usr/src/cmd/sgs/libelf/common/getident.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 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include "libelf.h"
  33 #include "decl.h"
  34
  35
  36 char *
  37 elf_getident(Elf *elf, size_t *ptr)
  38 {
  39         size_t  sz = 0;
  40         char    *id = 0;
  41
  42         if (elf != 0) {
  43                 ELFRLOCK(elf)
  44                 if (elf->ed_identsz != 0) {
  45                         if ((elf->ed_vm == 0) || (elf->ed_status !=
  46                             ES_COOKED)) {
  47                                 /*
  48                                  * We need to upgrade to a Writers
  49                                  * lock
  50                                  */
  51                                 ELFUNLOCK(elf)
  52                                 ELFWLOCK(elf)
  53                                 if ((_elf_cook(elf) == OK_YES) &&
  54                                     (_elf_vm(elf, (size_t)0,
  55                                     elf->ed_identsz) == OK_YES)) {
  56                                         id = elf->ed_ident;
  57                                         sz = elf->ed_identsz;
  58                                 }
  59                         } else {
  60                                 id = elf->ed_ident;
  61                                 sz = elf->ed_identsz;
  62                         }
  63                 }
  64                 ELFUNLOCK(elf)
  65         }
  66         if (ptr != 0)
  67                 *ptr = sz;
  68         return (id);
  69 }