.IR dirp .
.LP
This descriptor is the one used internally by the directory stream.
-As a result, it is only useful for functions which do not depend on
+As a result, it is useful only for functions which do not depend on
or alter the file position, such as
.BR fstat (2)
and
.SH NOTES
The prototype for
.BR dirfd ()
-is only available if
+is available only if
.B _BSD_SOURCE
or
.B _SVID_SOURCE