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
dwfl_errno(void)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
canonicalize(Dwfl_Error error)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
__libdwfl_canon_error(Dwfl_Error error)139 __libdwfl_canon_error (Dwfl_Error error)
140 {
141 return canonicalize (error);
142 }
143
144 void
145 internal_function
__libdwfl_seterrno(Dwfl_Error error)146 __libdwfl_seterrno (Dwfl_Error error)
147 {
148 global_error = canonicalize (error);
149 }
150
151
152 const char *
dwfl_errmsg(error)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