fchdir() does not fail with EBADF when it should

[bhaible]

POSIX ​https://pubs.opengroup.org/onlinepubs/9799919799/functions/unlink.html specifies that the fchdir() function "shall fail" with error code EBADF if "The fildes argument is not an open file descriptor."

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 = -1, errno == EBADF
OK

Actual output:

ret = -1, errno == Invalid Argument
a.out: foo.c:21:main: ret < 0 && errno == EBADF
Kill Thread

[bhaible]

test case foo.c