master: add comment

247f50e0 · David Wilson · bbcfc585 · 247f50e0
Commit 247f50e0 authored Nov 28, 2017 by David Wilson
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mitogen/master.py mitogen/master.py +3 -0

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--- a/mitogen/master.py
+++ b/mitogen/master.py
@@ -135,6 +135,9 @@ def cfmakeraw(tflags):
    cflag &= ~flags('CSIZE PARENB')
    cflag |= flags('CS8')

+    # TODO: one or more of the above bit twiddles sets or omits a necessary
+    # flag. Forcing these fields to zero, as shown below, gets us what we want
+    # on Linux/OS X, but it is possibly broken on some other OS.
    iflag = 0
    oflag = 0
    lflag = 0