libelf/common/getident.c

	getident.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"


char *
elf_getident(Elf *elf, size_t *ptr)
{
    size_t  sz = 0;
    char    *id = 0;

    if (elf != 0) {
        ELFRLOCK(elf)
        if (elf->ed_identsz != 0) {
            if ((elf->ed_vm == 0) || (elf->ed_status !=
                ES_COOKED)) {
                /*
                 * We need to upgrade to a Writers
                 * lock
                 */
                ELFUNLOCK(elf)
                ELFWLOCK(elf)
                if ((_elf_cook(elf) == OK_YES) &&
                    (_elf_vm(elf, (size_t)0,
                    elf->ed_identsz) == OK_YES)) {
                    id = elf->ed_ident;
                    sz = elf->ed_identsz;
                }
            } else {
                id = elf->ed_ident;
                sz = elf->ed_identsz;
            }
        }
        ELFUNLOCK(elf)
    }
    if (ptr != 0)
        *ptr = sz;
    return (id);
}