internal static MacSerialDevice TryCreate(NativeMethods.io_string_t path)
{
var d = new MacSerialDevice()
{
_path = path
};
var handle = NativeMethods.IORegistryEntryFromPath(0, ref path).ToIOObject();
if (!handle.IsSet)
{
return(null);
}
using (handle)
{
d._fileSystemName = NativeMethods.IORegistryEntryGetCFProperty_String(handle, NativeMethods.kIOCalloutDeviceKey);
if (d._fileSystemName == null)
{
return(null);
}
}
return(d);
}
internal MacSerialStream(MacSerialDevice device)
: base(device)
{
string fileSystemName = device.GetFileSystemName();
int ret;
int handle = NativeMethods.retry(() => NativeMethods.open(fileSystemName, NativeMethods.oflag.RDWR | NativeMethods.oflag.NOCTTY | NativeMethods.oflag.NONBLOCK));
if (handle < 0)
{
var error = (NativeMethods.error)Marshal.GetLastWin32Error();
if (error == NativeMethods.error.EACCES)
{
throw DeviceException.CreateUnauthorizedAccessException(device, "Not permitted to open serial device at " + fileSystemName + ".");
}
else
{
throw DeviceException.CreateIOException(device, "Unable to open serial device (" + error.ToString() + ").");
}
}
ret = NativeMethods.retry(() => NativeMethods.ioctl(handle, NativeMethods.TIOCEXCL));
if (ret < 0)
{
NativeMethods.retry(() => NativeMethods.close(handle));
throw new IOException("Unable to open serial device exclusively.");
}
/*
* ret = NativeMethods.retry(() => NativeMethods.fcntl(handle, NativeMethods.F_SETFL, 0));
* if (ret < 0)
* {
* NativeMethods.retry(() => NativeMethods.ioctl(handle, NativeMethods.TIOCNXCL));
* NativeMethods.retry(() => NativeMethods.close(handle));
* throw new IOException("Unable to remove blocking from port.");
* }
*/
ret = NativeMethods.retry(() => NativeMethods.tcgetattr(handle, out _oldSettings));
if (ret < 0)
{
NativeMethods.retry(() => NativeMethods.ioctl(handle, NativeMethods.TIOCNXCL));
NativeMethods.retry(() => NativeMethods.close(handle));
throw new IOException("Unable to get serial port settings.");
}
_newSettings = _oldSettings;
NativeMethods.cfmakeraw(ref _newSettings);
_handle = handle;
InitSettings();
UpdateSettings();
}
protected override bool TryCreateSerialDevice(object key, out Device device)
{
device = MacSerialDevice.TryCreate((NativeMethods.io_string_t)key);
return(device != null);
}