fdopendir() does not fail with EBADF when it should

[bhaible]

POSIX ​https://pubs.opengroup.org/onlinepubs/9799919799/functions/fdopendir.html specifies that the fdopendir() function "shall fail" with error code EBADF if "The fd argument is not a valid file descriptor open for reading."

This does not work in Haiku hrev57823 (from 2024-07-15): it fails with error code EINVAL instead.

How to reproduce: Compile and run the attached test program.

gcc -Wall foo.c
./a.out

Expected output:

ret = NULL, errno == EBADF
OK

Actual output:

ret = NULL, errno == Invalid Argument
a.out: foo.c:21:main: ret < 0 && errno == EBADF
Kill Thread

[bhaible]

test case foo.c

[waddlesplash]

This one, at least, is fixed in hrev58058.