1 /* 2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk (at) cs.few.eur.nl> 3 * Copyright (c) 1993 Branko Lankester <branko (at) hacktic.nl> 4 * Copyright (c) 1993-1996 Rick Sladkey <jrs (at) world.std.com> 5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert (at) cistron.nl> 6 * Copyright (c) 2006 Ulrich Drepper <drepper (at) redhat.com> 7 * Copyright (c) 2006 Bernhard Kaindl <bk (at) suse.de> 8 * Copyright (c) 2006-2015 Dmitry V. Levin <ldv (at) 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 36 static int 37 decode_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 59 SYS_FUNC(readlink) 60 { 61 return decode_readlink(tcp, 0); 62 } 63 64 SYS_FUNC(readlinkat) 65 { 66 if (entering(tcp)) 67 print_dirfd(tcp, tcp->u_arg[0]); 68 return decode_readlink(tcp, 1); 69 } 70
