Connect to serial device - c++

Question

I'm trying to write bytes to an serialport, where I connect a relay.
Everything works fine, if I use C++ for this: (comments are german, sorry)
#include <fcntl.h>
#include <termios.h>
RelayProtocol::RelayProtocol()
{
// Create structure
struct termios options;
// Open Connection
_handle = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NDELAY);
// clear all flags
fcntl(_handle, F_SETFL, 0);
// Get current options
tcgetattr(_handle, &options);
// Set Boundrate (19200)
cfsetispeed(&options, B19200); // Input
cfsetospeed(&options, B19200); // Output
// Set serial-flags
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
options.c_cflag |= (CLOCAL | CREAD);
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
options.c_oflag &= ~OPOST;
options.c_cc[VMIN] = 0;
options.c_cc[VTIME] = 10;
// Flush settings
tcflush(_handle,TCIOFLUSH);
tcsetattr(_handle, TCSAFLUSH, &options);
fcntl(_handle, F_SETFL, FNDELAY);
fcntl(_handle, F_SETFL, 0);
// Initialize relay
SendCommand(1, 1, 0);
}
Now I tried the same using vala:
public static void main (string[] args) {
int handle = Posix.open ("/dev/ttyUSB0", Posix.O_RDWR | Posix.O_NOCTTY | O_NDELAY);
Posix.termios termios;
Posix.fcntl (handle, Posix.F_SETFL, 0);
Posix.tcgetattr (handle, out termios);
termios.c_ispeed = 19200;
termios.c_ospeed = 19200;
/* Configure serialport */
termios.c_cflag &= ~Posix.PARENB;
termios.c_cflag &= ~Posix.CSTOPB;
termios.c_cflag &= ~Posix.CSIZE;
termios.c_cflag |= Posix.CS8;
termios.c_cflag |= (Posix.CLOCAL | Posix.CREAD);
termios.c_lflag &= ~(Posix.ICANON | Posix.ECHO | Posix.ECHOE | Posix.ISIG);
termios.c_oflag &= ~Posix.OPOST;
termios.c_cc[Posix.VMIN] = 0;
termios.c_cc[Posix.VTIME] = 10;
Posix.tcflush (handle, Posix.TCIOFLUSH);
Posix.tcsetattr (handle, Posix.TCSAFLUSH, termios);
Posix.fcntl (handle, Posix.F_SETFL, FNDELAY);
Posix.fcntl (handle, Posix.F_SETFL, 0);
/* Everything works fine, if I open it using tail -f /dev/ttyUSB0*/
uint8[] data = new uint8[4];
data[0] = 1;
data[1] = 1;
data[2] = 0;
data[3] = data[0] ^ data[1] ^ data[2];
int l = (int)Posix.write (handle, data, data.length);
Thread.usleep (1000 * 1000);
data[0] = make_array (2, true)[0];
data[1] = make_array (2, true)[1];
data[2] = make_array (2, true)[2];
data[3] = data[0] ^ data[1] ^ data[2];
l = (int)Posix.write (handle, data, data.length);
}
I have created two variables on the top, which doesn't exist in the posix namespace. I simply print the value in C.
This code in vala doesn't work, the relay doesn't receive anything, although it uses the same flags and handles.
The strange thing is, that the vala code works fine, if I open a terminal and run "tail -f /dev/ttyUSB0".
It seems that the valacode isn't able to initialize the serial port, so relay will never receive them.
Anybody know a fix for this, or find my mistake in the vala code?
Normally the librarys should be the same in both programming languages.