casaroli opened a new pull request, #3691:
URL: https://github.com/apache/nuttx-apps/pull/3691
## Summary
`dlopen()` of an already loaded library used to fail, so nothing exercised
what happens when two callers hold the same object.
This opens the library a second time, checks the same handle comes back,
closes one of the two handles and checks the library is still usable through
the other.
## Testing
Paired with apache/nuttx#19639; without that change the second `dlopen()`
returns `NULL` and this test reports it.
Run on `lm3s6965-ek` under QEMU with `CONFIG_EXAMPLES_SOTEST`, `CONFIG_ELF`,
`CONFIG_LIBC_ELF` and `CONFIG_LIBC_DLFCN`.
Without apache/nuttx#19639:
```
ERROR: dlopen(/mnt/sotest/romfs/sotest) failed on an already loaded library
```
With it:
```
testfunc3: Let's talk again very soon
caller: Yes, don't be a stranger!
testfunc1: Hello, everyone!
caller: Yes, don't be a stranger!
module_uninitialize
```
The repeated `testfunc1` is the library still working after one of the two
handles was closed, and `module_uninitialize` is it unloading once the last one
went.
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