Chris Johns commented: 
https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/work_items/101#note_155744


LibBSD lacks support for `fcntl(.*)` and `libcsupport` uses that call to 
implement `dup()` and `dup2()`. You can see limit set of cases supported in 
[rtems_bsd_sysgen_fcntl()](https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/blob/7-freebsd-14/rtemsbsd/rtems/rtems-bsd-syscall-api.c?ref_type=heads#L1514).

And I think the default case is wrong and an error should be returned. The Open 
Group's 
[fcnlt()](https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html)
 seems to indicate this?

I think the place to start looking into this a test for the testsuite. Is this 
something you could do? It would be nice to have a test case that captures the 
EPICS use case.

---

**_Note_**: we have stopped support for `6-freebsd-12`. The branch is over 
50,000 commits behind `6-freebsd-14` and `7-freebsd-14`. If we resolve things 
on `7-freebsd-14` we can back port the fixes to `6-freebsd-14`.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/work_items/101#note_155744
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