anchao opened a new pull request #1048:
URL: https://github.com/apache/incubator-nuttx/pull/1048
## Summary
SO_ERROR is used to report asynchronous errors that are the result
of events within the network stack and not synchronous errors that
are the result of a library call(send/recv/connect)
Synchronous results are reported via errno.
Linux Programmer's Manual
...
NAME
getsockopt, setsockopt - get and set options on sockets
...
RETURN VALUE
...
On error, -1 is returned, and errno is set appropriately
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