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      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, 1994, 1995, 1996 Rick Sladkey <jrs (at) world.std.com>
      5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert (at) cistron.nl>
      6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
      7  *                     Linux for s390 port by D.J. Barrow
      8  *                    <barrow_dj (at) mail.yahoo.com,djbarrow (at) de.ibm.com>
      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 #include "ptrace.h"
     36 
     37 int
     38 upeek(int pid, unsigned long off, kernel_ulong_t *res)
     39 {
     40 	long val;
     41 
     42 	errno = 0;
     43 	val = ptrace(PTRACE_PEEKUSER, (pid_t) pid, (void *) off, 0);
     44 	if (val == -1 && errno) {
     45 		if (errno != ESRCH) {
     46 			perror_msg("upeek: PTRACE_PEEKUSER pid:%d @0x%lx)", pid, off);
     47 		}
     48 		return -1;
     49 	}
     50 	*res = (unsigned long) val;
     51 	return 0;
     52 }
     53