fix(open): use FILETABLE-aware openat_into_posix to keep fd tables in sync

redox-rt/src/sys.rs

@@ -610,13 +610,8 @@ pub fn open<T: AsRef<str>>(path: T, flags: usize) -> Result<usize> {
     let _siglock = tmp_disable_signals();
 
     let ns_fd = crate::current_namespace_fd()?;
-
-    let posix_fd = syscall::openat(
-        ns_fd,
-        path.as_ref(),
-        flags,
-        0,
-    );
+    let fcntl_flags = flags & syscall::O_FCNTL_MASK;
+    let posix_fd = openat_into_posix(ns_fd, path.as_ref(), flags, fcntl_flags);
     if let Err(ref e) = posix_fd {
         let p = path.as_ref();
         let mut buf = [0u8; 256];
@@ -640,7 +635,6 @@ pub fn open<T: AsRef<str>>(path: T, flags: usize) -> Result<usize> {
         let _ = syscall::write(2, &buf[..len]);
     }
     let posix_fd = posix_fd?;
-    register_external_fd(posix_fd)?;
 
     Ok(posix_fd)
 }