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
31
32 int
main(int argc,char * argv[])33 main (int argc, char *argv[] __attribute__ ((unused)))
34 {
35 const char *fname = "xxx_update1";
36 int fd;
37 Elf *elf;
38 Elf32_Ehdr *ehdr;
39 int i;
40
41 fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666);
42 if (fd == -1)
43 {
44 printf ("cannot open `%s': %s\n", fname, strerror (errno));
45 exit (1);
46 }
47
48 elf_version (EV_CURRENT);
49
50 elf = elf_begin (fd, ELF_C_WRITE, NULL);
51 if (elf == NULL)
52 {
53 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
54 exit (1);
55 }
56
57 /* Create an ELF header. */
58 ehdr = elf32_newehdr (elf);
59 if (ehdr == NULL)
60 {
61 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
62 exit (1);
63 }
64
65 /* Print the ELF header values. */
66 if (argc > 1)
67 {
68 for (i = 0; i < EI_NIDENT; ++i)
69 printf (" %02x", ehdr->e_ident[i]);
70 printf ("\
71 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
72 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
73 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
74 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
75 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
76 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
77 ehdr->e_shnum, ehdr->e_shstrndx);
78 }
79
80 ehdr->e_ident[0] = 42;
81 ehdr->e_ident[4] = 1;
82 ehdr->e_ident[5] = 1;
83 ehdr->e_ident[6] = 2;
84 ehdr->e_ident[9] = 2;
85 ehdr->e_version = 1;
86 ehdr->e_ehsize = 1;
87
88 /* Write out the file. */
89 if (elf_update (elf, ELF_C_WRITE) < 0)
90 {
91 printf ("failure in elf_update: %s\n", elf_errmsg (-1));
92 exit (1);
93 }
94
95 /* Create an ELF header. */
96 ehdr = elf32_newehdr (elf);
97 if (ehdr == NULL)
98 {
99 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
100 exit (1);
101 }
102
103 /* Print the ELF header values. */
104 if (argc > 1)
105 {
106 for (i = 0; i < EI_NIDENT; ++i)
107 printf (" %02x", ehdr->e_ident[i]);
108 printf ("\
109 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
110 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
111 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
112 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
113 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
114 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
115 ehdr->e_shnum, ehdr->e_shstrndx);
116 }
117
118 if (elf_end (elf) != 0)
119 {
120 printf ("failure in elf_end: %s\n", elf_errmsg (-1));
121 exit (1);
122 }
123
124 unlink (fname);
125
126 return 0;
127 }
128