// TODO: Has close() race condition.
public unsafe override void Write(byte[] buffer, int offset, int count)
{
Throw.If.OutOfRange(buffer, offset, count);
UpdateSettings();
if (count == 0)
{
return;
}
fixed(byte *buffer0 = buffer)
{
int startTime = Environment.TickCount, writeTimeout = WriteTimeout;
for (int bytesWritten = 0; bytesWritten < count;)
{
int handle = _handle;
if (handle < 0)
{
throw new IOException("Closed.");
}
var bufferPtr = (IntPtr)(buffer0 + offset + bytesWritten);
int bytesToWrite = count - bytesWritten;
var fd = new NativeMethods.pollfd()
{
fd = handle, events = NativeMethods.pollev.OUT
};
int ret = NativeMethods.retry(() => NativeMethods.poll(ref fd, 1, GetTimeout(startTime, writeTimeout)));
if (ret < 0)
{
throw new IOException("Write failed (poll).");
}
if (ret == 1)
{
if (fd.revents != NativeMethods.pollev.OUT)
{
throw new IOException(string.Format("Closed during write ({0}).", fd.revents));
}
int writeCount = checked ((int)NativeMethods.retry(() => NativeMethods.write(handle, bufferPtr, (UIntPtr)bytesToWrite)));
if (writeCount <= 0 || writeCount > bytesToWrite)
{
throw new IOException("Write failed.");
}
bytesWritten += writeCount;
}
}
}
}
// TODO: Has close() race condition.
public unsafe override int Read(byte[] buffer, int offset, int count)
{
Throw.If.OutOfRange(buffer, offset, count);
UpdateSettings();
if (count == 0)
{
return(0);
}
fixed(byte *buffer0 = buffer)
{
int startTime = Environment.TickCount, readTimeout = ReadTimeout;
while (true)
{
int handle = _handle;
if (handle < 0)
{
throw new IOException("Closed.");
}
var bufferPtr = (IntPtr)(buffer0 + offset);
int bytesToRead = count;
var fd = new NativeMethods.pollfd()
{
fd = handle, events = NativeMethods.pollev.IN
};
int ret = NativeMethods.retry(() => NativeMethods.poll(ref fd, 1, GetTimeout(startTime, readTimeout)));
if (ret < 0)
{
throw new IOException("Read failed (poll).");
}
if (ret == 1)
{
if (fd.revents != NativeMethods.pollev.IN)
{
throw new IOException(string.Format("Closed during read ({0}).", fd.revents));
}
int readCount = checked ((int)NativeMethods.retry(() => NativeMethods.read(handle, bufferPtr, (UIntPtr)bytesToRead)));
if (readCount <= 0 || readCount > bytesToRead)
{
throw new IOException("Read failed.");
}
return(readCount);
}
}
}
}