ntdll: Implemented IOCTL for char transmission: IMMEDIATE_CHAR.

dlls/kernel/comm.c

@@ -1652,23 +1652,20 @@ BOOL WINAPI GetCommState(
  *  Transmits a single character in front of any pending characters in the
  *  output buffer.  Usually used to send an interrupt character to a host.
  *
+ * PARAMS
+ *      hComm           [in]    The communication device in need of a command character
+ *      chTransmit      [in]    The character to transmit
+ *
  * RETURNS
  *
  *  True if the call succeeded, false if the previous command character to the
  *  same device has not been sent yet the handle is bad etc.
  *
- * BUGS
- *
- *  Stub.
  */
-BOOL WINAPI TransmitCommChar(
-    HANDLE hComm,      /* [in] The communication device in need of a command character. */
-    CHAR   chTransmit) /* [in] The character to transmit. */
+BOOL WINAPI TransmitCommChar(HANDLE hComm, CHAR chTransmit)
 {
-    DWORD w;
-    WARN("(%p,'%c') not perfect!\n",hComm,chTransmit);
-
-    return WriteFile( hComm, &chTransmit, 1, &w, NULL );
+    return DeviceIoControl(hComm, IOCTL_SERIAL_IMMEDIATE_CHAR,
+                           &chTransmit, sizeof(chTransmit), NULL, 0, NULL, NULL);
 }
 
 

dlls/ntdll/serial.c

@@ -211,6 +211,15 @@ static NTSTATUS set_wait_mask(HANDLE hDevice, DWORD mask)
     return status;
 }
 
+static NTSTATUS xmit_immediate(HANDLE hDevice, int fd, char* ptr)
+{
+    /* FIXME: not perfect as it should bypass the in-queue */
+    WARN("(%p,'%c') not perfect!\n", hDevice, *ptr);
+    if (write(fd, ptr, 1) != 1)
+        return FILE_GetNtStatus();
+    return STATUS_SUCCESS;
+}
+
 /******************************************************************
  *		COMM_DeviceIoControl
  *
@@ -255,6 +264,12 @@ NTSTATUS COMM_DeviceIoControl(HANDLE hDevice,
         else
             status = STATUS_INVALID_PARAMETER;
         break;
+    case IOCTL_SERIAL_IMMEDIATE_CHAR:
+        if (lpInBuffer && nInBufferSize == sizeof(CHAR))
+            status = xmit_immediate(hDevice, fd, lpInBuffer);
+        else
+            status = STATUS_INVALID_PARAMETER;
+        break;
     case IOCTL_SERIAL_PURGE:
         if (lpInBuffer && nInBufferSize == sizeof(DWORD))
             status = purge(fd, *(DWORD*)lpInBuffer);