xwayland.h"
 #include "shared/helpers.h"


 static int
 handle_sigusr1(int signal_number, void *data)
 {
 	struct weston_xserver *wxs = data;

 	/* We'd be safer if we actually had the struct
 	 * signalfd_siginfo from the signalfd data and could verify
 	 * this came from Xwayland.*/
 	wxs->wm = weston_wm_create(wxs, wxs->wm_fd);
 	wl_event_source_remove(wxs->sigusr1_source);

 	return 1;
 }

 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;
 }

 static void
 weston_xserver_shutdown(struct weston_xserver *wxs)
 {
 	char path[256];

 	snprintf(path, sizeof path, "/tmp/.X%d-lock", wxs->display);
 	unlink(path);
 	snprintf(path, sizeof path, "/tmp/.X11-unix/X%d", wxs->display);
 	unlink(path);
 	if (wxs->process.pid == 0) {
 		wl_event_source_remove(wxs->abstract_source);
 		wl_event_source_remove(wxs->unix_source);
 	}
 	close(wxs->abstract_fd);
 	close(wxs->unix_fd);
 	if (wxs->wm) {
 		weston_wm_destroy(wxs->wm);
 		wxs->wm = NULL;
 	}
 	wxs->loop = NULL;
 }

 static void
 weston_xserver_cleanup(struct weston_process *process, int status)
 {
 	struct weston_xserver *wxs =
 		container_of(process, struct weston_xserver, process);

 	wxs->process.pid = 0;
 	wxs->client = NULL;
 	wxs->resource = NULL;

 	wxs->abstract_source =
 		wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
 				     WL_EVENT_READABLE,
 				     weston_xserver_handle_event, wxs);

 	wxs->unix_source =
 		wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
 				     WL_EVENT_READABLE,
 				     weston_xserver_handle_event, wxs);

 	if (wxs->wm) {
 		weston_log("xserver exited, code %d\n", status);
 		weston_wm_destroy(wxs->wm);
 		wxs->wm = NULL;
 	} else {
 		/* If the X server crashes before it binds to the
 		 * xserver interface, shut down and don't try
 		 * again. */
 		weston_log("xserver crashing too fast: %d\n", status);
 		weston_xserver_shutdown(wxs);
 	}
 }

 static int
 bind_to_abstract_socket(int display)
 {
 	struct sockaddr_un addr;
 	socklen_t size, name_size;
 	int fd;

 	fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
 	if (fd < 0)
 		return -1;

 	addr.sun_family = AF_LOCAL;
 	name_size = snprintf(addr.sun_path, sizeof addr.sun_path,
 			     "%c/tmp/.X11-unix/X%d", 0, display);
 	size = offsetof(struct sockaddr_un, sun_path) + name_size;
 	if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
 		weston_log("failed to bind to @%s: %m\n", addr.sun_path + 1);
 		close(fd);
 		return -1;
 	}

 	if (listen(fd, 1) < 0) {
 		close(fd);
 		return -1;
 	}

 	return fd;
 }

 static int
 bind_to_unix_socket(int display)
 {
 	struct sockaddr_un addr;
 	socklen_t size, name_size;
 	int fd;

 	fd = socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
 	if (fd < 0)
 		return -1;

 	addr.sun_family = AF_LOCAL;
 	name_size = snprintf(addr.sun_path, sizeof addr.sun_path,
 			     "/tmp/.X11-unix/X%d", display) + 1;
 	size = offsetof(struct sockaddr_un, sun_path) + name_size;
 	unlink(addr.sun_path);
 	if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
 		weston_log("failed to bind to %s: %m\n", addr.sun_path);
 		close(fd);
 		return -1;
 	}

 	if (listen(fd, 1) < 0) {
 		unlink(addr.sun_path);
 		close(fd);
 		return -1;
 	}

 	return fd;
 }

 static int
 create_lockfile(int display, char *lockfile, size_t lsize)
 {
 	char pid[16], *end;
 	int fd, size;
 	pid_t other;

 	snprintf(lockfile, lsize, "/tmp/.X%d-lock", display);
 	fd = open(lockfile, O_WRONLY | O_CLOEXEC | O_CREAT | O_EXCL, 0444);
 	if (fd < 0 && errno == EEXIST) {
 		fd = open(lockfile, O_CLOEXEC | O_RDONLY);
 		if (fd < 0 || read(fd, pid, 11) != 11) {
 			weston_log("can't read lock file %s: %s\n",
 				lockfile, strerror(errno));
 			if (fd >= 0)
 				close (fd);

 			errno = EEXIST;
 			return -1;
 		}

 		other = strtol(pid, &end, 0);
 		if (end != pid + 10) {
 			weston_log("can't parse lock file %s\n",
 				lockfile);
 			close(fd);
 			errno = EEXIST;
 			return -1;
 		}

 		if (kill(other, 0) < 0 && errno == ESRCH) {
 			/* stale lock file; unlink and try again */
 			weston_log("unlinking stale lock file %s\n", lockfile);
 			close(fd);
 			if (unlink(lockfile))
 				/* If we fail to unlink, return EEXIST
 				   so we try the next display number.*/
 				errno = EEXIST;
 			else
 				errno = EAGAIN;
 			return -1;
 		}

 		close(fd);
 		errno = EEXIST;
 		return -1;
 	} else if (fd < 0) {
 		weston_log("failed to create lock file %s: %s\n",
 			lockfile, strerror(errno));
 		return -1;
 	}

 	/* Subtle detail: we use the pid of the wayland
 	 * compositor, not the xserver in the lock file. */
 	size = snprintf(pid, sizeof pid, "%10d\n", getpid());
 	if (write(fd, pid, size) != size) {
 		unlink(lockfile);
 		close(fd);
 		return -1;
 	}

 	close(fd);

 	return 0;
 }

 static void
 weston_xserver_destroy(struct wl_listener *l, void *data)
 {
 	struct weston_xserver *wxs =
 		container_of(l, struct weston_xserver, destroy_listener);

 	if (!wxs)
 		return;

 	if (wxs->loop)
 		weston_xserver_shutdown(wxs);

 	free(wxs);
 }

 WL_EXPORT int
 module_init(struct weston_compositor *compositor,
 	    int *argc, char *argv[])

 {
 	struct wl_display *display = compositor->wl_display;
 	struct weston_xserver *wxs;
 	char lockfile[256], display_name[8];

 	wxs = zalloc(sizeof *wxs);
 	if (wxs == NULL)
 		return -1;
 	wxs->process.cleanup = weston_xserver_cleanup;
 	wxs->wl_display = display;
 	wxs->compositor = compositor;

 	wxs->display = 0;

  retry:
 	if (create_lockfile(wxs->display, lockfile, sizeof lockfile) < 0) {
 		if (errno == EAGAIN) {
 			goto retry;
 		} else if (errno == EEXIST) {
 			wxs->display++;
 			goto retry;
 		} else {
 			free(wxs);
 			return -1;
 		}
 	}

 	wxs->abstract_fd = bind_to_abstract_socket(wxs->display);
 	if (wxs->abstract_fd < 0 && errno == EADDRINUSE) {
 		wxs->display++;
 		unlink(lockfile);
 		goto retry;
 	}

 	wxs->unix_fd = bind_to_unix_socket(wxs->display);
 	if (wxs->unix_fd < 0) {
 		unlink(lockfile);
 		close(wxs->abstract_fd);
 		free(wxs);
 		return -1;
 	}

 	snprintf(display_name, sizeof display_name, ":%d", wxs->display);
 	weston_log("xserver listening on display %s\n", display_name);
 	setenv("DISPLAY", display_name, 1);

 	wxs->loop = wl_display_get_event_loop(display);
 	wxs->abstract_source =
 		wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
 				     WL_EVENT_READABLE,
 				     weston_xserver_handle_event, wxs);
 	wxs->unix_source =
 		wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
 				     WL_EVENT_READABLE,
 				     weston_xserver_handle_event, wxs);

 	wxs->sigusr1_source = wl_event_loop_add_signal(wxs->loop, SIGUSR1,
 						       handle_sigusr1, wxs);
 	wxs->destroy_listener.notify = weston_xserver_destroy;
 	wl_signal_add(&compositor->destroy_signal, &wxs->destroy_listener);

 	return 0;
 }
	/*
	* Copyright © 2011 Intel Corporation
	*
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sublicense, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial
	* portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/

	#include "config.h"

	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <unistd.h>
	#include <signal.h>

	#include "xwayland.h"
	#include "shared/helpers.h"


	static int
	handle_sigusr1(int signal_number, void *data)
	{
	struct weston_xserver *wxs = data;

	/* We'd be safer if we actually had the struct
	* signalfd_siginfo from the signalfd data and could verify
	* this came from Xwayland.*/
	wxs->wm = weston_wm_create(wxs, wxs->wm_fd);
	wl_event_source_remove(wxs->sigusr1_source);

	return 1;
	}

	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;
	}

	static void
	weston_xserver_shutdown(struct weston_xserver *wxs)
	{
	char path[256];

	snprintf(path, sizeof path, "/tmp/.X%d-lock", wxs->display);
	unlink(path);
	snprintf(path, sizeof path, "/tmp/.X11-unix/X%d", wxs->display);
	unlink(path);
	if (wxs->process.pid == 0) {
	wl_event_source_remove(wxs->abstract_source);
	wl_event_source_remove(wxs->unix_source);
	}
	close(wxs->abstract_fd);
	close(wxs->unix_fd);
	if (wxs->wm) {
	weston_wm_destroy(wxs->wm);
	wxs->wm = NULL;
	}
	wxs->loop = NULL;
	}

	static void
	weston_xserver_cleanup(struct weston_process *process, int status)
	{
	struct weston_xserver *wxs =
	container_of(process, struct weston_xserver, process);

	wxs->process.pid = 0;
	wxs->client = NULL;
	wxs->resource = NULL;

	wxs->abstract_source =
	wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
	WL_EVENT_READABLE,
	weston_xserver_handle_event, wxs);

	wxs->unix_source =
	wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
	WL_EVENT_READABLE,
	weston_xserver_handle_event, wxs);

	if (wxs->wm) {
	weston_log("xserver exited, code %d\n", status);
	weston_wm_destroy(wxs->wm);
	wxs->wm = NULL;
	} else {
	/* If the X server crashes before it binds to the
	* xserver interface, shut down and don't try
	* again. */
	weston_log("xserver crashing too fast: %d\n", status);
	weston_xserver_shutdown(wxs);
	}
	}

	static int
	bind_to_abstract_socket(int display)
	{
	struct sockaddr_un addr;
	socklen_t size, name_size;
	int fd;

	fd = socket(PF_LOCAL, SOCK_STREAM \| SOCK_CLOEXEC, 0);
	if (fd < 0)
	return -1;

	addr.sun_family = AF_LOCAL;
	name_size = snprintf(addr.sun_path, sizeof addr.sun_path,
	"%c/tmp/.X11-unix/X%d", 0, display);
	size = offsetof(struct sockaddr_un, sun_path) + name_size;
	if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
	weston_log("failed to bind to @%s: %m\n", addr.sun_path + 1);
	close(fd);
	return -1;
	}

	if (listen(fd, 1) < 0) {
	close(fd);
	return -1;
	}

	return fd;
	}

	static int
	bind_to_unix_socket(int display)
	{
	struct sockaddr_un addr;
	socklen_t size, name_size;
	int fd;

	fd = socket(PF_LOCAL, SOCK_STREAM \| SOCK_CLOEXEC, 0);
	if (fd < 0)
	return -1;

	addr.sun_family = AF_LOCAL;
	name_size = snprintf(addr.sun_path, sizeof addr.sun_path,
	"/tmp/.X11-unix/X%d", display) + 1;
	size = offsetof(struct sockaddr_un, sun_path) + name_size;
	unlink(addr.sun_path);
	if (bind(fd, (struct sockaddr *) &addr, size) < 0) {
	weston_log("failed to bind to %s: %m\n", addr.sun_path);
	close(fd);
	return -1;
	}

	if (listen(fd, 1) < 0) {
	unlink(addr.sun_path);
	close(fd);
	return -1;
	}

	return fd;
	}

	static int
	create_lockfile(int display, char *lockfile, size_t lsize)
	{
	char pid[16], *end;
	int fd, size;
	pid_t other;

	snprintf(lockfile, lsize, "/tmp/.X%d-lock", display);
	fd = open(lockfile, O_WRONLY \| O_CLOEXEC \| O_CREAT \| O_EXCL, 0444);
	if (fd < 0 && errno == EEXIST) {
	fd = open(lockfile, O_CLOEXEC \| O_RDONLY);
	if (fd < 0 \|\| read(fd, pid, 11) != 11) {
	weston_log("can't read lock file %s: %s\n",
	lockfile, strerror(errno));
	if (fd >= 0)
	close (fd);

	errno = EEXIST;
	return -1;
	}

	other = strtol(pid, &end, 0);
	if (end != pid + 10) {
	weston_log("can't parse lock file %s\n",
	lockfile);
	close(fd);
	errno = EEXIST;
	return -1;
	}

	if (kill(other, 0) < 0 && errno == ESRCH) {
	/* stale lock file; unlink and try again */
	weston_log("unlinking stale lock file %s\n", lockfile);
	close(fd);
	if (unlink(lockfile))
	/* If we fail to unlink, return EEXIST
	so we try the next display number.*/
	errno = EEXIST;
	else
	errno = EAGAIN;
	return -1;
	}

	close(fd);
	errno = EEXIST;
	return -1;
	} else if (fd < 0) {
	weston_log("failed to create lock file %s: %s\n",
	lockfile, strerror(errno));
	return -1;
	}

	/* Subtle detail: we use the pid of the wayland
	* compositor, not the xserver in the lock file. */
	size = snprintf(pid, sizeof pid, "%10d\n", getpid());
	if (write(fd, pid, size) != size) {
	unlink(lockfile);
	close(fd);
	return -1;
	}

	close(fd);

	return 0;
	}

	static void
	weston_xserver_destroy(struct wl_listener l, void data)
	{
	struct weston_xserver *wxs =
	container_of(l, struct weston_xserver, destroy_listener);

	if (!wxs)
	return;

	if (wxs->loop)
	weston_xserver_shutdown(wxs);

	free(wxs);
	}

	WL_EXPORT int
	module_init(struct weston_compositor *compositor,
	int argc, char argv[])

	{
	struct wl_display *display = compositor->wl_display;
	struct weston_xserver *wxs;
	char lockfile[256], display_name[8];

	wxs = zalloc(sizeof *wxs);
	if (wxs == NULL)
	return -1;
	wxs->process.cleanup = weston_xserver_cleanup;
	wxs->wl_display = display;
	wxs->compositor = compositor;

	wxs->display = 0;

	retry:
	if (create_lockfile(wxs->display, lockfile, sizeof lockfile) < 0) {
	if (errno == EAGAIN) {
	goto retry;
	} else if (errno == EEXIST) {
	wxs->display++;
	goto retry;
	} else {
	free(wxs);
	return -1;
	}
	}

	wxs->abstract_fd = bind_to_abstract_socket(wxs->display);
	if (wxs->abstract_fd < 0 && errno == EADDRINUSE) {
	wxs->display++;
	unlink(lockfile);
	goto retry;
	}

	wxs->unix_fd = bind_to_unix_socket(wxs->display);
	if (wxs->unix_fd < 0) {
	unlink(lockfile);
	close(wxs->abstract_fd);
	free(wxs);
	return -1;
	}

	snprintf(display_name, sizeof display_name, ":%d", wxs->display);
	weston_log("xserver listening on display %s\n", display_name);
	setenv("DISPLAY", display_name, 1);

	wxs->loop = wl_display_get_event_loop(display);
	wxs->abstract_source =
	wl_event_loop_add_fd(wxs->loop, wxs->abstract_fd,
	WL_EVENT_READABLE,
	weston_xserver_handle_event, wxs);
	wxs->unix_source =
	wl_event_loop_add_fd(wxs->loop, wxs->unix_fd,
	WL_EVENT_READABLE,
	weston_xserver_handle_event, wxs);

	wxs->sigusr1_source = wl_event_loop_add_signal(wxs->loop, SIGUSR1,
	handle_sigusr1, wxs);
	wxs->destroy_listener.notify = weston_xserver_destroy;
	wl_signal_add(&compositor->destroy_signal, &wxs->destroy_listener);

	return 0;
	}