extmod/modussl: fix socket and ussl read/write errors for non-blocking sockets #6615
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This was referenced Feb 9, 2021
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I rebased this on latest master in #6907 . |
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Merged in 2c1299b |
tannewt
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Jul 25, 2022
Beetle esp32 c3
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This PR replaces #5825 and is based on #6613
This PR attempts to make read and write behave identically on non-blocking sockets and on SSL wrappers with a non-blocking socket underneath. The goal is for stuff like EAGAIN and EINPROGRESS or None returns to be correct and the same. In the end, that makes it easier to write software that can use plain or SSL sockets.
The PR includes a test that checks all combinations for connect+op on non-blocking sockets with and without ssl (
net_hosted/connect_noblock.py). I've tested on esp32, pyboard and unix so far. I don't have any of the other platforms. The test passes on esp32 and fails on unix, the failure is because AXTLS can't quite do non-blocking SSL handshakes. The test fails on pyboard because trying to send 4 bytes on a non-blocking socket that hasn't connected succeeds when it should raise EAGAIN or EINPROGRESS.