balloon: Don't balloon roms
[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 (*errp)->msg = g_string_free(newmsg, 0);
138 }
139
140 void error_prepend(Error **errp, const char *fmt, ...)
141 {
142 va_list ap;
143
144 va_start(ap, fmt);
145 error_vprepend(errp, fmt, ap);
146 va_end(ap);
147 }
148
149 void error_append_hint(Error **errp, const char *fmt, ...)
150 {
151 va_list ap;
152 int saved_errno = errno;
153 Error *err;
154
155 if (!errp) {
156 return;
157 }
158 err = *errp;
159 assert(err && errp != &error_abort && errp != &error_fatal);
160
161 if (!err->hint) {
162 err->hint = g_string_new(NULL);
163 }
164 va_start(ap, fmt);
165 g_string_append_vprintf(err->hint, fmt, ap);
166 va_end(ap);
167
168 errno = saved_errno;
169 }
170
171 #ifdef _WIN32
172
173 void error_setg_win32_internal(Error **errp,
174 const char *src, int line, const char *func,
175 int win32_err, const char *fmt, ...)
176 {
177 va_list ap;
178 char *suffix = NULL;
179
180 if (errp == NULL) {
181 return;
182 }
183
184 if (win32_err != 0) {
185 suffix = g_win32_error_message(win32_err);
186 }
187
188 va_start(ap, fmt);
189 error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR,
190 fmt, ap, suffix);
191 va_end(ap);
192
193 g_free(suffix);
194 }
195
196 #endif
197
198 Error *error_copy(const Error *err)
199 {
200 Error *err_new;
201
202 err_new = g_malloc0(sizeof(*err));
203 err_new->msg = g_strdup(err->msg);
204 err_new->err_class = err->err_class;
205 err_new->src = err->src;
206 err_new->line = err->line;
207 err_new->func = err->func;
208 if (err->hint) {
209 err_new->hint = g_string_new(err->hint->str);
210 }
211
212 return err_new;
213 }
214
215 ErrorClass error_get_class(const Error *err)
216 {
217 return err->err_class;
218 }
219
220 const char *error_get_pretty(const Error *err)
221 {
222 return err->msg;
223 }
224
225 void error_report_err(Error *err)
226 {
227 error_report("%s", error_get_pretty(err));
228 if (err->hint) {
229 error_printf_unless_qmp("%s", err->hint->str);
230 }
231 error_free(err);
232 }
233
234 void error_reportf_err(Error *err, const char *fmt, ...)
235 {
236 va_list ap;
237
238 va_start(ap, fmt);
239 error_vprepend(&err, fmt, ap);
240 va_end(ap);
241 error_report_err(err);
242 }
243
244 void error_free(Error *err)
245 {
246 if (err) {
247 g_free(err->msg);
248 if (err->hint) {
249 g_string_free(err->hint, true);
250 }
251 g_free(err);
252 }
253 }
254
255 void error_free_or_abort(Error **errp)
256 {
257 assert(errp && *errp);
258 error_free(*errp);
259 *errp = NULL;
260 }
261
262 void error_propagate(Error **dst_errp, Error *local_err)
263 {
264 if (!local_err) {
265 return;
266 }
267 error_handle_fatal(dst_errp, local_err);
268 if (dst_errp && !*dst_errp) {
269 *dst_errp = local_err;
270 } else {
271 error_free(local_err);
272 }
273 }