path: root/server.c

/* $OpenBSD$ */

/*
 * 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 <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <sys/wait.h>

#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Main server functions.
 */

/* Client list. */
struct clients	 clients;
struct clients	 dead_clients;

/* Mapping of a pollfd to an fd independent of its position in the array. */
struct poll_item {
	struct pollfd	 pfd;

	RB_ENTRY(poll_item) entry;
};
RB_HEAD(poll_items, poll_item) poll_items;

int		 server_poll_cmp(struct poll_item *, struct poll_item *);
struct pollfd	*server_poll_lookup(int);
void		 server_poll_add(int, int);
struct pollfd	*server_poll_flatten(int *);
void		 server_poll_parse(struct pollfd *);
void		 server_poll_reset(void);
RB_PROTOTYPE(poll_items, poll_item, entry, server_poll_cmp);
RB_GENERATE(poll_items, poll_item, entry, server_poll_cmp);

void		 server_create_client(int);
int		 server_create_socket(void);
int		 server_main(int);
void		 server_shutdown(void);
int		 server_should_shutdown(void);
void		 server_child_signal(void);
void		 server_fill_windows(void);
void		 server_handle_windows(void);
void		 server_fill_clients(void);
void		 server_handle_clients(void);
void		 server_accept_client(int);
void		 server_handle_client(struct client *);
void		 server_handle_window(struct window *, struct window_pane *);
int		 server_check_window_bell(struct session *, struct window *);
int		 server_check_window_activity(struct session *,
		      struct window *);
int		 server_check_window_content(struct session *, struct window *,
		      struct window_pane *);
void		 server_clean_dead(void);
void		 server_lost_client(struct client *);
void	 	 server_check_window(struct window *);
void		 server_check_redraw(struct client *);
void		 server_set_title(struct client *);
void		 server_check_timers(struct client *);
void		 server_lock_server(void);
void		 server_lock_sessions(void);
void		 server_second_timers(void);
int		 server_update_socket(void);

int
server_poll_cmp(struct poll_item *pitem1, struct poll_item *pitem2)
{
	return (pitem1->pfd.fd - pitem2->pfd.fd);
}

struct pollfd *
server_poll_lookup(int fd)
{
	struct poll_item	pitem;

	pitem.pfd.fd = fd;
	return (&RB_FIND(poll_items, &poll_items, &pitem)->pfd);
}

void
server_poll_add(int fd, int events)
{
	struct poll_item	*pitem;

	pitem = xmalloc(sizeof *pitem);
	pitem->pfd.fd = fd;
	pitem->pfd.events = events;
	RB_INSERT(poll_items, &poll_items, pitem);
}

struct pollfd *
server_poll_flatten(int *nfds)
{
	struct poll_item	*pitem;
	struct pollfd		*pfds;

	pfds = NULL;
	*nfds = 0;
	RB_FOREACH(pitem, poll_items, &poll_items) {
		pfds = xrealloc(pfds, (*nfds) + 1, sizeof *pfds);
		pfds[*nfds].fd = pitem->pfd.fd;
		pfds[*nfds].events = pitem->pfd.events;
		(*nfds)++;
	}
	return (pfds);
}

void
server_poll_parse(struct pollfd *pfds)
{
	struct poll_item	*pitem;
	int			 nfds;

	nfds = 0;
	RB_FOREACH(pitem, poll_items, &poll_items) {
		pitem->pfd.revents = pfds[nfds].revents;
		nfds++;
	}
	xfree(pfds);
}

void
server_poll_reset(void