ppc/pnv: Add support for POWER8+ LPC Controller
[qemu.git] / util / error.c
1 /*
2 * QEMU Error Objects
3 *
4 * Copyright IBM, Corp. 2011
5 * Copyright (C) 2011-2015 Red Hat, Inc.
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Markus Armbruster <armbru@redhat.com>,
10 *
11 * This work is licensed under the terms of the GNU LGPL, version 2. See
12 * the COPYING.LIB file in the top-level directory.
13 */
14
15 #include "qemu/osdep.h"
16 #include "qapi/error.h"
17 #include "qemu-common.h"
18 #include "qemu/error-report.h"
19
20 struct Error
21 {
22 char *msg;
23 ErrorClass err_class;
24 const char *src, *func;
25 int line;
26 GString *hint;
27 };
28
29 Error *error_abort;
30 Error *error_fatal;
31
32 static void error_handle_fatal(Error **errp, Error *err)
33 {
34 if (errp == &error_abort) {
35 fprintf(stderr, "Unexpected error in %s() at %s:%d:\n",
36 err->func, err->src, err->line);
37 error_report_err(err);
38 abort();
39 }
40 if (errp == &error_fatal) {
41 error_report_err(err);
42 exit(1);
43 }
44 }
45
46 static void error_setv(Error **errp,
47 const char *src, int line, const char *func,
48 ErrorClass err_class, const char *fmt, va_list ap,
49 const char *suffix)
50 {
51 Error *err;
52 int saved_errno = errno;
53
54 if (errp == NULL) {
55 return;
56 }
57 assert(*errp == NULL);
58
59 err = g_malloc0(sizeof(*err));
60 err->msg = g_strdup_vprintf(fmt, ap);
61 if (suffix) {
62 char *msg = err->msg;
63 err->msg = g_strdup_printf("%s: %s", msg, suffix);
64 g_free(msg);
65 }
66 err->err_class = err_class;
67 err->src = src;
68 err->line = line;
69 err->func = func;
70
71 error_handle_fatal(errp, err);
72 *errp = err;
73
74 errno = saved_errno;
75 }
76
77 void error_set_internal(Error **errp,
78 const char *src, int line, const char *func,
79 ErrorClass err_class, const char *fmt, ...)
80 {
81 va_list ap;
82
83 va_start(ap, fmt);
84 error_setv(errp, src, line, func, err_class, fmt, ap, NULL);
85 va_end(ap);
86 }
87
88 void error_setg_internal(Error **errp,
89 const char *src, int line, const char *func,
90 const char *fmt, ...)
91 {
92 va_list ap;
93
94 va_start(ap, fmt);
95 error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap, NULL);
96 va_end(ap);
97 }
98
99 void error_setg_errno_internal(Error **errp,
100 const char *src, int line, const char *func,
101 int os_errno, const char *fmt, ...)
102 {
103 va_list ap;
104 int saved_errno = errno;
105
106 if (errp == NULL) {
107 return;
108 }
109
110 va_start(ap, fmt);
111 error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap,
112 os_errno != 0 ? strerror(os_errno) : NULL);
113 va_end(ap);
114
115 errno = saved_errno;
116 }
117
118 void error_setg_file_open_internal(Error **errp,
119 const char *src, int line, const char *func,
120 int os_errno, const char *filename)
121 {
122 error_setg_errno_internal(errp, src, line, func, os_errno,
123 "Could not open '%s'", filename);
124 }
125
126 void error_vprepend(Error **errp, const char *fmt, va_list ap)
127 {
128 GString *newmsg;
129
130 if (!errp) {
131 return;
132 }
133
134 newmsg = g_string_new(NULL);
135 g_string_vprintf(newmsg, fmt, ap);
136 g_string_append(newmsg, (*errp)->msg);
137 g_free((*errp)->msg);
138 (*errp)->msg = g_string_free(newmsg, 0);
139 }
140
141 void error_prepend(Error **errp, const char *fmt, ...)
142 {
143 va_list ap;
144
145 va_start(ap, fmt);
146 error_vprepend(errp, fmt, ap);
147 va_end(ap);
148 }
149
150 void error_append_hint(Error **errp, const char *fmt, ...)
151 {
152 va_list ap;
153 int saved_errno = errno;
154 Error *err;
155
156 if (!errp) {
157 return;
158 }
159 err = *errp;
160 assert(err && errp != &error_abort && errp != &error_fatal);
161
162 if (!err->hint) {
163 err->hint = g_string_new(NULL);
164 }
165 va_start(ap, fmt);
166 g_string_append_vprintf(err->hint, fmt, ap);
167 va_end(ap);
168
169 errno = saved_errno;
170 }
171
172 #ifdef _WIN32
173
174 void error_setg_win32_internal(Error **errp,
175 const char *src, int line, const char *func,
176 int win32_err, const char *fmt, ...)
177 {
178 va_list ap;
179 char *suffix = NULL;
180
181 if (errp == NULL) {
182 return;
183 }
184
185 if (win32_err != 0) {
186 suffix = g_win32_error_message(win32_err);
187 }
188
189 va_start(ap, fmt);
190 error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR,
191 fmt, ap, suffix);
192 va_end(ap);
193
194 g_free(suffix);
195 }
196
197 #endif
198
199 Error *error_copy(const Error *err)
200 {
201 Error *err_new;
202
203 err_new = g_malloc0(sizeof(*err));
204 err_new->msg = g_strdup(err->msg);
205 err_new->err_class = err->err_class;
206 err_new->src = err->src;
207 err_new->line = err->line;
208 err_new->func = err->func;
209 if (err->hint) {
210 err_new->hint = g_string_new(err->hint->str);
211 }
212
213 return err_new;
214 }
215
216 ErrorClass error_get_class(const Error *err)
217 {
218 return err->err_class;
219 }
220
221 const char *error_get_pretty(const Error *err)
222 {
223 return err->msg;
224 }
225
226 void error_report_err(Error *err)
227 {
228 error_report("%s", error_get_pretty(err));
229 if (err->hint) {
230 error_printf_unless_qmp("%s", err->hint->str);
231 }
232 error_free(err);
233 }
234
235 void error_reportf_err(Error *err, const char *fmt, ...)
236 {
237 va_list ap;
238
239 va_start(ap, fmt);
240 error_vprepend(&err, fmt, ap);
241 va_end(ap);
242 error_report_err(err);
243 }
244
245 void error_free(Error *err)
246 {
247 if (err) {
248 g_free(err->msg);
249 if (err->hint) {
250 g_string_free(err->hint, true);
251 }
252 g_free(err);
253 }
254 }
255
256 void error_free_or_abort(Error **errp)
257 {
258 assert(errp && *errp);
259 error_free(*errp);
260 *errp = NULL;
261 }
262
263 void error_propagate(Error **dst_errp, Error *local_err)
264 {
265 if (!local_err) {
266 return;
267 }
268 error_handle_fatal(dst_errp, local_err);
269 if (dst_errp && !*dst_errp) {
270 *dst_errp = local_err;
271 } else {
272 error_free(local_err);
273 }
274 }