1 /* Test program for elf_update function.
2 Copyright (C) 2000, 2002 Red Hat, Inc.
3 Written by Ulrich Drepper <drepper@redhat.com>, 2000.
4
5 This program is Open Source software; you can redistribute it and/or
6 modify it under the terms of the Open Software License version 1.0 as
7 published by the Open Source Initiative.
8
9 You should have received a copy of the Open Software License along
10 with this program; if not, you may obtain a copy of the Open Software
11 License version 1.0 from http://www.opensource.org/licenses/osl.php or
12 by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
13 3001 King Ranch Road, Ukiah, CA 95482. */
14
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
18
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <libelf.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25
26
27 int
main(int argc,char * argv[])28 main (int argc, char *argv[])
29 {
30 const char *fname = "xxx";
31 int fd;
32 Elf *elf;
33 Elf32_Ehdr *ehdr;
34 int i;
35
36 fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666);
37 if (fd == -1)
38 {
39 printf ("cannot open `%s': %s\n", fname, strerror (errno));
40 exit (1);
41 }
42
43 elf_version (EV_CURRENT);
44
45 elf = elf_begin (fd, ELF_C_WRITE, NULL);
46 if (elf == NULL)
47 {
48 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
49 exit (1);
50 }
51
52 /* Create an ELF header. */
53 ehdr = elf32_newehdr (elf);
54 if (ehdr == NULL)
55 {
56 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
57 exit (1);
58 }
59
60 /* Print the ELF header values. */
61 if (argc > 1)
62 {
63 for (i = 0; i < EI_NIDENT; ++i)
64 printf (" %02x", ehdr->e_ident[i]);
65 printf ("\
66 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
67 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
68 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
69 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
70 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
71 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
72 ehdr->e_shnum, ehdr->e_shstrndx);
73 }
74
75 ehdr->e_ident[0] = 42;
76 ehdr->e_ident[4] = 1;
77 ehdr->e_ident[5] = 1;
78 ehdr->e_ident[6] = 2;
79 ehdr->e_ident[9] = 2;
80 ehdr->e_version = 1;
81 ehdr->e_ehsize = 1;
82
83 /* Write out the file. */
84 if (elf_update (elf, ELF_C_WRITE) < 0)
85 {
86 printf ("failure in elf_update: %s\n", elf_errmsg (-1));
87 exit (1);
88 }
89
90 /* Create an ELF header. */
91 ehdr = elf32_newehdr (elf);
92 if (ehdr == NULL)
93 {
94 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
95 exit (1);
96 }
97
98 /* Print the ELF header values. */
99 if (argc > 1)
100 {
101 for (i = 0; i < EI_NIDENT; ++i)
102 printf (" %02x", ehdr->e_ident[i]);
103 printf ("\
104 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
105 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
106 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
107 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
108 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
109 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
110 ehdr->e_shnum, ehdr->e_shstrndx);
111 }
112
113 if (elf_end (elf) != 0)
114 {
115 printf ("failure in elf_end: %s\n", elf_errmsg (-1));
116 exit (1);
117 }
118
119 return 0;
120 }
121