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Split the server code handling clients, jobs and windows off into separate
files from server.c (merging server-msg.c into the client file) and rather than
iterating over each set after poll(), allow a callback to be specified when the
fd is added and just walk once over the returned pollfds calling each callback
where needed.

More to come, getting this in so it is tested.

/* $OpenBSD: buffer-poll.c,v 1.4 2009/10/22 19:41:51 nicm Exp $ */

/*
 * Copyright (c) 2007 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 <errno.h>
#include <unistd.h>

#include "tmux.h"

/* Fill buffers from socket based on poll results. */
int
buffer_poll(int fd, int events, struct buffer *in, struct buffer *out)
{
	ssize_t	n;

	if (events & (POLLERR|POLLNVAL))
		return (-1);
	if (in != NULL && events & POLLIN) {
		buffer_ensure(in, BUFSIZ);
		n = read(fd, BUFFER_IN(in), BUFFER_FREE(in));
		if (n == 0)
			return (-1);
		if (n == -1) {
			if (errno != EINTR && errno != EAGAIN)
				return (-1);
		} else
			buffer_add(in, n);
	} else if (events & POLLHUP)
		return (-1);
	if (out != NULL && BUFFER_USED(out) > 0 && events & POLLOUT) {
		n = write(fd, BUFFER_OUT(out), BUFFER_USED(out));
		if (n == -1) {
			if (errno != EINTR && errno != EAGAIN)
				return (-1);
		} else
			buffer_remove(out, n);
	}
	return (0);
}