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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/tmux/session.c	Lines:	0	319	0.0 %
Date:	2017-11-13	Branches:	0	550	0.0 %


/* $OpenBSD: session.c,v 1.78 2017/11/02 18:27:35 nicm Exp $ */

/*
 * 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/time.h>

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

#include "tmux.h"

struct sessions		sessions;
static u_int		next_session_id;
struct session_groups	session_groups;

static void	session_free(int, short, void *);

static void	session_lock_timer(int, short, void *);

static struct winlink *session_next_alert(struct winlink *);
static struct winlink *session_previous_alert(struct winlink *);

static void	session_group_remove(struct session *);
static void	session_group_synchronize1(struct session *, struct session *);

RB_GENERATE(sessions, session, entry, session_cmp);

int
session_cmp(struct session *s1, struct session *s2)
{
	return (strcmp(s1->name, s2->name));
}

RB_GENERATE(session_groups, session_group, entry, session_group_cmp);

int
session_group_cmp(struct session_group *s1, struct session_group *s2)
{
	return (strcmp(s1->name, s2->name));
}

/*
 * Find if session is still alive. This is true if it is still on the global
 * sessions list.
 */
int
session_alive(struct session *s)
{
	struct session *s_loop;

	RB_FOREACH(s_loop, sessions, &sessions) {
		if (s_loop == s)
			return (1);
	}
	return (0);
}

/* Find session by name. */
struct session *
session_find(const char *name)
{
	struct session	s;

	s.name = (char *) name;
	return (RB_FIND(sessions, &sessions, &s));
}

/* Find session by id parsed from a string. */
struct session *
session_find_by_id_str(const char *s)
{
	const char	*errstr;
	u_int		 id;

	if (*s != '$')
		return (NULL);

	id = strtonum(s + 1, 0, UINT_MAX, &errstr);
	if (errstr != NULL)
		return (NULL);
	return (session_find_by_id(id));
}

/* Find session by id. */
struct session *
session_find_by_id(u_int id)
{
	struct session	*s;

	RB_FOREACH(s, sessions, &sessions) {
		if (s->id == id)
			return (s);
	}
	return (NULL);
}

/* Create a new session. */
struct session *
session_create(const char *prefix, const char *name, int argc, char **argv,
    const char *path, const char *cwd, struct environ *env, struct termios *tio,
    int idx, u_int sx, u_int sy, char **cause)
{
	struct session	*s;
	struct winlink	*wl;

	s = xcalloc(1, sizeof *s);
	s->references = 1;
	s->flags = 0;

	s->cwd = xstrdup(cwd);

	s->curw = NULL;
	TAILQ_INIT(&s->lastw);
	RB_INIT(&s->windows);

	s->environ = environ_create();
	if (env != NULL)
		environ_copy(env, s->environ);

	s->options = options_create(global_s_options);
	s->hooks = hooks_create(global_hooks);

	status_update_saved(s);

	s->tio = NULL;
	if (tio != NULL) {
		s->tio = xmalloc(sizeof *s->tio);
		memcpy(s->tio, tio, sizeof *s->tio);
	}

	s->sx = sx;
	s->sy = sy;

	if (name != NULL) {
		s->name = xstrdup(name);
		s->id = next_session_id++;
	} else {
		s->name = NULL;
		do {
			s->id = next_session_id++;
			free(s->name);
			if (prefix != NULL)
				xasprintf(&s->name, "%s-%u", prefix, s->id);
			else
				xasprintf(&s->name, "%u", s->id);
		} while (RB_FIND(sessions, &sessions, s) != NULL);
	}
	RB_INSERT(sessions, &sessions, s);

	log_debug("new session %s $%u", s->name, s->id);

	if (gettimeofday(&s->creation_time, NULL) != 0)
		fatal("gettimeofday failed");
	session_update_activity(s, &s->creation_time);

	if (argc >= 0) {
		wl = session_new(s, NULL, argc, argv, path, cwd, idx, cause);
		if (wl == NULL) {
			session_destroy(s, __func__);
			return (NULL);
		}
		session_select(s, RB_ROOT(&s->windows)->idx);
	}

	log_debug("session %s created", s->name);

	return (s);
}

/* Add a reference to a session. */
void
session_add_ref(struct session *s, const char *from)
{
	s->references++;
	log_debug("%s: %s %s, now %d", __func__, s->name, from, s->references);
}

/* Remove a reference from a session. */
void
session_remove_ref(struct session *s, const char *from)
{
	s->references--;
	log_debug("%s: %s %s, now %d", __func__, s->name, from, s->references);

	if (s->references == 0)
		event_once(-1, EV_TIMEOUT, session_free, s, NULL);
}

/* Free session. */
static void
session_free(__unused int fd, __unused short events, void *arg)
{
	struct session	*s = arg;

	log_debug("session %s freed (%d references)", s->name, s->references);

	if (s->references == 0) {
		environ_free(s->environ);

		options_free(s->options);
		hooks_free(s->hooks);

		free(s->name);
		free(s);
	}
}

/* Destroy a session. */
void
session_destroy(struct session *s, const char *from)
{
	struct winlink	*wl;

	log_debug("session %s destroyed (%s)", s->name, from);
	s->curw = NULL;

	RB_REMOVE(sessions, &sessions, s);
	notify_session("session-closed", s);

	free(s->tio);

	if (event_initialized(&s->lock_timer))
		event_del(&s->lock_timer);

	session_group_remove(s);

	while (!TAILQ_EMPTY(&s->lastw))
		winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
	while (!RB_EMPTY(&s->windows)) {
		wl = RB_ROOT(&s->windows);
		notify_session_window("window-unlinked", s, wl->window);
		winlink_remove(&s->windows, wl);
	}

	free((void *)s->cwd);

	session_remove_ref(s, __func__);
}

/* Check a session name is valid: not empty and no colons or periods. */
int
session_check_name(const char *name)
{
	return (*name != '\0' && name[strcspn(name, ":.")] == '\0');
}

/* Lock session if it has timed out. */
static void
session_lock_timer(__unused int fd, __unused short events, void *arg)
{
	struct session	*s = arg;

	if (s->flags & SESSION_UNATTACHED)
		return;

	log_debug("session %s locked, activity time %lld", s->name,
	    (long long)s->activity_time.tv_sec);

	server_lock_session(s);
	recalculate_sizes();
}

/* Update activity time. */
void
session_update_activity(struct session *s, struct timeval *from)
{
	struct timeval	*last = &s->last_activity_time;
	struct timeval	 tv;

	memcpy(last, &s->activity_time, sizeof *last);
	if (from == NULL)
		gettimeofday(&s->activity_time, NULL);
	else
		memcpy(&s->activity_time, from, sizeof s->activity_time);

	log_debug("session %s activity %lld.%06d (last %lld.%06d)", s->name,
	    (long long)s->activity_time.tv_sec, (int)s->activity_time.tv_usec,
	    (long long)last->tv_sec, (int)last->tv_usec);

	if (evtimer_initialized(&s->lock_timer))
		evtimer_del(&s->lock_timer);
	else
		evtimer_set(&s->lock_timer, session_lock_timer, s);

	if (~s->flags & SESSION_UNATTACHED) {
		timerclear(&tv);
		tv.tv_sec = options_get_number(s->options, "lock-after-time");
		if (tv.tv_sec != 0)
			evtimer_add(&s->lock_timer, &tv);
	}
}

/* Find the next usable session. */
struct session *
session_next_session(struct session *s)
{
	struct session *s2;

	if (RB_EMPTY(&sessions) || !session_alive(s))
		return (NULL);

	s2 = RB_NEXT(sessions, &sessions, s);
	if (s2 == NULL)
		s2 = RB_MIN(sessions, &sessions);
	if (s2 == s)
		return (NULL);
	return (s2);
}

/* Find the previous usable session. */
struct session *
session_previous_session(struct session *s)
{
	struct session *s2;

	if (RB_EMPTY(&sessions) || !session_alive(s))
		return (NULL);

	s2 = RB_PREV(sessions, &sessions, s);
	if (s2 == NULL)
		s2 = RB_MAX(sessions, &sessions);
	if (s2 == s)
		return (NULL);
	return (s2);
}

/* Create a new window on a session. */
struct winlink *
session_new(struct session *s, const char *name, int argc, char **argv,
    const char *path, const char *cwd, int idx, char **cause)
{
	struct window	*w;
	struct winlink	*wl;
	struct environ	*env;
	const char	*shell;
	u_int		 hlimit;

	if ((wl = winlink_add(&s->windows, idx)) == NULL) {
		xasprintf(cause, "index in use: %d", idx);
		return (NULL);
	}
	wl->session = s;

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

	hlimit = options_get_number(s->options, "history-limit");
	env = environ_for_session(s, 0);
	w = window_create_spawn(name, argc, argv, path, shell, cwd, env, s->tio,
	    s->sx, s->sy, hlimit, cause);
	if (w == NULL) {
		winlink_remove(&s->windows, wl);
		environ_free(env);
		return (NULL);
	}
	winlink_set_window(wl, w);
	environ_free(env);
	notify_session_window("window-linked", s, w);

	session_group_synchronize_from(s);
	return (wl);
}

/* Attach a window to a session. */
struct winlink *
session_attach(struct session *s, struct window *w, int idx, char **cause)
{
	struct winlink	*wl;

	if ((wl = winlink_add(&s->windows, idx)) == NULL) {
		xasprintf(cause, "index in use: %d", idx);
		return (NULL);
	}
	wl->session = s;
	winlink_set_window(wl, w);
	notify_session_window("window-linked", s, w);

	session_group_synchronize_from(s);
	return (wl);
}

/* Detach a window from a session. */
int
session_detach(struct session *s, struct winlink *wl)
{
	if (s->curw == wl &&
	    session_last(s) != 0 &&
	    session_previous(s, 0) != 0)
		session_next(s, 0);

	wl->flags &= ~WINLINK_ALERTFLAGS;
	notify_session_window("window-unlinked", s, wl->window);
	winlink_stack_remove(&s->lastw, wl);
	winlink_remove(&s->windows, wl);

	session_group_synchronize_from(s);

	if (RB_EMPTY(&s->windows)) {
		session_destroy(s, __func__);
		return (1);
	}
	return (0);
}

/* Return if session has window. */
int
session_has(struct session *s, struct window *w)
{
	struct winlink	*wl;

	TAILQ_FOREACH(wl, &w->winlinks, wentry) {
		if (wl->session == s)
			return (1);
	}
	return (0);
}

/*
 * Return 1 if a window is linked outside this session (not including session
 * groups). The window must be in this session!
 */
int
session_is_linked(struct session *s, struct window *w)
{
	struct session_group	*sg;

	if ((sg = session_group_contains(s)) != NULL)
		return (w->references != session_group_count(sg));
	return (w->references != 1);
}

static struct winlink *
session_next_alert(struct winlink *wl)
{
	while (wl != NULL) {
		if (wl->flags & WINLINK_ALERTFLAGS)
			break;
		wl = winlink_next(wl);
	}
	return (wl);
}

/* Move session to next window. */
int
session_next(struct session *s, int alert)
{
	struct winlink	*wl;

	if (s->curw == NULL)
		return (-1);

	wl = winlink_next(s->curw);
	if (alert)
		wl = session_next_alert(wl);
	if (wl == NULL) {
		wl = RB_MIN(winlinks, &s->windows);
		if (alert && ((wl = session_next_alert(wl)) == NULL))
			return (-1);
	}
	return (session_set_current(s, wl));
}

static struct winlink *
session_previous_alert(struct winlink *wl)
{
	while (wl != NULL) {
		if (wl->flags & WINLINK_ALERTFLAGS)
			break;
		wl = winlink_previous(wl);
	}
	return (wl);
}

/* Move session to previous window. */
int
session_previous(struct session *s, int alert)
{
	struct winlink	*wl;

	if (s->curw == NULL)
		return (-1);

	wl = winlink_previous(s->curw);
	if (alert)
		wl = session_previous_alert(wl);
	if (wl == NULL) {
		wl = RB_MAX(winlinks, &s->windows);
		if (alert && (wl = session_previous_alert(wl)) == NULL)
			return (-1);
	}
	return (session_set_current(s, wl));
}

/* Move session to specific window. */
int
session_select(struct session *s, int idx)
{
	struct winlink	*wl;

	wl = winlink_find_by_index(&s->windows, idx);
	return (session_set_current(s, wl));
}

/* Move session to last used window. */
int
session_last(struct session *s)
{
	struct winlink	*wl;

	wl = TAILQ_FIRST(&s->lastw);
	if (wl == NULL)
		return (-1);
	if (wl == s->curw)
		return (1);

	return (session_set_current(s, wl));
}

/* Set current winlink to wl .*/
int
session_set_current(struct session *s, struct winlink *wl)
{
	if (wl == NULL)
		return (-1);
	if (wl == s->curw)
		return (1);

	winlink_stack_remove(&s->lastw, wl);
	winlink_stack_push(&s->lastw, s->curw);
	s->curw = wl;
	winlink_clear_flags(wl);
	window_update_activity(wl->window);
	notify_session("session-window-changed", s);
	return (0);
}

/* Find the session group containing a session. */
struct session_group *
session_group_contains(struct session *target)
{
	struct session_group	*sg;
	struct session		*s;

	RB_FOREACH(sg, session_groups, &session_groups) {
		TAILQ_FOREACH(s, &sg->sessions, gentry) {
			if (s == target)
				return (sg);
		}
	}
	return (NULL);
}

/* Find session group by name. */
struct session_group *
session_group_find(const char *name)
{
	struct session_group	sg;

	sg.name = name;
	return (RB_FIND(session_groups, &session_groups, &sg));
}

/* Create a new session group. */
struct session_group *
session_group_new(const char *name)
{
	struct session_group	*sg;

	if ((sg = session_group_find(name)) != NULL)
		return (sg);

	sg = xcalloc(1, sizeof *sg);
	sg->name = xstrdup(name);
	TAILQ_INIT(&sg->sessions);

	RB_INSERT(session_groups, &session_groups, sg);
	return (sg);
}

/* Add a session to a session group. */
void
session_group_add(struct session_group *sg, struct session *s)
{
	if (session_group_contains(s) == NULL)
		TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
}

/* Remove a session from its group and destroy the group if empty. */
static void
session_group_remove(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_contains(s)) == NULL)
		return;
	TAILQ_REMOVE(&sg->sessions, s, gentry);
	if (TAILQ_EMPTY(&sg->sessions)) {
		RB_REMOVE(session_groups, &session_groups, sg);
		free(sg);
	}
}

/* Count number of sessions in session group. */
u_int
session_group_count(struct session_group *sg)
{
	struct session	*s;
	u_int		 n;

	n = 0;
	TAILQ_FOREACH(s, &sg->sessions, gentry)
	    n++;
	return (n);
}

/* Synchronize a session to its session group. */
void
session_group_synchronize_to(struct session *s)
{
	struct session_group	*sg;
	struct session		*target;

	if ((sg = session_group_contains(s)) == NULL)
		return;

	target = NULL;
	TAILQ_FOREACH(target, &sg->sessions, gentry) {
		if (target != s)
			break;
	}
	if (target != NULL)
		session_group_synchronize1(target, s);
}

/* Synchronize a session group to a session. */
void
session_group_synchronize_from(struct session *target)
{
	struct session_group	*sg;
	struct session		*s;

	if ((sg = session_group_contains(target)) == NULL)
		return;

	TAILQ_FOREACH(s, &sg->sessions, gentry) {
		if (s != target)
			session_group_synchronize1(target, s);
	}
}

/*
 * Synchronize a session with a target session. This means destroying all
 * winlinks then recreating them, then updating the current window, last window
 * stack and alerts.
 */
static void
session_group_synchronize1(struct session *target, struct session *s)
{
	struct winlinks		 old_windows, *ww;
	struct winlink_stack	 old_lastw;
	struct winlink		*wl, *wl2;

	/* Don't do anything if the session is empty (it'll be destroyed). */
	ww = &target->windows;
	if (RB_EMPTY(ww))
		return;

	/* If the current window has vanished, move to the next now. */
	if (s->curw != NULL &&
	    winlink_find_by_index(ww, s->curw->idx) == NULL &&
	    session_last(s) != 0 && session_previous(s, 0) != 0)
		session_next(s, 0);

	/* Save the old pointer and reset it. */
	memcpy(&old_windows, &s->windows, sizeof old_windows);
	RB_INIT(&s->windows);

	/* Link all the windows from the target. */
	RB_FOREACH(wl, winlinks, ww) {
		wl2 = winlink_add(&s->windows, wl->idx);
		wl2->session = s;
		winlink_set_window(wl2, wl->window);
		notify_session_window("window-linked", s, wl2->window);
		wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
	}

	/* Fix up the current window. */
	if (s->curw != NULL)
		s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
	else
		s->curw = winlink_find_by_index(&s->windows, target->curw->idx);

	/* Fix up the last window stack. */
	memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
	TAILQ_INIT(&s->lastw);
	TAILQ_FOREACH(wl, &old_lastw, sentry) {
		wl2 = winlink_find_by_index(&s->windows, wl->idx);
		if (wl2 != NULL)
			TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
	}

	/* Then free the old winlinks list. */
	while (!RB_EMPTY(&old_windows)) {
		wl = RB_ROOT(&old_windows);
		wl2 = winlink_find_by_window_id(&s->windows, wl->window->id);
		if (wl2 == NULL)
			notify_session_window("window-unlinked", s, wl->window);
		winlink_remove(&old_windows, wl);
	}
}

/* Renumber the windows across winlinks attached to a specific session. */
void
session_renumber_windows(struct session *s)
{
	struct winlink		*wl, *wl1, *wl_new;
	struct winlinks		 old_wins;
	struct winlink_stack	 old_lastw;
	int			 new_idx, new_curw_idx;

	/* Save and replace old window list. */
	memcpy(&old_wins, &s->windows, sizeof old_wins);
	RB_INIT(&s->windows);

	/* Start renumbering from the base-index if it's set. */
	new_idx = options_get_number(s->options, "base-index");
	new_curw_idx = 0;

	/* Go through the winlinks and assign new indexes. */
	RB_FOREACH(wl, winlinks, &old_wins) {
		wl_new = winlink_add(&s->windows, new_idx);
		wl_new->session = s;
		winlink_set_window(wl_new, wl->window);
		wl_new->flags |= wl->flags & WINLINK_ALERTFLAGS;

		if (wl == s->curw)
			new_curw_idx = wl_new->idx;

		new_idx++;
	}

	/* Fix the stack of last windows now. */
	memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
	TAILQ_INIT(&s->lastw);
	TAILQ_FOREACH(wl, &old_lastw, sentry) {
		wl_new = winlink_find_by_window(&s->windows, wl->window);
		if (wl_new != NULL)
			TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
	}

	/* Set the current window. */
	s->curw = winlink_find_by_index(&s->windows, new_curw_idx);

	/* Free the old winlinks (reducing window references too). */
	RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
		winlink_remove(&old_wins, wl);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: session.c,v 1.78 2017/11/02 18:27:35 nicm Exp $ */
2
3			/*
4			* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15			* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/types.h>
20			#include <sys/time.h>
21
22			#include <paths.h>
23			#include <string.h>
24			#include <stdlib.h>
25			#include <unistd.h>
26			#include <time.h>
27
28			#include "tmux.h"
29
30			struct sessions sessions;
31			static u_int next_session_id;
32			struct session_groups session_groups;
33
34			static void session_free(int, short, void *);
35
36			static void session_lock_timer(int, short, void *);
37
38			static struct winlink session_next_alert(struct winlink );
39			static struct winlink session_previous_alert(struct winlink );
40
41			static void session_group_remove(struct session *);
42			static void session_group_synchronize1(struct session , struct session );
43
44			RB_GENERATE(sessions, session, entry, session_cmp);
45
46			int
47			session_cmp(struct session s1, struct session s2)
48			{
49			return (strcmp(s1->name, s2->name));
50			}
51
52			RB_GENERATE(session_groups, session_group, entry, session_group_cmp);
53
54			int
55			session_group_cmp(struct session_group s1, struct session_group s2)
56			{
57			return (strcmp(s1->name, s2->name));
58			}
59
60			/*
61			* Find if session is still alive. This is true if it is still on the global
62			* sessions list.
63			*/
64			int
65			session_alive(struct session *s)
66			{
67			struct session *s_loop;
68
69			RB_FOREACH(s_loop, sessions, &sessions) {
70			if (s_loop == s)
71			return (1);
72			}
73			return (0);
74			}
75
76			/* Find session by name. */
77			struct session *
78			session_find(const char *name)
79			{
80			struct session s;
81
82			s.name = (char *) name;
83			return (RB_FIND(sessions, &sessions, &s));
84			}
85
86			/* Find session by id parsed from a string. */
87			struct session *
88			session_find_by_id_str(const char *s)
89			{
90			const char *errstr;
91			u_int id;
92
93			if (*s != '$')
94			return (NULL);
95
96			id = strtonum(s + 1, 0, UINT_MAX, &errstr);
97			if (errstr != NULL)
98			return (NULL);
99			return (session_find_by_id(id));
100			}
101
102			/* Find session by id. */
103			struct session *
104			session_find_by_id(u_int id)
105			{
106			struct session *s;
107
108			RB_FOREACH(s, sessions, &sessions) {
109			if (s->id == id)
110			return (s);
111			}
112			return (NULL);
113			}
114
115			/* Create a new session. */
116			struct session *
117			session_create(const char prefix, const char name, int argc, char **argv,
118			const char path, const char cwd, struct environ env, struct termios tio,
119			int idx, u_int sx, u_int sy, char **cause)
120			{
121			struct session *s;
122			struct winlink *wl;
123
124			s = xcalloc(1, sizeof *s);
125			s->references = 1;
126			s->flags = 0;
127
128			s->cwd = xstrdup(cwd);
129
130			s->curw = NULL;
131			TAILQ_INIT(&s->lastw);
132			RB_INIT(&s->windows);
133
134			s->environ = environ_create();
135			if (env != NULL)
136			environ_copy(env, s->environ);
137
138			s->options = options_create(global_s_options);
139			s->hooks = hooks_create(global_hooks);
140
141			status_update_saved(s);
142
143			s->tio = NULL;
144			if (tio != NULL) {
145			s->tio = xmalloc(sizeof *s->tio);
146			memcpy(s->tio, tio, sizeof *s->tio);
147			}
148
149			s->sx = sx;
150			s->sy = sy;
151
152			if (name != NULL) {
153			s->name = xstrdup(name);
154			s->id = next_session_id++;
155			} else {
156			s->name = NULL;
157			do {
158			s->id = next_session_id++;
159			free(s->name);
160			if (prefix != NULL)
161			xasprintf(&s->name, "%s-%u", prefix, s->id);
162			else
163			xasprintf(&s->name, "%u", s->id);
164			} while (RB_FIND(sessions, &sessions, s) != NULL);
165			}
166			RB_INSERT(sessions, &sessions, s);
167
168			log_debug("new session %s $%u", s->name, s->id);
169
170			if (gettimeofday(&s->creation_time, NULL) != 0)
171			fatal("gettimeofday failed");
172			session_update_activity(s, &s->creation_time);
173
174			if (argc >= 0) {
175			wl = session_new(s, NULL, argc, argv, path, cwd, idx, cause);
176			if (wl == NULL) {
177			session_destroy(s, __func__);
178			return (NULL);
179			}
180			session_select(s, RB_ROOT(&s->windows)->idx);
181			}
182
183			log_debug("session %s created", s->name);
184
185			return (s);
186			}
187
188			/* Add a reference to a session. */
189			void
190			session_add_ref(struct session s, const char from)
191			{
192			s->references++;
193			log_debug("%s: %s %s, now %d", __func__, s->name, from, s->references);
194			}
195
196			/* Remove a reference from a session. */
197			void
198			session_remove_ref(struct session s, const char from)
199			{
200			s->references--;
201			log_debug("%s: %s %s, now %d", __func__, s->name, from, s->references);
202
203			if (s->references == 0)
204			event_once(-1, EV_TIMEOUT, session_free, s, NULL);
205			}
206
207			/* Free session. */
208			static void
209			session_free(__unused int fd, __unused short events, void *arg)
210			{
211			struct session *s = arg;
212
213			log_debug("session %s freed (%d references)", s->name, s->references);
214
215			if (s->references == 0) {
216			environ_free(s->environ);
217
218			options_free(s->options);
219			hooks_free(s->hooks);
220
221			free(s->name);
222			free(s);
223			}
224			}
225
226			/* Destroy a session. */
227			void
228			session_destroy(struct session s, const char from)
229			{
230			struct winlink *wl;
231
232			log_debug("session %s destroyed (%s)", s->name, from);
233			s->curw = NULL;
234
235			RB_REMOVE(sessions, &sessions, s);
236			notify_session("session-closed", s);
237
238			free(s->tio);
239
240			if (event_initialized(&s->lock_timer))
241			event_del(&s->lock_timer);
242
243			session_group_remove(s);
244
245			while (!TAILQ_EMPTY(&s->lastw))
246			winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
247			while (!RB_EMPTY(&s->windows)) {
248			wl = RB_ROOT(&s->windows);
249			notify_session_window("window-unlinked", s, wl->window);
250			winlink_remove(&s->windows, wl);
251			}
252
253			free((void *)s->cwd);
254
255			session_remove_ref(s, __func__);
256			}
257
258			/* Check a session name is valid: not empty and no colons or periods. */
259			int
260			session_check_name(const char *name)
261			{
262			return (*name != '\0' && name[strcspn(name, ":.")] == '\0');
263			}
264
265			/* Lock session if it has timed out. */
266			static void
267			session_lock_timer(__unused int fd, __unused short events, void *arg)
268			{
269			struct session *s = arg;
270
271			if (s->flags & SESSION_UNATTACHED)
272			return;
273
274			log_debug("session %s locked, activity time %lld", s->name,
275			(long long)s->activity_time.tv_sec);
276
277			server_lock_session(s);
278			recalculate_sizes();
279			}
280
281			/* Update activity time. */
282			void
283			session_update_activity(struct session s, struct timeval from)
284			{
285			struct timeval *last = &s->last_activity_time;
286			struct timeval tv;
287
288			memcpy(last, &s->activity_time, sizeof *last);
289			if (from == NULL)
290			gettimeofday(&s->activity_time, NULL);
291			else
292			memcpy(&s->activity_time, from, sizeof s->activity_time);
293
294			log_debug("session %s activity %lld.%06d (last %lld.%06d)", s->name,
295			(long long)s->activity_time.tv_sec, (int)s->activity_time.tv_usec,
296			(long long)last->tv_sec, (int)last->tv_usec);
297
298			if (evtimer_initialized(&s->lock_timer))
299			evtimer_del(&s->lock_timer);
300			else
301			evtimer_set(&s->lock_timer, session_lock_timer, s);
302
303			if (~s->flags & SESSION_UNATTACHED) {
304			timerclear(&tv);
305			tv.tv_sec = options_get_number(s->options, "lock-after-time");
306			if (tv.tv_sec != 0)
307			evtimer_add(&s->lock_timer, &tv);
308			}
309			}
310
311			/* Find the next usable session. */
312			struct session *
313			session_next_session(struct session *s)
314			{
315			struct session *s2;
316
317			if (RB_EMPTY(&sessions) \|\| !session_alive(s))
318			return (NULL);
319
320			s2 = RB_NEXT(sessions, &sessions, s);
321			if (s2 == NULL)
322			s2 = RB_MIN(sessions, &sessions);
323			if (s2 == s)
324			return (NULL);
325			return (s2);
326			}
327
328			/* Find the previous usable session. */
329			struct session *
330			session_previous_session(struct session *s)
331			{
332			struct session *s2;
333
334			if (RB_EMPTY(&sessions) \|\| !session_alive(s))
335			return (NULL);
336
337			s2 = RB_PREV(sessions, &sessions, s);
338			if (s2 == NULL)
339			s2 = RB_MAX(sessions, &sessions);
340			if (s2 == s)
341			return (NULL);
342			return (s2);
343			}
344
345			/* Create a new window on a session. */
346			struct winlink *
347			session_new(struct session s, const char name, int argc, char **argv,
348			const char path, const char cwd, int idx, char **cause)
349			{
350			struct window *w;
351			struct winlink *wl;
352			struct environ *env;
353			const char *shell;
354			u_int hlimit;
355
356			if ((wl = winlink_add(&s->windows, idx)) == NULL) {
357			xasprintf(cause, "index in use: %d", idx);
358			return (NULL);
359			}
360			wl->session = s;
361
362			shell = options_get_string(s->options, "default-shell");
363			if (*shell == '\0' \|\| areshell(shell))
364			shell = _PATH_BSHELL;
365
366			hlimit = options_get_number(s->options, "history-limit");
367			env = environ_for_session(s, 0);
368			w = window_create_spawn(name, argc, argv, path, shell, cwd, env, s->tio,
369			s->sx, s->sy, hlimit, cause);
370			if (w == NULL) {
371			winlink_remove(&s->windows, wl);
372			environ_free(env);
373			return (NULL);
374			}
375			winlink_set_window(wl, w);
376			environ_free(env);
377			notify_session_window("window-linked", s, w);
378
379			session_group_synchronize_from(s);
380			return (wl);
381			}
382
383			/* Attach a window to a session. */
384			struct winlink *
385			session_attach(struct session s, struct window w, int idx, char **cause)
386			{
387			struct winlink *wl;
388
389			if ((wl = winlink_add(&s->windows, idx)) == NULL) {
390			xasprintf(cause, "index in use: %d", idx);
391			return (NULL);
392			}
393			wl->session = s;
394			winlink_set_window(wl, w);
395			notify_session_window("window-linked", s, w);
396
397			session_group_synchronize_from(s);
398			return (wl);
399			}
400
401			/* Detach a window from a session. */
402			int
403			session_detach(struct session s, struct winlink wl)
404			{
405			if (s->curw == wl &&
406			session_last(s) != 0 &&
407			session_previous(s, 0) != 0)
408			session_next(s, 0);
409
410			wl->flags &= ~WINLINK_ALERTFLAGS;
411			notify_session_window("window-unlinked", s, wl->window);
412			winlink_stack_remove(&s->lastw, wl);
413			winlink_remove(&s->windows, wl);
414
415			session_group_synchronize_from(s);
416
417			if (RB_EMPTY(&s->windows)) {
418			session_destroy(s, __func__);
419			return (1);
420			}
421			return (0);
422			}
423
424			/* Return if session has window. */
425			int
426			session_has(struct session s, struct window w)
427			{
428			struct winlink *wl;
429
430			TAILQ_FOREACH(wl, &w->winlinks, wentry) {
431			if (wl->session == s)
432			return (1);
433			}
434			return (0);
435			}
436
437			/*
438			* Return 1 if a window is linked outside this session (not including session
439			* groups). The window must be in this session!
440			*/
441			int
442			session_is_linked(struct session s, struct window w)
443			{
444			struct session_group *sg;
445
446			if ((sg = session_group_contains(s)) != NULL)
447			return (w->references != session_group_count(sg));
448			return (w->references != 1);
449			}
450
451			static struct winlink *
452			session_next_alert(struct winlink *wl)
453			{
454			while (wl != NULL) {
455			if (wl->flags & WINLINK_ALERTFLAGS)
456			break;
457			wl = winlink_next(wl);
458			}
459			return (wl);
460			}
461
462			/* Move session to next window. */
463			int
464			session_next(struct session *s, int alert)
465			{
466			struct winlink *wl;
467
468			if (s->curw == NULL)
469			return (-1);
470
471			wl = winlink_next(s->curw);
472			if (alert)
473			wl = session_next_alert(wl);
474			if (wl == NULL) {
475			wl = RB_MIN(winlinks, &s->windows);
476			if (alert && ((wl = session_next_alert(wl)) == NULL))
477			return (-1);
478			}
479			return (session_set_current(s, wl));
480			}
481
482			static struct winlink *
483			session_previous_alert(struct winlink *wl)
484			{
485			while (wl != NULL) {
486			if (wl->flags & WINLINK_ALERTFLAGS)
487			break;
488			wl = winlink_previous(wl);
489			}
490			return (wl);
491			}
492
493			/* Move session to previous window. */
494			int
495			session_previous(struct session *s, int alert)
496			{
497			struct winlink *wl;
498
499			if (s->curw == NULL)
500			return (-1);
501
502			wl = winlink_previous(s->curw);
503			if (alert)
504			wl = session_previous_alert(wl);
505			if (wl == NULL) {
506			wl = RB_MAX(winlinks, &s->windows);
507			if (alert && (wl = session_previous_alert(wl)) == NULL)
508			return (-1);
509			}
510			return (session_set_current(s, wl));
511			}
512
513			/* Move session to specific window. */
514			int
515			session_select(struct session *s, int idx)
516			{
517			struct winlink *wl;
518
519			wl = winlink_find_by_index(&s->windows, idx);
520			return (session_set_current(s, wl));
521			}
522
523			/* Move session to last used window. */
524			int
525			session_last(struct session *s)
526			{
527			struct winlink *wl;
528
529			wl = TAILQ_FIRST(&s->lastw);
530			if (wl == NULL)
531			return (-1);
532			if (wl == s->curw)
533			return (1);
534
535			return (session_set_current(s, wl));
536			}
537
538			/* Set current winlink to wl .*/
539			int
540			session_set_current(struct session s, struct winlink wl)
541			{
542			if (wl == NULL)
543			return (-1);
544			if (wl == s->curw)
545			return (1);
546
547			winlink_stack_remove(&s->lastw, wl);
548			winlink_stack_push(&s->lastw, s->curw);
549			s->curw = wl;
550			winlink_clear_flags(wl);
551			window_update_activity(wl->window);
552			notify_session("session-window-changed", s);
553			return (0);
554			}
555
556			/* Find the session group containing a session. */
557			struct session_group *
558			session_group_contains(struct session *target)
559			{
560			struct session_group *sg;
561			struct session *s;
562
563			RB_FOREACH(sg, session_groups, &session_groups) {
564			TAILQ_FOREACH(s, &sg->sessions, gentry) {
565			if (s == target)
566			return (sg);
567			}
568			}
569			return (NULL);
570			}
571
572			/* Find session group by name. */
573			struct session_group *
574			session_group_find(const char *name)
575			{
576			struct session_group sg;
577
578			sg.name = name;
579			return (RB_FIND(session_groups, &session_groups, &sg));
580			}
581
582			/* Create a new session group. */
583			struct session_group *
584			session_group_new(const char *name)
585			{
586			struct session_group *sg;
587
588			if ((sg = session_group_find(name)) != NULL)
589			return (sg);
590
591			sg = xcalloc(1, sizeof *sg);
592			sg->name = xstrdup(name);
593			TAILQ_INIT(&sg->sessions);
594
595			RB_INSERT(session_groups, &session_groups, sg);
596			return (sg);
597			}
598
599			/* Add a session to a session group. */
600			void
601			session_group_add(struct session_group sg, struct session s)
602			{
603			if (session_group_contains(s) == NULL)
604			TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
605			}
606
607			/* Remove a session from its group and destroy the group if empty. */
608			static void
609			session_group_remove(struct session *s)
610			{
611			struct session_group *sg;
612
613			if ((sg = session_group_contains(s)) == NULL)
614			return;
615			TAILQ_REMOVE(&sg->sessions, s, gentry);
616			if (TAILQ_EMPTY(&sg->sessions)) {
617			RB_REMOVE(session_groups, &session_groups, sg);
618			free(sg);
619			}
620			}
621
622			/* Count number of sessions in session group. */
623			u_int
624			session_group_count(struct session_group *sg)
625			{
626			struct session *s;
627			u_int n;
628
629			n = 0;
630			TAILQ_FOREACH(s, &sg->sessions, gentry)
631			n++;
632			return (n);
633			}
634
635			/* Synchronize a session to its session group. */
636			void
637			session_group_synchronize_to(struct session *s)
638			{
639			struct session_group *sg;
640			struct session *target;
641
642			if ((sg = session_group_contains(s)) == NULL)
643			return;
644
645			target = NULL;
646			TAILQ_FOREACH(target, &sg->sessions, gentry) {
647			if (target != s)
648			break;
649			}
650			if (target != NULL)
651			session_group_synchronize1(target, s);
652			}
653
654			/* Synchronize a session group to a session. */
655			void
656			session_group_synchronize_from(struct session *target)
657			{
658			struct session_group *sg;
659			struct session *s;
660
661			if ((sg = session_group_contains(target)) == NULL)
662			return;
663
664			TAILQ_FOREACH(s, &sg->sessions, gentry) {
665			if (s != target)
666			session_group_synchronize1(target, s);
667			}
668			}
669
670			/*
671			* Synchronize a session with a target session. This means destroying all
672			* winlinks then recreating them, then updating the current window, last window
673			* stack and alerts.
674			*/
675			static void
676			session_group_synchronize1(struct session target, struct session s)
677			{
678			struct winlinks old_windows, *ww;
679			struct winlink_stack old_lastw;
680			struct winlink wl, wl2;
681
682			/* Don't do anything if the session is empty (it'll be destroyed). */
683			ww = &target->windows;
684			if (RB_EMPTY(ww))
685			return;
686
687			/* If the current window has vanished, move to the next now. */
688			if (s->curw != NULL &&
689			winlink_find_by_index(ww, s->curw->idx) == NULL &&
690			session_last(s) != 0 && session_previous(s, 0) != 0)
691			session_next(s, 0);
692
693			/* Save the old pointer and reset it. */
694			memcpy(&old_windows, &s->windows, sizeof old_windows);
695			RB_INIT(&s->windows);
696
697			/* Link all the windows from the target. */
698			RB_FOREACH(wl, winlinks, ww) {
699			wl2 = winlink_add(&s->windows, wl->idx);
700			wl2->session = s;
701			winlink_set_window(wl2, wl->window);
702			notify_session_window("window-linked", s, wl2->window);
703			wl2->flags \|= wl->flags & WINLINK_ALERTFLAGS;
704			}
705
706			/* Fix up the current window. */
707			if (s->curw != NULL)
708			s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
709			else
710			s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
711
712			/* Fix up the last window stack. */
713			memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
714			TAILQ_INIT(&s->lastw);
715			TAILQ_FOREACH(wl, &old_lastw, sentry) {
716			wl2 = winlink_find_by_index(&s->windows, wl->idx);
717			if (wl2 != NULL)
718			TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
719			}
720
721			/* Then free the old winlinks list. */
722			while (!RB_EMPTY(&old_windows)) {
723			wl = RB_ROOT(&old_windows);
724			wl2 = winlink_find_by_window_id(&s->windows, wl->window->id);
725			if (wl2 == NULL)
726			notify_session_window("window-unlinked", s, wl->window);
727			winlink_remove(&old_windows, wl);
728			}
729			}
730
731			/* Renumber the windows across winlinks attached to a specific session. */
732			void
733			session_renumber_windows(struct session *s)
734			{
735			struct winlink wl, wl1, *wl_new;
736			struct winlinks old_wins;
737			struct winlink_stack old_lastw;
738			int new_idx, new_curw_idx;
739
740			/* Save and replace old window list. */
741			memcpy(&old_wins, &s->windows, sizeof old_wins);
742			RB_INIT(&s->windows);
743
744			/* Start renumbering from the base-index if it's set. */
745			new_idx = options_get_number(s->options, "base-index");
746			new_curw_idx = 0;
747
748			/* Go through the winlinks and assign new indexes. */
749			RB_FOREACH(wl, winlinks, &old_wins) {
750			wl_new = winlink_add(&s->windows, new_idx);
751			wl_new->session = s;
752			winlink_set_window(wl_new, wl->window);
753			wl_new->flags \|= wl->flags & WINLINK_ALERTFLAGS;
754
755			if (wl == s->curw)
756			new_curw_idx = wl_new->idx;
757
758			new_idx++;
759			}
760
761			/* Fix the stack of last windows now. */
762			memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
763			TAILQ_INIT(&s->lastw);
764			TAILQ_FOREACH(wl, &old_lastw, sentry) {
765			wl_new = winlink_find_by_window(&s->windows, wl->window);
766			if (wl_new != NULL)
767			TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
768			}
769
770			/* Set the current window. */
771			s->curw = winlink_find_by_index(&s->windows, new_curw_idx);
772
773			/* Free the old winlinks (reducing window references too). */
774			RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
775			winlink_remove(&old_wins, wl);
776			}