/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 2006 Ulrich Drepper <drepper@redhat.com>
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* Copyright (c) 2006 Bernhard Kaindl <bk@suse.de>
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* Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2014-2017 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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static int
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decode_readlink(struct tcb *tcp, int offset)
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{
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if (entering(tcp)) {
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printpath(tcp, tcp->u_arg[offset]);
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tprints(", ");
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} else {
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if (syserror(tcp))
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printaddr(tcp->u_arg[offset + 1]);
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else
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/* Used to use printpathn(), but readlink
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* neither includes NUL in the returned count,
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* nor actually writes it into memory.
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* printpathn() would decide on printing
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* "..." continuation based on garbage
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* past return buffer's end.
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*/
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printstrn(tcp, tcp->u_arg[offset + 1], tcp->u_rval);
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tprintf(", %" PRI_klu, tcp->u_arg[offset + 2]);
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}
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return 0;
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}
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SYS_FUNC(readlink)
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{
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return decode_readlink(tcp, 0);
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}
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SYS_FUNC(readlinkat)
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{
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if (entering(tcp))
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print_dirfd(tcp, tcp->u_arg[0]);
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return decode_readlink(tcp, 1);
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}
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