weston/compositor/main.c

/*
 * Copyright © 2010-2011 Intel Corporation
 * Copyright © 2008-2011 Kristian Høgsberg
 * Copyright © 2012-2018 Collabora, Ltd.
 * Copyright © 2010-2011 Benjamin Franzke
 * Copyright © 2013 Jason Ekstrand
 * Copyright © 2017, 2018 General Electric Company
 *
 * 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 <unistd.h>
#include <signal.h>
#include <errno.h>
#include <dlfcn.h>
#include <stdint.h>
#include <string.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <libinput.h>
#include <libevdev/libevdev.h>
#include <linux/input-event-codes.h>
#include <sys/time.h>
#include <linux/limits.h>

#include "weston.h"
#include "compositor.h"
#include "../shared/os-compatibility.h"
#include "../shared/helpers.h"
#include "../shared/string-helpers.h"
#include "git-version.h"
#include "version.h"
#include "weston.h"

#include "compositor-drm.h"
#include "compositor-headless.h"
#include "compositor-rdp.h"
#include "compositor-fbdev.h"
#include "compositor-x11.h"
#include "compositor-wayland.h"
#include "windowed-output-api.h"
#include "weston-debug.h"
#include "../remoting/remoting-plugin.h"

#define WINDOW_TITLE "Weston Compositor"

struct wet_output_config {
	int width;
	int height;
	int32_t scale;
	uint32_t transform;
};

struct wet_compositor;
struct wet_layoutput;

struct wet_head_tracker {
	struct wl_listener head_destroy_listener;
};

/** User data for each weston_output */
struct wet_output {
	struct weston_output *output;
	struct wl_listener output_destroy_listener;
	struct wet_layoutput *layoutput;
	struct wl_list link;	/**< in wet_layoutput::output_list */
};

#define MAX_CLONE_HEADS 16

struct wet_head_array {
	struct weston_head *heads[MAX_CLONE_HEADS];	/**< heads to add */
	unsigned n;				/**< the number of heads */
};

/** A layout output
 *
 * Contains wet_outputs that are all clones (independent CRTCs).
 * Stores output layout information in the future.
 */
struct wet_layoutput {
	struct wet_compositor *compositor;
	struct wl_list compositor_link;	/**< in wet_compositor::layoutput_list */
	struct wl_list output_list;	/**< wet_output::link */
	char *name;
	struct weston_config_section *section;
	struct wet_head_array add;	/**< tmp: heads to add as clones */
};

struct wet_compositor {
	struct weston_compositor *compositor;
	struct weston_config *config;
	struct wet_output_config *parsed_options;
	bool drm_use_current_mode;
	struct wl_listener heads_changed_listener;
	int (*simple_output_configure)(struct weston_output *output);
	bool init_failed;
	struct wl_list layoutput_list;	/**< wet_layoutput::compositor_link */
};

static FILE *weston_logfile = NULL;
static struct weston_debug_scope *log_scope;
static struct weston_debug_scope *protocol_scope;

static int cached_tm_mday = -1;

static int weston_log_timestamp(void)
{
	struct timeval tv;
	struct tm *brokendown_time;
	char string[128];

	gettimeofday(&tv, NULL);

	brokendown_time = localtime(&tv.tv_sec);
	if (brokendown_time == NULL)
		return fprintf(weston_logfile, "[(NULL)localtime] ");

	if (brokendown_time->tm_mday != cached_tm_mday) {
		strftime(string, sizeof string, "%Y-%m-%d %Z", brokendown_time);
		fprintf(weston_logfile, "Date: %s\n", string);

		cached_tm_mday = brokendown_time->tm_mday;
	}

	strftime(string, sizeof string, "%H:%M:%S", brokendown_time);

	return fprintf(weston_logfile, "[%s.%03li] ", string, tv.tv_usec/1000);
}

static void
custom_handler(const char *fmt, va_list arg)
{
	char timestr[128];
	va_list arg2;

	va_copy(arg2, arg);
	weston_log_timestamp();
	fprintf(weston_logfile, "libwayland: ");
	vfprintf(weston_logfile, fmt, arg2);
	va_end(arg2);

	weston_debug_scope_printf(log_scope, "%s libwayland: ",
			weston_debug_scope_timestamp(log_scope,
			timestr, sizeof timestr));
	weston_debug_scope_vprintf(log_scope, fmt, arg);
}

static void
weston_log_file_open(const char *filename)
{
	wl_log_set_handler_server(custom_handler);

	if (filename != NULL) {
		weston_logfile = fopen(filename, "a");
		if (weston_logfile)
			os_fd_set_cloexec(fileno(weston_logfile));
	}

	if (weston_logfile == NULL)
		weston_logfile = stderr;
	else
		setvbuf(weston_logfile, NULL, _IOLBF, 256);
}

static void
weston_log_file_close(void)
{
	if ((weston_logfile != stderr) && (weston_logfile != NULL))
		fclose(weston_logfile);
	weston_logfile = stderr;
}

static int
vlog(const char *fmt, va_list ap)
{
	int l;
	char timestr[128];
	va_list ap2;

	va_copy(ap2, ap);

	if (weston_debug_scope_is_enabled(log_scope)) {
		weston_debug_scope_printf(log_scope, "%s ",
				weston_debug_scope_timestamp(log_scope,
				timestr, sizeof timestr));
		weston_debug_scope_vprintf(log_scope, fmt, ap);
	}

	l = weston_log_timestamp();
	l += vfprintf(weston_logfile, fmt, ap2);
	va_end(ap2);

	return l;
}

static int
vlog_continue(const char *fmt, va_list argp)
{
	va_list argp2;

	va_copy(argp2, argp);
	weston_debug_scope_vprintf(log_scope, fmt, argp2);
	va_end(argp2);

	return vfprintf(weston_logfile, fmt, argp);
}

static const char *
get_next_argument(const char *signature, char* type)
{
	for(; *signature; ++signature) {
		switch(*signature) {
		case 'i':
		case 'u':
		case 'f':
		case 's':
		case 'o':
		case 'n':
		case 'a':
		case 'h':
			*type = *signature;
			return signature + 1;
		}
	}
	*type = '\0';
	return signature;
}

static void
protocol_log_fn(void *user_data,
		enum wl_protocol_logger_type direction,
		const struct wl_protocol_logger_message *message)
{
	FILE *fp;
	char *logstr;
	size_t logsize;
	char timestr[128];
	struct wl_resource *res = message->resource;
	const char *signature = message->message->signature;
	int i;
	char type;

	if (!weston_debug_scope_is_enabled(protocol_scope))
		return;

	fp = open_memstream(&logstr, &logsize);
	if (!fp)
		return;

	weston_debug_scope_timestamp(protocol_scope,
			timestr, sizeof timestr);
	fprintf(fp, "%s ", timestr);
	fprintf(fp, "client %p %s ", wl_resource_get_client(res),
		direction == WL_PROTOCOL_LOGGER_REQUEST ? "rq" : "ev");
	fprintf(fp, "%s@%u.%s(",
		wl_resource_get_class(res),
		wl_resource_get_id(res),
		message->message->name);

	for (i = 0; i < message->arguments_count; i++) {
		signature = get_next_argument(signature, &type);

		if (i > 0)
			fprintf(fp, ", ");

		switch (type) {
		case 'u':
			fprintf(fp, "%u", message->arguments[i].u);
			break;
		case 'i':
			fprintf(fp, "%d", message->arguments[i].i);
			break;
		case 'f':
			fprintf(fp, "%f",
				wl_fixed_to_double(message->arguments[i].f));
			break;
		case 's':
			fprintf(fp, "\"%s\"", message->arguments[i].s);
			break;
		case 'o':
			if (message->arguments[i].o) {
				struct wl_resource* resource;
				resource = (struct wl_resource*) message->arguments[i].o;
				fprintf(fp, "%s@%u",
					wl_resource_get_class(resource),
					wl_resource_get_id(resource));
			}
			else
				fprintf(fp, "nil");
			break;
		case 'n':
			fprintf(fp, "new id %s@",
				(message->message->types[i]) ?
				message->message->types[i]->name :
				"[unknown]");
			if (message->arguments[i].n != 0)
				fprintf(fp, "%u", message->arguments[i].n);
			else
				fprintf(fp, "nil");
			break;
		case 'a':
			fprintf(fp, "array");
			break;
		case 'h':
			fprintf(fp, "fd %d", message->arguments[i].h);
			break;
		}
	}

	fprintf(fp, ")\n");

	if (fclose(fp) == 0)
		weston_debug_scope_write(protocol_scope, logstr, logsize);

	free(logstr);
}

static struct wl_list child_process_list;
static struct weston_compositor *segv_compositor;

static int
sigchld_handler(int signal_number, void *data)
{
	struct weston_process *p;
	int status;
	pid_t pid;

	while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
		wl_list_for_each(p, &child_process_list, link) {
			if (p->pid == pid)
				break;
		}

		if (&p->link == &child_process_list) {
			weston_log("unknown child process exited\n");
			continue;
		}

		wl_list_remove(&p->link);
		p->cleanup(p, status);
	}

	if (pid < 0 && errno != ECHILD)
		weston_log("waitpid error %m\n");

	return 1;
}

static void
child_client_exec(int sockfd, const char *path)
{
	int clientfd;
	char s[32];
	sigset_t allsigs;

	/* do not give our signal mask to the new process */
	sigfillset(&allsigs);
	sigprocmask(SIG_UNBLOCK, &allsigs, NULL);

	/* Launch clients as the user. Do not lauch clients with wrong euid.*/
	if (seteuid(getuid()) == -1) {
		weston_log("compositor: failed seteuid\n");
		return;
	}

	/* SOCK_CLOEXEC closes both ends, so we dup the fd to get a
	 * non-CLOEXEC fd to pass through exec. */
	clientfd = dup(sockfd);
	if (clientfd == -1) {
		weston_log("compositor: dup failed: %m\n");
		return;
	}

	snprintf(s, sizeof s, "%d", clientfd);
	setenv("WAYLAND_SOCKET", s, 1);

	if (execl(path, path, NULL) < 0)
		weston_log("compositor: executing '%s' failed: %m\n",
			path);
}

WL_EXPORT struct wl_client *
weston_client_launch(struct weston_compositor *compositor,
		     struct weston_process *proc,
		     const char *path,
		     weston_process_cleanup_func_t cleanup)
{
	int sv[2];
	pid_t pid;
	struct wl_client *client;

	weston_log("launching '%s'\n", path);

	if (os_socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, sv) < 0) {
		weston_log("weston_client_launch: "
			"socketpair failed while launching '%s': %m\n",
			path);
		return NULL;
	}

	pid = fork();
	if (pid == -1) {
		close(sv[0]);
		close(sv[1]);
		weston_log("weston_client_launch: "
			"fork failed while launching '%s': %m\n", path);
		return NULL;
	}

	if (pid == 0) {
		child_client_exec(sv[1], path);
		_exit(-1);
	}

	close(sv[1]);

	client = wl_client_create(compositor->wl_display, sv[0]);
	if (!client) {
		close(sv[0]);
		weston_log("weston_client_launch: "
			"wl_client_create failed while launching '%s'.\n",
			path);
		return NULL;
	}

	proc->pid = pid;
	proc->cleanup = cleanup;
	weston_watch_process(proc);

	return client;
}

WL_EXPORT void
weston_watch_process(struct weston_process *process)
{
	wl_list_insert(&child_process_list, &process->link);
}

struct process_info {
	struct weston_process proc;
	char *path;
};

static void
process_handle_sigchld(struct weston_process *process, int status)
{
	struct process_info *pinfo =
		container_of(process, struct process_info, proc);

	/*
	 * There are no guarantees whether this runs before or after
	 * the wl_client destructor.
	 */

	if (WIFEXITED(status)) {
		weston_log("%s exited with status %d\n", pinfo->path,
			   WEXITSTATUS(status));
	} else if (WIFSIGNALED(status)) {
		weston_log("%s died on signal %d\n", pinfo->path,
			   WTERMSIG(status));
	} else {
		weston_log("%s disappeared\n", pinfo->path);
	}

	free(pinfo->path);
	free(pinfo);
}

WL_EXPORT struct wl_client *
weston_client_start(struct weston_compositor *compositor, const char *path)
{
	struct process_info *pinfo;
	struct wl_client *client;

	pinfo = zalloc(sizeof *pinfo);
	if (!pinfo)
		return NULL;

	pinfo->path = strdup(path);
	if (!pinfo->path)
		goto out_free;

	client = weston_client_launch(compositor, &pinfo->proc, path,
				      process_handle_sigchld);
	if (!client)
		goto out_str;

	return client;

out_str:
	free(pinfo->path);

out_free:
	free(pinfo);

	return NULL;
}

static void
log_uname(void)
{
	struct utsname usys;

	uname(&usys);

	weston_log("OS: %s, %s, %s, %s\n", usys.sysname, usys.release,
						usys.version, usys.machine);
}

static struct wet_compositor *
to_wet_compositor(struct weston_compositor *compositor)
{
	return weston_compositor_get_user_data(compositor);
}

static struct wet_output_config *
wet_init_parsed_options(struct weston_compositor *ec)
{
	struct wet_compositor *compositor = to_wet_compositor(ec);
	struct wet_output_config *config;

	config = zalloc(sizeof *config);

	if (!config) {
		perror("out of memory");
		return NULL;
	}

	config->width = 0;
	config->height = 0;
	config->scale = 0;
	config->transform = UINT32_MAX;

	compositor->parsed_options = config;

	return config;
}

WL_EXPORT struct weston_config *
wet_get_config(struct weston_compositor *ec)
{
	struct wet_compositor *compositor = to_wet_compositor(ec);

	return compositor->config;
}

static const char xdg_error_message[] =
	"fatal: environment variable XDG_RUNTIME_DIR is not set.\n";

static const char xdg_wrong_message[] =
	"fatal: environment variable XDG_RUNTIME_DIR\n"
	"is set to \"%s\", which is not a directory.\n";

static const char xdg_wrong_mode_message[] =
	"warning: XDG_RUNTIME_DIR \"%s\" is not configured\n"
	"correctly.  Unix access mode must be 0700 (current mode is %o),\n"
	"and must be owned by the user (current owner is UID %d).\n";

static const char xdg_detail_message[] =
	"Refer to your distribution on how to get it, or\n"
	"http://www.freedesktop.org/wiki/Specifications/basedir-spec\n"
	"on how to implement it.\n";

static void
verify_xdg_runtime_dir(void)
{
	char *dir = getenv("XDG_RUNTIME_DIR");
	struct stat s;

	if (!dir) {
		weston_log(xdg_error_message);
		weston_log_continue(xdg_detail_message);
		exit(EXIT_FAILURE);
	}

	if (stat(dir, &s) || !S_ISDIR(s.st_mode)) {
		weston_log(xdg_wrong_message, dir);
		weston_log_continue(xdg_detail_message);
		exit(EXIT_FAILURE);
	}

	if ((s.st_mode & 0777) != 0700 || s.st_uid != getuid()) {
		weston_log(xdg_wrong_mode_message,
			   dir, s.st_mode & 0777, s.st_uid);
		weston_log_continue(xdg_detail_message);
	}
}

static int
usage(int error_code)
{
	FILE *out = error_code == EXIT_SUCCESS ? stdout : stderr;

	fprintf(out,
		"Usage: weston [OPTIONS]\n\n"
		"This is weston version " VERSION ", the Wayland reference compositor.\n"
		"Weston supports multiple backends, and depending on which backend is in use\n"
		"different options will be accepted.\n\n"


		"Core options:\n\n"
		"  --version\t\tPrint weston version\n"
		"  -B, --backend=MODULE\tBackend module, one of\n"
#if defined(BUILD_DRM_COMPOSITOR)
			"\t\t\t\tdrm-backend.so\n"
#endif
#if defined(BUILD_FBDEV_COMPOSITOR)
			"\t\t\t\tfbdev-backend.so\n"
#endif
#if defined(BUILD_HEADLESS_COMPOSITOR)
			"\t\t\t\theadless-backend.so\n"
#endif
#if defined(BUILD_RDP_COMPOSITOR)
			"\t\t\t\trdp-backend.so\n"
#endif
#if defined(BUILD_WAYLAND_COMPOSITOR)
			"\t\t\t\twayland-backend.so\n"
#endif
#if defined(BUILD_X11_COMPOSITOR)
			"\t\t\t\tx11-backend.so\n"
#endif
		"  --shell=MODULE\tShell module, defaults to desktop-shell.so\n"
		"  -S, --socket=NAME\tName of socket to listen on\n"
		"  -i, --idle-time=SECS\tIdle time in seconds\n"
#if defined(BUILD_XWAYLAND)
		"  --xwayland\t\tLoad the xwayland module\n"
#endif
		"  --modules\t\tLoad the comma-separated list of modules\n"
		"  --log=FILE\t\tLog to the given file\n"
		"  -c, --config=FILE\tConfig file to load, defaults to weston.ini\n"
		"  --no-config\t\tDo not read weston.ini\n"
		"  --wait-for-debugger\tRaise SIGSTOP on start-up\n"
		"  --debug\t\tEnable debug extension\n"
		"  -h, --help\t\tThis help message\n\n");

#if defined(BUILD_DRM_COMPOSITOR)
	fprintf(out,
		"Options for drm-backend.so:\n\n"
		"  --seat=SEAT\t\tThe seat that weston should run on, instead of the seat defined in XDG_SEAT\n"
		"  --tty=TTY\t\tThe tty to use\n"
		"  --drm-device=CARD\tThe DRM device to use, e.g. \"card0\".\n"
		"  --use-pixman\t\tUse the pixman (CPU) renderer\n"
		"  --current-mode\tPrefer current KMS mode over EDID preferred mode\n\n");
#endif

#if defined(BUILD_FBDEV_COMPOSITOR)
	fprintf(out,
		"Options for fbdev-backend.so:\n\n"
		"  --tty=TTY\t\tThe tty to use\n"
		"  --device=DEVICE\tThe framebuffer device to use\n"
		"  --seat=SEAT\t\tThe seat that weston should run on, instead of the seat defined in XDG_SEAT\n"
		"\n");
#endif

#if defined(BUILD_HEADLESS_COMPOSITOR)
	fprintf(out,
		"Options for headless-backend.so:\n\n"
		"  --width=WIDTH\t\tWidth of memory surface\n"
		"  --height=HEIGHT\tHeight of memory surface\n"
		"  --transform=TR\tThe output transformation, TR is one of:\n"
		"\tnormal 90 180 270 flipped flipped-90 flipped-180 flipped-270\n"
		"  --use-pixman\t\tUse the pixman (CPU) renderer (default: no rendering)\n"
		"  --no-outputs\t\tDo not create any virtual outputs\n"
		"\n");
#endif

#if defined(BUILD_RDP_COMPOSITOR)
	fprintf(out,
		"Options for rdp-backend.so:\n\n"
		"  --width=WIDTH\t\tWidth of desktop\n"
		"  --height=HEIGHT\tHeight of desktop\n"
		"  --env-socket\t\tUse socket defined in RDP_FD env variable as peer connection\n"
		"  --address=ADDR\tThe address to bind\n"
		"  --port=PORT\t\tThe port to listen on\n"
		"  --no-clients-resize\tThe RDP peers will be forced to the size of the desktop\n"
		"  --rdp4-key=FILE\tThe file containing the key for RDP4 encryption\n"
		"  --rdp-tls-cert=FILE\tThe file containing the certificate for TLS encryption\n"
		"  --rdp-tls-key=FILE\tThe file containing the private key for TLS encryption\n"
		"\n");
#endif

#if defined(BUILD_WAYLAND_COMPOSITOR)
	fprintf(out,
		"Options for wayland-backend.so:\n\n"
		"  --width=WIDTH\t\tWidth of Wayland surface\n"
		"  --height=HEIGHT\tHeight of Wayland surface\n"
		"  --scale=SCALE\t\tScale factor of output\n"
		"  --fullscreen\t\tRun in fullscreen mode\n"
		"  --use-pixman\t\tUse the pixman (CPU) renderer\n"
		"  --output-count=COUNT\tCreate multiple outputs\n"
		"  --sprawl\t\tCreate one fullscreen output for every parent output\n"
		"  --display=DISPLAY\tWayland display to connect to\n\n");
#endif

#if defined(BUILD_X11_COMPOSITOR)
	fprintf(out,
		"Options for x11-backend.so:\n\n"
		"  --width=WIDTH\t\tWidth of X window\n"
		"  --height=HEIGHT\tHeight of X window\n"
		"  --scale=SCALE\t\tScale factor of output\n"
		"  --fullscreen\t\tRun in fullscreen mode\n"
		"  --use-pixman\t\tUse the pixman (CPU) renderer\n"
		"  --output-count=COUNT\tCreate multiple outputs\n"
		"  --no-input\t\tDont create input devices\n\n");
#endif

	exit(error_code);
}

static int on_term_signal(int signal_number, void *data)
{
	struct wl_display *display = data;

	weston_log("caught signal %d\n", signal_number);
	wl_display_terminate(display);

	return 1;
}

static const char *
clock_name(clockid_t clk_id)
{
	static const char *names[] = {
		[CLOCK_REALTIME] =		"CLOCK_REALTIME",
		[CLOCK_MONOTONIC] =		"CLOCK_MONOTONIC",
		[CLOCK_MONOTONIC_RAW] =		"CLOCK_MONOTONIC_RAW",
		[CLOCK_REALTIME_COARSE] =	"CLOCK_REALTIME_COARSE",
		[CLOCK_MONOTONIC_COARSE] =	"CLOCK_MONOTONIC_COARSE",
#ifdef CLOCK_BOOTTIME
		[CLOCK_BOOTTIME] =		"CLOCK_BOOTTIME",
#endif
	};

	if (clk_id < 0 || (unsigned)clk_id >= ARRAY_LENGTH(names))
		return "unknown";

	return names[clk_id];
}

static const struct {
	uint32_t bit; /* enum weston_capability */
	const char *desc;
} capability_strings[] = {
	{ WESTON_CAP_ROTATION_ANY, "arbitrary surface rotation:" },
	{ WESTON_CAP_CAPTURE_YFLIP, "screen capture uses y-flip:" },
};

static void
weston_compositor_log_capabilities(struct weston_compositor *compositor)
{
	unsigned i;
	int yes;
	struct timespec res;

	weston_log("Compositor capabilities:\n");
	for (i = 0; i < ARRAY_LENGTH(capability_strings); i++) {
		yes = compositor->capabilities & capability_strings[i].bit;
		weston_log_continue(STAMP_SPACE "%s %s\n",
				    capability_strings[i].desc,
				    yes ? "yes" : "no");
	}

	weston_log_continue(STAMP_SPACE "presentation clock: %s, id %d\n",
			    clock_name(compositor->presentation_clock),
			    compositor->presentation_clock);

	if (clock_getres(compositor->presentation_clock, &res) == 0)
		weston_log_continue(STAMP_SPACE
				"presentation clock resolution: %d.%09ld s\n",
				(int)res.tv_sec, res.tv_nsec);
	else
		weston_log_continue(STAMP_SPACE
				"presentation clock resolution: N/A\n");
}

static void
handle_primary_client_destroyed(struct wl_listener *listener, void *data)
{
	struct wl_client *client = data;

	weston_log("Primary client died.  Closing...\n");

	wl_display_terminate(wl_client_get_display(client));
}

static int
weston_create_listening_socket(struct wl_display *display, const char *socket_name)
{
	if (socket_name) {
		if (wl_display_add_socket(display, socket_name)) {
			weston_log("fatal: failed to add socket: %m\n");
			return -1;
		}
	} else {
		socket_name = wl_display_add_socket_auto(display);
		if (!socket_name) {
			weston_log("fatal: failed to add socket: %m\n");
			return -1;
		}
	}

	setenv("WAYLAND_DISPLAY", socket_name, 1);

	return 0;
}

WL_EXPORT void *
wet_load_module_entrypoint(const char *name, const char *entrypoint)
{
	char path[PATH_MAX];
	void *module, *init;
	size_t len;

	if (name == NULL)
		return NULL;

	if (name[0] != '/') {
		len = weston_module_path_from_env(name, path, sizeof path);
		if (len == 0)
			len = snprintf(path, sizeof path, "%s/%s", MODULEDIR,
				       name);
	} else {
		len = snprintf(path, sizeof path, "%s", name);
	}

	/* snprintf returns the length of the string it would've written,
	 * _excluding_ the NUL byte. So even being equal to the size of
	 * our buffer is an error here. */
	if (len >= sizeof path)
		return NULL;

	module = dlopen(path, RTLD_NOW | RTLD_NOLOAD);
	if (module) {
		weston_log("Module '%s' already loaded\n", path);
		dlclose(module);
		return NULL;
	}

	weston_log("Loading module '%s'\n", path);
	module = dlopen(path, RTLD_NOW);
	if (!module) {
		weston_log("Failed to load module: %s\n", dlerror());
		return NULL;
	}

	init = dlsym(module, entrypoint);
	if (!init) {
		weston_log("Failed to lookup init function: %s\n", dlerror());
		dlclose(module);
		return NULL;
	}

	return init;
}

WL_EXPORT int
wet_load_module(struct weston_compositor *compositor,
	        const char *name, int *argc, char *argv[])
{
	int (*module_init)(struct weston_compositor *ec,
			   int *argc, char *argv[]);

	module_init = wet_load_module_entrypoint(name, "wet_module_init");
	if (!module_init)
		return -1;
	if (module_init(compositor, argc, argv) < 0)
		return -1;
	return 0;
}

static int
wet_load_shell(struct weston_compositor *compositor,
	       const char *name, int *argc, char *argv[])
{
	int (*shell_init)(struct weston_compositor *ec,
			  int *argc, char *argv[]);

	shell_init = wet_load_module_entrypoint(name, "wet_shell_init");
	if (!shell_init)
		return -1;
	if (shell_init(compositor, argc, argv) < 0)
		return -1;
	return 0;
}

static char *
wet_get_binary_path(const char *name, const char *dir)
{
	char path[PATH_MAX];
	size_t len;

	len = weston_module_path_from_env(name, path, sizeof path);
	if (len > 0)
		return strdup(path);

	len = snprintf(path, sizeof path, "%s/%s", dir, name);
	if (len >= sizeof path)
		return NULL;

	return strdup(path);
}

WL_EXPORT char *
wet_get_libexec_path(const char *name)
{
	return wet_get_binary_path(name, LIBEXECDIR);
}

WL_EXPORT char *
wet_get_bindir_path(const char *name)
{
	return wet_get_binary_path(name, BINDIR);
}

static int
load_modules(struct weston_compositor *ec, const char *modules,
	     int *argc, char *argv[], int32_t *xwayland)
{
	const char *p, *end;
	char buffer[256];

	if (modules == NULL)
		return 0;

	p = modules;
	while (*p) {
		end = strchrnul(p, ',');
		snprintf(buffer, sizeof buffer, "%.*s", (int) (end - p), p);

		if (strstr(buffer, "xwayland.so")) {
			weston_log("Old Xwayland module loading detected: "
				   "Please use --xwayland command line option "
				   "or set xwayland=true in the [core] section "
				   "in weston.ini\n");
			*xwayland = 1;
		} else {
			if (wet_load_module(ec, buffer, argc, argv) < 0)
				return -1;
		}

		p = end;
		while (*p == ',')
			p++;
	}

	return 0;
}

static int
save_touch_device_calibration(struct weston_compositor *compositor,
			      struct weston_touch_device *device,
			      const struct weston_touch_device_matrix *calibration)
{
	struct weston_config_section *s;
	struct weston_config *config = wet_get_config(compositor);
	char *helper = NULL;
	char *helper_cmd = NULL;
	int ret = -1;
	int status;
	const float *m = calibration->m;

	s = weston_config_get_section(config,
				      "libinput", NULL, NULL);

	weston_config_section_get_string(s, "calibration_helper",
					 &helper, NULL);

	if (!helper || strlen(helper) == 0) {
		ret = 0;
		goto out;
	}

	if (asprintf(&helper_cmd, "\"%s\" '%s' %f %f %f %f %f %f",
		     helper, device->syspath,
		     m[0], m[1], m[2],
		     m[3], m[4], m[5]) < 0)
		goto out;

	status = system(helper_cmd);
	free(helper_cmd);

	if (status < 0) {
		weston_log("Error: failed to run calibration helper '%s'.\n",
			   helper);
		goto out;
	}

	if (!WIFEXITED(status)) {
		weston_log("Error: calibration helper '%s' possibly killed.\n",
			   helper);
		goto out;
	}

	if (WEXITSTATUS(status) == 0) {
		ret = 0;
	} else {
		weston_log("Calibration helper '%s' exited with status %d.\n",
			   helper, WEXITSTATUS(status));
	}

out:
	free(helper);

	return ret;
}

static int
weston_compositor_init_config(struct weston_compositor *ec,
			      struct weston_config *config)
{
	struct xkb_rule_names xkb_names;
	struct weston_config_section *s;
	int repaint_msec;
	int vt_switching;
	int cal;

	/* weston.ini [keyboard] */
	s = weston_config_get_section(config, "keyboard", NULL, NULL);
	weston_config_section_get_string(s, "keymap_rules",
					 (char **) &xkb_names.rules, NULL);
	weston_config_section_get_string(s, "keymap_model",
					 (char **) &xkb_names.model, NULL);
	weston_config_section_get_string(s, "keymap_layout",
					 (char **) &xkb_names.layout, NULL);
	weston_config_section_get_string(s, "keymap_variant",
					 (char **) &xkb_names.variant, NULL);
	weston_config_section_get_string(s, "keymap_options",
					 (char **) &xkb_names.options, NULL);

	if (weston_compositor_set_xkb_rule_names(ec, &xkb_names) < 0)
		return -1;

	weston_config_section_get_int(s, "repeat-rate",
				      &ec->kb_repeat_rate, 40);
	weston_config_section_get_int(s, "repeat-delay",
				      &ec->kb_repeat_delay, 400);

	weston_config_section_get_bool(s, "vt-switching",
				       &vt_switching, true);
	ec->vt_switching = vt_switching;

	/* weston.ini [core] */
	s = weston_config_get_section(config, "core", NULL, NULL);
	weston_config_section_get_int(s, "repaint-window", &repaint_msec,
				      ec->repaint_msec);
	if (repaint_msec < -10 || repaint_msec > 1000) {
		weston_log("Invalid repaint_window value in config: %d\n",
			   repaint_msec);
	} else {
		ec->repaint_msec = repaint_msec;
	}
	weston_log("Output repaint window is %d ms maximum.\n",
		   ec->repaint_msec);

	/* weston.ini [libinput] */
	s = weston_config_get_section(config, "libinput", NULL, NULL);
	weston_config_section_get_bool(s, "touchscreen_calibrator", &cal, 0);
	if (cal)
		weston_compositor_enable_touch_calibrator(ec,
						save_touch_device_calibration);

	return 0;
}

static char *
weston_choose_default_backend(void)
{
	char *backend = NULL;

	if (getenv("WAYLAND_DISPLAY") || getenv("WAYLAND_SOCKET"))
		backend = strdup("wayland-backend.so");
	else if (getenv("DISPLAY"))
		backend = strdup("x11-backend.so");
	else
		backend = strdup(WESTON_NATIVE_BACKEND);

	return backend;
}

static const struct { const char *name; uint32_t token; } transforms[] = {
	{ "normal",     WL_OUTPUT_TRANSFORM_NORMAL },
	{ "90",         WL_OUTPUT_TRANSFORM_90 },
	{ "180",        WL_OUTPUT_TRANSFORM_180 },
	{ "270",        WL_OUTPUT_TRANSFORM_270 },
	{ "flipped",    WL_OUTPUT_TRANSFORM_FLIPPED },
	{ "flipped-90", WL_OUTPUT_TRANSFORM_FLIPPED_90 },
	{ "flipped-180", WL_OUTPUT_TRANSFORM_FLIPPED_180 },
	{ "flipped-270", WL_OUTPUT_TRANSFORM_FLIPPED_270 },
};

WL_EXPORT int
weston_parse_transform(const char *transform, uint32_t *out)
{
	unsigned int i;

	for (i = 0; i < ARRAY_LENGTH(transforms); i++)
		if (strcmp(transforms[i].name, transform) == 0) {
			*out = transforms[i].token;
			return 0;
		}

	*out = WL_OUTPUT_TRANSFORM_NORMAL;
	return -1;
}

WL_EXPORT const char *
weston_transform_to_string(uint32_t output_transform)
{
	unsigned int i;

	for (i = 0; i < ARRAY_LENGTH(transforms); i++)
		if (transforms[i].token == output_transform)
			return transforms[i].name;

	return "<illegal value>";
}

static int
load_configuration(struct weston_config **config, int32_t noconfig,
		   const char *config_file)
{
	const char *file = "weston.ini";
	const char *full_path;

	*config = NULL;

	if (config_file)
		file = config_file;

	if (noconfig == 0)
		*config = weston_config_parse(file);

	if (*config) {
		full_path = weston_config_get_full_path(*config);

		weston_log("Using config file '%s'\n", full_path);
		setenv(WESTON_CONFIG_FILE_ENV_VAR, full_path, 1);

		return 0;
	}

	if (config_file && noconfig == 0) {
		weston_log("fatal: error opening or reading config file"
			   " '%s'.\n", config_file);

		return -1;
	}

	weston_log("Starting with no config file.\n");
	setenv(WESTON_CONFIG_FILE_ENV_VAR, "", 1);

	return 0;
}

static void
handle_exit(struct weston_compositor *c)
{
	wl_display_terminate(c->wl_display);
}

static void
wet_output_set_scale(struct weston_output *output,
		     struct weston_config_section *section,
		     int32_t default_scale,
		     int32_t parsed_scale)
{
	int32_t scale = default_scale;

	if (section)
		weston_config_section_get_int(section, "scale", &scale, default_scale);

	if (parsed_scale)
		scale = parsed_scale;

	weston_output_set_scale(output, scale);
}

/* UINT32_MAX is treated as invalid because 0 is a valid
 * enumeration value and the parameter is unsigned
 */
static void
wet_output_set_transform(struct weston_output *output,
			 struct weston_config_section *section,
			 uint32_t default_transform,
			 uint32_t parsed_transform)
{
	char *t;
	uint32_t transform = default_transform;

	if (section) {
		weston_config_section_get_string(section,
						 "transform", &t, "normal");

		if (weston_parse_transform(t, &transform) < 0) {
			weston_log("Invalid transform \"%s\" for output %s\n",
				   t, output->name);
			transform = default_transform;
		}
		free(t);
	}

	if (parsed_transform != UINT32_MAX)
		transform = parsed_transform;

	weston_output_set_transform(output, transform);
}

static int
wet_configure_windowed_output_from_config(struct weston_output *output,
					  struct wet_output_config *defaults)
{
	const struct weston_windowed_output_api *api =
		weston_windowed_output_get_api(output->compositor);

	struct weston_config *wc = wet_get_config(output->compositor);
	struct weston_config_section *section = NULL;
	struct wet_compositor *compositor = to_wet_compositor(output->compositor);
	struct wet_output_config *parsed_options = compositor->parsed_options;
	int width = defaults->width;
	int height = defaults->height;

	assert(parsed_options);

	if (!api) {
		weston_log("Cannot use weston_windowed_output_api.\n");
		return -1;
	}

	section = weston_config_get_section(wc, "output", "name", output->name);

	if (section) {
		char *mode;

		weston_config_section_get_string(section, "mode", &mode, NULL);
		if (!mode || sscanf(mode, "%dx%d", &width,
				    &height) != 2) {
			weston_log("Invalid mode for output %s. Using defaults.\n",
				   output->name);
			width = defaults->width;
			height = defaults->height;
		}
		free(mode);
	}

	if (parsed_options->width)
		width = parsed_options->width;

	if (parsed_options->height)
		height = parsed_options->height;

	wet_output_set_scale(output, section, defaults->scale, parsed_options->scale);
	wet_output_set_transform(output, section, defaults->transform, parsed_options->transform);

	if (api->output_set_size(output, width, height) < 0) {
		weston_log("Cannot configure output \"%s\" using weston_windowed_output_api.\n",
			   output->name);
		return -1;
	}

	return 0;
}

static int
count_remaining_heads(struct weston_output *output, struct weston_head *to_go)
{
	struct weston_head *iter = NULL;
	int n = 0;

	while ((iter = weston_output_iterate_heads(output, iter))) {
		if (iter != to_go)
			n++;
	}

	return n;
}

static void
wet_head_tracker_destroy(struct wet_head_tracker *track)
{
	wl_list_remove(&track->head_destroy_listener.link);
	free(track);
}

static void
handle_head_destroy(struct wl_listener *listener, void *data)
{
	struct weston_head *head = data;
	struct weston_output *output;
	struct wet_head_tracker *track =
		container_of(listener, struct wet_head_tracker,
			     head_destroy_listener);

	wet_head_tracker_destroy(track);

	output = weston_head_get_output(head);

	/* On shutdown path, the output might be already gone. */
	if (!output)
		return;

	if (count_remaining_heads(output, head) > 0)
		return;

	weston_output_destroy(output);
}

static struct wet_head_tracker *
wet_head_tracker_from_head(struct weston_head *head)
{
	struct wl_listener *lis;

	lis = weston_head_get_destroy_listener(head, handle_head_destroy);
	if (!lis)
		return NULL;

	return container_of(lis, struct wet_head_tracker,
			    head_destroy_listener);
}

/* Listen for head destroy signal.
 *
 * If a head is destroyed and it was the last head on the output, we
 * destroy the associated output.
 *
 * Do not bother destroying the head trackers on shutdown, the backend will
 * destroy the heads which calls our handler to destroy the trackers.
 */
static void
wet_head_tracker_create(struct wet_compositor *compositor,
			struct weston_head *head)
{
	struct wet_head_tracker *track;

	track = zalloc(sizeof *track);
	if (!track)
		return;

	track->head_destroy_listener.notify = handle_head_destroy;
	weston_head_add_destroy_listener(head, &track->head_destroy_listener);
}

static void
simple_head_enable(struct wet_compositor *wet, struct weston_head *head)
{
	struct weston_output *output;
	int ret = 0;

	output = weston_compositor_create_output_with_head(wet->compositor,
							   head);
	if (!output) {
		weston_log("Could not create an output for head \"%s\".\n",
			   weston_head_get_name(head));
		wet->init_failed = true;

		return;
	}

	if (wet->simple_output_configure)
		ret = wet->simple_output_configure(output);
	if (ret < 0) {
		weston_log("Cannot configure output \"%s\".\n",
			   weston_head_get_name(head));
		weston_output_destroy(output);
		wet->init_failed = true;

		return;
	}

	if (weston_output_enable(output) < 0) {
		weston_log("Enabling output \"%s\" failed.\n",
			   weston_head_get_name(head));
		weston_output_destroy(output);
		wet->init_failed = true;

		return;
	}

	wet_head_tracker_create(wet, head);

	/* The weston_compositor will track and destroy the output on exit. */
}

static void
simple_head_disable(struct weston_head *head)
{
	struct weston_output *output;
	struct wet_head_tracker *track;

	track = wet_head_tracker_from_head(head);
	if (track)
		wet_head_tracker_destroy(track);

	output = weston_head_get_output(head);
	assert(output);
	weston_output_destroy(output);
}

static void
simple_heads_changed(struct wl_listener *listener, void *arg)
{
	struct weston_compositor *compositor = arg;
	struct wet_compositor *wet = to_wet_compositor(compositor);
	struct weston_head *head = NULL;
	bool connected;
	bool enabled;
	bool changed;
	bool non_desktop;

	while ((head = weston_compositor_iterate_heads(wet->compositor, head))) {
		connected = weston_head_is_connected(head);
		enabled = weston_head_is_enabled(head);
		changed = weston_head_is_device_changed(head);
		non_desktop = weston_head_is_non_desktop(head);

		if (connected && !enabled && !non_desktop) {
			simple_head_enable(wet, head);
		} else if (!connected && enabled) {
			simple_head_disable(head);
		} else if (enabled && changed) {
			weston_log("Detected a monitor change on head '%s', "
				   "not bothering to do anything about it.\n",
				   weston_head_get_name(head));
		}
		weston_head_reset_device_changed(head);
	}
}

static void
wet_set_simple_head_configurator(struct weston_compositor *compositor,
				 int (*fn)(struct weston_output *))
{
	struct wet_compositor *wet = to_wet_compositor(compositor);

	wet->simple_output_configure = fn;

	wet->heads_changed_listener.notify = simple_heads_changed;
	weston_compositor_add_heads_changed_listener(compositor,
						&wet->heads_changed_listener);
}

static void
configure_input_device_accel(struct weston_config_section *s,
		struct libinput_device *device)
{
	char *profile_string = NULL;
	int is_a_profile = 1;
	uint32_t profiles;
	enum libinput_config_accel_profile profile;
	double speed;

	if (weston_config_section_get_string(s, "accel-profile",
					     &profile_string, NULL) == 0) {
		if (strcmp(profile_string, "flat") == 0)
			profile = LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT;
		else if (strcmp(profile_string, "adaptive") == 0)
			profile = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE;
		else {
			weston_log("warning: no such accel-profile: %s\n",
				   profile_string);
			is_a_profile = 0;
		}

		profiles = libinput_device_config_accel_get_profiles(device);
		if (is_a_profile && (profile & profiles) != 0) {
			weston_log("          accel-profile=%s\n",
				   profile_string);
			libinput_device_config_accel_set_profile(device,
					profile);
		}
	}

	if (weston_config_section_get_double(s, "accel-speed",
					     &speed, 0) == 0 &&
	    speed >= -1. && speed <= 1.) {
		weston_log("          accel-speed=%.3f\n", speed);
		libinput_device_config_accel_set_speed(device, speed);
	}

	free(profile_string);
}

static void
configure_input_device_scroll(struct weston_config_section *s,
		struct libinput_device *device)
{
	int natural;
	char *method_string = NULL;
	uint32_t methods;
	enum libinput_config_scroll_method method;
	char *button_string = NULL;
	int button;

	if (libinput_device_config_scroll_has_natural_scroll(device) &&
	    weston_config_section_get_bool(s, "natural-scroll",
					   &natural, 0) == 0) {
		weston_log("          natural-scroll=%s\n",
			   natural ? "true" : "false");
		libinput_device_config_scroll_set_natural_scroll_enabled(
				device, natural);
	}

	if (weston_config_section_get_string(s, "scroll-method",
					     &method_string, NULL) != 0)
		goto done;
	if (strcmp(method_string, "two-finger") == 0)
		method = LIBINPUT_CONFIG_SCROLL_2FG;
	else if (strcmp(method_string, "edge") == 0)
		method = LIBINPUT_CONFIG_SCROLL_EDGE;
	else if (strcmp(method_string, "button") == 0)
		method = LIBINPUT_CONFIG_SCROLL_ON_BUTTON_DOWN;
	else if (strcmp(method_string, "none") == 0)
		method = LIBINPUT_CONFIG_SCROLL_NO_SCROLL;
	else {
		weston_log("warning: no such scroll-method: %s\n",
			   method_string);
		goto done;
	}

	methods = libinput_device_config_scroll_get_methods(device);
	if (method != LIBINPUT_CONFIG_SCROLL_NO_SCROLL &&
	    (method & methods) == 0)
		goto done;

	weston_log("          scroll-method=%s\n", method_string);
	libinput_device_config_scroll_set_method(device, method);

	if (method == LIBINPUT_CONFIG_SCROLL_ON_BUTTON_DOWN) {
		if (weston_config_section_get_string(s, "scroll-button",
						     &button_string,
						     NULL) != 0)
			goto done;

		button = libevdev_event_code_from_name(EV_KEY, button_string);
		if (button == -1) {
			weston_log("          Bad scroll-button: %s\n",
				   button_string);
			goto done;
		}

		weston_log("          scroll-button=%s\n", button_string);
		libinput_device_config_scroll_set_button(device, button);
	}

done:
	free(method_string);
	free(button_string);
}

static void
configure_input_device(struct weston_compositor *compositor,
		       struct libinput_device *device)
{
	struct weston_config_section *s;
	struct weston_config *config = wet_get_config(compositor);
	int has_enable_tap = 0;
	int enable_tap;
	int disable_while_typing;
	int middle_emulation;
	int tap_and_drag;
	int tap_and_drag_lock;
	int left_handed;
	unsigned int rotation;

	weston_log("libinput: configuring device \"%s\".\n",
		   libinput_device_get_name(device));

	s = weston_config_get_section(config,
				      "libinput", NULL, NULL);

	if (libinput_device_config_tap_get_finger_count(device) > 0) {
		if (weston_config_section_get_bool(s, "enable_tap",
						   &enable_tap, 0) == 0) {
			weston_log("!!DEPRECATION WARNING!!: In weston.ini, "
				   "enable_tap is deprecated in favour of "
				   "enable-tap. Support for it may be removed "
				   "at any time!");
			has_enable_tap = 1;
		}
		if (weston_config_section_get_bool(s, "enable-tap",
						   &enable_tap, 0) == 0)
			has_enable_tap = 1;
		if (has_enable_tap) {
			weston_log("          enable-tap=%s.\n",
				   enable_tap ? "true" : "false");
			libinput_device_config_tap_set_enabled(device,
							       enable_tap);
		}
		if (weston_config_section_get_bool(s, "tap-and-drag",
						   &tap_and_drag, 0) == 0) {
			weston_log("          tap-and-drag=%s.\n",
				   tap_and_drag ? "true" : "false");
			libinput_device_config_tap_set_drag_enabled(device,
					tap_and_drag);
		}
		if (weston_config_section_get_bool(s, "tap-and-drag-lock",
					       &tap_and_drag_lock, 0) == 0) {
			weston_log("          tap-and-drag-lock=%s.\n",
				   tap_and_drag_lock ? "true" : "false");
			libinput_device_config_tap_set_drag_lock_enabled(
					device, tap_and_drag_lock);
		}
	}

	if (libinput_device_config_dwt_is_available(device) &&
	    weston_config_section_get_bool(s, "disable-while-typing",
					   &disable_while_typing, 0) == 0) {
		weston_log("          disable-while-typing=%s.\n",
			   disable_while_typing ? "true" : "false");
		libinput_device_config_dwt_set_enabled(device,
						       disable_while_typing);
	}

	if (libinput_device_config_middle_emulation_is_available(device) &&
	    weston_config_section_get_bool(s, "middle-button-emulation",
					   &middle_emulation, 0) == 0) {
		weston_log("          middle-button-emulation=%s\n",
			   middle_emulation ? "true" : "false");
		libinput_device_config_middle_emulation_set_enabled(
				device, middle_emulation);
	}

	if (libinput_device_config_left_handed_is_available(device) &&
	    weston_config_section_get_bool(s, "left-handed",
				           &left_handed, 0) == 0) {
		weston_log("          left-handed=%s\n",
			   left_handed ? "true" : "false");
		libinput_device_config_left_handed_set(device, left_handed);
	}

	if (libinput_device_config_rotation_is_available(device) &&
	    weston_config_section_get_uint(s, "rotation",
				           &rotation, 0) == 0) {
		weston_log("          rotation=%u\n", rotation);
		libinput_device_config_rotation_set_angle(device, rotation);
	}

	if (libinput_device_config_accel_is_available(device))
		configure_input_device_accel(s, device);

	configure_input_device_scroll(s, device);
}

static int
drm_backend_output_configure(struct weston_output *output,
			     struct weston_config_section *section)
{
	struct wet_compositor *wet = to_wet_compositor(output->compositor);
	const struct weston_drm_output_api *api;
	enum weston_drm_backend_output_mode mode =
		WESTON_DRM_BACKEND_OUTPUT_PREFERRED;
	char *s;
	char *modeline = NULL;
	char *gbm_format = NULL;
	char *seat = NULL;

	api = weston_drm_output_get_api(output->compositor);
	if (!api) {
		weston_log("Cannot use weston_drm_output_api.\n");
		return -1;
	}

	weston_config_section_get_string(section, "mode", &s, "preferred");

	if (strcmp(s, "off") == 0) {
		assert(0 && "off was supposed to be pruned");
		return -1;
	} else if (wet->drm_use_current_mode || strcmp(s, "current") == 0) {
		mode = WESTON_DRM_BACKEND_OUTPUT_CURRENT;
	} else if (strcmp(s, "preferred") != 0) {
		modeline = s;
		s = NULL;
	}
	free(s);

	if (api->set_mode(output, mode, modeline) < 0) {
		weston_log("Cannot configure an output using weston_drm_output_api.\n");
		free(modeline);
		return -1;
	}
	free(modeline);

	wet_output_set_scale(output, section, 1, 0);
	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL, UINT32_MAX);

	weston_config_section_get_string(section,
					 "gbm-format", &gbm_format, NULL);

	api->set_gbm_format(output, gbm_format);
	free(gbm_format);

	weston_config_section_get_string(section, "seat", &seat, "");

	api->set_seat(output, seat);
	free(seat);

	return 0;
}

/* Find the output section to use for configuring the output with the
 * named head. If an output section with the given name contains
 * a "same-as" key, ignore all other settings in the output section and
 * instead find an output section named by the "same-as". Do this
 * recursively.
 */
static struct weston_config_section *
drm_config_find_controlling_output_section(struct weston_config *config,
					   const char *head_name)
{
	struct weston_config_section *section;
	char *same_as;
	int depth = 0;

	same_as = strdup(head_name);
	do {
		section = weston_config_get_section(config, "output",
						    "name", same_as);
		if (!section && depth > 0)
			weston_log("Configuration error: "
				   "output section referred to with "
				   "'same-as=%s' not found.\n", same_as);

		free(same_as);

		if (!section)
			return NULL;

		if (++depth > 10) {
			weston_log("Configuration error: "
				   "'same-as' nested too deep for output '%s'.\n",
				   head_name);
			return NULL;
		}

		weston_config_section_get_string(section, "same-as",
						 &same_as, NULL);
	} while (same_as);

	return section;
}

static struct wet_layoutput *
wet_compositor_create_layoutput(struct wet_compositor *compositor,
				const char *name,
				struct weston_config_section *section)
{
	struct wet_layoutput *lo;

	lo = zalloc(sizeof *lo);
	if (!lo)
		return NULL;

	lo->compositor = compositor;
	wl_list_insert(compositor->layoutput_list.prev, &lo->compositor_link);
	wl_list_init(&lo->output_list);
	lo->name = strdup(name);
	lo->section = section;

	return lo;
}

static void
wet_layoutput_destroy(struct wet_layoutput *lo)
{
	wl_list_remove(&lo->compositor_link);
	assert(wl_list_empty(&lo->output_list));
	free(lo->name);
	free(lo);
}

static void
wet_output_handle_destroy(struct wl_listener *listener, void *data)
{
	struct wet_output *output;

	output = wl_container_of(listener, output, output_destroy_listener);
	assert(output->output == data);

	output->output = NULL;
	wl_list_remove(&output->output_destroy_listener.link);
}

static struct wet_output *
wet_layoutput_create_output(struct wet_layoutput *lo, const char *name)
{
	struct wet_output *output;

	output = zalloc(sizeof *output);
	if (!output)
		return NULL;

	output->output =
		weston_compositor_create_output(lo->compositor->compositor,
						name);
	if (!output) {
		free(output);
		return NULL;
	}

	output->layoutput = lo;
	wl_list_insert(lo->output_list.prev, &output->link);
	output->output_destroy_listener.notify = wet_output_handle_destroy;
	weston_output_add_destroy_listener(output->output,
					   &output->output_destroy_listener);

	return output;
}

static struct wet_output *
wet_output_from_weston_output(struct weston_output *base)
{
	struct wl_listener *lis;

	lis = weston_output_get_destroy_listener(base,
						 wet_output_handle_destroy);
	if (!lis)
		return NULL;

	return container_of(lis, struct wet_output, output_destroy_listener);
}

static void
wet_output_destroy(struct wet_output *output)
{
	if (output->output)
		weston_output_destroy(output->output);

	wl_list_remove(&output->link);
	free(output);
}

static struct wet_layoutput *
wet_compositor_find_layoutput(struct wet_compositor *wet, const char *name)
{
	struct wet_layoutput *lo;

	wl_list_for_each(lo, &wet->layoutput_list, compositor_link)
		if (strcmp(lo->name, name) == 0)
			return lo;

	return NULL;
}

static void
wet_compositor_layoutput_add_head(struct wet_compositor *wet,
				  const char *output_name,
				  struct weston_config_section *section,
				  struct weston_head *head)
{
	struct wet_layoutput *lo;

	lo = wet_compositor_find_layoutput(wet, output_name);
	if (!lo) {
		lo = wet_compositor_create_layoutput(wet, output_name, section);
		if (!lo)
			return;
	}

	if (lo->add.n + 1 >= ARRAY_LENGTH(lo->add.heads))
		return;

	lo->add.heads[lo->add.n++] = head;
}

static void
wet_compositor_destroy_layout(struct wet_compositor *wet)
{
	struct wet_layoutput *lo, *lo_tmp;
	struct wet_output *output, *output_tmp;

	wl_list_for_each_safe(lo, lo_tmp,
			      &wet->layoutput_list, compositor_link) {
		wl_list_for_each_safe(output, output_tmp,
				      &lo->output_list, link) {
			wet_output_destroy(output);
		}
		wet_layoutput_destroy(lo);
	}
}

static void
drm_head_prepare_enable(struct wet_compositor *wet,
			struct weston_head *head)
{
	const char *name = weston_head_get_name(head);
	struct weston_config_section *section;
	char *output_name = NULL;
	char *mode = NULL;

	section = drm_config_find_controlling_output_section(wet->config, name);
	if (section) {
		/* skip outputs that are explicitly off, or non-desktop and not
		 * explicitly enabled. The backend turns them off automatically.
		 */
		weston_config_section_get_string(section, "mode", &mode, NULL);
		if (mode && strcmp(mode, "off") == 0) {
			free(mode);
			return;
		}
		if (!mode && weston_head_is_non_desktop(head))
			return;
		free(mode);

		weston_config_section_get_string(section, "name",
						 &output_name, NULL);
		assert(output_name);

		wet_compositor_layoutput_add_head(wet, output_name,
						  section, head);
		free(output_name);
	} else {
		wet_compositor_layoutput_add_head(wet, name, NULL, head);
	}
}

static bool
drm_head_should_force_enable(struct wet_compositor *wet,
			     struct weston_head *head)
{
	const char *name = weston_head_get_name(head);
	struct weston_config_section *section;
	int force = 0;

	section = drm_config_find_controlling_output_section(wet->config, name);
	if (!section)
		return false;

	weston_config_section_get_bool(section, "force-on", &force, 0);
	return !!force;
}

static void
drm_try_attach(struct weston_output *output,
	       struct wet_head_array *add,
	       struct wet_head_array *failed)
{
	unsigned i;

	/* try to attach all heads, this probably succeeds */
	for (i = 0; i < add->n; i++) {
		if (!add->heads[i])
			continue;

		if (weston_output_attach_head(output, add->heads[i]) < 0) {
			assert(failed->n < ARRAY_LENGTH(failed->heads));

			failed->heads[failed->n++] = add->heads[i];
			add->heads[i] = NULL;
		}
	}
}

static int
drm_try_enable(struct weston_output *output,
	       struct wet_head_array *undo,
	       struct wet_head_array *failed)
{
	/* Try to enable, and detach heads one by one until it succeeds. */
	while (!output->enabled) {
		if (weston_output_enable(output) == 0)
			return 0;

		/* the next head to drop */
		while (undo->n > 0 && undo->heads[--undo->n] == NULL)
			;

		/* No heads left to undo and failed to enable. */
		if (undo->heads[undo->n] == NULL)
			return -1;

		assert(failed->n < ARRAY_LENGTH(failed->heads));

		/* undo one head */
		weston_head_detach(undo->heads[undo->n]);
		failed->heads[failed->n++] = undo->heads[undo->n];
		undo->heads[undo->n] = NULL;
	}

	return 0;
}

static int
drm_try_attach_enable(struct weston_output *output, struct wet_layoutput *lo)
{
	struct wet_head_array failed = {};
	unsigned i;

	assert(!output->enabled);

	drm_try_attach(output, &lo->add, &failed);
	if (drm_backend_output_configure(output, lo->section) < 0)
		return -1;

	if (drm_try_enable(output, &lo->add, &failed) < 0)
		return -1;

	/* For all successfully attached/enabled heads */
	for (i = 0; i < lo->add.n; i++)
		if (lo->add.heads[i])
			wet_head_tracker_create(lo->compositor,
						lo->add.heads[i]);

	/* Push failed heads to the next round. */
	lo->add = failed;

	return 0;
}

static int
drm_process_layoutput(struct wet_compositor *wet, struct wet_layoutput *lo)
{
	struct wet_output *output, *tmp;
	char *name = NULL;
	int ret;

	/*
	 *   For each existing wet_output:
	 *     try attach
	 *   While heads left to enable:
	 *     Create output
	 *     try attach, try enable
	 */

	wl_list_for_each_safe(output, tmp, &lo->output_list, link) {
		struct wet_head_array failed = {};

		if (!output->output) {
			/* Clean up left-overs from destroyed heads. */
			wet_output_destroy(output);
			continue;
		}

		assert(output->output->enabled);

		drm_try_attach(output->output, &lo->add, &failed);
		lo->add = failed;
		if (lo->add.n == 0)
			return 0;
	}

	if (!weston_compositor_find_output_by_name(wet->compositor, lo->name))
		name = strdup(lo->name);

	while (lo->add.n > 0) {
		if (!wl_list_empty(&lo->output_list)) {
			weston_log("Error: independent-CRTC clone mode is not implemented.\n");
			return -1;
		}

		if (!name) {
			ret = asprintf(&name, "%s:%s", lo->name,
				       weston_head_get_name(lo->add.heads[0]));
			if (ret < 0)
				return -1;
		}
		output = wet_layoutput_create_output(lo, name);
		free(name);
		name = NULL;

		if (!output)
			return -1;

		if (drm_try_attach_enable(output->output, lo) < 0) {
			wet_output_destroy(output);
			return -1;
		}
	}

	return 0;
}

static int
drm_process_layoutputs(struct wet_compositor *wet)
{
	struct wet_layoutput *lo;
	int ret = 0;

	wl_list_for_each(lo, &wet->layoutput_list, compositor_link) {
		if (lo->add.n == 0)
			continue;

		if (drm_process_layoutput(wet, lo) < 0) {
			lo->add = (struct wet_head_array){};
			ret = -1;
		}
	}

	return ret;
}

static void
drm_head_disable(struct weston_head *head)
{
	struct weston_output *output_base;
	struct wet_output *output;
	struct wet_head_tracker *track;

	track = wet_head_tracker_from_head(head);
	if (track)
		wet_head_tracker_destroy(track);

	output_base = weston_head_get_output(head);
	assert(output_base);
	output = wet_output_from_weston_output(output_base);
	assert(output && output->output == output_base);

	weston_head_detach(head);
	if (count_remaining_heads(output->output, NULL) == 0)
		wet_output_destroy(output);
}

static void
drm_heads_changed(struct wl_listener *listener, void *arg)
{
	struct weston_compositor *compositor = arg;
	struct wet_compositor *wet = to_wet_compositor(compositor);
	struct weston_head *head = NULL;
	bool connected;
	bool enabled;
	bool changed;
	bool forced;

	/* We need to collect all cloned heads into outputs before enabling the
	 * output.
	 */
	while ((head = weston_compositor_iterate_heads(compositor, head))) {
		connected = weston_head_is_connected(head);
		enabled = weston_head_is_enabled(head);
		changed = weston_head_is_device_changed(head);
		forced = drm_head_should_force_enable(wet, head);

		if ((connected || forced) && !enabled) {
			drm_head_prepare_enable(wet, head);
		} else if (!(connected || forced) && enabled) {
			drm_head_disable(head);
		} else if (enabled && changed) {
			weston_log("Detected a monitor change on head '%s', "
				   "not bothering to do anything about it.\n",
				   weston_head_get_name(head));
		}
		weston_head_reset_device_changed(head);
	}

	if (drm_process_layoutputs(wet) < 0)
		wet->init_failed = true;
}

static int
drm_backend_remoted_output_configure(struct weston_output *output,
				     struct weston_config_section *section,
				     char *modeline,
				     const struct weston_remoting_api *api)
{
	char *gbm_format = NULL;
	char *seat = NULL;
	char *host = NULL;
	int port, ret;

	ret = api->set_mode(output, modeline);
	if (ret < 0) {
		weston_log("Cannot configure an output \"%s\" using "
			   "weston_remoting_api. Invalid mode\n",
			   output->name);
		return -1;
	}

	wet_output_set_scale(output, section, 1, 0);
	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL,
				 UINT32_MAX);

	weston_config_section_get_string(section, "gbm-format", &gbm_format,
					 NULL);
	api->set_gbm_format(output, gbm_format);
	free(gbm_format);

	weston_config_section_get_string(section, "seat", &seat, "");

	api->set_seat(output, seat);
	free(seat);

	weston_config_section_get_string(section, "host", &host, NULL);
	if (!host) {
		weston_log("Cannot configure an output \"%s\". Invalid host\n",
			   output->name);
		return -1;
	}
	api->set_host(output, host);
	free(host);

	weston_config_section_get_int(section, "port", &port, 0);
	if (port <= 0 || 65533 < port) {
		weston_log("Cannot configure an output \"%s\". Invalid port\n",
			   output->name);
		return -1;
	}
	api->set_port(output, port);

	return 0;
}

static void
remoted_output_init(struct weston_compositor *c,
		    struct weston_config_section *section,
		    const struct weston_remoting_api *api)
{
	struct weston_output *output = NULL;
	char *output_name, *modeline = NULL;
	int ret;

	weston_config_section_get_string(section, "name", &output_name,
					 NULL);
	if (!output_name)
		return;

	weston_config_section_get_string(section, "mode", &modeline, "off");
	if (strcmp(modeline, "off") == 0)
		goto err;

	output = api->create_output(c, output_name);
	if (!output) {
		weston_log("Cannot create remoted output \"%s\".\n",
			   output_name);
		goto err;
	}

	ret = drm_backend_remoted_output_configure(output, section, modeline,
						   api);
	if (ret < 0) {
		weston_log("Cannot configure remoted output \"%s\".\n",
			   output_name);
		goto err;
	}

	if (weston_output_enable(output) < 0) {
		weston_log("Enabling remoted output \"%s\" failed.\n",
			   output_name);
		goto err;
	}

	free(modeline);
	free(output_name);
	weston_log("remoted output '%s' enabled\n", output->name);
	return;

err:
	free(modeline);
	free(output_name);
	if (output)
		weston_output_destroy(output);
}

static void
load_remoting(struct weston_compositor *c, struct weston_config *wc)
{
	const struct weston_remoting_api *api = NULL;
	int (*module_init)(struct weston_compositor *ec);
	struct weston_config_section *section = NULL;
	const char *section_name;

	/* read remote-output section in weston.ini */
	while (weston_config_next_section(wc, &section, &section_name)) {
		if (strcmp(section_name, "remote-output"))
			continue;

		if (!api) {
			char *module_name;
			struct weston_config_section *core_section =
				weston_config_get_section(wc, "core", NULL,
							  NULL);

			weston_config_section_get_string(core_section,
							 "remoting",
							 &module_name,
							 "remoting-plugin.so");
			module_init = weston_load_module(module_name,
							 "weston_module_init");
			free(module_name);
			if (!module_init) {
				weston_log("Can't load remoting-plugin\n");
				return;
			}
			if (module_init(c) < 0) {
				weston_log("Remoting-plugin init failed\n");
				return;
			}

			api = weston_remoting_get_api(c);
			if (!api)
				return;
		}

		remoted_output_init(c, section, api);
	}
}

static int
load_drm_backend(struct weston_compositor *c,
		 int *argc, char **argv, struct weston_config *wc)
{
	struct weston_drm_backend_config config = {{ 0, }};
	struct weston_config_section *section;
	struct wet_compositor *wet = to_wet_compositor(c);
	int use_shadow;
	int ret = 0;
	int use_pixman_config_ = 0;
	int32_t use_pixman_ = 0;

	wet->drm_use_current_mode = false;

	section = weston_config_get_section(wc, "core", NULL, NULL);
	weston_config_section_get_bool(section, "use-pixman", &use_pixman_config_,
				       use_pixman_config_);
	use_pixman_ = use_pixman_config_;

	const struct weston_option options[] = {
		{ WESTON_OPTION_STRING, "seat", 0, &config.seat_id },
		{ WESTON_OPTION_INTEGER, "tty", 0, &config.tty },
		{ WESTON_OPTION_STRING, "drm-device", 0, &config.specific_device },
		{ WESTON_OPTION_BOOLEAN, "current-mode", 0, &wet->drm_use_current_mode },
		{ WESTON_OPTION_BOOLEAN, "use-pixman", 0, &use_pixman_ },
	};

	parse_options(options, ARRAY_LENGTH(options), argc, argv);
	config.use_pixman = use_pixman_;

	section = weston_config_get_section(wc, "core", NULL, NULL);
	weston_config_section_get_string(section,
					 "gbm-format", &config.gbm_format,
					 NULL);
	weston_config_section_get_uint(section, "pageflip-timeout",
	                               &config.pageflip_timeout, 0);
	weston_config_section_get_bool(section, "pixman-shadow", &use_shadow, 1);
	config.use_pixman_shadow = use_shadow;

	config.base.struct_version = WESTON_DRM_BACKEND_CONFIG_VERSION;
	config.base.struct_size = sizeof(struct weston_drm_backend_config);
	config.configure_device = configure_input_device;

	wet->heads_changed_listener.notify = drm_heads_changed;
	weston_compositor_add_heads_changed_listener(c,
						&wet->heads_changed_listener);

	ret = weston_compositor_load_backend(c, WESTON_BACKEND_DRM,
					     &config.base);

	/* remoting */
	load_remoting(c, wc);

	free(config.gbm_format);
	free(config.seat_id);

	return ret;
}

static int
headless_backend_output_configure(struct weston_output *output)
{
	struct wet_output_config defaults = {
		.width = 1024,
		.height = 640,
		.scale = 1,
		.transform = WL_OUTPUT_TRANSFORM_NORMAL
	};

	return wet_configure_windowed_output_from_config(output, &defaults);
}

static int
load_headless_backend(struct weston_compositor *c,
		      int *argc, char **argv, struct weston_config *wc)
{
	const struct weston_windowed_output_api *api;
	struct weston_headless_backend_config config = {{ 0, }};
	struct weston_config_section *section;
	int no_outputs = 0;
	int ret = 0;
	char *transform = NULL;
	int32_t use_pixman_config_ = 0;
	int use_pixman_ = 0;

	struct wet_output_config *parsed_options = wet_init_parsed_options(c);
	if (!parsed_options)
		return -1;

	section = weston_config_get_section(wc, "core", NULL, NULL);
	weston_config_section_get_bool(section, "use-pixman", &use_pixman_config_,
				       use_pixman_config_);
	use_pixman_ = use_pixman_config_;

	const struct weston_option options[] = {
		{ WESTON_OPTION_INTEGER, "width", 0, &parsed_options->width },
		{ WESTON_OPTION_INTEGER, "height", 0, &parsed_options->height },
		{ WESTON_OPTION_BOOLEAN, "use-pixman", 0, &use_pixman_ },
		{ WESTON_OPTION_STRING, "transform", 0, &transform },
		{ WESTON_OPTION_BOOLEAN, "no-outputs", 0, &no_outputs },
	};

	parse_options(options, ARRAY_LENGTH(options), argc, argv);
	config.use_pixman = use_pixman_;

	if (transform) {
		if (weston_parse_transform(transform, &parsed_options->transform) < 0) {
			weston_log("Invalid transform \"%s\"\n", transform);
			parsed_options->transform = UINT32_MAX;
		}
		free(transform);
	}

	config.base.struct_version = WESTON_HEADLESS_BACKEND_CONFIG_VERSION;
	config.base.struct_size = sizeof(struct weston_headless_backend_config);

	wet_set_simple_head_configurator(c, headless_backend_output_configure);

	/* load the actual wayland backend and configure it */
	ret = weston_compositor_load_backend(c, WESTON_BACKEND_HEADLESS,
					     &config.base);

	if (ret < 0)
		return ret;

	if (!no_outputs) {
		api = weston_windowed_output_get_api(c);

		if (!api) {
			weston_log("Cannot use weston_windowed_output_api.\n");
			return -1;
		}

		if (api->create_head(c, "headless") < 0)
			return -1;
	}

	return 0;
}

static int
rdp_backend_output_configure(struct weston_output *output)
{
	struct wet_compositor *compositor = to_wet_compositor(output->compositor);
	struct wet_output_config *parsed_options = compositor->parsed_options;
	const struct weston_rdp_output_api *api = weston_rdp_output_get_api(output->compositor);
	int width = 640;
	int height = 480;

	assert(parsed_options);

	if (!api) {
		weston_log("Cannot use weston_rdp_output_api.\n");
		return -1;
	}

	if (parsed_options->width)
		width = parsed_options->width;

	if (parsed_options->height)
		height = parsed_options->height;

	weston_output_set_scale(output, 1);
	weston_output_set_transform(output, WL_OUTPUT_TRANSFORM_NORMAL);

	if (api->output_set_size(output, width, height) < 0) {
		weston_log("Cannot configure output \"%s\" using weston_rdp_output_api.\n",
			   output->name);
		return -1;
	}

	return 0;
}

static void
weston_rdp_backend_config_init(struct weston_rdp_backend_config *config)
{
	config->base.struct_version = WESTON_RDP_BACKEND_CONFIG_VERSION;
	config->base.struct_size = sizeof(struct weston_rdp_backend_config);

	config->bind_address = NULL;
	config->port = 3389;
	config->rdp_key = NULL;
	config->server_cert = NULL;
	config->server_key = NULL;
	config->env_socket = 0;
	config->no_clients_resize = 0;
}

static int
load_rdp_backend(struct weston_compositor *c,
		int *argc, char *argv[], struct weston_config *wc)
{
	struct weston_rdp_backend_config config  = {{ 0, }};
	int ret = 0;

	struct wet_output_config *parsed_options = wet_init_parsed_options(c);
	if (!parsed_options)
		return -1;

	weston_rdp_backend_config_init(&config);

	const struct weston_option rdp_options[] = {
		{ WESTON_OPTION_BOOLEAN, "env-socket", 0, &config.env_socket },
		{ WESTON_OPTION_INTEGER, "width", 0, &parsed_options->width },
		{ WESTON_OPTION_INTEGER, "height", 0, &parsed_options->height },
		{ WESTON_OPTION_STRING,  "address", 0, &config.bind_address },
		{ WESTON_OPTION_INTEGER, "port", 0, &config.port },
		{ WESTON_OPTION_BOOLEAN, "no-clients-resize", 0, &config.no_clients_resize },
		{ WESTON_OPTION_STRING,  "rdp4-key", 0, &config.rdp_key },
		{ WESTON_OPTION_STRING,  "rdp-tls-cert", 0, &config.server_cert },
		{ WESTON_OPTION_STRING,  "rdp-tls-key", 0, &config.server_key }
	};

	parse_options(rdp_options, ARRAY_LENGTH(rdp_options), argc, argv);

	wet_set_simple_head_configurator(c, rdp_backend_output_configure);

	ret = weston_compositor_load_backend(c, WESTON_BACKEND_RDP,
					     &config.base);

	free(config.bind_address);
	free(config.rdp_key);
	free(config.server_cert);
	free(config.server_key);

	return ret;
}

static int
fbdev_backend_output_configure(struct weston_output *output)
{
	struct weston_config *wc = wet_get_config(output->compositor);
	struct weston_config_section *section;

	section = weston_config_get_section(wc, "output", "name", "fbdev");

	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL, UINT32_MAX);
	weston_output_set_scale(output, 1);

	return 0;
}

static int
load_fbdev_backend(struct weston_compositor *c,
		      int *argc, char **argv, struct weston_config *wc)
{
	struct weston_fbdev_backend_config config = {{ 0, }};
	int ret = 0;

	const struct weston_option fbdev_options[] = {
		{ WESTON_OPTION_INTEGER, "tty", 0, &config.tty },
		{ WESTON_OPTION_STRING, "device", 0, &config.device },
		{ WESTON_OPTION_STRING, "seat", 0, &config.seat_id },
	};

	parse_options(fbdev_options, ARRAY_LENGTH(fbdev_options), argc, argv);

	config.base.struct_version = WESTON_FBDEV_BACKEND_CONFIG_VERSION;
	config.base.struct_size = sizeof(struct weston_fbdev_backend_config);
	config.configure_device = configure_input_device;

	wet_set_simple_head_configurator(c, fbdev_backend_output_configure);

	/* load the actual wayland backend and configure it */
	ret = weston_compositor_load_backend(c, WESTON_BACKEND_FBDEV,
					     &config.base);

	free(config.device);
	return ret;
}

static int
x11_backend_output_configure(struct weston_output *output)
{
	struct wet_output_config defaults = {
		.width = 1024,
		.height = 600,
		.scale = 1,
		.transform = WL_OUTPUT_TRANSFORM_NORMAL
	};

	return wet_configure_windowed_output_from_config(output, &defaults);
}

static int
load_x11_backend(struct weston_compositor *c,
		 int *argc, char **argv, struct weston_config *wc)
{
	char *default_output;
	const struct weston_windowed_output_api *api;
	struct weston_x11_backend_config config = {{ 0, }};
	struct weston_config_section *section;
	int ret = 0;
	int option_count = 1;
	int output_count = 0;
	char const *section_name;
	int i;
	int32_t use_pixman_config_ = 0;
	int use_pixman_ = 0;

	struct wet_output_config *parsed_options = wet_init_parsed_options(c);
	if (!parsed_options)
		return -1;

	section = weston_config_get_section(wc, "core", NULL, NULL);
	weston_config_section_get_bool(section, "use-pixman", &use_pixman_config_,
				       use_pixman_config_);
	use_pixman_ = use_pixman_config_;

	const struct weston_option options[] = {
	       { WESTON_OPTION_INTEGER, "width", 0, &parsed_options->width },
	       { WESTON_OPTION_INTEGER, "height", 0, &parsed_options->height },
	       { WESTON_OPTION_INTEGER, "scale", 0, &parsed_options->scale },
	       { WESTON_OPTION_BOOLEAN, "fullscreen", 'f', &config.fullscreen },
	       { WESTON_OPTION_INTEGER, "output-count", 0, &option_count },
	       { WESTON_OPTION_BOOLEAN, "no-input", 0, &config.no_input },
	       { WESTON_OPTION_BOOLEAN, "use-pixman", 0, &use_pixman_ },
	};

	parse_options(options, ARRAY_LENGTH(options), argc, argv);
	config.use_pixman = use_pixman_;

	config.base.struct_version = WESTON_X11_BACKEND_CONFIG_VERSION;
	config.base.struct_size = sizeof(struct weston_x11_backend_config);

	wet_set_simple_head_configurator(c, x11_backend_output_configure);

	/* load the actual backend and configure it */
	ret = weston_compositor_load_backend(c, WESTON_BACKEND_X11,
					     &config.base);

	if (ret < 0)
		return ret;

	api = weston_windowed_output_get_api(c);

	if (!api) {
		weston_log("Cannot use weston_windowed_output_api.\n");
		return -1;
	}

	section = NULL;
	while (weston_config_next_section(wc, &section, &section_name)) {
		char *output_name;

		if (output_count >= option_count)
			break;

		if (strcmp(section_name, "output") != 0) {
			continue;
		}

		weston_config_section_get_string(section, "name", &output_name, NULL);
		if (output_name == NULL || output_name[0] != 'X') {
			free(output_name);
			continue;
		}

		if (api->create_head(c, output_name) < 0) {
			free(output_name);
			return -1;
		}
		free(output_name);

		output_count++;
	}

	default_output = NULL;

	for (i = output_count; i < option_count; i++) {
		if (asprintf(&default_output, "screen%d", i) < 0) {
			return -1;
		}

		if (api->create_head(c, default_output) < 0) {
			free(default_output);
			return -1;
		}
		free(default_output);
	}

	return 0;
}

static int
wayland_backend_output_configure(struct weston_output *output)
{
	struct wet_output_config defaults = {
		.width = 1024,
		.height = 640,
		.scale = 1,
		.transform = WL_OUTPUT_TRANSFORM_NORMAL
	};

	return wet_configure_windowed_output_from_config(output, &defaults);
}

static int
load_wayland_backend(struct weston_compositor *c,
		     int *argc, char **argv, struct weston_config *wc)
{
	struct weston_wayland_backend_config config = {{ 0, }};
	struct weston_config_section *section;
	const struct weston_windowed_output_api *api;
	const char *section_name;
	char *output_name = NULL;
	int count = 1;
	int ret = 0;
	int i;
	int32_t use_pixman_ = 0;
	int32_t sprawl_ = 0;
	int32_t fullscreen_ = 0;
	int use_pixman_config_ = 0;

	struct wet_output_config *parsed_options = wet_init_parsed_options(c);
	if (!parsed_options)
		return -1;

	config.cursor_size = 32;
	config.cursor_theme = NULL;
	config.display_name = NULL;

	section = weston_config_get_section(wc, "core", NULL, NULL);
	weston_config_section_get_bool(section, "use-pixman", &use_pixman_config_,
				       use_pixman_config_);
	use_pixman_ = use_pixman_config_;

	const struct weston_option wayland_options[] = {
		{ WESTON_OPTION_INTEGER, "width", 0, &parsed_options->width },
		{ WESTON_OPTION_INTEGER, "height", 0, &parsed_options->height },
		{ WESTON_OPTION_INTEGER, "scale", 0, &parsed_options->scale },
		{ WESTON_OPTION_STRING, "display", 0, &config.display_name },
		{ WESTON_OPTION_BOOLEAN, "use-pixman", 0, &use_pixman_ },
		{ WESTON_OPTION_INTEGER, "output-count", 0, &count },
		{ WESTON_OPTION_BOOLEAN, "fullscreen", 0, &fullscreen_ },
		{ WESTON_OPTION_BOOLEAN, "sprawl", 0, &sprawl_ },
	};

	parse_options(wayland_options, ARRAY_LENGTH(wayland_options), argc, argv);
	config.sprawl = sprawl_;
	config.fullscreen = fullscreen_;
	config.use_pixman = use_pixman_config_;

	section = weston_config_get_section(wc, "shell", NULL, NULL);
	weston_config_section_get_string(section, "cursor-theme",
					 &config.cursor_theme, NULL);
	weston_config_section_get_int(section, "cursor-size",
				      &config.cursor_size, 32);

	config.base.struct_size = sizeof(struct weston_wayland_backend_config);
	config.base.struct_version = WESTON_WAYLAND_BACKEND_CONFIG_VERSION;

	/* load the actual wayland backend and configure it */
	ret = weston_compositor_load_backend(c, WESTON_BACKEND_WAYLAND,
					     &config.base);

	free(config.cursor_theme);
	free(config.display_name);

	if (ret < 0)
		return ret;

	api = weston_windowed_output_get_api(c);

	if (api == NULL) {
		/* We will just assume if load_backend() finished cleanly and
		 * windowed_output_api is not present that wayland backend is
		 * started with --sprawl or runs on fullscreen-shell.
		 * In this case, all values are hardcoded, so nothing can be
		 * configured; simply create and enable an output. */
		wet_set_simple_head_configurator(c, NULL);

		return 0;
	}

	wet_set_simple_head_configurator(c, wayland_backend_output_configure);

	section = NULL;
	while (weston_config_next_section(wc, &section, &section_name)) {
		if (count == 0)
			break;

		if (strcmp(section_name, "output") != 0) {
			continue;
		}

		weston_config_section_get_string(section, "name", &output_name, NULL);

		if (output_name == NULL)
			continue;

		if (output_name[0] != 'W' || output_name[1] != 'L') {
			free(output_name);
			continue;
		}

		if (api->create_head(c, output_name) < 0) {
			free(output_name);
			return -1;
		}
		free(output_name);

		--count;
	}

	for (i = 0; i < count; i++) {
		if (asprintf(&output_name, "wayland%d", i) < 0)
			return -1;

		if (api->create_head(c, output_name) < 0) {
			free(output_name);
			return -1;
		}
		free(output_name);
	}

	return 0;
}


static int
load_backend(struct weston_compositor *compositor, const char *backend,
	     int *argc, char **argv, struct weston_config *config)
{
	if (strstr(backend, "headless-backend.so"))
		return load_headless_backend(compositor, argc, argv, config);
	else if (strstr(backend, "rdp-backend.so"))
		return load_rdp_backend(compositor, argc, argv, config);
	else if (strstr(backend, "fbdev-backend.so"))
		return load_fbdev_backend(compositor, argc, argv, config);
	else if (strstr(backend, "drm-backend.so"))
		return load_drm_backend(compositor, argc, argv, config);
	else if (strstr(backend, "x11-backend.so"))
		return load_x11_backend(compositor, argc, argv, config);
	else if (strstr(backend, "wayland-backend.so"))
		return load_wayland_backend(compositor, argc, argv, config);

	weston_log("Error: unknown backend \"%s\"\n", backend);
	return -1;
}

static char *
copy_command_line(int argc, char * const argv[])
{
	FILE *fp;
	char *str = NULL;
	size_t size = 0;
	int i;

	fp = open_memstream(&str, &size);
	if (!fp)
		return NULL;

	fprintf(fp, "%s", argv[0]);
	for (i = 1; i < argc; i++)
		fprintf(fp, " %s", argv[i]);
	fclose(fp);

	return str;
}

#if !defined(BUILD_XWAYLAND)
int
wet_load_xwayland(struct weston_compositor *comp)
{
	return -1;
}
#endif

int main(int argc, char *argv[])
{
	int ret = EXIT_FAILURE;
	char *cmdline;
	struct wl_display *display;
	struct wl_event_source *signals[4];
	struct wl_event_loop *loop;
	int i, fd;
	char *backend = NULL;
	char *shell = NULL;
	int32_t xwayland = 0;
	char *modules = NULL;
	char *option_modules = NULL;
	char *log = NULL;
	char *server_socket = NULL;
	int32_t idle_time = -1;
	int32_t help = 0;
	char *socket_name = NULL;
	int32_t version = 0;
	int32_t noconfig = 0;
	int32_t debug_protocol = 0;
	int32_t numlock_on;
	char *config_file = NULL;
	struct weston_config *config = NULL;
	struct weston_config_section *section;
	struct wl_client *primary_client;
	struct wl_listener primary_client_destroyed;
	struct weston_seat *seat;
	struct wet_compositor wet = { 0 };
	int require_input;
	sigset_t mask;

	int32_t wait_for_debugger = 0;
	struct wl_protocol_logger *protologger = NULL;

	const struct weston_option core_options[] = {
		{ WESTON_OPTION_STRING, "backend", 'B', &backend },
		{ WESTON_OPTION_STRING, "shell", 0, &shell },
		{ WESTON_OPTION_STRING, "socket", 'S', &socket_name },
		{ WESTON_OPTION_INTEGER, "idle-time", 'i', &idle_time },
#if defined(BUILD_XWAYLAND)
		{ WESTON_OPTION_BOOLEAN, "xwayland", 0, &xwayland },
#endif
		{ WESTON_OPTION_STRING, "modules", 0, &option_modules },
		{ WESTON_OPTION_STRING, "log", 0, &log },
		{ WESTON_OPTION_BOOLEAN, "help", 'h', &help },
		{ WESTON_OPTION_BOOLEAN, "version", 0, &version },
		{ WESTON_OPTION_BOOLEAN, "no-config", 0, &noconfig },
		{ WESTON_OPTION_STRING, "config", 'c', &config_file },
		{ WESTON_OPTION_BOOLEAN, "wait-for-debugger", 0, &wait_for_debugger },
		{ WESTON_OPTION_BOOLEAN, "debug", 0, &debug_protocol },
	};

	wl_list_init(&wet.layoutput_list);

	os_fd_set_cloexec(fileno(stdin));

	cmdline = copy_command_line(argc, argv);
	parse_options(core_options, ARRAY_LENGTH(core_options), &argc, argv);

	if (help) {
		free(cmdline);
		usage(EXIT_SUCCESS);
	}

	if (version) {
		printf(PACKAGE_STRING "\n");
		free(cmdline);

		return EXIT_SUCCESS;
	}

	weston_log_set_handler(vlog, vlog_continue);
	weston_log_file_open(log);

	weston_log("%s\n"
		   STAMP_SPACE "%s\n"
		   STAMP_SPACE "Bug reports to: %s\n"
		   STAMP_SPACE "Build: %s\n",
		   PACKAGE_STRING, PACKAGE_URL, PACKAGE_BUGREPORT,
		   BUILD_ID);
	weston_log("Command line: %s\n", cmdline);
	free(cmdline);
	log_uname();

	verify_xdg_runtime_dir();

	display = wl_display_create();

	loop = wl_display_get_event_loop(display);
	signals[0] = wl_event_loop_add_signal(loop, SIGTERM, on_term_signal,
					      display);
	signals[1] = wl_event_loop_add_signal(loop, SIGINT, on_term_signal,
					      display);
	signals[2] = wl_event_loop_add_signal(loop, SIGQUIT, on_term_signal,
					      display);

	wl_list_init(&child_process_list);
	signals[3] = wl_event_loop_add_signal(loop, SIGCHLD, sigchld_handler,
					      NULL);

	if (!signals[0] || !signals[1] || !signals[2] || !signals[3])
		goto out_signals;

	/* Xwayland uses SIGUSR1 for communicating with weston. Since some
	   weston plugins may create additional threads, set up any necessary
	   signal blocking early so that these threads can inherit the settings
	   when created. */
	sigemptyset(&mask);
	sigaddset(&mask, SIGUSR1);
	pthread_sigmask(SIG_BLOCK, &mask, NULL);

	if (load_configuration(&config, noconfig, config_file) < 0)
		goto out_signals;
	wet.config = config;
	wet.parsed_options = NULL;

	section = weston_config_get_section(config, "core", NULL, NULL);

	if (!wait_for_debugger)
		weston_config_section_get_bool(section, "wait-for-debugger",
					       &wait_for_debugger, 0);
	if (wait_for_debugger) {
		weston_log("Weston PID is %ld - "
			   "waiting for debugger, send SIGCONT to continue...\n",
			   (long)getpid());
		raise(SIGSTOP);
	}

	if (!backend) {
		weston_config_section_get_string(section, "backend", &backend,
						 NULL);
		if (!backend)
			backend = weston_choose_default_backend();
	}

	wet.compositor = weston_compositor_create(display, &wet);
	if (wet.compositor == NULL) {
		weston_log("fatal: failed to create compositor\n");
		goto out;
	}
	segv_compositor = wet.compositor;

	log_scope = weston_compositor_add_debug_scope(wet.compositor, "log",
			"Weston and Wayland log\n", NULL, NULL);
	protocol_scope =
		weston_compositor_add_debug_scope(wet.compositor,
			"proto",
			"Wayland protocol dump for all clients.\n",
			NULL, NULL);

	if (debug_protocol) {
		protologger = wl_display_add_protocol_logger(display,
							     protocol_log_fn,
							     NULL);
		weston_compositor_enable_debug_protocol(wet.compositor);
	}

	if (weston_compositor_init_config(wet.compositor, config) < 0)
		goto out;

	weston_config_section_get_bool(section, "require-input",
				       &require_input, true);
	wet.compositor->require_input = require_input;

	if (load_backend(wet.compositor, backend, &argc, argv, config) < 0) {
		weston_log("fatal: failed to create compositor backend\n");
		goto out;
	}

	weston_compositor_flush_heads_changed(wet.compositor);
	if (wet.init_failed)
		goto out;

	if (idle_time < 0)
		weston_config_section_get_int(section, "idle-time", &idle_time, -1);
	if (idle_time < 0)
		idle_time = 300; /* default idle timeout, in seconds */

	wet.compositor->idle_time = idle_time;
	wet.compositor->default_pointer_grab = NULL;
	wet.compositor->exit = handle_exit;

	weston_compositor_log_capabilities(wet.compositor);

	server_socket = getenv("WAYLAND_SERVER_SOCKET");
	if (server_socket) {
		weston_log("Running with single client\n");
		if (!safe_strtoint(server_socket, &fd))
			fd = -1;
	} else {
		fd = -1;
	}

	if (fd != -1) {
		primary_client = wl_client_create(display, fd);
		if (!primary_client) {
			weston_log("fatal: failed to add client: %m\n");
			goto out;
		}
		primary_client_destroyed.notify =
			handle_primary_client_destroyed;
		wl_client_add_destroy_listener(primary_client,
					       &primary_client_destroyed);
	} else if (weston_create_listening_socket(display, socket_name)) {
		goto out;
	}

	if (!shell)
		weston_config_section_get_string(section, "shell", &shell,
						 "desktop-shell.so");

	if (wet_load_shell(wet.compositor, shell, &argc, argv) < 0)
		goto out;

	weston_config_section_get_string(section, "modules", &modules, "");
	if (load_modules(wet.compositor, modules, &argc, argv, &xwayland) < 0)
		goto out;

	if (load_modules(wet.compositor, option_modules, &argc, argv, &xwayland) < 0)
		goto out;

	if (!xwayland)
		weston_config_section_get_bool(section, "xwayland", &xwayland,
					       false);
	if (xwayland) {
		if (wet_load_xwayland(wet.compositor) < 0)
			goto out;
	}

	section = weston_config_get_section(config, "keyboard", NULL, NULL);
	weston_config_section_get_bool(section, "numlock-on", &numlock_on, 0);
	if (numlock_on) {
		wl_list_for_each(seat, &wet.compositor->seat_list, link) {
			struct weston_keyboard *keyboard =
				weston_seat_get_keyboard(seat);

			if (keyboard)
				weston_keyboard_set_locks(keyboard,
							  WESTON_NUM_LOCK,
							  WESTON_NUM_LOCK);
		}
	}

	for (i = 1; i < argc; i++)
		weston_log("fatal: unhandled option: %s\n", argv[i]);
	if (argc > 1)
		goto out;

	weston_compositor_wake(wet.compositor);

	wl_display_run(display);

	/* Allow for setting return exit code after
	* wl_display_run returns normally. This is
	* useful for devs/testers and automated tests
	* that want to indicate failure status to
	* testing infrastructure above
	*/
	ret = wet.compositor->exit_code;

out:
	wet_compositor_destroy_layout(&wet);

	/* free(NULL) is valid, and it won't be NULL if it's used */
	free(wet.parsed_options);

	if (protologger)
		wl_protocol_logger_destroy(protologger);

	weston_debug_scope_destroy(protocol_scope);
	protocol_scope = NULL;
	weston_debug_scope_destroy(log_scope);
	log_scope = NULL;
	weston_compositor_destroy(wet.compositor);

out_signals:
	for (i = ARRAY_LENGTH(signals) - 1; i >= 0; i--)
		if (signals[i])
			wl_event_source_remove(signals[i]);

	wl_display_destroy(display);

	weston_log_file_close();

	if (config)
		weston_config_destroy(config);
	free(config_file);
	free(backend);
	free(shell);
	free(socket_name);
	free(option_modules);
	free(log);
	free(modules);

	return ret;
}