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Change the way backoff works. Instead of stopping reading from the pty
when the client tty backs up too much, just stop updating the tty and
only update the internal screen. Then when the tty recovers, force a
redraw.

This prevents a dodgy client from causing other clients to go into
backoff while still allowing tmux to be responsive (locally) when seeing
lots of output.

/* $OpenBSD: server-window.c,v 1.17 2010/08/11 07:34:43 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 <event.h>
#include <unistd.h>

#include "tmux.h"

int	server_window_backoff(struct window_pane *);
int	server_window_check_bell(struct session *, struct winlink *);
int	server_window_check_activity(struct session *, struct winlink *);
int	server_window_check_content(
	    struct session *, struct winlink *, struct window_pane *);

/* Window functions that need to happen every loop. */
void
server_window_loop(void)
{
	struct window		*w;
	struct winlink		*wl;
	struct window_pane	*wp;
	struct session		*s;
	u_int		 	 i, j;

	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
		w = ARRAY_ITEM(&windows, i);
		if (w == NULL)
			continue;

		for (j = 0; j < ARRAY_LENGTH(&sessions); j++) {
			s = ARRAY_ITEM(&sessions, j);
			if (s == NULL)
				continue;
			wl = session_has(s, w);
			if (wl == NULL)
				continue;

			if (server_window_check_bell(s, wl) ||
			    server_window_check_activity(s, wl))
				server_status_session(s);
			TAILQ_FOREACH(wp, &w->panes, entry)
				server_window_check_content(s, wl, wp);
		}
		w->flags &= ~(WINDOW_BELL|WINDOW_ACTIVITY);
	}
}

/* Check for bell in window. */
int
server_window_check_bell(struct session *s, struct winlink *wl)
{
	struct client	*c;
	struct window	*w = wl->window;
	u_int		 i;
	int		 action, visual;

	if (!(w->flags & WINDOW_BELL) || wl->flags & WINLINK_BELL)
		return (0);
	if (s->curw != wl)
		wl->flags |= WINLINK_BELL;

	action = options_get_number(&s->options, "bell-action");
	switch (action) {
	case BELL_ANY:
		if (s->flags & SESSION_UNATTACHED)
			break;
		visual = options_get_number(&s->options, "visual-bell");
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			if (!visual) {
				tty_putcode(&c->tty, TTYC_BEL);
				continue;
			}
			if (c->session->curw->window == w) {
				status_message_set(c, "Bell in current window");
				continue;
			}
			status_message_set(c, "Bell in window %u",
			    winlink_find_by_window(&s->windows, w)->idx);
		}
		break;
	case BELL_CURRENT:
		if (s->flags & SESSION_UNATTACHED)
			break;
		visual = options_get_number(&s->options, "visual-bell");
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			if (c->session->curw->window != w)
				continue;
			if (!visual) {
				tty_putcode(&c->tty, TTYC_BEL);
				continue;
			}
			status_message_set(c, "Bell in current window");
		}
		break;
	}

	return (1);
}

/* Check for activity in window. */
int
server_window_check_activity(struct session *s, struct winlink *wl)
{
	struct client	*c;
	struct window	*w = wl->window;
	u_int		 i;

	if (!(w->flags & WINDOW_ACTIVITY) || wl->flags & WINLINK_ACTIVITY)
		return (0);
	if (s->curw == wl)
		return (0);

	if (!options_get_number(&w->options, "monitor-activity"))
		return (0);

	wl->flags |= WINLINK_ACTIVITY;

	if (options_get_number(&s->options, "visual-activity")) {
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			status_message_set(c, "Activity in window %u",
			    winlink_find_by_window(&s->windows, w)->idx);
		}
	}

	return (1);
}

/* Check for content change in window. */
int
server_window_check_content(
    struct session *s, struct winlink *wl, struct window_pane *wp)
{
	struct client	*c;
	struct window	*w = wl->window;
	u_int		 i;
	char		*found, *ptr;

	/* Activity flag must be set for new content. */
	if (!(w->flags & WINDOW_ACTIVITY) || wl->flags & WINLINK_CONTENT)
		return (0);
	if (s->curw == wl)
		return (0);

	ptr = options_get_string(&w->options, "monitor-content");
	if (ptr == NULL || *ptr == '\0')
		return (0);
	if ((found = window_pane_search(wp, ptr, NULL)) == NULL)
		return (0);
	xfree(found);

	wl->flags |= WINLINK_CONTENT;

	if (options_get_number(&s->options, "visual-content")) {
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			status_message_set(c, "Content in window %u",
			    winlink_find_by_window(&s->windows, w)->idx);
		}
	}

	return (1);
}