Adding upstream version 3.3a.upstream/3.3a

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 749 insertions, 0 deletions

diff --git a/session.c b/session.c
new file mode 100644
index 0000000..7502888
--- /dev/null
+++ b/session.c
@@ -0,0 +1,749 @@
+/* $OpenBSD$ */
+
+/*
+ * 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/time.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "tmux.h"
+
+struct sessions		sessions;
+u_int			next_session_id;
+struct session_groups	session_groups = RB_INITIALIZER(&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 *);
+
+int
+session_cmp(struct session *s1, struct session *s2)
+{
+	return (strcmp(s1->name, s2->name));
+}
+RB_GENERATE(sessions, session, entry, session_cmp);
+
+static int
+session_group_cmp(struct session_group *s1, struct session_group *s2)
+{
+	return (strcmp(s1->name, s2->name));
+}
+RB_GENERATE_STATIC(session_groups, session_group, entry, session_group_cmp);
+
+/*
+ * 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, const char *cwd,
+    struct environ *env, struct options *oo, struct termios *tio)
+{
+	struct session	*s;
+
+	s = xcalloc(1, sizeof *s);
+	s->references = 1;
+	s->flags = 0;
+
+	s->cwd = xstrdup(cwd);
+
+	TAILQ_INIT(&s->lastw);
+	RB_INIT(&s->windows);
+
+	s->environ = env;
+	s->options = oo;
+
+	status_update_cache(s);
+
+	s->tio = NULL;
+	if (tio != NULL) {
+		s->tio = xmalloc(sizeof *s->tio);
+		memcpy(s->tio, tio, sizeof *s->tio);
+	}
+
+	if (name != NULL) {
+		s->name = xstrdup(name);
+		s->id = next_session_id++;
+	} else {
+		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);
+
+	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);
+
+		free(s->name);
+		free(s);
+	}
+}
+
+/* Destroy a session. */
+void
+session_destroy(struct session *s, int notify, const char *from)
+{
+	struct winlink	*wl;
+
+	log_debug("session %s destroyed (%s)", s->name, from);
+
+	if (s->curw == NULL)
+		return;
+	s->curw = NULL;
+
+	RB_REMOVE(sessions, &sessions, s);
+	if (notify)
+		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__);
+}
+
+/* Sanitize session name. */
+char *
+session_check_name(const char *name)
+{
+	char	*copy, *cp, *new_name;
+
+	if (*name == '\0')
+		return (NULL);
+	copy = xstrdup(name);
+	for (cp = copy; *cp != '\0'; cp++) {
+		if (*cp == ':' || *cp == '.')
+			*cp = '_';
+	}
+	utf8_stravis(&new_name, copy, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+	free(copy);
+	return (new_name);
+}
+
+/* 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->attached == 0)
+		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 $%u %s activity %lld.%06d (last %lld.%06d)", s->id,
+	    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->attached != 0) {
+		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);
+}
+
+/* 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, 1, __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)
+{
+	struct winlink	*old = s->curw;
+
+	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;
+	if (options_get_number(global_options, "focus-events")) {
+		if (old != NULL)
+			window_update_focus(old->window);
+		window_update_focus(wl->window);
+	}
+	winlink_clear_flags(wl);
+	window_update_activity(wl->window);
+	tty_update_window_offset(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((void *)sg->name);
+		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);
+}
+
+/* Count number of clients attached to sessions in session group. */
+u_int
+session_group_attached_count(struct session_group *sg)
+{
+	struct session	*s;
+	u_int		 n;
+
+	n = 0;
+	TAILQ_FOREACH(s, &sg->sessions, gentry)
+		n += s->attached;
+	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);
+}