RFR: 8357425: (fs) SecureDirectoryStream setPermissions should use fchmodat

[Brian Burkhalter]

On Fri, 30 May 2025 08:13:53 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> I think it means that it is not supported on AIX because some of the "at" calls don't exist

The pertinent code in `UnixNativeDispatcher.c` is

    /* supports openat, etc. */
 
    if (my_openat_func != NULL &&  my_fstatat_func != NULL &&
        my_unlinkat_func != NULL && my_renameat_func != NULL &&
        my_fdopendir_func != NULL)
    {
        capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_OPENAT;
    }

Maybe the list of "at" syscalls needs to be reexamined and/or made more fine grained (not for this PR)?

-------------

PR Comment: https://git.openjdk.org/jdk/pull/25534#issuecomment-2923085384