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-rw-r--r--win/tclWinSerial.c29
1 files changed, 17 insertions, 12 deletions
diff --git a/win/tclWinSerial.c b/win/tclWinSerial.c
index 75d5ffc..0730a46 100644
--- a/win/tclWinSerial.c
+++ b/win/tclWinSerial.c
@@ -932,7 +932,7 @@ SerialInputProc(
bufSize = cStat.cbInQue;
}
} else {
- errno = *errorCode = EAGAIN;
+ errno = *errorCode = EWOULDBLOCK;
return -1;
}
} else {
@@ -1034,7 +1034,7 @@ SerialOutputProc(
* the channel is in non-blocking mode.
*/
- errno = EAGAIN;
+ errno = EWOULDBLOCK;
goto error1;
}
@@ -1410,23 +1410,22 @@ SerialWriterThread(
/*
*----------------------------------------------------------------------
*
- * TclWinSerialReopen --
+ * TclWinSerialOpen --
*
- * Reopens the serial port with the OVERLAPPED FLAG set
+ * Opens or Reopens the serial port with the OVERLAPPED FLAG set
*
* Results:
- * Returns the new handle, or INVALID_HANDLE_VALUE. Normally there
- * shouldn't be any error, because the same channel has previously been
- * succeesfully opened.
+ * Returns the new handle, or INVALID_HANDLE_VALUE.
+ * If an existing channel is specified it is closed and reopened.
*
* Side effects:
- * May close the original handle
+ * May close/reopen the original handle
*
*----------------------------------------------------------------------
*/
HANDLE
-TclWinSerialReopen(
+TclWinSerialOpen(
HANDLE handle,
const TCHAR *name,
DWORD access)
@@ -1434,16 +1433,22 @@ TclWinSerialReopen(
SerialInit();
/*
+ * If an open channel is specified, close it
+ */
+
+ if ( handle != INVALID_HANDLE_VALUE && CloseHandle(handle) == FALSE) {
+ return INVALID_HANDLE_VALUE;
+ }
+
+ /*
* Multithreaded I/O needs the overlapped flag set otherwise
* ClearCommError blocks under Windows NT/2000 until serial output is
* finished
*/
- if (CloseHandle(handle) == FALSE) {
- return INVALID_HANDLE_VALUE;
- }
handle = CreateFile(name, access, 0, 0, OPEN_EXISTING,
FILE_FLAG_OVERLAPPED, 0);
+
return handle;
}