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	Add notify hooks for various events, the functions are currently empty
stubs but will be filled in for control mode later. From George Nachman.
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								session.c
									
									
									
									
									
								
							
							
						
						
									
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								session.c
									
									
									
									
									
								
							@@ -142,6 +142,7 @@ session_create(const char *name, const char *cmd, const char *cwd,
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	}
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	log_debug("session %s created", s->name);
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	notify_session_created(s);
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	return (s);
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}
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@@ -150,9 +151,11 @@ session_create(const char *name, const char *cmd, const char *cwd,
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void
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session_destroy(struct session *s)
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{
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	struct winlink	*wl;
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	log_debug("session %s destroyed", s->name);
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	RB_REMOVE(sessions, &sessions, s);
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	notify_session_closed(s);
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	if (s->tio != NULL)
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		xfree(s->tio);
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@@ -163,8 +166,11 @@ session_destroy(struct session *s)
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	while (!TAILQ_EMPTY(&s->lastw))
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		winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
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	while (!RB_EMPTY(&s->windows))
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		winlink_remove(&s->windows, RB_ROOT(&s->windows));
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	while (!RB_EMPTY(&s->windows)) {
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		wl = RB_ROOT(&s->windows);
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		notify_window_unlinked(s, wl->window);
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		winlink_remove(&s->windows, wl);
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	}
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	xfree(s->cwd);
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@@ -254,6 +260,7 @@ session_new(struct session *s,
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		return (NULL);
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	}
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	winlink_set_window(wl, w);
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	notify_window_linked(s, w);
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	environ_free(&env);
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	if (options_get_number(&s->options, "set-remain-on-exit"))
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@@ -274,6 +281,7 @@ session_attach(struct session *s, struct window *w, int idx, char **cause)
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		return (NULL);
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	}
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	winlink_set_window(wl, w);
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	notify_window_linked(s, w);
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	session_group_synchronize_from(s);
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	return (wl);
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@@ -288,6 +296,7 @@ session_detach(struct session *s, struct winlink *wl)
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		session_next(s, 0);
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	wl->flags &= ~WINLINK_ALERTFLAGS;
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	notify_window_unlinked(s, wl->window);
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	winlink_stack_remove(&s->lastw, wl);
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	winlink_remove(&s->windows, wl);
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	session_group_synchronize_from(s);
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@@ -555,6 +564,7 @@ session_group_synchronize1(struct session *target, struct session *s)
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	RB_FOREACH(wl, winlinks, ww) {
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		wl2 = winlink_add(&s->windows, wl->idx);
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		winlink_set_window(wl2, wl->window);
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		notify_window_linked(s, wl2->window);
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		wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
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	}
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@@ -576,6 +586,8 @@ session_group_synchronize1(struct session *target, struct session *s)
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	/* Then free the old winlinks list. */
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	while (!RB_EMPTY(&old_windows)) {
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		wl = RB_ROOT(&old_windows);
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		if (winlink_find_by_window_id(&s->windows, wl->window->id) == NULL)
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		    notify_window_unlinked(s, wl->window);
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		winlink_remove(&old_windows, wl);
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	}
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}
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