Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 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 |
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| 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. */ |
Ben Cheng | cd98178 | 2013-11-26 15:49:28 -0800 | [diff] [blame] | 65 | #ifdef __APPLE__ |
| 66 | static int global_error; |
| 67 | #else |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 68 | static __thread int global_error; |
Ben Cheng | cd98178 | 2013-11-26 15:49:28 -0800 | [diff] [blame] | 69 | #endif |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 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): |
Ben Cheng | 65b3819 | 2013-11-20 15:54:16 -0800 | [diff] [blame] | 170 | #ifdef __BIONIC__ |
| 171 | strerror_r (error & 0xffff, "bad", 0); |
| 172 | return "bad"; |
| 173 | #else |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 174 | return strerror_r (error & 0xffff, "bad", 0); |
Ben Cheng | 65b3819 | 2013-11-20 15:54:16 -0800 | [diff] [blame] | 175 | #endif |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 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) |