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>
43 _libelf_open_object(int fd, Elf_Cmd c)
50 * 'Raw' files are always mapped with 'PROT_READ'. At
51 * elf_update(3) time for files opened with ELF_C_RDWR the
52 * mapping is unmapped, file data is written to using write(2)
53 * and then the raw data is immediately mapped back in.
55 if (fstat(fd, &sb) < 0) {
56 LIBELF_SET_ERROR(IO, errno);
61 if ((m = mmap(NULL, (size_t) sb.st_size, PROT_READ, MAP_PRIVATE, fd,
62 (off_t) 0)) == MAP_FAILED) {
63 LIBELF_SET_ERROR(IO, errno);
67 if ((e = elf_memory(m, (size_t) sb.st_size)) == NULL) {
68 (void) munmap(m, (size_t) sb.st_size);
72 e->e_flags |= LIBELF_F_MMAP;
76 if (c == ELF_C_RDWR && e->e_kind == ELF_K_AR) {
78 LIBELF_SET_ERROR(ARGUMENT, 0);
86 elf_begin(int fd, Elf_Cmd c, Elf *a)
92 if (LIBELF_PRIVATE(version) == EV_NONE) {
93 LIBELF_SET_ERROR(SEQUENCE, 0);
103 if (a != NULL) { /* not allowed for ar(1) archives. */
104 LIBELF_SET_ERROR(ARGUMENT, 0);
109 * Check writeability of `fd' immediately and fail if
112 if (ftruncate(fd, (off_t) 0) < 0) {
113 LIBELF_SET_ERROR(IO, errno);
117 if ((e = _libelf_allocate_elf()) != NULL) {
118 _libelf_init_elf(e, ELF_K_ELF);
119 e->e_byteorder = LIBELF_PRIVATE(byteorder);
126 if (a != NULL) { /* not allowed for ar(1) archives. */
127 LIBELF_SET_ERROR(ARGUMENT, 0);
133 * Descriptor `a' could be for a regular ELF file, or
134 * for an ar(1) archive. If descriptor `a' was opened
135 * using a valid file descriptor, we need to check if
136 * the passed in `fd' value matches the original one.
139 ((a->e_fd != -1 && a->e_fd != fd) || c != a->e_cmd)) {
140 LIBELF_SET_ERROR(ARGUMENT, 0);
146 LIBELF_SET_ERROR(ARGUMENT, 0);
152 e = _libelf_open_object(fd, c);
153 else if (a->e_kind == ELF_K_AR)
154 e = _libelf_ar_open_member(a->e_fd, c, a);
156 (e = a)->e_activations++;