stephane
use poll() instead of select() when possible
Currently libmodbus uses select() on Linux. If socket handle is greater than FD_SETSIZE select call causes application crash due to buffer overflow. Proposed pull request uses poll() instead of select() when available as well as fails attempts to call select on sockets >= FD_SETSIZE with EBADF. Situation with socket handle being greater that FD_SETSIZE is not uncommon for applications that keeps hundreds of connections.
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We require contributors to sign our Contributor License Agreement. In order for us to review and merge your code, please fill https://forms.gle/5635zjphDo5JEJQSA to get added. Your document will be manually checked by the maintainer. Be patient...
