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
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