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Replace select backends with poll backends.  selscan() and pollscan()
now call the poll backend.  With this change we implement greater
poll(2) functionality instead of emulating it via the select backend.
Adapted from NetBSD and including some changes from FreeBSD.
Tested by many, deraadt@ OK

/*	$OpenBSD: sys_socket.c,v 1.9 2003/09/23 16:51:12 millert Exp $	*/
/*	$NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *	@(#)sys_socket.c	8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/stat.h>

#include <net/if.h>
#include <net/route.h>

struct	fileops socketops = {
	soo_read, soo_write, soo_ioctl, soo_poll, soo_kqfilter,
	soo_stat, soo_close
};

/* ARGSUSED */
int
soo_read(fp, poff, uio, cred)
	struct file *fp;
	off_t *poff;
	struct uio *uio;
	struct ucred *cred;
{

	return (soreceive((struct socket *)fp->f_data, (struct mbuf **)0,
		uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0));
}

/* ARGSUSED */
int
soo_write(fp, poff, uio, cred)
	struct file *fp;
	off_t *poff;
	struct uio *uio;
	struct ucred *cred;
{

	return (sosend((struct socket *)fp->f_data, (struct mbuf *)0,
		uio, (struct mbuf *)0, (struct mbuf *)0, 0));
}

int
soo_ioctl(fp, cmd, data, p)
	struct file *fp;
	u_long cmd;
	register caddr_t data;
	struct proc *p;
{
	register struct socket *so = (struct socket *)fp->f_data;

	switch (cmd) {

	case FIONBIO:
		if (*(int *)data)
			so->so_state |= SS_NBIO;
		else
			so->so_state &= ~SS_NBIO;
		return (0);

	case FIOASYNC:
		if (*(int *)data) {
			so->so_state |= SS_ASYNC;
			so->so_rcv.sb_flags |= SB_ASYNC;
			so->so_snd.sb_flags |= SB_ASYNC;
		} else {
			so->so_state &= ~SS_ASYNC;
			so->so_rcv.sb_flags &= ~SB_ASYNC;
			so->so_snd.sb_flags &= ~SB_ASYNC;
		}
		return (0);

	case FIONREAD:
		*(int *)data = so->so_rcv.sb_cc;
		return (0);

	case SIOCSPGRP:
		so->so_pgid = *(int *)data;
		so->so_siguid = p->p_cred->p_ruid;
		so->so_sigeuid = p->p_ucred->cr_uid;
		return (0);

	case SIOCGPGRP:
		*(int *)data = so->so_pgid;
		return (0);

	case SIOCATMARK:
		*(int *)data = (so->so_state&SS_RCVATMARK) != 0;
		return (0);
	}
	/*
	 * Interface/routing/protocol specific ioctls:
	 * interface and routing ioctls should have a
	 * different entry since a socket's unnecessary
	 */
	if (IOCGROUP(cmd) == 'i')
		return (ifioctl(so, cmd, data, p));
	if (IOCGROUP(cmd) == 'r')
		return (rtioctl(cmd, data, p));
	return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 
	    (struct mbuf *)cmd, (struct mbuf *)data, (struct mbuf *)0));
}

int
soo_poll(fp, events, p)
	struct file *fp;
	int events;
	struct proc *p;
{
	struct socket *so = (struct socket *)fp->f_data;
	int revents = 0;
	int s = splsoftnet();

	if (events & (POLLIN | POLLRDNORM)) {
		if (soreadable(so))
			revents |= events & (POLLIN | POLLRDNORM);
	}
	if (events & (POLLOUT | POLLWRNORM)) {
		if (sowriteable(so))
			revents |= events & (POLLOUT | POLLWRNORM);
	}
	if (events & (POLLPRI | POLLRDBAND)) {
		if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
			revents |= events & (POLLPRI | POLLRDBAND);
	}
	if (revents == 0) {
		if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
			selrecord(p, &so->so_rcv.sb_sel);
			so->so_rcv.sb_flags |= SB_SEL;
		}
		if (events & (POLLOUT | POLLWRNORM)) {
			selrecord(p, &so->so_snd.sb_sel);
			so->so_snd.sb_flags |= SB_SEL;
		}
	}
	splx(s);
	return (revents);
}

int
soo_stat(fp, ub, p)
	struct file *fp;
	struct stat *ub;
	struct proc *p;
{
	struct socket *so = (struct socket *)fp->f_data;

	bzero((caddr_t)ub, sizeof (*ub));
	ub->st_mode = S_IFSOCK;
	return ((*so->so_proto->pr_usrreq)(so, PRU_SENSE,
	    (struct mbuf *)ub, (struct mbuf *)0, 
	    (struct mbuf *)0));
}

/* ARGSUSED */
int
soo_close(fp, p)
	struct file *fp;
	struct proc *p;
{
	int error = 0;

	if (fp->f_data)
		error = soclose((struct socket *)fp->f_data);
	fp->f_data = 0;
	return (error);
}