usr/src/cmd/sgs/libelf/common/getbase.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 /*      Copyright (c) 1988 AT&T */
  27 /*        All Rights Reserved   */
  28
  29 #include <ar.h>
  30 #include "libelf.h"
  31 #include "decl.h"
  32
  33
  34 off_t
  35 elf_getbase(Elf *elf)
  36 {
  37         off_t   rc;
  38         if (elf == NULL)
  39                 return (-1);
  40         ELFRLOCK(elf)
  41         rc = elf->ed_baseoff;
  42         ELFUNLOCK(elf)
  43         return (rc);
  44 }
  45
  46 /*
  47  * Private function to obtain the offset of the archive header for
  48  * this archive member. The header directly precedes the base offset,
  49  * which is available via elf_getbase(), but we wish to isolate the
  50  * caller from implementation details that might change.
  51  *
  52  * Returns the offset on success, and -1 on failure.
  53  */
  54 off_t
  55 _elf_getarhdrbase(Elf *elf)
  56 {
  57         off_t   rc;
  58         if (elf == NULL)
  59                 return (-1);
  60         ELFRLOCK(elf)
  61         if (elf->ed_parent == NULL) {
  62                 _elf_seterr(EREQ_AR, 0);
  63                 ELFUNLOCK(elf);
  64                 return (-1);
  65         }
  66         rc = elf->ed_baseoff - sizeof (struct ar_hdr);
  67         ELFUNLOCK(elf)
  68         return (rc);
  69 }