1 /* Copyright (C) 2011 Red Hat, Inc. 2 This file is part of elfutils. 3 Written by Marek Polacek <mpolacek (at) redhat.com>, 2011. 4 5 This file is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #ifdef HAVE_CONFIG_H 19 # include <config.h> 20 #endif 21 22 #include ELFUTILS_HEADER(dwfl) 23 #include <assert.h> 24 #include <dwarf.h> 25 #include <fcntl.h> 26 #include <stdio.h> 27 #include <unistd.h> 28 29 30 int 31 main (int argc, char *argv[]) 32 { 33 int cnt; 34 35 for (cnt = 1; cnt < argc; ++cnt) 36 { 37 Dwarf_Off offset = 0; 38 size_t len; 39 40 int fd = open (argv[cnt], O_RDONLY); 41 if (fd == -1) 42 { 43 printf ("cannot open '%s': %m\n", argv[cnt]); 44 return 1; 45 } 46 47 Dwarf *dbg = dwarf_begin (fd, DWARF_C_READ); 48 if (dbg == NULL) 49 { 50 printf ("%s not usable: %s\n", argv[cnt], dwarf_errmsg (-1)); 51 close (fd); 52 return 1; 53 } 54 55 /* Try to use NULL Dwarf object. */ 56 const char *str = dwarf_getstring (NULL, offset, &len); 57 assert (str == NULL); 58 59 /* Use insane offset. */ 60 str = dwarf_getstring (dbg, ~0UL, &len); 61 assert (str == NULL); 62 63 /* Now do some real work. */ 64 for (int i = 0; i < 100; ++i) 65 { 66 str = dwarf_getstring (dbg, offset, &len); 67 puts (str); 68 69 /* Advance. */ 70 offset += len + 1; 71 } 72 73 dwarf_end (dbg); 74 close (fd); 75 } 76 77 return 0; 78 } 79
