Change the DESCRIPTION of dirfd() from:

        The dirfd() function shall return a file descriptor referring
        to the same directory as the dirp argument.  This file
        descriptor shall be closed by a call to closedir().  If any
        attempt is made to close the file descriptor, or to modify
        the state of the associated description, other than by means
        of closedir(), readdir(), readdir_r(), or rewinddir(), the
        behavior is undefined.

on P723, L24327-24330 to:

        If the directory stream referenced by dirp has an
        associated file descriptor, dirfd() shall return that file
        descriptor.  Otherwise, dirfd() shall open a new file
        description referring to the directory associated with the
        directory stream as if by calling:

           open(DirectoryName, O_RDONLY | O_DIRECTORY | O_CLOEXEC);

        except that no pathname for use as DirectoryName need exist
    or be accessible.  It shall then associate the new file
    descriptor with the directory stream, and return that file
    descriptor.

        Upon successful return from dirfd(), the file descriptor
        is under the control of the system, and if any attempt is
        made to close the file descriptor, or to modify the state
        of the associated description other than by means of
        closedir(), readdir(), readdir_r(), rewinddir(),
        <XSI shaded>or seekdir()</XSI shaded>, the behavior is
        undefined.  Upon calling closedir() the file descriptor
        shall be closed.

Editor's note: The above change includes the change to L24330 specified
by the resolution of bug #422.

In the RETURN VALUE section, change:
        and may set errno
on P723, L24333 to:
        and shall set errno

In the ERRORS section, add the following after P723, L24335:
        The dirfd() function shall fail if:

        [EMFILE]        A new file descriptor is required and all file
                        descriptors available to the process are
                        currently open.

        [ENFILE]        A new file desciptor is required and the maximum
                        allowable number of files is currently open
                        in the system.

In the ERRORS section, delete the ENOTSUP may fail error on P723,
L24343-24344.