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+[[!meta copyright="Copyright © 1994, 1995, 1996, 1997, 1998, 1999, 2002, 2009
+Free Software Foundation, Inc."]]
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled [[GNU Free Documentation
+[[!meta title="dir_link"]]
+ routine dir_link (
+ dir: file_t;
+ file: file_t;
+ name: string_t;
+ excl: int);
+Create a hard link.
+If `dir` and `file` are not implemented by the same filesystem, `EXDEV` should
+be returned. If the two filesystems, however can inter-operate and guarantee
+the appropriate POSIX semantics, they can communicate by a private protocol and
+allow hard links between them. If `excl` is set, then fail if `name` already
+exists in `dir`.