1/*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2006 Ulrich Drepper <drepper@redhat.com>
7 * Copyright (c) 2006 Bernhard Kaindl <bk@suse.de>
8 * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include "defs.h"
35
36static int
37decode_readlink(struct tcb *tcp, int offset)
38{
39	if (entering(tcp)) {
40		printpath(tcp, tcp->u_arg[offset]);
41		tprints(", ");
42	} else {
43		if (syserror(tcp))
44			printaddr(tcp->u_arg[offset + 1]);
45		else
46			/* Used to use printpathn(), but readlink
47			 * neither includes NUL in the returned count,
48			 * nor actually writes it into memory.
49			 * printpathn() would decide on printing
50			 * "..." continuation based on garbage
51			 * past return buffer's end.
52			 */
53			printstr(tcp, tcp->u_arg[offset + 1], tcp->u_rval);
54		tprintf(", %lu", tcp->u_arg[offset + 2]);
55	}
56	return 0;
57}
58
59SYS_FUNC(readlink)
60{
61	return decode_readlink(tcp, 0);
62}
63
64SYS_FUNC(readlinkat)
65{
66	if (entering(tcp))
67		print_dirfd(tcp, tcp->u_arg[0]);
68	return decode_readlink(tcp, 1);
69}
70