Openzwave Open serial port hangs on newest kernels

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What steps will reproduce the problem?
1. Run the test program and it hangs after Open serial port /dev/ttyUSB0

I am running Fedora 14. Another user reported the same issue with the latest 
'Ubuntu Maverick kernel'.

It appears the newer kernels will block on the open waiting for a
carrier detect (DCD) to be asserted. To solve, I added a O_NDELAY to the open. 
However that implies nonblocking, so once I open it, I switch the socket to 
BLOCKING mode which open-zwave requires.

Here is the patch to get it to work:

===================================================================
--- SerialControllerImpl.cpp    (revision 215)
+++ SerialControllerImpl.cpp    (working copy)
@@ -75,7 +75,10 @@
 {
        Log::Write( "Open serial port %s",
_SerialControllerName.c_str() );

-       m_hSerialController = open( _SerialControllerName.c_str(),
O_RDWR | O_NOCTTY, 0 );
+       m_hSerialController = open( _SerialControllerName.c_str(),
O_RDWR | O_NOCTTY | O_NDELAY, 0 );
+       int flags;
+       flags = fcntl(m_hSerialController, F_GETFL);
+       fcntl(m_hSerialController, F_SETFL, flags & (~O_NONBLOCK));

        if( -1 == m_hSerialController )
        {

Original issue reported on code.google.com by krbvr...@gmail.com on 14 Feb 2011 at 3:15

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Is this really still an issue?  I've used openzwave extensively on Ubuntu 
Maverick. May have been a transient kernel issue.

Original comment by pnau...@gmail.com on 17 Oct 2011 at 10:28

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Thanks for your solution! I managed to get to work on Centos 6 finally!

Original comment by conrad.v...@gmail.com on 15 Jan 2012 at 10:24

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Long since not an issue. 

Original comment by pnau...@gmail.com on 14 Aug 2012 at 3:04

• Changed state: Verified