use poll() instead of select() when possible #705
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…instead of crashing app if socket handle is greater than FD_SETSIZE
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Related to/fixes #583. |
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we have to get sure this does not break ESP32 compatibility on Serial Port, it seems VFS supports only select(). has to be tested. |
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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.