Joel Sherrill commented on a discussion: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1095#note_144866


That is the function I was referring to. I was referencing it as an example of 
one you might have missed. [POSIX Issue 
8](https://publications.opengroup.org/c243) can be browsed online or downloaded 
as a PDF. You need a free membership in The Open Group to download the PDF. 
Search in that document for _ENAMETOOLONG_ and see if the two places you 
covered leave any other paths needing attention oin libcsupport or posix were 
missed. Do not worry about the networking functions that return it.

If you can set a breakpoint on the error being returned and see it hit, it 
should be OK for code coverage purposes. But for functional verification 
against the POSIX standard, having a test for each file function that can 
return ENAMETOOLONG is better.

-- 
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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1095#note_144866
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