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Up to [local] / src / usr.bin / sndiod

Add API to control audio device parameters exposed by sndiod.

The API exposes controls of modern audio hardware and sndiod software
volume knobs in a uniform way.  Hardware knobs are exposed through
sndiod.  Multiple programs may use the controls at the same time
without the need to continuously scan the controls.

For now sndiod exposes only its own controls and the master output and
input volumes of the underlying hardware (if any), i.e. those
typically exposed by acpi volume keys.

ok deraadt

/*	$OpenBSD: fdpass.h,v 1.3 2020/02/26 13:53:58 ratchov Exp $	*/
/*
 * Copyright (c) 2015 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.
 */
#ifndef FDPASS_H
#define FDPASS_H

struct fileops;

struct fdpass *fdpass_new(int sock, struct fileops *ops);
void fdpass_close(struct fdpass *f);

extern struct fileops worker_fileops, helper_fileops;
extern struct fdpass *fdpass_peer;

struct sio_hdl *fdpass_sio_open(int, int, unsigned int);
struct mio_hdl *fdpass_mio_open(int, int, unsigned int);
struct sioctl_hdl *fdpass_sioctl_open(int, int, unsigned int);

#endif /* !defined(FDPASS_H) */