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Stop binding audio devices exposed by sndiod to physical devices

This a shift towards a new model: clients connect to logical devices
(created with -s option) then the server routes data to/from the
underlying physical device (registered with -f option). The binding
may be changed at run-time with the server.device control exposed by
sndioctl(1).

As audio devices exposed by sndiod(8) are not bound to fixed physical
devices anymore, the physical audio device number component of
sndio(7) descriptors was removed.

fixes, help from and ok denis, edd

/*	$OpenBSD: miofile.c,v 1.9 2021/11/01 14:43:25 ratchov Exp $	*/
/*
 * Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
 *
 * 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 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/time.h>

#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sndio.h>
#include "defs.h"
#include "fdpass.h"
#include "file.h"
#include "midi.h"
#include "miofile.h"
#include "utils.h"

int  port_mio_pollfd(void *, struct pollfd *);
int  port_mio_revents(void *, struct pollfd *);
void port_mio_in(void *);
void port_mio_out(void *);
void port_mio_hup(void *);

struct fileops port_mio_ops = {
	"mio",
	port_mio_pollfd,
	port_mio_revents,
	port_mio_in,
	port_mio_out,
	port_mio_hup
};

int
port_mio_open(struct port *p)
{
	p->mio.hdl = fdpass_mio_open(p->num, p->midi->mode);
	if (p->mio.hdl == NULL)
		return 0;
	p->mio.file = file_new(&port_mio_ops, p, "port", mio_nfds(p->mio.hdl));
	return 1;
}

void
port_mio_close(struct port *p)
{
	file_del(p->mio.file);
	mio_close(p->mio.hdl);
}

int
port_mio_pollfd(void *addr, struct pollfd *pfd)
{
	struct port *p = addr;
	struct midi *ep = p->midi;
	int events = 0;

	if (ep->mode & MODE_MIDIIN)
		events |= POLLIN;
	if ((ep->mode & MODE_MIDIOUT) && ep->obuf.used > 0)
		events |= POLLOUT;
	return mio_pollfd(p->mio.hdl, pfd, events);
}

int
port_mio_revents(void *addr, struct pollfd *pfd)
{
	struct port *p = addr;

	return mio_revents(p->mio.hdl, pfd);
}

void
port_mio_in(void *arg)
{
	unsigned char data[MIDI_BUFSZ];
	struct port *p = arg;
	struct midi *ep = p->midi;
	int n;

	for (;;) {
		n = mio_read(p->mio.hdl, data, MIDI_BUFSZ);
		if (n == 0)
			break;
		midi_in(ep, data, n);
	}
}

void
port_mio_out(void *arg)
{
	struct port *p = arg;
	struct midi *ep = p->midi;
	unsigned char *data;
	int n, count;

	for (;;) {
		data = abuf_rgetblk(&ep->obuf, &count);
		if (count == 0)
			break;
		n = mio_write(p->mio.hdl, data, count);
		if (n == 0)
			break;
		abuf_rdiscard(&ep->obuf, n);
		if (n < count)
			break;
	}
	if (p->state == PORT_DRAIN && ep->obuf.used == 0)
		port_close(p);
	midi_fill(ep);
}

void
port_mio_hup(void *arg)
{
	struct port *p = arg;

	port_migrate(p);
	midi_abort(p->midi);
	if (p->state != PORT_CFG)
		port_close(p);
}