open() fails when the argument is a symbolic link to a nonexistent file

[bhaible]

POSIX ​https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html specifies that "In general, the open() function follows the symbolic link if path names a symbolic link." and lists a few conditions under which open(), when passed an argument that is a symbolic link, must fail. These conditions are not met when the argument is simply a symbolic link to a nonexistent file in an existing directory (such as the current directory). Therefore, in this case, the open() call should succeeds, and a regular file should be created at the place the symbolic link points to.

But in Haiku r1beta4, the open() calls fails with errno ENOENT.

How to reproduce:

$ gcc -Wall foo.c
$ ./a.out

Expected output:

symlink -> 0
ret -> 3

Actual output:

symlink -> 0
open: No such file or directory

[bhaible]

test case

[korli]

Proposed change: ​https://review.haiku-os.org/c/haiku/+/6321

[waddlesplash]

Fixed in hrev57507.