audio/utilities/AudioDevicectl.cc

	AudioDevicectl.cc revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1992-2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stropts.h>
#include <sys/ioctl.h>
#include <sys/stat.h>

#include <AudioDevicectl.h>

// class AudioDevicectl methods


// Constructor with optional path argument
AudioDevicectl::
AudioDevicectl(
	const char		*path):		// filename
	AudioDevice(path, (FileAccess)ReadWrite)
{
}


// Enable/disable SIGPOLL on state changes
AudioError AudioDevicectl::
SetSignal(
	Boolean		on)			// True to enable
{
	// Set the streams flag
	if (ioctl(getfd(), I_SETSIG, (on ? S_MSG : 0)) < 0)
		return (RaiseError(AUDIO_UNIXERROR));
	return (AUDIO_SUCCESS);
}

// Get input encoding
AudioHdr AudioDevicectl::
GetReadHeader()
{
	clearhdr();
	return (AudioDevice::GetReadHeader());
}


// Open an audio control device with the given name and mode
AudioError AudioDevicectl::
tryopen(
	const char	*devname,
	int)
{
	struct stat	st;
	char		*ctlname;
	int		desc;
	AudioInfo	info;
	AudioError	err;

	// If the name is changing, set the new one
	if (devname != GetName())
		SetName(devname);

	// XXX - convert name to device name, using audio config file
	// For now, append "ctl" to the device name
	ctlname = new char[strlen(devname) + 4];
	(void) strcpy(ctlname, devname);
	(void) strcat(ctlname, "ctl");

	// Check and open the control device.
	err = AUDIO_SUCCESS;
	if (stat(ctlname, &st) < 0) {
		err = AUDIO_UNIXERROR;
	} else if (!S_ISCHR(st.st_mode)) {
		err = AUDIO_ERR_NOTDEVICE;
	} else if ((desc = open(ctlname, O_RDWR)) < 0) {
		err = AUDIO_UNIXERROR;
	}
	delete ctlname;
	if (err)
		return (err);

	// Set the file descriptor (this marks the file open)
	setfd(desc);

	err = GetState(info);
	if (err != AUDIO_SUCCESS) {
		(void) close(desc);
		setfd(-1);
		return (err);
	}
	// Get the device type
	decode_devtype();

	return (AUDIO_SUCCESS);
}