1 /* Error handling in libdwfl. 2 Copyright (C) 2005-2010 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 5 Red Hat elfutils is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by the 7 Free Software Foundation; version 2 of the License. 8 9 Red Hat elfutils is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License along 15 with Red Hat elfutils; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17 18 In addition, as a special exception, Red Hat, Inc. gives You the 19 additional right to link the code of Red Hat elfutils with code licensed 20 under any Open Source Initiative certified open source license 21 (http://www.opensource.org/licenses/index.php) which requires the 22 distribution of source code with any binary distribution and to 23 distribute linked combinations of the two. Non-GPL Code permitted under 24 this exception must only link to the code of Red Hat elfutils through 25 those well defined interfaces identified in the file named EXCEPTION 26 found in the source code files (the "Approved Interfaces"). The files 27 of Non-GPL Code may instantiate templates or use macros or inline 28 functions from the Approved Interfaces without causing the resulting 29 work to be covered by the GNU General Public License. Only Red Hat, 30 Inc. may make changes or additions to the list of Approved Interfaces. 31 Red Hat's grant of this exception is conditioned upon your not adding 32 any new exceptions. If you wish to add a new Approved Interface or 33 exception, please contact Red Hat. You must obey the GNU General Public 34 License in all respects for all of the Red Hat elfutils code and other 35 code used in conjunction with Red Hat elfutils except the Non-GPL Code 36 covered by this exception. If you modify this file, you may extend this 37 exception to your version of the file, but you are not obligated to do 38 so. If you do not wish to provide this exception without modification, 39 you must delete this exception statement from your version and license 40 this file solely under the GPL without exception. 41 42 Red Hat elfutils is an included package of the Open Invention Network. 43 An included package of the Open Invention Network is a package for which 44 Open Invention Network licensees cross-license their patents. No patent 45 license is granted, either expressly or impliedly, by designation as an 46 included package. Should you wish to participate in the Open Invention 47 Network licensing program, please visit www.openinventionnetwork.com 48 <http://www.openinventionnetwork.com>. */ 49 50 #ifdef HAVE_CONFIG_H 51 # include <config.h> 52 #endif 53 54 #include <assert.h> 55 #include <libintl.h> 56 #include <stdbool.h> 57 #include <stdint.h> 58 #include <stdlib.h> 59 #include <errno.h> 60 61 #include "libdwflP.h" 62 63 64 /* The error number. */ 65 #ifdef __APPLE__ 66 static int global_error; 67 #else 68 static __thread int global_error; 69 #endif 70 71 72 int 73 dwfl_errno (void) 74 { 75 int result = global_error; 76 global_error = DWFL_E_NOERROR; 77 return result; 78 } 79 INTDEF (dwfl_errno) 80 81 82 static const struct msgtable 83 { 84 #define DWFL_ERROR(name, text) char msg_##name[sizeof text]; 85 DWFL_ERRORS 86 #undef DWFL_ERROR 87 } msgtable = 88 { 89 #define DWFL_ERROR(name, text) text, 90 DWFL_ERRORS 91 #undef DWFL_ERROR 92 }; 93 #define msgstr (&msgtable.msg_NOERROR[0]) 94 95 static const uint_fast16_t msgidx[] = 96 { 97 #define DWFL_ERROR(name, text) \ 98 [DWFL_E_##name] = offsetof (struct msgtable, msg_##name), 99 DWFL_ERRORS 100 #undef DWFL_ERROR 101 }; 102 #define nmsgidx (sizeof msgidx / sizeof msgidx[0]) 103 104 105 static inline int 106 canonicalize (Dwfl_Error error) 107 { 108 unsigned int value; 109 110 switch (error) 111 { 112 default: 113 value = error; 114 if ((value &~ 0xffff) != 0) 115 break; 116 assert (value < nmsgidx); 117 break; 118 case DWFL_E_ERRNO: 119 value = DWFL_E (ERRNO, errno); 120 break; 121 case DWFL_E_LIBELF: 122 value = DWFL_E (LIBELF, elf_errno ()); 123 break; 124 case DWFL_E_LIBDW: 125 value = DWFL_E (LIBDW, INTUSE(dwarf_errno) ()); 126 break; 127 #if 0 128 DWFL_E_LIBEBL: 129 value = DWFL_E (LIBEBL, ebl_errno ()); 130 break; 131 #endif 132 } 133 134 return value; 135 } 136 137 int 138 internal_function 139 __libdwfl_canon_error (Dwfl_Error error) 140 { 141 return canonicalize (error); 142 } 143 144 void 145 internal_function 146 __libdwfl_seterrno (Dwfl_Error error) 147 { 148 global_error = canonicalize (error); 149 } 150 151 152 const char * 153 dwfl_errmsg (error) 154 int error; 155 { 156 if (error == 0 || error == -1) 157 { 158 int last_error = global_error; 159 160 if (error == 0 && last_error == 0) 161 return NULL; 162 163 error = last_error; 164 global_error = DWFL_E_NOERROR; 165 } 166 167 switch (error &~ 0xffff) 168 { 169 case OTHER_ERROR (ERRNO): 170 #ifdef __BIONIC__ 171 strerror_r (error & 0xffff, "bad", 0); 172 return "bad"; 173 #else 174 return strerror_r (error & 0xffff, "bad", 0); 175 #endif 176 case OTHER_ERROR (LIBELF): 177 return elf_errmsg (error & 0xffff); 178 case OTHER_ERROR (LIBDW): 179 return INTUSE(dwarf_errmsg) (error & 0xffff); 180 #if 0 181 case OTHER_ERROR (LIBEBL): 182 return ebl_errmsg (error & 0xffff); 183 #endif 184 } 185 186 return _(&msgstr[msgidx[(unsigned int) error < nmsgidx 187 ? error : DWFL_E_UNKNOWN_ERROR]]); 188 } 189 INTDEF (dwfl_errmsg) 190
