server-fn.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include <sys/types.h>
 #include <sys/queue.h>
 #include <sys/uio.h>

 #include <imsg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>

 #include "tmux.h"

 struct session *server_next_session(struct session *);
 void		server_callback_identify(int, short, void *);

 void
 server_fill_environ(struct session *s, struct environ *env)
 {
 	char	*term;
 	u_int	 idx;
 	long	 pid;

 	if (s != NULL) {
 		term = options_get_string(global_options, "default-terminal");
 		environ_set(env, "TERM", "%s", term);

 		idx = s->id;
 	} else
 		idx = (u_int)-1;
 	pid = getpid();
 	environ_set(env, "TMUX", "%s,%ld,%u", socket_path, pid, idx);
 }

 void
 server_redraw_client(struct client *c)
 {
 	c->flags |= CLIENT_REDRAW;
 }

 void
 server_status_client(struct client *c)
 {
 	c->flags |= CLIENT_STATUS;
 }

 void
 server_redraw_session(struct session *s)
 {
 	struct client	*c;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session == s)
 			server_redraw_client(c);
 	}
 }

 void
 server_redraw_session_group(struct session *s)
 {
 	struct session_group	*sg;

 	if ((sg = session_group_find(s)) == NULL)
 		server_redraw_session(s);
 	else {
 		TAILQ_FOREACH(s, &sg->sessions, gentry)
 			server_redraw_session(s);
 	}
 }

 void
 server_status_session(struct session *s)
 {
 	struct client	*c;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session == s)
 			server_status_client(c);
 	}
 }

 void
 server_status_session_group(struct session *s)
 {
 	struct session_group	*sg;

 	if ((sg = session_group_find(s)) == NULL)
 		server_status_session(s);
 	else {
 		TAILQ_FOREACH(s, &sg->sessions, gentry)
 			server_status_session(s);
 	}
 }

 void
 server_redraw_window(struct window *w)
 {
 	struct client	*c;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL && c->session->curw->window == w)
 			server_redraw_client(c);
 	}
 	w->flags |= WINDOW_REDRAW;
 }

 void
 server_redraw_window_borders(struct window *w)
 {
 	struct client	*c;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL && c->session->curw->window == w)
 			c->flags |= CLIENT_BORDERS;
 	}
 }

 void
 server_status_window(struct window *w)
 {
 	struct session	*s;

 	/*
 	 * This is slightly different. We want to redraw the status line of any
 	 * clients containing this window rather than anywhere it is the
 	 * current window.
 	 */

 	RB_FOREACH(s, sessions, &sessions) {
 		if (session_has(s, w))
 			server_status_session(s);
 	}
 }

 void
 server_lock(void)
 {
 	struct client	*c;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL)
 			server_lock_client(c);
 	}
 }

 void
 server_lock_session(struct session *s)
 {
 	struct client	*c;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session == s)
 			server_lock_client(c);
 	}
 }

 void
 server_lock_client(struct client *c)
 {
 	const char	*cmd;

 	if (c->flags & CLIENT_CONTROL)
 		return;

 	if (c->flags & CLIENT_SUSPENDED)
 		return;

 	cmd = options_get_string(c->session->options, "lock-command");
 	if (strlen(cmd) + 1 > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
 		return;

 	tty_stop_tty(&c->tty);
 	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
 	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));
 	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_E3));

 	c->flags |= CLIENT_SUSPENDED;
 	proc_send_s(c->peer, MSG_LOCK, cmd);
 }

 void
 server_kill_window(struct window *w)
 {
 	struct session		*s, *next_s, *target_s;
 	struct session_group	*sg;
 	struct winlink		*wl;

 	next_s = RB_MIN(sessions, &sessions);
 	while (next_s != NULL) {
 		s = next_s;
 		next_s = RB_NEXT(sessions, &sessions, s);

 		if (!session_has(s, w))
 			continue;
 		server_unzoom_window(w);
 		while ((wl = winlink_find_by_window(&s->windows, w)) != NULL) {
 			if (session_detach(s, wl)) {
 				server_destroy_session_group(s);
 				break;
 			} else
 				server_redraw_session_group(s);
 		}

 		if (options_get_number(s->options, "renumber-windows")) {
 			if ((sg = session_group_find(s)) != NULL) {
 				TAILQ_FOREACH(target_s, &sg->sessions, gentry)
 					session_renumber_windows(target_s);
 			} else
 				session_renumber_windows(s);
 		}
 	}
 	recalculate_sizes();
 }

 int
 server_link_window(struct session *src, struct winlink *srcwl,
     struct session *dst, int dstidx, int killflag, int selectflag,
     char **cause)
 {
 	struct winlink		*dstwl;
 	struct session_group	*srcsg, *dstsg;

 	srcsg = session_group_find(src);
 	dstsg = session_group_find(dst);
 	if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
 		xasprintf(cause, "sessions are grouped");
 		return (-1);
 	}

 	dstwl = NULL;
 	if (dstidx != -1)
 		dstwl = winlink_find_by_index(&dst->windows, dstidx);
 	if (dstwl != NULL) {
 		if (dstwl->window == srcwl->window) {
 			xasprintf(cause, "same index: %d", dstidx);
 			return (-1);
 		}
 		if (killflag) {
 			/*
 			 * Can't use session_detach as it will destroy session
 			 * if this makes it empty.
 			 */
 			notify_window_unlinked(dst, dstwl->window);
 			dstwl->flags &= ~WINLINK_ALERTFLAGS;
 			winlink_stack_remove(&dst->lastw, dstwl);
 			winlink_remove(&dst->windows, dstwl);

 			/* Force select/redraw if current. */
 			if (dstwl == dst->curw) {
 				selectflag = 1;
 				dst->curw = NULL;
 			}
 		}
 	}

 	if (dstidx == -1)
 		dstidx = -1 - options_get_number(dst->options, "base-index");
 	dstwl = session_attach(dst, srcwl->window, dstidx, cause);
 	if (dstwl == NULL)
 		return (-1);

 	if (selectflag)
 		session_select(dst, dstwl->idx);
 	server_redraw_session_group(dst);

 	return (0);
 }

 void
 server_unlink_window(struct session *s, struct winlink *wl)
 {
 	if (session_detach(s, wl))
 		server_destroy_session_group(s);
 	else
 		server_redraw_session_group(s);
 }

 void
 server_destroy_pane(struct window_pane *wp, int hooks)
 {
 	struct window		*w = wp->window;
 	int			 old_fd;
 	struct screen_write_ctx	 ctx;
 	struct grid_cell	 gc;
 	struct cmd_find_state	 fs;

 	old_fd = wp->fd;
 	if (wp->fd != -1) {
 		bufferevent_free(wp->event);
 		close(wp->fd);
 		wp->fd = -1;
 	}

 	if (options_get_number(w->options, "remain-on-exit")) {
 		if (old_fd == -1)
 			return;
 		screen_write_start(&ctx, wp, &wp->base);
 		screen_write_scrollregion(&ctx, 0, screen_size_y(ctx.s) - 1);
 		screen_write_cursormove(&ctx, 0, screen_size_y(ctx.s) - 1);
 		screen_write_linefeed(&ctx, 1);
 		memcpy(&gc, &grid_default_cell, sizeof gc);
 		gc.attr |= GRID_ATTR_BRIGHT;
 		screen_write_puts(&ctx, &gc, "Pane is dead");
 		screen_write_stop(&ctx);
 		wp->flags |= PANE_REDRAW;

 		if (hooks && cmd_find_from_pane(&fs, wp) == 0)
 			hooks_run(hooks_get(fs.s), NULL, &fs, "pane-died");
 		return;
 	}

 	server_unzoom_window(w);
 	layout_close_pane(wp);
 	window_remove_pane(w, wp);

 	if (hooks && cmd_find_from_window(&fs, w) == 0)
 		hooks_run(hooks_get(fs.s), NULL, &fs, "pane-exited");

 	if (TAILQ_EMPTY(&w->panes))
 		server_kill_window(w);
 	else
 		server_redraw_window(w);
 }

 void
 server_destroy_session_group(struct session *s)
 {
 	struct session_group	*sg;
 	struct session		*s1;

 	if ((sg = session_group_find(s)) == NULL)
 		server_destroy_session(s);
 	else {
 		TAILQ_FOREACH_SAFE(s, &sg->sessions, gentry, s1) {
 			server_destroy_session(s);
 			session_destroy(s);
 		}
 	}
 }

 struct session *
 server_next_session(struct session *s)
 {
 	struct session *s_loop, *s_out;

 	s_out = NULL;
 	RB_FOREACH(s_loop, sessions, &sessions) {
 		if (s_loop == s)
 			continue;
 		if (s_out == NULL ||
 		    timercmp(&s_loop->activity_time, &s_out->activity_time, <))
 			s_out = s_loop;
 	}
 	return (s_out);
 }

 void
 server_destroy_session(struct session *s)
 {
 	struct client	*c;
 	struct session	*s_new;

 	if (!options_get_number(s->options, "detach-on-destroy"))
 		s_new = server_next_session(s);
 	else
 		s_new = NULL;

 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != s)
 			continue;
 		if (s_new == NULL) {
 			c->session = NULL;
 			c->flags |= CLIENT_EXIT;
 		} else {
 			c->last_session = NULL;
 			c->session = s_new;
 			server_client_set_key_table(c, NULL);
 			status_timer_start(c);
 			notify_attached_session_changed(c);
 			session_update_activity(s_new, NULL);
 			gettimeofday(&s_new->last_attached_time, NULL);
 			server_redraw_client(c);
 			alerts_check_session(s_new);
 		}
 	}
 	recalculate_sizes();
 }

 void
 server_check_unattached(void)
 {
 	struct session	*s;

 	/*
 	 * If any sessions are no longer attached and have destroy-unattached
 	 * set, collect them.
 	 */
 	RB_FOREACH(s, sessions, &sessions) {
 		if (!(s->flags & SESSION_UNATTACHED))
 			continue;
 		if (options_get_number (s->options, "destroy-unattached"))
 			session_destroy(s);
 	}
 }

 void
 server_set_identify(struct client *c)
 {
 	struct timeval	tv;
 	int		delay;

 	delay = options_get_number(c->session->options, "display-panes-time");
 	tv.tv_sec = delay / 1000;
 	tv.tv_usec = (delay % 1000) * 1000L;

 	if (event_initialized(&c->identify_timer))
 		evtimer_del(&c->identify_timer);
 	evtimer_set(&c->identify_timer, server_callback_identify, c);
 	evtimer_add(&c->identify_timer, &tv);

 	c->flags |= CLIENT_IDENTIFY;
 	c->tty.flags |= (TTY_FREEZE|TTY_NOCURSOR);
 	server_redraw_client(c);
 }

 void
 server_clear_identify(struct client *c)
 {
 	if (c->flags & CLIENT_IDENTIFY) {
 		c->flags &= ~CLIENT_IDENTIFY;
 		c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
 		server_redraw_client(c);
 	}
 }

 void
 server_callback_identify(__unused int fd, __unused short events, void *data)
 {
 	struct client	*c = data;

 	server_clear_identify(c);
 }

 /* Set stdin callback. */
 int
 server_set_stdin_callback(struct client *c, void (*cb)(struct client *, int,
     void *), void *cb_data, char **cause)
 {
 	if (c == NULL || c->session != NULL) {
 		*cause = xstrdup("no client with stdin");
 		return (-1);
 	}
 	if (c->flags & CLIENT_TERMINAL) {
 		*cause = xstrdup("stdin is a tty");
 		return (-1);
 	}
 	if (c->stdin_callback != NULL) {
 		*cause = xstrdup("stdin in use");
 		return (-1);
 	}

 	c->stdin_callback_data = cb_data;
 	c->stdin_callback = cb;

 	c->references++;

 	if (c->stdin_closed)
 		c->stdin_callback(c, 1, c->stdin_callback_data);

 	proc_send(c->peer, MSG_STDIN, -1, NULL, 0);

 	return (0);
 }

 void
 server_unzoom_window(struct window *w)
 {
 	if (window_unzoom(w) == 0) {
 		server_redraw_window(w);
 		server_status_window(w);
 	}
 }
	/* $OpenBSD$ */

	/*
	* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
	*
	* Permission to use, copy, modify, and distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
	* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
	* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include <sys/types.h>
	#include <sys/queue.h>
	#include <sys/uio.h>

	#include <imsg.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <unistd.h>

	#include "tmux.h"

	struct session server_next_session(struct session );
	void server_callback_identify(int, short, void *);

	void
	server_fill_environ(struct session s, struct environ env)
	{
	char *term;
	u_int idx;
	long pid;

	if (s != NULL) {
	term = options_get_string(global_options, "default-terminal");
	environ_set(env, "TERM", "%s", term);

	idx = s->id;
	} else
	idx = (u_int)-1;
	pid = getpid();
	environ_set(env, "TMUX", "%s,%ld,%u", socket_path, pid, idx);
	}

	void
	server_redraw_client(struct client *c)
	{
	c->flags \|= CLIENT_REDRAW;
	}

	void
	server_status_client(struct client *c)
	{
	c->flags \|= CLIENT_STATUS;
	}

	void
	server_redraw_session(struct session *s)
	{
	struct client *c;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session == s)
	server_redraw_client(c);
	}
	}

	void
	server_redraw_session_group(struct session *s)
	{
	struct session_group *sg;

	if ((sg = session_group_find(s)) == NULL)
	server_redraw_session(s);
	else {
	TAILQ_FOREACH(s, &sg->sessions, gentry)
	server_redraw_session(s);
	}
	}

	void
	server_status_session(struct session *s)
	{
	struct client *c;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session == s)
	server_status_client(c);
	}
	}

	void
	server_status_session_group(struct session *s)
	{
	struct session_group *sg;

	if ((sg = session_group_find(s)) == NULL)
	server_status_session(s);
	else {
	TAILQ_FOREACH(s, &sg->sessions, gentry)
	server_status_session(s);
	}
	}

	void
	server_redraw_window(struct window *w)
	{
	struct client *c;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session != NULL && c->session->curw->window == w)
	server_redraw_client(c);
	}
	w->flags \|= WINDOW_REDRAW;
	}

	void
	server_redraw_window_borders(struct window *w)
	{
	struct client *c;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session != NULL && c->session->curw->window == w)
	c->flags \|= CLIENT_BORDERS;
	}
	}

	void
	server_status_window(struct window *w)
	{
	struct session *s;

	/*
	* This is slightly different. We want to redraw the status line of any
	* clients containing this window rather than anywhere it is the
	* current window.
	*/

	RB_FOREACH(s, sessions, &sessions) {
	if (session_has(s, w))
	server_status_session(s);
	}
	}

	void
	server_lock(void)
	{
	struct client *c;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session != NULL)
	server_lock_client(c);
	}
	}

	void
	server_lock_session(struct session *s)
	{
	struct client *c;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session == s)
	server_lock_client(c);
	}
	}

	void
	server_lock_client(struct client *c)
	{
	const char *cmd;

	if (c->flags & CLIENT_CONTROL)
	return;

	if (c->flags & CLIENT_SUSPENDED)
	return;

	cmd = options_get_string(c->session->options, "lock-command");
	if (strlen(cmd) + 1 > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
	return;

	tty_stop_tty(&c->tty);
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_E3));

	c->flags \|= CLIENT_SUSPENDED;
	proc_send_s(c->peer, MSG_LOCK, cmd);
	}

	void
	server_kill_window(struct window *w)
	{
	struct session s, next_s, *target_s;
	struct session_group *sg;
	struct winlink *wl;

	next_s = RB_MIN(sessions, &sessions);
	while (next_s != NULL) {
	s = next_s;
	next_s = RB_NEXT(sessions, &sessions, s);

	if (!session_has(s, w))
	continue;
	server_unzoom_window(w);
	while ((wl = winlink_find_by_window(&s->windows, w)) != NULL) {
	if (session_detach(s, wl)) {
	server_destroy_session_group(s);
	break;
	} else
	server_redraw_session_group(s);
	}

	if (options_get_number(s->options, "renumber-windows")) {
	if ((sg = session_group_find(s)) != NULL) {
	TAILQ_FOREACH(target_s, &sg->sessions, gentry)
	session_renumber_windows(target_s);
	} else
	session_renumber_windows(s);
	}
	}
	recalculate_sizes();
	}

	int
	server_link_window(struct session src, struct winlink srcwl,
	struct session *dst, int dstidx, int killflag, int selectflag,
	char **cause)
	{
	struct winlink *dstwl;
	struct session_group srcsg, dstsg;

	srcsg = session_group_find(src);
	dstsg = session_group_find(dst);
	if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
	xasprintf(cause, "sessions are grouped");
	return (-1);
	}

	dstwl = NULL;
	if (dstidx != -1)
	dstwl = winlink_find_by_index(&dst->windows, dstidx);
	if (dstwl != NULL) {
	if (dstwl->window == srcwl->window) {
	xasprintf(cause, "same index: %d", dstidx);
	return (-1);
	}
	if (killflag) {
	/*
	* Can't use session_detach as it will destroy session
	* if this makes it empty.
	*/
	notify_window_unlinked(dst, dstwl->window);
	dstwl->flags &= ~WINLINK_ALERTFLAGS;
	winlink_stack_remove(&dst->lastw, dstwl);
	winlink_remove(&dst->windows, dstwl);

	/* Force select/redraw if current. */
	if (dstwl == dst->curw) {
	selectflag = 1;
	dst->curw = NULL;
	}
	}
	}

	if (dstidx == -1)
	dstidx = -1 - options_get_number(dst->options, "base-index");
	dstwl = session_attach(dst, srcwl->window, dstidx, cause);
	if (dstwl == NULL)
	return (-1);

	if (selectflag)
	session_select(dst, dstwl->idx);
	server_redraw_session_group(dst);

	return (0);
	}

	void
	server_unlink_window(struct session s, struct winlink wl)
	{
	if (session_detach(s, wl))
	server_destroy_session_group(s);
	else
	server_redraw_session_group(s);
	}

	void
	server_destroy_pane(struct window_pane *wp, int hooks)
	{
	struct window *w = wp->window;
	int old_fd;
	struct screen_write_ctx ctx;
	struct grid_cell gc;
	struct cmd_find_state fs;

	old_fd = wp->fd;
	if (wp->fd != -1) {
	bufferevent_free(wp->event);
	close(wp->fd);
	wp->fd = -1;
	}

	if (options_get_number(w->options, "remain-on-exit")) {
	if (old_fd == -1)
	return;
	screen_write_start(&ctx, wp, &wp->base);
	screen_write_scrollregion(&ctx, 0, screen_size_y(ctx.s) - 1);
	screen_write_cursormove(&ctx, 0, screen_size_y(ctx.s) - 1);
	screen_write_linefeed(&ctx, 1);
	memcpy(&gc, &grid_default_cell, sizeof gc);
	gc.attr \|= GRID_ATTR_BRIGHT;
	screen_write_puts(&ctx, &gc, "Pane is dead");
	screen_write_stop(&ctx);
	wp->flags \|= PANE_REDRAW;

	if (hooks && cmd_find_from_pane(&fs, wp) == 0)
	hooks_run(hooks_get(fs.s), NULL, &fs, "pane-died");
	return;
	}

	server_unzoom_window(w);
	layout_close_pane(wp);
	window_remove_pane(w, wp);

	if (hooks && cmd_find_from_window(&fs, w) == 0)
	hooks_run(hooks_get(fs.s), NULL, &fs, "pane-exited");

	if (TAILQ_EMPTY(&w->panes))
	server_kill_window(w);
	else
	server_redraw_window(w);
	}

	void
	server_destroy_session_group(struct session *s)
	{
	struct session_group *sg;
	struct session *s1;

	if ((sg = session_group_find(s)) == NULL)
	server_destroy_session(s);
	else {
	TAILQ_FOREACH_SAFE(s, &sg->sessions, gentry, s1) {
	server_destroy_session(s);
	session_destroy(s);
	}
	}
	}

	struct session *
	server_next_session(struct session *s)
	{
	struct session s_loop, s_out;

	s_out = NULL;
	RB_FOREACH(s_loop, sessions, &sessions) {
	if (s_loop == s)
	continue;
	if (s_out == NULL \|\|
	timercmp(&s_loop->activity_time, &s_out->activity_time, <))
	s_out = s_loop;
	}
	return (s_out);
	}

	void
	server_destroy_session(struct session *s)
	{
	struct client *c;
	struct session *s_new;

	if (!options_get_number(s->options, "detach-on-destroy"))
	s_new = server_next_session(s);
	else
	s_new = NULL;

	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session != s)
	continue;
	if (s_new == NULL) {
	c->session = NULL;
	c->flags \|= CLIENT_EXIT;
	} else {
	c->last_session = NULL;
	c->session = s_new;
	server_client_set_key_table(c, NULL);
	status_timer_start(c);
	notify_attached_session_changed(c);
	session_update_activity(s_new, NULL);
	gettimeofday(&s_new->last_attached_time, NULL);
	server_redraw_client(c);
	alerts_check_session(s_new);
	}
	}
	recalculate_sizes();
	}

	void
	server_check_unattached(void)
	{
	struct session *s;

	/*
	* If any sessions are no longer attached and have destroy-unattached
	* set, collect them.
	*/
	RB_FOREACH(s, sessions, &sessions) {
	if (!(s->flags & SESSION_UNATTACHED))
	continue;
	if (options_get_number (s->options, "destroy-unattached"))
	session_destroy(s);
	}
	}

	void
	server_set_identify(struct client *c)
	{
	struct timeval tv;
	int delay;

	delay = options_get_number(c->session->options, "display-panes-time");
	tv.tv_sec = delay / 1000;
	tv.tv_usec = (delay % 1000) * 1000L;

	if (event_initialized(&c->identify_timer))
	evtimer_del(&c->identify_timer);
	evtimer_set(&c->identify_timer, server_callback_identify, c);
	evtimer_add(&c->identify_timer, &tv);

	c->flags \|= CLIENT_IDENTIFY;
	c->tty.flags \|= (TTY_FREEZE\|TTY_NOCURSOR);
	server_redraw_client(c);
	}

	void
	server_clear_identify(struct client *c)
	{
	if (c->flags & CLIENT_IDENTIFY) {
	c->flags &= ~CLIENT_IDENTIFY;
	c->tty.flags &= ~(TTY_FREEZE\|TTY_NOCURSOR);
	server_redraw_client(c);
	}
	}

	void
	server_callback_identify(__unused int fd, __unused short events, void *data)
	{
	struct client *c = data;

	server_clear_identify(c);
	}

	/* Set stdin callback. */
	int
	server_set_stdin_callback(struct client c, void (cb)(struct client *, int,
	void ), void cb_data, char **cause)
	{
	if (c == NULL \|\| c->session != NULL) {
	*cause = xstrdup("no client with stdin");
	return (-1);
	}
	if (c->flags & CLIENT_TERMINAL) {
	*cause = xstrdup("stdin is a tty");
	return (-1);
	}
	if (c->stdin_callback != NULL) {
	*cause = xstrdup("stdin in use");
	return (-1);
	}

	c->stdin_callback_data = cb_data;
	c->stdin_callback = cb;

	c->references++;

	if (c->stdin_closed)
	c->stdin_callback(c, 1, c->stdin_callback_data);

	proc_send(c->peer, MSG_STDIN, -1, NULL, 0);

	return (0);
	}

	void
	server_unzoom_window(struct window *w)
	{
	if (window_unzoom(w) == 0) {
	server_redraw_window(w);
	server_status_window(w);
	}
	}