On Feb 29 11:37, Åke Rehnman wrote: > > On 2020-02-28 20:23, Corinna Vinschen wrote: > > > - Is it a safe bet that ClearCommError returns valid values in > > st.cbInQue even if one of the error conditions occur? Maybe the > > right thing to do is to return 0 in certain error cases...? > > The win32 api documentation does not mention anything about not returning > proper device status as long as the function succeeds... > > Anyhow in my pursuit for the truth I whipped up a small test program and > strace:d it (with some extra debug printout in fhandler_serial::ioctl) > > 127 2403456 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=7 > 216 3406481 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=E > 90 4409676 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=15 > 141 5413027 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=1C > 129 6416204 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=23 > 121 7419254 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=2A > 203 8423829 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=31 > 89 9427183 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=38 > 131 10431271 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=3F > 118 11435254 [main] python2.7 1662 fhandler_serial::ioctl: 0 = ioctl(541B, > 0xFFFFBCB0) ev=C st.cbInQue=46 > > > > > - Did you actually try if this fixes your problem? It's pretty > > simple to build the Cygwin DLL > > https://cygwin.com/faq.html#faq.programming.building-cygwin > > I patched it yesterday and it solved the problem... > > /Ake
I pushed a patch. Thanks, Corinna -- Corinna Vinschen Cygwin Maintainer
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