unsafe void UpdateSettings()
{
lock (_lock)
{
int ret;
int handle = _handle;
if (handle >= 0)
{
if (_settingsChanged)
{
int baudRate = _ser.BaudRate;
int dataBits = _ser.DataBits;
var parity = _ser.Parity;
int stopBits = _ser.StopBits;
ret = NativeMethods.retry(() => NativeMethods.cfsetspeed(ref _newSettings, (UIntPtr)Math.Max(1, baudRate)));
if (ret < 0)
{
throw new IOException("cfsetspeed failed.");
}
ulong cflag = (ulong)_newSettings.c_cflag;
// data bits
cflag &= ~NativeMethods.CSIZE;
if (dataBits == 7)
{
cflag |= NativeMethods.CS7;
}
else
{
cflag |= NativeMethods.CS8;
}
// parity bits
cflag &= ~NativeMethods.PARENB & ~NativeMethods.PARODD;
if (parity == SerialParity.Even)
{
cflag |= NativeMethods.PARENB;
}
else if (parity == SerialParity.Odd)
{
cflag |= NativeMethods.PARENB | NativeMethods.PARODD;
}
// stop bits
cflag &= ~NativeMethods.CSTOPB;
if (stopBits == 2)
{
cflag |= NativeMethods.CSTOPB;
}
_newSettings.c_cflag = (UIntPtr)cflag;
ret = NativeMethods.retry(() => NativeMethods.tcsetattr(handle, NativeMethods.TCSANOW, ref _newSettings));
if (ret < 0)
{
throw new IOException("tcsetattr failed.");
}
ret = NativeMethods.retry(() => NativeMethods.tcflush(handle, NativeMethods.TCIFLUSH));
if (ret < 0)
{
throw new IOException("tcflush failed.");
}
_settingsChanged = false;
}
}
}
}