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Revision 1.1, Fri Feb 1 05:27:37 2019 UTC (5 years, 4 months ago) by jsg
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6, OPENBSD_6_5_BASE, OPENBSD_6_5, HEAD 

add libelf from elftoolchain r3669

A 2 clause BSD licensed implementation of the SVR4 ELF API also
implemented by mr511.de libelf (devel/libelf in ports) and elfutils.

It is being added to base to allow Mesa to use it in future.

shlib major is higher than devel/libelf and pkg-config version is 0.8.2
to pass a glib2 configure test so this can replace the use of
devel/libelf in ports.

/*-
 * Copyright (c) 2006,2008-2011 Joseph Koshy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <libelf.h>

#include "_libelf.h"

ELFTC_VCSID("$Id: elf_begin.c,v 1.1 2019/02/01 05:27:37 jsg Exp $");

Elf *
elf_begin(int fd, Elf_Cmd c, Elf *a)
{
	Elf *e;

	e = NULL;

	if (LIBELF_PRIVATE(version) == EV_NONE) {
		LIBELF_SET_ERROR(SEQUENCE, 0);
		return (NULL);
	}

	switch (c) {
	case ELF_C_NULL:
		return (NULL);

	case ELF_C_WRITE:
		/*
		 * The ELF_C_WRITE command is required to ignore the
		 * descriptor passed in.
		 */
		a = NULL;
		break;

	case ELF_C_RDWR:
		if (a != NULL) { /* not allowed for ar(1) archives. */
			LIBELF_SET_ERROR(ARGUMENT, 0);
			return (NULL);
		}
		/*FALLTHROUGH*/
	case ELF_C_READ:
		/*
		 * Descriptor `a' could be for a regular ELF file, or
		 * for an ar(1) archive.  If descriptor `a' was opened
		 * using a valid file descriptor, we need to check if
		 * the passed in `fd' value matches the original one.
		 */
		if (a &&
		    ((a->e_fd != -1 && a->e_fd != fd) || c != a->e_cmd)) {
			LIBELF_SET_ERROR(ARGUMENT, 0);
			return (NULL);
		}
		break;

	default:
		LIBELF_SET_ERROR(ARGUMENT, 0);
		return (NULL);

	}

	if (a == NULL)
		e = _libelf_open_object(fd, c, 1);
	else if (a->e_kind == ELF_K_AR)
		e = _libelf_ar_open_member(a->e_fd, c, a);
	else
		(e = a)->e_activations++;

	return (e);
}