void osd_init(running_machine *machine)
{
	int watchdog = options_get_int(mame_options(), WINOPTION_WATCHDOG);
	const char *stemp;

	// thread priority
	if (!(machine->debug_flags & DEBUG_FLAG_OSD_ENABLED))
		SetThreadPriority(GetCurrentThread(), options_get_int(mame_options(), WINOPTION_PRIORITY));

	// ensure we get called on the way out
	add_exit_callback(machine, osd_exit);

	// get number of processors
	stemp = options_get_string(mame_options(), WINOPTION_NUMPROCESSORS);

	osd_num_processors = 0;

	if (strcmp(stemp, "auto") != 0)
	{
		osd_num_processors = atoi(stemp);
		if (osd_num_processors < 1)
		{
			mame_printf_warning("Warning: numprocessors < 1 doesn't make much sense. Assuming auto ...\n");
			osd_num_processors = 0;
		}
	}

	// initialize the subsystems
	winvideo_init(machine);
	winsound_init(machine);
	wininput_init(machine);
	winoutput_init(machine);

	// hook up the debugger log
	if (options_get_bool(mame_options(), WINOPTION_OSLOG))
		add_logerror_callback(machine, output_oslog);

	// crank up the multimedia timer resolution to its max
	// this gives the system much finer timeslices
	timeresult = timeGetDevCaps(&caps, sizeof(caps));
	if (timeresult == TIMERR_NOERROR)
		timeBeginPeriod(caps.wPeriodMin);

	// set our multimedia tasks if we can
//      if (av_set_mm_thread_characteristics != NULL)
//          mm_task = (*av_set_mm_thread_characteristics)(TEXT("Playback"), &task_index);

	start_profiler();

	// if a watchdog thread is requested, create one
	if (watchdog != 0)
	{
		watchdog_reset_event = CreateEvent(NULL, FALSE, FALSE, NULL);
		assert_always(watchdog_reset_event != NULL, "Failed to create watchdog reset event");
		watchdog_exit_event = CreateEvent(NULL, TRUE, FALSE, NULL);
		assert_always(watchdog_exit_event != NULL, "Failed to create watchdog exit event");
		watchdog_thread = CreateThread(NULL, 0, watchdog_thread_entry, (LPVOID)(FPTR)watchdog, 0, NULL);
		assert_always(watchdog_thread != NULL, "Failed to create watchdog thread");
	}
}

void
cmd_set_option_string(struct cmd_ctx *ctx, struct options *oo,
    const struct set_option_entry *entry, char *value, int append)
{
	struct options_entry	*o;
	char			*oldvalue, *newvalue;

	if (value == NULL) {
		ctx->error(ctx, "empty value");
		return;
	}

	if (append) {
		oldvalue = options_get_string(oo, entry->name);
		xasprintf(&newvalue, "%s%s", oldvalue, value);
	} else
		newvalue = value;

	o = options_set_string(oo, entry->name, "%s", newvalue);
	ctx->info(ctx,
	    "set option: %s -> %s", o->name, cmd_set_option_print(entry, o));

	if (newvalue != value)
		xfree(newvalue);
}

int config_load_settings(running_machine *machine)
{
	const char *controller = options_get_string(mame_options(), OPTION_CTRLR);
	file_error filerr;
	config_type *type;
	mame_file *file;
	int loaded = 0;
	astring *fname;

	/* loop over all registrants and call their init function */
	for (type = typelist; type; type = type->next)
		(*type->load)(CONFIG_TYPE_INIT, NULL);

	/* now load the controller file */
	if (controller[0] != 0)
	{
		/* open the config file */
		fname = astring_assemble_2(astring_alloc(), controller, ".cfg");
		filerr = mame_fopen(SEARCHPATH_CTRLR, astring_c(fname), OPEN_FLAG_READ, &file);
		astring_free(fname);

		if (filerr != FILERR_NONE)
			fatalerror("Could not load controller file %s.cfg", controller);

		/* load the XML */
		if (!config_load_xml(machine, file, CONFIG_TYPE_CONTROLLER))
			fatalerror("Could not load controller file %s.cfg", controller);
		mame_fclose(file);
	}

	/* next load the defaults file */
	filerr = mame_fopen(SEARCHPATH_CONFIG, "default.cfg", OPEN_FLAG_READ, &file);
	if (filerr == FILERR_NONE)
	{
		config_load_xml(machine, file, CONFIG_TYPE_DEFAULT);
		mame_fclose(file);
	}

	/* finally, load the game-specific file */
	fname = astring_assemble_2(astring_alloc(), machine->basename, ".cfg");
	filerr = mame_fopen(SEARCHPATH_CONFIG, astring_c(fname), OPEN_FLAG_READ, &file);
	astring_free(fname);

	if (filerr == FILERR_NONE)
	{
		loaded = config_load_xml(machine, file, CONFIG_TYPE_GAME);
		mame_fclose(file);
	}

	/* loop over all registrants and call their final function */
	for (type = typelist; type; type = type->next)
		(*type->load)(CONFIG_TYPE_FINAL, NULL);

	/* if we didn't find a saved config, return 0 so the main core knows that it */
	/* is the first time the game is run and it should diplay the disclaimer. */
	return loaded;
}

void sound_init(running_machine *machine)
{
	attotime update_frequency = SOUND_UPDATE_FREQUENCY;
	const char *filename;

	/* handle -nosound */
	nosound_mode = !options_get_bool(mame_options(), OPTION_SOUND);
	if (nosound_mode)
		Machine->sample_rate = 11025;

	/* count the speakers */
	for (totalspeakers = 0; Machine->drv->speaker[totalspeakers].tag; totalspeakers++) ;
	VPRINTF(("total speakers = %d\n", totalspeakers));

	/* allocate memory for mix buffers */
	leftmix = auto_malloc(Machine->sample_rate * sizeof(*leftmix));
	rightmix = auto_malloc(Machine->sample_rate * sizeof(*rightmix));
	finalmix = auto_malloc(Machine->sample_rate * sizeof(*finalmix));

	/* allocate a global timer for sound timing */
	sound_update_timer = timer_alloc(sound_update, NULL);
	timer_adjust(sound_update_timer, update_frequency, 0, update_frequency);

	/* initialize the streams engine */
	VPRINTF(("streams_init\n"));
	streams_init(machine, update_frequency.attoseconds);

	/* now start up the sound chips and tag their streams */
	VPRINTF(("start_sound_chips\n"));
	start_sound_chips();

	/* then create all the speakers */
	VPRINTF(("start_speakers\n"));
	start_speakers();

	/* finally, do all the routing */
	VPRINTF(("route_sound\n"));
	route_sound();

	/* open the output WAV file if specified */
	filename = options_get_string(mame_options(), OPTION_WAVWRITE);
	if (filename[0] != 0)
		wavfile = wav_open(filename, machine->sample_rate, 2);

	/* enable sound by default */
	global_sound_enabled = TRUE;
	sound_muted = FALSE;
	sound_set_attenuation(options_get_int(mame_options(), OPTION_VOLUME));

	/* register callbacks */
	config_register("mixer", sound_load, sound_save);
	add_pause_callback(machine, sound_pause);
	add_reset_callback(machine, sound_reset);
	add_exit_callback(machine, sound_exit);
}

const char *image_get_device_option(device_image_interface *image)
{
	const char *result = NULL;

	if (options_get_bool(image->device().machine->options(), OPTION_ADDED_DEVICE_OPTIONS))
	{
		/* access the option */
		result = options_get_string(image->device().machine->options(),  image->image_config().instance_name());
	}
	return result;
}

void
server_fill_environ(struct session *s, struct environ *env)
{
	char		 tmuxvar[MAXPATHLEN], *term;
	u_int		 idx;

	if (session_index(s, &idx) != 0)
		fatalx("session not found");
	xsnprintf(tmuxvar, sizeof tmuxvar,
	    "%s,%ld,%u", socket_path, (long) getpid(), idx);
	environ_set(env, "TMUX", tmuxvar);

	term = options_get_string(&s->options, "default-terminal");
	environ_set(env, "TERM", term);
}

char *
format_window_name(struct window *w)
{
	struct format_tree	*ft;
	char			*fmt, *name;

	ft = format_create(NULL, 0);
	format_defaults_window(ft, w);
	format_defaults_pane(ft, w->active);

	fmt = options_get_string(w->options, "automatic-rename-format");
	name = format_expand(ft, fmt);

	format_free(ft);
	return (name);
}

static int options_get(lua_State * L) {
    name k = to_name_ext(L, 2);
    auto it = get_option_declarations().find(k);
    if (it == get_option_declarations().end()) {
        throw exception(sstream() << "unknown option '" << k.to_string().c_str() << "'");
    } else {
        option_declaration const & d = it->second;
        switch (d.kind()) {
        case BoolOption:      return options_get_bool(L);
        case IntOption:       return options_get_int(L);
        case UnsignedOption:  return options_get_unsigned(L);
        case DoubleOption:    return options_get_double(L);
        case StringOption:    return options_get_string(L);
        default:              throw exception(sstream() << "unsupported option kind for '" << k.to_string().c_str() << "'");
        }
    }
}

void sound_init(running_machine *machine)
{
	sound_private *global;
	const char *filename;

	machine->sound_data = global = auto_alloc_clear(machine, sound_private);

	/* handle -nosound */
	global->nosound_mode = !options_get_bool(machine->options(), OPTION_SOUND);
	if (global->nosound_mode)
		machine->sample_rate = 11025;

	/* count the speakers */
	VPRINTF(("total speakers = %d\n", speaker_output_count(machine->config)));

	/* allocate memory for mix buffers */
	global->leftmix = auto_alloc_array(machine, INT32, machine->sample_rate);
	global->rightmix = auto_alloc_array(machine, INT32, machine->sample_rate);
	global->finalmix = auto_alloc_array(machine, INT16, machine->sample_rate);

	/* allocate a global timer for sound timing */
	global->update_timer = timer_alloc(machine, sound_update, NULL);
	timer_adjust_periodic(global->update_timer, STREAMS_UPDATE_ATTOTIME, 0, STREAMS_UPDATE_ATTOTIME);

	/* finally, do all the routing */
	VPRINTF(("route_sound\n"));
	route_sound(machine);

	/* open the output WAV file if specified */
	filename = options_get_string(machine->options(), OPTION_WAVWRITE);
	if (filename[0] != 0)
		global->wavfile = wav_open(filename, machine->sample_rate, 2);

	/* enable sound by default */
	global->enabled = TRUE;
	global->muted = FALSE;
	sound_set_attenuation(machine, options_get_int(machine->options(), OPTION_VOLUME));

	/* register callbacks */
	config_register(machine, "mixer", sound_load, sound_save);
	machine->add_notifier(MACHINE_NOTIFY_PAUSE, sound_pause);
	machine->add_notifier(MACHINE_NOTIFY_RESUME, sound_resume);
	machine->add_notifier(MACHINE_NOTIFY_RESET, sound_reset);
	machine->add_notifier(MACHINE_NOTIFY_EXIT, sound_exit);
}

static void set_starting_view(running_machine *machine, int index, sdl_window_info *window, const char *view)
{
	const char *defview = options_get_string(machine->options(), SDLOPTION_VIEW( ));
	int viewindex;

	ASSERT_MAIN_THREAD();

	// choose non-auto over auto
	if (strcmp(view, "auto") == 0 && strcmp(defview, "auto") != 0)
		view = defview;

	// query the video system to help us pick a view
	viewindex = video_get_view_for_target(machine, window->target, view, index, video_config.numscreens);

	// set the view
	render_target_set_view(window->target, viewindex);
	window->start_viewscreen=viewindex;
}

/* Find the history file to load/save from/to. */
static char *
status_prompt_find_history_file(void)
{
	const char	*home, *history_file;
	char		*path;

	history_file = options_get_string(global_options, "history-file");
	if (*history_file == '\0')
		return (NULL);
	if (*history_file == '/')
		return (xstrdup(history_file));

	if (history_file[0] != '~' || history_file[1] != '/')
		return (NULL);
	if ((home = find_home()) == NULL)
		return (NULL);
	xasprintf(&path, "%s%s", home, history_file + 1);
	return (path);
}

/* Set a string option. */
struct options_entry *
cmd_set_option_string(struct cmd *self, unused struct cmd_q *cmdq,
    const struct options_table_entry *oe, struct options *oo, const char *value)
{
	struct args		*args = self->args;
	struct options_entry	*o;
	char			*oldval, *newval;

	if (args_has(args, 'a')) {
		oldval = options_get_string(oo, oe->name);
		xasprintf(&newval, "%s%s", oldval, value);
	} else
		newval = xstrdup(value);

	o = options_set_string(oo, oe->name, "%s", newval);

	free(newval);
	return (o);
}

/* Set a string option. */
struct options_entry *
cmd_set_option_string(struct cmd *self, unused struct cmd_ctx *ctx,
    const struct options_table_entry *oe, struct options *oo)
{
	struct cmd_target_data	*data = self->data;
	struct options_entry	*o;
	char			*oldval, *newval;

	if (cmd_check_flag(data->chflags, 'a')) {
		oldval = options_get_string(oo, oe->name);
		xasprintf(&newval, "%s%s", oldval, data->arg2);
	} else
		newval = data->arg2;

	o = options_set_string(oo, oe->name, "%s", newval);

	if (newval != data->arg2)
		xfree(newval);
	return (o);
}

void running_machine::schedule_exit()
{
	// if we are in-game but we started with the select game menu, return to that instead
	if (m_exit_to_game_select && options_get_string(&m_options, OPTION_GAMENAME)[0] != 0)
	{
		options_set_string(&m_options, OPTION_GAMENAME, "", OPTION_PRIORITY_CMDLINE);
		ui_menu_force_game_select(this, render_container_get_ui());
	}

	// otherwise, exit for real
	else
		m_exit_pending = true;

	// if we're executing, abort out immediately
	m_scheduler.eat_all_cycles();

	// if we're autosaving on exit, schedule a save as well
	if (options_get_bool(&m_options, OPTION_AUTOSAVE) && (m_game.flags & GAME_SUPPORTS_SAVE))
		schedule_save("auto");
}

static void lookup_and_connect(void)
{
	struct evutil_addrinfo hints;
	const char *tmate_server_host;

	if (!tmate_session.ev_dnsbase)
		tmate_session.ev_dnsbase = evdns_base_new(tmate_session.ev_base, 1);
	if (!tmate_session.ev_dnsbase)
		tmate_fatal("Cannot initialize the DNS lookup service");

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_UNSPEC;
	hints.ai_flags = EVUTIL_AI_ADDRCONFIG;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;

	tmate_server_host = options_get_string(global_options,
					       "tmate-server-host");
	tmate_info("Looking up %s...", tmate_server_host);
	(void)evdns_getaddrinfo(tmate_session.ev_dnsbase, tmate_server_host, NULL,
				&hints, dns_cb, (void *)tmate_server_host);
}

enum cmd_retval
cmd_new_window_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct session		*s;
	struct winlink		*wl;
	struct client		*c;
	const char		*cmd, *template;
	char			*cause, *cp;
	int			 idx, last, detached, cwd, fd = -1;
	struct format_tree	*ft;

	if (args_has(args, 'a')) {
		wl = cmd_find_window(cmdq, args_get(args, 't'), &s);
		if (wl == NULL)
			return (CMD_RETURN_ERROR);
		idx = wl->idx + 1;

		/* Find the next free index. */
		for (last = idx; last < INT_MAX; last++) {
			if (winlink_find_by_index(&s->windows, last) == NULL)
				break;
		}
		if (last == INT_MAX) {
			cmdq_error(cmdq, "no free window indexes");
			return (CMD_RETURN_ERROR);
		}

		/* Move everything from last - 1 to idx up a bit. */
		for (; last > idx; last--) {
			wl = winlink_find_by_index(&s->windows, last - 1);
			server_link_window(s, wl, s, last, 0, 0, NULL);
			server_unlink_window(s, wl);
		}
	} else {
		if ((idx = cmd_find_index(cmdq, args_get(args, 't'), &s)) == -2)
			return (CMD_RETURN_ERROR);
	}
	detached = args_has(args, 'd');

	wl = NULL;
	if (idx != -1)
		wl = winlink_find_by_index(&s->windows, idx);
	if (wl != NULL && args_has(args, 'k')) {
		/*
		 * Can't use session_detach as it will destroy session if this
		 * makes it empty.
		 */
		notify_window_unlinked(s, wl->window);
		wl->flags &= ~WINLINK_ALERTFLAGS;
		winlink_stack_remove(&s->lastw, wl);
		winlink_remove(&s->windows, wl);

		/* Force select/redraw if current. */
		if (wl == s->curw) {
			detached = 0;
			s->curw = NULL;
		}
	}

	if (args->argc == 0)
		cmd = options_get_string(&s->options, "default-command");
	else
		cmd = args->argv[0];

	if (args_has(args, 'c')) {
		ft = format_create();
		if ((c = cmd_find_client(cmdq, NULL, 1)) != NULL)
			format_client(ft, c);
		format_session(ft, s);
		format_winlink(ft, s, s->curw);
		format_window_pane(ft, s->curw->window->active);
		cp = format_expand(ft, args_get(args, 'c'));
		format_free(ft);

		fd = open(cp, O_RDONLY|O_DIRECTORY);
		free(cp);
		if (fd == -1) {
			cmdq_error(cmdq, "bad working directory: %s",
			    strerror(errno));
			return (CMD_RETURN_ERROR);
		}
		cwd = fd;
	} else if (cmdq->client != NULL && cmdq->client->session == NULL)
		cwd = cmdq->client->cwd;
	else
		cwd = s->cwd;

	if (idx == -1)
		idx = -1 - options_get_number(&s->options, "base-index");
	wl = session_new(s, args_get(args, 'n'), cmd, cwd, idx, &cause);
	if (wl == NULL) {
		cmdq_error(cmdq, "create window failed: %s", cause);
		free(cause);
		goto error;
	}
	if (!detached) {
		session_select(s, wl->idx);
		server_redraw_session_group(s);
	} else
//.........这里部分代码省略.........

int
cmd_save_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct args		*args = self->args;
	struct client		*c = ctx->cmdclient;
	struct session          *s;
	struct paste_buffer	*pb;
	const char		*path, *newpath, *wd;
	char			*cause;
	int			 buffer;
	mode_t			 mask;
	FILE			*f;

	if (!args_has(args, 'b')) {
		if ((pb = paste_get_top(&global_buffers)) == NULL) {
			ctx->error(ctx, "no buffers");
			return (-1);
		}
	} else {
		buffer = args_strtonum(args, 'b', 0, INT_MAX, &cause);
		if (cause != NULL) {
			ctx->error(ctx, "buffer %s", cause);
			xfree(cause);
			return (-1);
		}

		pb = paste_get_index(&global_buffers, buffer);
		if (pb == NULL) {
			ctx->error(ctx, "no buffer %d", buffer);
			return (-1);
		}
	}

	path = args->argv[0];
	if (strcmp(path, "-") == 0) {
		if (c == NULL) {
			ctx->error(ctx, "%s: can't write to stdout", path);
			return (-1);
		}
		evbuffer_add(c->stdout_data, pb->data, pb->size);
		server_push_stdout(c);
	} else {
		if (c != NULL)
			wd = c->cwd;
		else if ((s = cmd_current_session(ctx, 0)) != NULL) {
			wd = options_get_string(&s->options, "default-path");
			if (*wd == '\0')
				wd = s->cwd;
		} else
			wd = NULL;
		if (wd != NULL && *wd != '\0') {
			newpath = get_full_path(wd, path);
			if (newpath != NULL)
				path = newpath;
		}

		mask = umask(S_IRWXG | S_IRWXO);
		if (args_has(self->args, 'a'))
			f = fopen(path, "ab");
		else
			f = fopen(path, "wb");
		umask(mask);
		if (f == NULL) {
			ctx->error(ctx, "%s: %s", path, strerror(errno));
			return (-1);
		}
		if (fwrite(pb->data, 1, pb->size, f) != pb->size) {
			ctx->error(ctx, "%s: fwrite error", path);
			fclose(f);
			return (-1);
		}
		fclose(f);
	}

	return (0);
}

int
cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_split_window_data	*data = self->data;
	struct session			*s;
	struct winlink			*wl;
	struct window			*w;
	struct window_pane		*wp, *new_wp = NULL;
	struct environ			 env;
	char		 		*cmd, *cwd, *cause;
	const char			*shell;
	u_int				 hlimit;
	int				 size;
	enum layout_type		 type;
	struct layout_cell		*lc;

	if ((wl = cmd_find_pane(ctx, data->target, &s, &wp)) == NULL)
		return (-1);
	w = wl->window;

	environ_init(&env);
	environ_copy(&global_environ, &env);
	environ_copy(&s->environ, &env);
	server_fill_environ(s, &env);

	cmd = data->cmd;
	if (cmd == NULL)
		cmd = options_get_string(&s->options, "default-command");
	if (ctx->cmdclient == NULL || ctx->cmdclient->cwd == NULL)
		cwd = options_get_string(&s->options, "default-path");
	else
		cwd = ctx->cmdclient->cwd;

	type = LAYOUT_TOPBOTTOM;
	if (data->flag_horizontal)
		type = LAYOUT_LEFTRIGHT;

	size = -1;
	if (data->size != -1)
		size = data->size;
	else if (data->percentage != -1) {
		if (type == LAYOUT_TOPBOTTOM)
			size = (wp->sy * data->percentage) / 100;
		else
			size = (wp->sx * data->percentage) / 100;
	}
	hlimit = options_get_number(&s->options, "history-limit");

	shell = options_get_string(&s->options, "default-shell");
	if (*shell == '\0' || areshell(shell))
		shell = _PATH_BSHELL;

	if ((lc = layout_split_pane(wp, type, size)) == NULL) {
		cause = xstrdup("pane too small");
		goto error;
	}
	new_wp = window_add_pane(w, hlimit);
	if (window_pane_spawn(
	    new_wp, cmd, shell, cwd, &env, s->tio, &cause) != 0)
		goto error;
	layout_assign_pane(lc, new_wp);

	server_redraw_window(w);

	if (!data->flag_detached) {
		window_set_active_pane(w, new_wp);
		session_select(s, wl->idx);
		server_redraw_session(s);
	} else
		server_status_session(s);

	environ_free(&env);
	return (0);

error:
	environ_free(&env);
	if (new_wp != NULL)
		window_remove_pane(w, new_wp);
	ctx->error(ctx, "create pane failed: %s", cause);
	xfree(cause);
	return (-1);
}

int
cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct args		*args = self->args;
	struct session		*s;
	struct winlink		*wl;
	struct window		*w;
	struct window_pane	*wp, *new_wp = NULL;
	struct environ		 env;
	char		 	*cmd, *cwd, *cause;
	const char		*shell;
	u_int			 hlimit, paneidx;
	int			 size, percentage;
	enum layout_type	 type;
	struct layout_cell	*lc;

	if ((wl = cmd_find_pane(ctx, args_get(args, 't'), &s, &wp)) == NULL)
		return (-1);
	w = wl->window;

	environ_init(&env);
	environ_copy(&global_environ, &env);
	environ_copy(&s->environ, &env);
	server_fill_environ(s, &env);

	if (args->argc == 0)
		cmd = options_get_string(&s->options, "default-command");
	else
		cmd = args->argv[0];
	cwd = options_get_string(&s->options, "default-path");
	if (*cwd == '\0') {
		if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
			cwd = ctx->cmdclient->cwd;
		else
			cwd = s->cwd;
	}

	type = LAYOUT_TOPBOTTOM;
	if (args_has(args, 'h'))
		type = LAYOUT_LEFTRIGHT;

	size = -1;
	if (args_has(args, 's')) {
		size = args_strtonum(args, 's', 0, INT_MAX, &cause);
		if (cause != NULL) {
			ctx->error(ctx, "size %s", cause);
			xfree(cause);
			return (-1);
		}
	} else if (args_has(args, 'p')) {
		percentage = args_strtonum(args, 'p', 0, INT_MAX, &cause);
		if (cause != NULL) {
			ctx->error(ctx, "percentage %s", cause);
			xfree(cause);
			return (-1);
		}
		if (type == LAYOUT_TOPBOTTOM)
			size = (wp->sy * percentage) / 100;
		else
			size = (wp->sx * percentage) / 100;
	}
	hlimit = options_get_number(&s->options, "history-limit");

	shell = options_get_string(&s->options, "default-shell");
	if (*shell == '\0' || areshell(shell))
		shell = _PATH_BSHELL;

	if ((lc = layout_split_pane(wp, type, size)) == NULL) {
		cause = xstrdup("pane too small");
		goto error;
	}
	new_wp = window_add_pane(w, hlimit);
	if (window_pane_spawn(
	    new_wp, cmd, shell, cwd, &env, s->tio, &cause) != 0)
		goto error;
	layout_assign_pane(lc, new_wp);

	server_redraw_window(w);

	if (!args_has(args, 'd')) {
		window_set_active_pane(w, new_wp);
		session_select(s, wl->idx);
		server_redraw_session(s);
	} else
		server_status_session(s);

	environ_free(&env);

	if (args_has(args, 'P')) {
		paneidx = window_pane_index(wl->window, new_wp);
		ctx->print(ctx, "%s:%u.%u", s->name, wl->idx, paneidx);
	}
	return (0);

error:
	environ_free(&env);
	if (new_wp != NULL)
		window_remove_pane(w, new_wp);
	ctx->error(ctx, "create pane failed: %s", cause);
	xfree(cause);
//.........这里部分代码省略.........

int
cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct args		*args = self->args;
	struct session		*s, *old_s, *groupwith;
	struct window		*w;
	struct window_pane	*wp;
	struct environ		 env;
	struct termios		 tio, *tiop;
	struct passwd		*pw;
	const char		*newname, *target, *update, *cwd;
	char			*overrides, *cmd, *cause;
	int			 detached, idx;
	u_int			 sx, sy, i;

	newname = args_get(args, 's');
	if (newname != NULL && session_find(newname) != NULL) {
		ctx->error(ctx, "duplicate session: %s", newname);
		return (-1);
	}

	target = args_get(args, 't');
	if (target != NULL) {
		groupwith = cmd_find_session(ctx, target);
		if (groupwith == NULL)
			return (-1);
	} else
		groupwith = NULL;

	/*
	 * There are three cases:
	 *
	 * 1. If cmdclient is non-NULL, new-session has been called from the
	 *    command-line - cmdclient is to become a new attached, interactive
	 *    client. Unless -d is given, the terminal must be opened and then
	 *    the client sent MSG_READY.
	 *
	 * 2. If cmdclient is NULL, new-session has been called from an
	 *    existing client (such as a key binding).
	 *
	 * 3. Both are NULL, the command was in the configuration file. Treat
	 *    this as if -d was given even if it was not.
	 *
	 * In all cases, a new additional session needs to be created and
	 * (unless -d) set as the current session for the client.
	 */

	/* Set -d if no client. */
	detached = args_has(args, 'd');
	if (ctx->cmdclient == NULL && ctx->curclient == NULL)
		detached = 1;

	/*
	 * Save the termios settings, part of which is used for new windows in
	 * this session.
	 *
	 * This is read again with tcgetattr() rather than using tty.tio as if
	 * detached, tty_open won't be called. Because of this, it must be done
	 * before opening the terminal as that calls tcsetattr() to prepare for
	 * tmux taking over.
	 */
	if (ctx->cmdclient != NULL && ctx->cmdclient->tty.fd != -1) {
		if (tcgetattr(ctx->cmdclient->tty.fd, &tio) != 0)
			fatal("tcgetattr failed");
		tiop = &tio;
	} else
		tiop = NULL;

	/* Open the terminal if necessary. */
	if (!detached && ctx->cmdclient != NULL) {
		if (!(ctx->cmdclient->flags & CLIENT_TERMINAL)) {
			ctx->error(ctx, "not a terminal");
			return (-1);
		}

		overrides =
		    options_get_string(&global_s_options, "terminal-overrides");
		if (tty_open(&ctx->cmdclient->tty, overrides, &cause) != 0) {
			ctx->error(ctx, "open terminal failed: %s", cause);
			xfree(cause);
			return (-1);
		}
	}

	/* Get the new session working directory. */
	if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
		cwd = ctx->cmdclient->cwd;
	else {
		pw = getpwuid(getuid());
		if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
			cwd = pw->pw_dir;
		else
			cwd = "/";
	}

	/* Find new session size. */
	if (detached) {
		sx = 80;
		sy = 24;
	} else if (ctx->cmdclient != NULL) {
//.........这里部分代码省略.........