1 /* Test program for elf_update function.
2 Copyright (C) 2000, 2002, 2005 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 elfutils is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <libelf.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30 #include "system.h"
31
32
33 int
main(int argc,char * argv[])34 main (int argc, char *argv[] __attribute__ ((unused)))
35 {
36 const char *fname = "xxx_update1";
37 int fd;
38 Elf *elf;
39 Elf32_Ehdr *ehdr;
40 int i;
41
42 fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, DEFFILEMODE);
43 if (fd == -1)
44 {
45 printf ("cannot open `%s': %s\n", fname, strerror (errno));
46 exit (1);
47 }
48
49 elf_version (EV_CURRENT);
50
51 elf = elf_begin (fd, ELF_C_WRITE, NULL);
52 if (elf == NULL)
53 {
54 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
55 exit (1);
56 }
57
58 /* Create an ELF header. */
59 ehdr = elf32_newehdr (elf);
60 if (ehdr == NULL)
61 {
62 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
63 exit (1);
64 }
65
66 /* Print the ELF header values. */
67 if (argc > 1)
68 {
69 for (i = 0; i < EI_NIDENT; ++i)
70 printf (" %02x", ehdr->e_ident[i]);
71 printf ("\
72 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
73 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
74 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
75 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
76 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
77 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
78 ehdr->e_shnum, ehdr->e_shstrndx);
79 }
80
81 ehdr->e_ident[0] = 42;
82 ehdr->e_ident[4] = 1;
83 ehdr->e_ident[5] = 1;
84 ehdr->e_ident[6] = 2;
85 ehdr->e_ident[9] = 2;
86 ehdr->e_version = 1;
87 ehdr->e_ehsize = 1;
88
89 /* Write out the file. */
90 if (elf_update (elf, ELF_C_WRITE) < 0)
91 {
92 printf ("failure in elf_update: %s\n", elf_errmsg (-1));
93 exit (1);
94 }
95
96 /* Create an ELF header. */
97 ehdr = elf32_newehdr (elf);
98 if (ehdr == NULL)
99 {
100 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
101 exit (1);
102 }
103
104 /* Print the ELF header values. */
105 if (argc > 1)
106 {
107 for (i = 0; i < EI_NIDENT; ++i)
108 printf (" %02x", ehdr->e_ident[i]);
109 printf ("\
110 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
111 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
112 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
113 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
114 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
115 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
116 ehdr->e_shnum, ehdr->e_shstrndx);
117 }
118
119 if (elf_end (elf) != 0)
120 {
121 printf ("failure in elf_end: %s\n", elf_errmsg (-1));
122 exit (1);
123 }
124
125 unlink (fname);
126
127 return 0;
128 }
129