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       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                 :            : 
      36                 :            : static int
      37                 :         48 : decode_readlink(struct tcb *tcp, int offset)
      38                 :            : {
      39         [ +  + ]:         48 :         if (entering(tcp)) {
      40                 :         24 :                 printpath(tcp, tcp->u_arg[offset]);
      41                 :         24 :                 tprints(", ");
      42                 :            :         } else {
      43         [ +  + ]:         24 :                 if (syserror(tcp))
      44                 :         12 :                         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                 :         12 :                         printstrn(tcp, tcp->u_arg[offset + 1], tcp->u_rval);
      54                 :         24 :                 tprintf(", %" PRI_klu, tcp->u_arg[offset + 2]);
      55                 :            :         }
      56                 :         48 :         return 0;
      57                 :            : }
      58                 :            : 
      59                 :         24 : SYS_FUNC(readlink)
      60                 :            : {
      61                 :         24 :         return decode_readlink(tcp, 0);
      62                 :            : }
      63                 :            : 
      64                 :         24 : SYS_FUNC(readlinkat)
      65                 :            : {
      66         [ +  + ]:         24 :         if (entering(tcp))
      67                 :         12 :                 print_dirfd(tcp, tcp->u_arg[0]);
      68                 :         24 :         return decode_readlink(tcp, 1);
      69                 :            : }