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
28 #include <sys/types.h>
29 #include <sys/errno.h>
40 _libelf_open_object(int fd
, Elf_Cmd c
)
47 * 'Raw' files are always mapped with 'PROT_READ'. At
48 * elf_update(3) time for files opened with ELF_C_RDWR the
49 * mapping is unmapped, file data is written to using write(2)
50 * and then the raw data is immediately mapped back in.
52 if (fstat(fd
, &sb
) < 0) {
53 LIBELF_SET_ERROR(IO
, errno
);
58 if ((m
= mmap(NULL
, (size_t) sb
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
,
59 (off_t
) 0)) == MAP_FAILED
) {
60 LIBELF_SET_ERROR(IO
, errno
);
64 if ((e
= elf_memory(m
, (size_t) sb
.st_size
)) == NULL
) {
65 (void) munmap(m
, (size_t) sb
.st_size
);
69 e
->e_flags
|= LIBELF_F_MMAP
;
73 if (c
== ELF_C_RDWR
&& e
->e_kind
== ELF_K_AR
) {
75 LIBELF_SET_ERROR(ARGUMENT
, 0);
83 elf_begin(int fd
, Elf_Cmd c
, Elf
*a
)
89 if (LIBELF_PRIVATE(version
) == EV_NONE
) {
90 LIBELF_SET_ERROR(SEQUENCE
, 0);
100 if (a
!= NULL
) { /* not allowed for ar(1) archives. */
101 LIBELF_SET_ERROR(ARGUMENT
, 0);
106 * Check writeability of `fd' immediately and fail if
109 if (ftruncate(fd
, (off_t
) 0) < 0) {
110 LIBELF_SET_ERROR(IO
, errno
);
114 if ((e
= _libelf_allocate_elf()) != NULL
) {
115 _libelf_init_elf(e
, ELF_K_ELF
);
116 e
->e_byteorder
= LIBELF_PRIVATE(byteorder
);
123 if (a
!= NULL
) { /* not allowed for ar(1) archives. */
124 LIBELF_SET_ERROR(ARGUMENT
, 0);
130 * Descriptor `a' could be for a regular ELF file, or
131 * for an ar(1) archive.
133 if (a
&& (a
->e_fd
!= fd
|| c
!= a
->e_cmd
)) {
134 LIBELF_SET_ERROR(ARGUMENT
, 0);
141 LIBELF_SET_ERROR(ARGUMENT
, 0);
147 e
= _libelf_open_object(fd
, c
);
148 else if (a
->e_kind
== ELF_K_AR
)
149 e
= _libelf_ar_open_member(fd
, c
, a
);
151 (e
= a
)->e_activations
++;