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Serial driver changes with QNX 6.4.x and disconnect/reconnect of lines

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Applicable Environment

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Topic: Serial driver changes with QNX 6.4.x and disconnect/reconnect of lines
SDP: 6.4.0, 6.4.1
Target: Any supported target

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Solution

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Starting from QNX 6.4.0, modem control is added to io-char library.
So if applications blocks reading on serial device and if unplugs/plugs the cable, read will return immediately. This behavior is different with 6.3.x.

You can disable this feature with "stty +clocal < /dev/serx" in 6.4.x then read will block like 6.3.x.

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NOTE: This entry has been validated against the SDP version listed above. Use caution when considering this advice for any other SDP version. For supported releases, please reach out to QNX Technical Support if you have any questions/concerns.

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