Branch data Line data Source code
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 : : * Copyright (c) 2014-2017 The strace developers.
10 : : * All rights reserved.
11 : : *
12 : : * Redistribution and use in source and binary forms, with or without
13 : : * modification, are permitted provided that the following conditions
14 : : * are met:
15 : : * 1. Redistributions of source code must retain the above copyright
16 : : * notice, this list of conditions and the following disclaimer.
17 : : * 2. Redistributions in binary form must reproduce the above copyright
18 : : * notice, this list of conditions and the following disclaimer in the
19 : : * documentation and/or other materials provided with the distribution.
20 : : * 3. The name of the author may not be used to endorse or promote products
21 : : * derived from this software without specific prior written permission.
22 : : *
23 : : * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 : : * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 : : * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 : : * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 : : * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 : : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 : : * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 : : * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 : : * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 : : * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 : : */
34 : :
35 : : #include "defs.h"
36 : :
37 : : static int
38 : 16 : decode_readlink(struct tcb *tcp, int offset)
39 : : {
40 [ + + ]: 16 : if (entering(tcp)) {
41 : 8 : printpath(tcp, tcp->u_arg[offset]);
42 : 8 : tprints(", ");
43 : : } else {
44 [ + + ]: 8 : if (syserror(tcp))
45 : 4 : printaddr(tcp->u_arg[offset + 1]);
46 : : else
47 : : /* Used to use printpathn(), but readlink
48 : : * neither includes NUL in the returned count,
49 : : * nor actually writes it into memory.
50 : : * printpathn() would decide on printing
51 : : * "..." continuation based on garbage
52 : : * past return buffer's end.
53 : : */
54 : 4 : printstrn(tcp, tcp->u_arg[offset + 1], tcp->u_rval);
55 : 8 : tprintf(", %" PRI_klu, tcp->u_arg[offset + 2]);
56 : : }
57 : 16 : return 0;
58 : : }
59 : :
60 : 8 : SYS_FUNC(readlink)
61 : : {
62 : 8 : return decode_readlink(tcp, 0);
63 : : }
64 : :
65 : 8 : SYS_FUNC(readlinkat)
66 : : {
67 [ + + ]: 8 : if (entering(tcp))
68 : 4 : print_dirfd(tcp, tcp->u_arg[0]);
69 : 8 : return decode_readlink(tcp, 1);
70 : : }
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