getphnum.c   [plain text]


/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"@(#)getphnum.c	1.1	05/11/17 SMI"

#include <string.h>
#include <gelf.h>
#include <decl.h>
#include <msg.h>

int
elf_getphnum(Elf *elf, size_t *phnum)
{
	GElf_Ehdr	ehdr;
	Elf_Scn		*scn;
	GElf_Shdr	shdr0;

	if (gelf_getehdr(elf, &ehdr) == NULL)
		return (0);

	if (ehdr.e_phnum != PN_XNUM) {
		*phnum = ehdr.e_phnum;
		return (1);
	}

	if ((scn = elf_getscn(elf, 0)) == NULL ||
	    gelf_getshdr(scn, &shdr0) == NULL)
		return (0);

	if (shdr0.sh_info == 0)
		*phnum = ehdr.e_phnum;
	else
		*phnum = shdr0.sh_info;

	return (1);
}