chromium/third_party/libevent/select.c

/*	$OpenBSD: select.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/

/*
 * Copyright 2000-2002 Niels Provos <[email protected]>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <sys/_libevent_time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#ifdef CHECK_INVARIANTS
#include <assert.h>
#endif

#include "event.h"
#include "evutil.h"
#include "event-internal.h"
#include "evsignal.h"
#include "log.h"

#ifndef howmany
#define howmany(x, y) …
#endif

#ifndef _EVENT_HAVE_FD_MASK
/* This type is mandatory, but Android doesn't define it. */
#undef NFDBITS
#define NFDBITS …
typedef unsigned long fd_mask;
#endif

struct selectop { … };

static void *select_init	(struct event_base *);
static int select_add		(void *, struct event *);
static int select_del		(void *, struct event *);
static int select_dispatch	(struct event_base *, void *, struct timeval *);
static void select_dealloc     (struct event_base *, void *);

const struct eventop selectops = …;

static int select_resize(struct selectop *sop, int fdsz);

static void *
select_init(struct event_base *base)
{ … }

#ifdef CHECK_INVARIANTS
static void
check_selectop(struct selectop *sop)
{
	int i;
	for (i = 0; i <= sop->event_fds; ++i) {
		if (FD_ISSET(i, sop->event_readset_in)) {
			assert(sop->event_r_by_fd[i]);
			assert(sop->event_r_by_fd[i]->ev_events & EV_READ);
			assert(sop->event_r_by_fd[i]->ev_fd == i);
		} else {
			assert(! sop->event_r_by_fd[i]);
		}
		if (FD_ISSET(i, sop->event_writeset_in)) {
			assert(sop->event_w_by_fd[i]);
			assert(sop->event_w_by_fd[i]->ev_events & EV_WRITE);
			assert(sop->event_w_by_fd[i]->ev_fd == i);
		} else {
			assert(! sop->event_w_by_fd[i]);
		}
	}

}
#else
#define check_selectop(sop) …
#endif

static int
select_dispatch(struct event_base *base, void *arg, struct timeval *tv)
{ … }


static int
select_resize(struct selectop *sop, int fdsz)
{ … }


static int
select_add(void *arg, struct event *ev)
{ … }

/*
 * Nothing to be done here.
 */

static int
select_del(void *arg, struct event *ev)
{ … }

static void
select_dealloc(struct event_base *base, void *arg)
{ … }