dlizewski opened a new pull request, #11107:
URL: https://github.com/apache/nuttx/pull/11107
## Summary
#9647 added the ability to do runtime selection of usrsock and fallback to
kernel provided sockets, but the problem is that it currently requires the
application side usrsock daemon to be running in order to respond with -ENOSYS
or -ENOTSUP.
There is already code in usrsock that checks if there is an application side
daemon listening and returns -ENETDOWN if nothing is listening.
Specifically in "usrsock_request" in drivers/usrsock/usrsock_dev.c
Enabling fallback to kernel socket with -ENETDOWN allows the application to
not launch the usrsock daemon when not needed. Otherwise my application needs
to keep the daemon running for the sole purpose of saying it's off wasting
resources.
This was likely the original intention of original author based on the
comment in "usrsock_sockif_setup" which says:
```
/* Let the user socket logic handle the setup...
*
* A return value of zero means that the operation was
* successfully handled by usrsock. A negative value means that
* an error occurred. The special error value -ENETDOWN means
* that usrsock daemon is not running. The caller should attempt
* to open socket with kernel networking stack in this case.
*/
```
## Impact
## Testing
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