usr/src/cmd/sgs/libelf/common/next.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 Elf_Cmd
  37 elf_next(Elf * elf)
  38 {
  39         Elf     *parent;
  40
  41         if (elf == 0)
  42                 return (ELF_C_NULL);
  43         ELFRLOCK(elf)
  44         if ((parent = elf->ed_parent) == 0) {
  45                 ELFUNLOCK(elf);
  46                 return (ELF_C_NULL);
  47         }
  48         ELFWLOCK(parent)
  49         if (elf->ed_siboff >= parent->ed_fsz) {
  50                 ELFUNLOCK(parent)
  51                 ELFUNLOCK(elf);
  52                 return (ELF_C_NULL);
  53         }
  54
  55         parent->ed_nextoff = elf->ed_siboff;
  56         ELFUNLOCK(parent)
  57         ELFUNLOCK(elf);
  58         return (ELF_C_READ);
  59 }