linkat() does not fail with EBADF when it should

[bhaible]

POSIX ​https://pubs.opengroup.org/onlinepubs/9799919799/functions/link.html specifies that the linkat() function "shall fail" with error code EBADF if "The path1 or path2 argument does not specify an absolute path and the fd1 or fd2 argument, respectively, is neither AT_FDCWD nor a valid file descriptor open for reading or searching."

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

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

gcc -Wall foo.c
./a.out

Expected output:

ret = -1, errno == EBADF
ret = -1, errno == EBADF
OK

Actual output:

ret = -1, errno == No such file or directory
ret = -1, errno == No such file or directory
a.out: foo.c:41:main: !fail
Kill Thread

[bhaible]

test case foo.c