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 (at) 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
