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If any client currently displaying a window pane has more than 1 KB of output
buffered, don't accept any further data from the process running in the pane.

This makes tmux much more responsive when flooded with output, although other
buffers can still have an impact when running remotely.

Prompted by a query from Ranganathan Sankaralingam.

/* $OpenBSD: server-window.c,v 1.3 2009/10/28 22:53:14 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 <unistd.h>

#include "tmux.h"

int	server_window_backoff(struct window_pane *);
int	server_window_check_bell(struct session *, struct window *);
int	server_window_check_activity(struct session *, struct window *);
int	server_window_check_content(
	    struct session *, struct window *, struct window_pane *);
void	server_window_check_alive(struct window *);

/* Register windows for poll. */
void
server_window_prepare(void)
{
	struct window		*w;
	struct window_pane	*wp;
	u_int		 	 i;
	int			 events;

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

		TAILQ_FOREACH(wp, &w->panes, entry) {	
			if (wp->fd == -1)
				continue;
			events = 0;
			if (!server_window_backoff(wp))
				events |= POLLIN;
			if (BUFFER_USED(wp->out) > 0)
				events |= POLLOUT;
			server_poll_add(
			    wp->fd, events, server_window_callback, wp);

			if (wp->pipe_fd == -1)
				continue;
			events = 0;
			if (BUFFER_USED(wp->pipe_buf) > 0)
				events |= POLLOUT;
			server_poll_add(
			    wp->pipe_fd, events, server_window_callback, wp);
		}
	}
}

/* Check if this window should suspend reading. */
int
server_window_backoff(struct window_pane *wp)
{
	struct client	*c;
	u_int		 i;

	if (!window_pane_visible(wp))
		return (0);

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session->curw->window != wp->window)
			continue;
		if (BUFFER_USED(c->tty.out) > BACKOFF_THRESHOLD)
			return (1);
	}
	return (0);
}

/* Process a single window pane event. */
void
server_window_callback(int fd, int events, void *data)
{
	struct window_pane	*wp = data;

	if (wp->fd == -1)
		return;

	if (fd == wp->fd) {
		if (buffer_poll(fd, events, wp->in, wp->out) != 0) {
			close(wp->fd);
			wp->fd = -1;
		} else
			window_pane_parse(wp);
	}

	if (fd == wp->pipe_fd) {
		if (buffer_poll(fd, events, NULL, wp->pipe_buf) != 0) {
			buffer_destroy(wp->pipe_buf);
			close(wp->pipe_fd);
			wp->pipe_fd = -1;
		}
	}
}

/* Window functions that need to happen every loop. */
void
server_window_loop(void)
{
	struct window		*w;
	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 || !session_has(s, w))
				continue;
			
			if (server_window_check_bell(s, w) ||
			    server_window_check_activity(s, w))
				server_status_session(s);
			TAILQ_FOREACH(wp, &w->panes, entry)
				server_window_check_content(s, w, wp);
		}
		w->flags &= ~(WINDOW_BELL|WINDOW_ACTIVITY|WINDOW_CONTENT);

		server_window_check_alive(w);
	}

	set_window_names();
}

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

	if (!(w->flags & WINDOW_BELL))
		return (0);

	if (session_alert_has_window(s, w, WINDOW_BELL))
		return (0);
	session_alert_add(s, w, WINDOW_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 window *w)
{
	struct client	*c;
	u_int		 i;

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

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

	if (session_alert_has_window(s, w, WINDOW_ACTIVITY))
		return (0);
	session_alert_add(s, w, WINDOW_ACTIVITY);

	if (s->flags & SESSION_UNATTACHED)
		return (0);
 	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 window *w, struct window_pane *wp)
{
	struct client	*c;
	u_int		 i;
	char		*found, *ptr;
	
	if (!(w->flags & WINDOW_ACTIVITY))	/* activity for new content */
		return (0);
	if (s->curw->window == w)
		return (0);

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

	if (session_alert_has_window(s, w, WINDOW_CONTENT))
		return (0);

	if ((found = window_pane_search(wp, ptr, NULL)) == NULL)
		return (0);
    	xfree(found);

	session_alert_add(s, w, WINDOW_CONTENT);
	if (s->flags & SESSION_UNATTACHED)
		return (0);
 	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);
}

/* Check if window still exists. */
void
server_window_check_alive(struct window *w)
{
	struct window_pane	*wp, *wq;
	struct options		*oo = &w->options;
	struct session		*s;
	struct winlink		*wl;
	u_int		 	 i;
	int		 	 destroyed;

	destroyed = 1;

	wp = TAILQ_FIRST(&w->panes);
	while (wp != NULL) {
		wq = TAILQ_NEXT(wp, entry);
		/*
		 * If the pane has died and the remain-on-exit flag is not set,
		 * remove the pane; otherwise, if the flag is set, don't allow
		 * the window to be destroyed (or it'll close when the last
		 * pane dies).
		 */
		if (wp->fd == -1 && !options_get_number(oo, "remain-on-exit")) {
			layout_close_pane(wp);
			window_remove_pane(w, wp);
			server_redraw_window(w);
		} else 
			destroyed = 0;
		wp = wq;
	}

	if (!destroyed)
		return;

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

	restart:
		/* Detach window and either redraw or kill clients. */
		RB_FOREACH(wl, winlinks, &s->windows) {
			if (wl->window != w)
				continue;
			if (session_detach(s, wl)) {
				server_destroy_session_group(s);
				break;
			}
			server_redraw_session(s);
			server_status_session_group(s);
			goto restart;
		}
	}

	recalculate_sizes();
}