Hello!

I "created" a library for working with serial port to Qt4 in asynchronous mode, while using as a base - QextSerialPort and the full of his altered.

My class is inherited from QIODevice.

Problems arise when working in Qt 4.3.4 under ArchLinux x86_64, which is that if the function bytesAvaiable() call inside a function readDAta() - a function bytesAvaiable() returns an incorrect number of bytes = 16384! o_O

Implementation bytesAvaiable () for POSIX:
Qt Code: 
  1. qint64 TPosixSerialDevice::bytesAvailable()
  2. {
  3.     if (isOpen()) {
  4.         int bytesQueued=0;
  5.  
  6.         if (ioctl(fd, FIONREAD, &bytesQueued)==-1) {
  7.             TTY_PORTABILITY_DEBUG("TPosixSerialDevice::bytesAvailable->ioctl(FIONREAD)! Error!");
  8.             return -1;
  9.         }
  10.         return bytesQueued + QIODEvice:: bytesAvaiable() ;
  11.     }//if isOpen()
  12.     TTY_PORTABILITY_DEBUG("TPosixSerialDevice::bytesAvailable->Device is not open! Error!");
  13.     return -1;
  14. }
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So:
1. If you do it like this:
Qt Code: 
  1. int main(int argc, char *argv[])
  2. {
  3.     QCoreApplication app(argc, argv);
  4.     TSerialDevice *MyDevice; //	where TSerialDevice - the heir of QIODEvice!
  5.  
  6.     MyDevice = new TSerialDevice();
  7.     if (!MyDevice->open(QIODevice::ReadWrite)) {
  8. 	return 0;
  9.     }
  10.     if (MyDevice->waitForReadyRead(3000)) { //wait data 3 sec
  11.     	cout << "Data is ready" << endl;
  12. 	int bav = MyDevice->bytesAvailable(); // <========== HERE returning the proper number of bytes in the reception buffer!
  13.     }
  14.     cout << "End for";
  15.     MyDevice->close();
  16.     cout << "End Close";
  17.  
  18.     return app.exec();
  19. }
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then the function MyDevice-> bytesAvailable () - returns all right!

2. If you do it like this:
Qt Code: 
  1. int main(int argc, char *argv[])
  2. {
  3.     QCoreApplication app(argc, argv);
  4.     TSerialDevice *MyDevice; //where TSerialDevice - the heir of QIODEvice!
  5.  
  6.     MyDevice = new TSerialDevice();
  7.     if (!MyDevice->open(QIODevice::ReadWrite)) {
  8. 	return 0;
  9.     }
  10.     if (MyDevice->waitForReadyRead(3000)) { //wait data 3 sec
  11.     	cout << "Data is ready" << endl;
  12. 	QBytesArray ba = MyDevice->read(); // HERE DOES NOT RIGHT!
  13.     }
  14.     cout << "End for";
  15.     MyDevice->close();
  16.     cout << "End Close";
  17.  
  18.     return app.exec();
  19. }
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ie if you call read (), which is readData (), which is called bytesAvailable () - it bytesAvailable () returns an incorrect value = 16384!

Implementation readData() for POSIX
Qt Code: 
  1. qint64 TPosixSerialDevice::readData(char * data, qint64 maxSize)
  2. {
  3.     int bytesRead=0;//the number of bytes actually read in one pass
  4.     int retVal=0;//the number of bytes actually read all the passages
  5.     int bav=0;// the number of bytes ready to read, which are currently in the reception buffer, the serial device
  6.     do {
  7.         if (maxSize>retVal) {
  8.             bav=bytesAvailable(); // <===========  THIS RETURN INCORRECT VALUE = 16384 !!! о_О
  9.             if (bav>0) {
  10.                 if ((maxSize-retVal)<=bav) {
  11.                     bav=maxSize-retVal;
  12.                 }
  13. 				bytesRead = ::read(fd, (void*)(data+retVal), bav);
  14.                 if  (bytesRead==-1) {
  15.                 	TTY_PORTABILITY_DEBUG("TPosixSerialDevice::readData->bytesRead==-1! Error!");
  16.                     return -1;
  17.                 }//if read == -1
  18.                 else {
  19.                     if (bytesRead==bav) {
  20.                         retVal+=bytesRead;//with OK
  21.                     }//if bytesRead==bav
  22.                     else {
  23.                         TTY_PORTABILITY_DEBUG("TPosixSerialDevice::readData->(bytesRead!=bav) with OK! Error!");
  24.                         return -1;
  25.                     }//else bytesRead!=bav
  26.                 }//else read
  27.             }//if bav>0
  28.             else {
  29.                 TTY_PORTABILITY_DEBUG("TPosixSerialDevice::readData-> (bav<=0)! Error!");
  30.                 return -1;
  31.             }//else bav<=0
  32.         }//if maxSize>retVal
  33.         else {
  34.             return retVal;
  35.         }
  36.     } while (waitForReadyRead(parameters->charIntervalTimeout));//forward to coming to the reception buffer device next character
  37.     return retVal;
  38. }
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At the same time when testing in Qt4.1 under Windows - that no error!

Help to understand what's wrong! : (

PS:
source code library and examples can be downloaded at the forum: http://www.prog.org.ru/topic_9537_0.html
there must be pre-registered. Downloads: QSerialDevce.tar.bz2 attached as an attachment.