What is CreateIoCompletionPort function for linux,or android

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I want to controll for usb mass storage device in linux,android
when usb device is in act to change a file, i wanner get the file in usb mass storage.
There is source code for Windows,but linux or android isn't.
please help me!

void main(){
	HANDLE	SourceFile, IoPort;
        DWORD	nBytes;
          DWORD	vRet;
       DWORD	vFileSize;
      OVERLAPPED Overlapped;
    BYTE	*pBuf;
BOOL vStatus;
DWORD nFileSeek;
SourceFile = CreateFile("K:\\cmdtrans.bin",                             
						GENERIC_READ | GENERIC_WRITE,                             
						FILE_SHARE_READ,                             
						NULL,                             
						OPEN_EXISTING,                             
						FILE_FLAG_OVERLAPPED | FILE_FLAG_NO_BUFFERING,                            
						NULL);
if( SourceFile == INVALID_HANDLE_VALUE )	return;

IoPort = CreateIoCompletionPort(SourceFile,		//file handle to associate with I/O completion port.                                                              
								NULL,			//optional handle to existing I/O completion port.                                       
								0,				//completion key.                                       
								1);    
if( IoPort == NULL )	return;

vFileSize = GetFileSize(SourceFile, NULL);
//if( vFileSize != 65536 )	return;

pBuf = VirtualAlloc(NULL, vFileSize, MEM_COMMIT, PAGE_READWRITE);  

if( pBuf == NULL )	return;
gCapFlag =1
//SetFilePointer(SourceFile, 0, NULL, FILE_BEGIN);
while(gCapFlag)
{
	if( SetFilePointer(SourceFile, 0, NULL, FILE_BEGIN) == 0xFFFFFFFF )		break;

	Overlapped.Offset = 0;       
	Overlapped.OffsetHigh = 0;  
	Overlapped.hEvent = NULL;     // not needed
	
	vStatus = WriteFile(SourceFile,pBuf,512,&nBytes, &Overlapped);
	//if(vStatus){


	ReadFile(SourceFile, pBuf, 65536, &nBytes, &Overlapped);
	//memcpy(gImgBuffer,pBuf,vFileSize);

	//						//}
	// 						if(vStatus)	{
	DispFP( hWnd, pBuf, 65536 );
	// 						}
	ClearMessage();
}
OutputDebugString("breaked!!!");
//SetFilePointer(SourceFile, 0, NULL, FILE_BEGIN);
	CloseHandle(SourceFile);
	CloseHandle(IoPort);

	VirtualFree(pBuf, 65536, MEM_DECOMMIT);
}