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/wait.h>
 #include <sys/uio.h>

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

 #include "tmux.h"

 static struct session	*server_next_session(struct session *);
 static void		 server_destroy_session_group(struct session *);

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

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

 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_contains(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_contains(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);
 	}
 }

 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_REDRAWBORDERS;
 	}
 }

 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 (*cmd == '\0' || 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(c->peer, MSG_LOCK, -1, cmd, strlen(cmd) + 1);
 }

 void
 server_kill_pane(struct window_pane *wp)
 {
 	struct window	*w = wp->window;

 	if (window_count_panes(w) == 1) {
 		server_kill_window(w, 1);
 		recalculate_sizes();
 	} else {
 		server_unzoom_window(w);
 		server_client_remove_pane(wp);
 		layout_close_pane(wp);
 		window_remove_pane(w, wp);
 		server_redraw_window(w);
 	}
 }

 void
 server_kill_window(struct window *w, int renumber)
 {
 	struct session	*s, *s1;
 	struct winlink	*wl;

 	RB_FOREACH_SAFE(s, sessions, &sessions, s1) {
 		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 (renumber)
 			server_renumber_session(s);
 	}
 	recalculate_sizes();
 }

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

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

 void
 server_renumber_all(void)
 {
 	struct session	*s;

 	RB_FOREACH(s, sessions, &sessions)
 		server_renumber_session(s);
 }

 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_contains(src);
 	dstsg = session_group_contains(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_session_window("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 notify)
 {
 	struct window		*w = wp->window;
 	struct screen_write_ctx	 ctx;
 	struct grid_cell	 gc;
 	time_t			 t;
 	char			 tim[26];
 	int			 remain_on_exit;

 	if (wp->fd != -1) {
 #ifdef HAVE_UTEMPTER
 		utempter_remove_record(wp->fd);
 #endif
 		bufferevent_free(wp->event);
 		wp->event = NULL;
 		close(wp->fd);
 		wp->fd = -1;
 	}

 	remain_on_exit = options_get_number(wp->options, "remain-on-exit");
 	if (remain_on_exit != 0 && (~wp->flags & PANE_STATUSREADY))
 		return;
 	switch (remain_on_exit) {
 	case 0:
 		break;
 	case 2:
 		if (WIFEXITED(wp->status) && WEXITSTATUS(wp->status) == 0)
 			break;
 		/* FALLTHROUGH */
 	case 1:
 		if (wp->flags & PANE_STATUSDRAWN)
 			return;
 		wp->flags |= PANE_STATUSDRAWN;

 		if (notify)
 			notify_pane("pane-died", wp);

 		screen_write_start_pane(&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, 0);
 		screen_write_linefeed(&ctx, 1, 8);
 		memcpy(&gc, &grid_default_cell, sizeof gc);

 		time(&t);
 		ctime_r(&t, tim);
 		tim[strcspn(tim, "\n")] = '\0';

 		if (WIFEXITED(wp->status)) {
 			screen_write_nputs(&ctx, -1, &gc,
 			    "Pane is dead (status %d, %s)",
 			    WEXITSTATUS(wp->status),
 			    tim);
 		} else if (WIFSIGNALED(wp->status)) {
 			screen_write_nputs(&ctx, -1, &gc,
 			    "Pane is dead (signal %s, %s)",
 			    sig2name(WTERMSIG(wp->status)),
 			    tim);
 		}

 		screen_write_stop(&ctx);
 		wp->flags |= PANE_REDRAW;
 		return;
 	}

 	if (notify)
 		notify_pane("pane-exited", wp);

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

 	if (TAILQ_EMPTY(&w->panes))
 		server_kill_window(w, 1);
 	else
 		server_redraw_window(w);
 }

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

 	if ((sg = session_group_contains(s)) == NULL)
 		server_destroy_session(s);
 	else {
 		TAILQ_FOREACH_SAFE(s, &sg->sessions, gentry, s1) {
 			server_destroy_session(s);
 			session_destroy(s, 1, __func__);
 		}
 	}
 }

 static struct session *
 server_next_session(struct session *s)
 {
 	struct session *s_loop, *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);
 }

 static struct session *
 server_next_detached_session(struct session *s)
 {
 	struct session *s_loop, *s_out = NULL;

 	RB_FOREACH(s_loop, sessions, &sessions) {
 		if (s_loop == s || s_loop->attached)
 			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;
 	int		 detach_on_destroy;

 	detach_on_destroy = options_get_number(s->options, "detach-on-destroy");
 	if (detach_on_destroy == 0)
 		s_new = server_next_session(s);
 	else if (detach_on_destroy == 2)
 		s_new = server_next_detached_session(s);
 	else
 		s_new = NULL;
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != s)
 			continue;
 		server_client_set_session(c, NULL);
 		if (s_new == NULL)
 			c->flags |= CLIENT_EXIT;
 	}
 	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->attached != 0)
 			continue;
 		if (options_get_number (s->options, "destroy-unattached"))
 			session_destroy(s, 1, __func__);
 	}
 }

 void
 server_unzoom_window(struct window *w)
 {
 	if (window_unzoom(w) == 0)
 		server_redraw_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/wait.h>
	#include <sys/uio.h>

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

	#include "tmux.h"

	static struct session server_next_session(struct session );
	static void server_destroy_session_group(struct session *);

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

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

	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_contains(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_contains(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);
	}
	}

	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_REDRAWBORDERS;
	}
	}

	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 (*cmd == '\0' \|\| 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(c->peer, MSG_LOCK, -1, cmd, strlen(cmd) + 1);
	}

	void
	server_kill_pane(struct window_pane *wp)
	{
	struct window *w = wp->window;

	if (window_count_panes(w) == 1) {
	server_kill_window(w, 1);
	recalculate_sizes();
	} else {
	server_unzoom_window(w);
	server_client_remove_pane(wp);
	layout_close_pane(wp);
	window_remove_pane(w, wp);
	server_redraw_window(w);
	}
	}

	void
	server_kill_window(struct window *w, int renumber)
	{
	struct session s, s1;
	struct winlink *wl;

	RB_FOREACH_SAFE(s, sessions, &sessions, s1) {
	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 (renumber)
	server_renumber_session(s);
	}
	recalculate_sizes();
	}

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

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

	void
	server_renumber_all(void)
	{
	struct session *s;

	RB_FOREACH(s, sessions, &sessions)
	server_renumber_session(s);
	}

	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_contains(src);
	dstsg = session_group_contains(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_session_window("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 notify)
	{
	struct window *w = wp->window;
	struct screen_write_ctx ctx;
	struct grid_cell gc;
	time_t t;
	char tim[26];
	int remain_on_exit;

	if (wp->fd != -1) {
	#ifdef HAVE_UTEMPTER
	utempter_remove_record(wp->fd);
	#endif
	bufferevent_free(wp->event);
	wp->event = NULL;
	close(wp->fd);
	wp->fd = -1;
	}

	remain_on_exit = options_get_number(wp->options, "remain-on-exit");
	if (remain_on_exit != 0 && (~wp->flags & PANE_STATUSREADY))
	return;
	switch (remain_on_exit) {
	case 0:
	break;
	case 2:
	if (WIFEXITED(wp->status) && WEXITSTATUS(wp->status) == 0)
	break;
	/* FALLTHROUGH */
	case 1:
	if (wp->flags & PANE_STATUSDRAWN)
	return;
	wp->flags \|= PANE_STATUSDRAWN;

	if (notify)
	notify_pane("pane-died", wp);

	screen_write_start_pane(&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, 0);
	screen_write_linefeed(&ctx, 1, 8);
	memcpy(&gc, &grid_default_cell, sizeof gc);

	time(&t);
	ctime_r(&t, tim);
	tim[strcspn(tim, "\n")] = '\0';

	if (WIFEXITED(wp->status)) {
	screen_write_nputs(&ctx, -1, &gc,
	"Pane is dead (status %d, %s)",
	WEXITSTATUS(wp->status),
	tim);
	} else if (WIFSIGNALED(wp->status)) {
	screen_write_nputs(&ctx, -1, &gc,
	"Pane is dead (signal %s, %s)",
	sig2name(WTERMSIG(wp->status)),
	tim);
	}

	screen_write_stop(&ctx);
	wp->flags \|= PANE_REDRAW;
	return;
	}

	if (notify)
	notify_pane("pane-exited", wp);

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

	if (TAILQ_EMPTY(&w->panes))
	server_kill_window(w, 1);
	else
	server_redraw_window(w);
	}

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

	if ((sg = session_group_contains(s)) == NULL)
	server_destroy_session(s);
	else {
	TAILQ_FOREACH_SAFE(s, &sg->sessions, gentry, s1) {
	server_destroy_session(s);
	session_destroy(s, 1, __func__);
	}
	}
	}

	static struct session *
	server_next_session(struct session *s)
	{
	struct session s_loop, 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);
	}

	static struct session *
	server_next_detached_session(struct session *s)
	{
	struct session s_loop, s_out = NULL;

	RB_FOREACH(s_loop, sessions, &sessions) {
	if (s_loop == s \|\| s_loop->attached)
	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;
	int detach_on_destroy;

	detach_on_destroy = options_get_number(s->options, "detach-on-destroy");
	if (detach_on_destroy == 0)
	s_new = server_next_session(s);
	else if (detach_on_destroy == 2)
	s_new = server_next_detached_session(s);
	else
	s_new = NULL;
	TAILQ_FOREACH(c, &clients, entry) {
	if (c->session != s)
	continue;
	server_client_set_session(c, NULL);
	if (s_new == NULL)
	c->flags \|= CLIENT_EXIT;
	}
	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->attached != 0)
	continue;
	if (options_get_number (s->options, "destroy-unattached"))
	session_destroy(s, 1, __func__);
	}
	}

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