public int write(int fd, byte[] buffer, int length) {
Port port = getPort(fd);
if (port == null) return -1;
synchronized (port.m_WrBuffer) {
try {
if (port.m_WritePending > 0) {
while (true) {
int res = WaitForSingleObject(port.m_WrOVL.hEvent, INFINITE);
if (res == WAIT_TIMEOUT) {
clearCommErrors(port);
log =
log
&& log(
1,
"write pending, cbInQue %d cbOutQue %d\n",
port.m_COMSTAT.cbInQue,
port.m_COMSTAT.cbOutQue);
continue;
}
if (!GetOverlappedResult(port.m_Comm, port.m_WrOVL, port.m_WrN, false)) port.fail();
if (port.m_WrN[0]
!= port.m_WritePending) // I exptect this is never going to happen, if it does
new RuntimeException(
"Windows OVERLAPPED WriteFile failed to write all, tried to write "
+ port.m_WritePending
+ " but got "
+ port.m_WrN[0]);
break;
}
port.m_WritePending = 0;
}
if ((port.m_OpenFlags & O_NONBLOCK) != 0) {
if (!ClearCommError(port.m_Comm, port.m_WrErr, port.m_WrStat)) port.fail();
int room = (int) port.m_WrBuffer.size() - port.m_WrStat.cbOutQue;
if (length > room) length = room;
}
if (!ResetEvent(port.m_WrOVL.hEvent)) port.fail();
if (length > port.m_WrBuffer.size()) length = (int) port.m_WrBuffer.size();
port.m_WrBuffer.write(0, buffer, 0, length); // copy from buffer to Memory
boolean ok = WriteFile(port.m_Comm, port.m_WrBuffer, length, port.m_WrN, port.m_WrOVL);
if (!ok) {
if (GetLastError() != ERROR_IO_PENDING) port.fail();
port.m_WritePending = length;
}
//
return length; // port.m_WrN[0];
} catch (Fail f) {
return -1;
}
}
}
