livetrax/libs/appleutility/CoreAudio/PublicUtility/CACFMachPort.cpp

/*
     File: CACFMachPort.cpp
 Abstract: CACFMachPort.h
  Version: 1.1

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*/
//==================================================================================================
//	Includes
//==================================================================================================

#include "CACFMachPort.h"
#include "CAException.h"
#include "CADebugMacros.h"

//==================================================================================================
//	CACFMachPort
//==================================================================================================

//	This constructor is the short form. The CFMachPort will own the send and receive rights.
CACFMachPort::CACFMachPort(CFMachPortCallBack inCallBack, void* inUserData)
:
	mMachPort(NULL),
	mRunLoopSource(NULL),
	mOwnsPort(true)
{
	CFMachPortContext theContext = { 1, inUserData, NULL, NULL, NULL };
	mMachPort = CFMachPortCreate(NULL, inCallBack, &theContext, NULL);
	ThrowIfNULL(mMachPort, CAException('what'), "CACFMachPort::CACFMachPort(s): couldn't create the CFMachPort");

	mRunLoopSource = CFMachPortCreateRunLoopSource(NULL, mMachPort, 0);
	if(mRunLoopSource == NULL)
	{
		CFMachPortInvalidate(mMachPort);
		CFRelease(mMachPort);
		mMachPort = NULL;
		DebugMessage("CACFMachPort::CACFMachPort(s): couldn't create the CFRunLoopSource");
		throw CAException('what');
	}
}

//	This constructor is the general form:
//	-	If inMachPort is MACH_PORT_NULL, the CFMachPort will allocate the port and own the send and
//		receive rights. Otherwise, the caller owns the rights and is resposible for cleaning them
//		up.
//	-	If inCallBack is NULL, then received messages will just get swallowed by the CFMachPort.
//		This is useful if you are only using the CFMachPort to track port death (aka invalidation).
//	-	If inInvalidationCallBack is non-NULL, then it will be installed as the invalidation
//		callback on the CFMachPort.
CACFMachPort::CACFMachPort(mach_port_t inMachPort, CFMachPortCallBack inCallBack, CFMachPortInvalidationCallBack inInvalidationCallBack, void* inUserData)
:
	mMachPort(NULL),
	mRunLoopSource(NULL),
	mOwnsPort(false)
{
	CFMachPortContext theContext = { 1, inUserData, NULL, NULL, NULL };

	if(inMachPort == MACH_PORT_NULL)
	{
		mMachPort = CFMachPortCreate(NULL, inCallBack, &theContext, NULL);
		ThrowIfNULL(mMachPort, CAException('what'), "CACFMachPort::CACFMachPort: couldn't create the CFMachPort");
		mOwnsPort = true;
	}
	else
	{
		mMachPort = CFMachPortCreateWithPort(NULL, inMachPort, inCallBack, &theContext, NULL);
		ThrowIfNULL(mMachPort, CAException('what'), "CACFMachPort::CACFMachPort: couldn't create the CFMachPort with a port");
		mOwnsPort = false;
	}

	mRunLoopSource = CFMachPortCreateRunLoopSource(NULL, mMachPort, 0);
	if(mRunLoopSource == NULL)
	{
		if(mOwnsPort)
		{
			CFMachPortInvalidate(mMachPort);
		}
		CFRelease(mMachPort);
		mMachPort = NULL;
		DebugMessage("CACFMachPort::CACFMachPort: couldn't create the CFRunLoopSource");
		throw CAException('what');
	}

	if(inInvalidationCallBack != NULL)
	{
		CFMachPortSetInvalidationCallBack(mMachPort, inInvalidationCallBack);
	}
}

CACFMachPort::~CACFMachPort()
{
	if(mRunLoopSource != NULL)
	{
		CFRelease(mRunLoopSource);
	}

	if(mMachPort != NULL)
	{
		if(mOwnsPort)
		{
			CFMachPortInvalidate(mMachPort);
		}
		CFRelease(mMachPort);
	}
}

kern_return_t	CACFMachPort::ReceiveMessage(UInt32 inMaxMessageSize, mach_msg_header_t* outMessage, mach_msg_timeout_t inTimeOut)
{
	//	snag the port
	mach_port_t thePort = CFMachPortGetPort(mMachPort);

	//	fill out the message header
	outMessage->msgh_bits = 0;
	outMessage->msgh_size = 0;
	outMessage->msgh_remote_port = MACH_PORT_NULL;
	outMessage->msgh_local_port = thePort;
	outMessage->msgh_reserved = 0;
	outMessage->msgh_id = 0;

	//	figure the options
	mach_msg_options_t theOptions = MACH_RCV_MSG;
	if(inTimeOut > 0)
	{
		theOptions |= MACH_RCV_TIMEOUT;
	}

	//	receive the messsage
	return mach_msg(outMessage, theOptions, 0, inMaxMessageSize, thePort, inTimeOut, MACH_PORT_NULL);
}