2 * Copyright (c) 2006 Joseph Koshy
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/errno.h>
42 _libelf_open_object(int fd, Elf_Cmd c)
49 * 'Raw' files are always mapped with 'PROT_READ'. At
50 * elf_update(3) time for files opened with ELF_C_RDWR the
51 * mapping is unmapped, file data is written to using write(2)
52 * and then the raw data is immediately mapped back in.
54 if (fstat(fd, &sb) < 0) {
55 LIBELF_SET_ERROR(IO, errno);
60 if ((m = mmap(NULL, (size_t) sb.st_size, PROT_READ, MAP_PRIVATE, fd,
61 (off_t) 0)) == MAP_FAILED) {
62 LIBELF_SET_ERROR(IO, errno);
66 if ((e = elf_memory(m, (size_t) sb.st_size)) == NULL) {
67 (void) munmap(m, (size_t) sb.st_size);
71 e->e_flags |= LIBELF_F_MMAP;
75 if (c == ELF_C_RDWR && e->e_kind == ELF_K_AR) {
77 LIBELF_SET_ERROR(ARGUMENT, 0);
85 elf_begin(int fd, Elf_Cmd c, Elf *a)
91 if (LIBELF_PRIVATE(version) == EV_NONE) {
92 LIBELF_SET_ERROR(SEQUENCE, 0);
102 if (a != NULL) { /* not allowed for ar(1) archives. */
103 LIBELF_SET_ERROR(ARGUMENT, 0);
108 * Check writeability of `fd' immediately and fail if
111 if (ftruncate(fd, (off_t) 0) < 0) {
112 LIBELF_SET_ERROR(IO, errno);
116 if ((e = _libelf_allocate_elf()) != NULL) {
117 _libelf_init_elf(e, ELF_K_ELF);
118 e->e_byteorder = LIBELF_PRIVATE(byteorder);
125 if (a != NULL) { /* not allowed for ar(1) archives. */
126 LIBELF_SET_ERROR(ARGUMENT, 0);
132 * Descriptor `a' could be for a regular ELF file, or
133 * for an ar(1) archive.
135 if (a && (a->e_fd != fd || c != a->e_cmd)) {
136 LIBELF_SET_ERROR(ARGUMENT, 0);
143 LIBELF_SET_ERROR(ARGUMENT, 0);
149 e = _libelf_open_object(fd, c);
150 else if (a->e_kind == ELF_K_AR)
151 e = _libelf_ar_open_member(fd, c, a);
153 (e = a)->e_activations++;