1260684Skaiw/*- 2260684Skaiw * Copyright (c) 2006,2008-2011 Joseph Koshy 3260684Skaiw * All rights reserved. 4260684Skaiw * 5260684Skaiw * Redistribution and use in source and binary forms, with or without 6260684Skaiw * modification, are permitted provided that the following conditions 7260684Skaiw * are met: 8260684Skaiw * 1. Redistributions of source code must retain the above copyright 9260684Skaiw * notice, this list of conditions and the following disclaimer. 10260684Skaiw * 2. Redistributions in binary form must reproduce the above copyright 11260684Skaiw * notice, this list of conditions and the following disclaimer in the 12260684Skaiw * documentation and/or other materials provided with the distribution. 13260684Skaiw * 14260684Skaiw * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15260684Skaiw * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16260684Skaiw * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17260684Skaiw * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18260684Skaiw * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19260684Skaiw * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20260684Skaiw * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21260684Skaiw * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22260684Skaiw * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23260684Skaiw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24260684Skaiw * SUCH DAMAGE. 25260684Skaiw */ 26260684Skaiw 27260684Skaiw#include <libelf.h> 28260684Skaiw 29260684Skaiw#include "_libelf.h" 30260684Skaiw 31260684SkaiwELFTC_VCSID("$Id: elf_begin.c 2364 2011-12-28 17:55:25Z jkoshy $"); 32260684Skaiw 33260684SkaiwElf * 34260684Skaiwelf_begin(int fd, Elf_Cmd c, Elf *a) 35260684Skaiw{ 36260684Skaiw Elf *e; 37260684Skaiw 38260684Skaiw e = NULL; 39260684Skaiw 40260684Skaiw if (LIBELF_PRIVATE(version) == EV_NONE) { 41260684Skaiw LIBELF_SET_ERROR(SEQUENCE, 0); 42260684Skaiw return (NULL); 43260684Skaiw } 44260684Skaiw 45260684Skaiw switch (c) { 46260684Skaiw case ELF_C_NULL: 47260684Skaiw return (NULL); 48260684Skaiw 49260684Skaiw case ELF_C_WRITE: 50260684Skaiw /* 51260684Skaiw * The ELF_C_WRITE command is required to ignore the 52260684Skaiw * descriptor passed in. 53260684Skaiw */ 54260684Skaiw a = NULL; 55260684Skaiw break; 56260684Skaiw 57260684Skaiw case ELF_C_RDWR: 58260684Skaiw if (a != NULL) { /* not allowed for ar(1) archives. */ 59260684Skaiw LIBELF_SET_ERROR(ARGUMENT, 0); 60260684Skaiw return (NULL); 61260684Skaiw } 62260684Skaiw /*FALLTHROUGH*/ 63260684Skaiw case ELF_C_READ: 64260684Skaiw /* 65260684Skaiw * Descriptor `a' could be for a regular ELF file, or 66260684Skaiw * for an ar(1) archive. If descriptor `a' was opened 67260684Skaiw * using a valid file descriptor, we need to check if 68260684Skaiw * the passed in `fd' value matches the original one. 69260684Skaiw */ 70260684Skaiw if (a && 71260684Skaiw ((a->e_fd != -1 && a->e_fd != fd) || c != a->e_cmd)) { 72260684Skaiw LIBELF_SET_ERROR(ARGUMENT, 0); 73260684Skaiw return (NULL); 74260684Skaiw } 75260684Skaiw break; 76260684Skaiw 77260684Skaiw default: 78260684Skaiw LIBELF_SET_ERROR(ARGUMENT, 0); 79260684Skaiw return (NULL); 80260684Skaiw 81260684Skaiw } 82260684Skaiw 83260684Skaiw if (a == NULL) 84260684Skaiw e = _libelf_open_object(fd, c, 1); 85260684Skaiw else if (a->e_kind == ELF_K_AR) 86260684Skaiw e = _libelf_ar_open_member(a->e_fd, c, a); 87260684Skaiw else 88260684Skaiw (e = a)->e_activations++; 89260684Skaiw 90260684Skaiw return (e); 91260684Skaiw} 92