libelf/common/next.c

	next.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "libelf.h"
#include "decl.h"


Elf_Cmd
elf_next(Elf * elf)
{
    Elf *parent;

    if (elf == 0)
        return (ELF_C_NULL);
    ELFRLOCK(elf)
    if ((parent = elf->ed_parent) == 0) {
        ELFUNLOCK(elf);
        return (ELF_C_NULL);
    }
    ELFWLOCK(parent)
    if (elf->ed_siboff >= parent->ed_fsz) {
        ELFUNLOCK(parent)
        ELFUNLOCK(elf);
        return (ELF_C_NULL);
    }

    parent->ed_nextoff = elf->ed_siboff;
    ELFUNLOCK(parent)
    ELFUNLOCK(elf);
    return (ELF_C_READ);
}