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[qemu/ar7.git] / qerror.c
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1 /*
2 * QError Module
4 * Copyright (C) 2009 Red Hat Inc.
6 * Authors:
7 * Luiz Capitulino <lcapitulino@redhat.com>
9 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
10 * See the COPYING.LIB file in the top-level directory.
13 #include "monitor.h"
14 #include "qjson.h"
15 #include "qerror.h"
16 #include "qemu-common.h"
18 static void qerror_destroy_obj(QObject *obj);
20 static const QType qerror_type = {
21 .code = QTYPE_QERROR,
22 .destroy = qerror_destroy_obj,
25 /**
26 * The 'desc' parameter is a printf-like string, the format of the format
27 * string is:
29 * %(KEY)
31 * Where KEY is a QDict key, which has to be passed to qerror_from_info().
33 * Example:
35 * "foo error on device: %(device) slot: %(slot_nr)"
37 * A single percent sign can be printed if followed by a second one,
38 * for example:
40 * "running out of foo: %(foo)%%"
42 * Please keep the entries in alphabetical order.
43 * Use "sed -n '/^static.*qerror_table\[\]/,/^};/s/QERR_/&/gp' qerror.c | sort -c"
44 * to check.
46 static const QErrorStringTable qerror_table[] = {
48 .error_fmt = QERR_BAD_BUS_FOR_DEVICE,
49 .desc = "Device '%(device)' can't go on a %(bad_bus_type) bus",
52 .error_fmt = QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
53 .desc = "Block format '%(format)' used by device '%(name)' does not support feature '%(feature)'",
56 .error_fmt = QERR_BUS_NOT_FOUND,
57 .desc = "Bus '%(bus)' not found",
60 .error_fmt = QERR_BUS_NO_HOTPLUG,
61 .desc = "Bus '%(bus)' does not support hotplugging",
64 .error_fmt = QERR_COMMAND_NOT_FOUND,
65 .desc = "The command %(name) has not been found",
68 .error_fmt = QERR_DEVICE_ENCRYPTED,
69 .desc = "Device '%(device)' is encrypted",
72 .error_fmt = QERR_DEVICE_INIT_FAILED,
73 .desc = "Device '%(device)' could not be initialized",
76 .error_fmt = QERR_DEVICE_IN_USE,
77 .desc = "Device '%(device)' is in use",
80 .error_fmt = QERR_DEVICE_FEATURE_BLOCKS_MIGRATION,
81 .desc = "Migration is disabled when using feature '%(feature)' in device '%(device)'",
84 .error_fmt = QERR_DEVICE_LOCKED,
85 .desc = "Device '%(device)' is locked",
88 .error_fmt = QERR_DEVICE_MULTIPLE_BUSSES,
89 .desc = "Device '%(device)' has multiple child busses",
92 .error_fmt = QERR_DEVICE_NOT_ACTIVE,
93 .desc = "Device '%(device)' has not been activated",
96 .error_fmt = QERR_DEVICE_NOT_ENCRYPTED,
97 .desc = "Device '%(device)' is not encrypted",
100 .error_fmt = QERR_DEVICE_NOT_FOUND,
101 .desc = "Device '%(device)' not found",
104 .error_fmt = QERR_DEVICE_NOT_REMOVABLE,
105 .desc = "Device '%(device)' is not removable",
108 .error_fmt = QERR_DEVICE_NO_BUS,
109 .desc = "Device '%(device)' has no child bus",
112 .error_fmt = QERR_DEVICE_NO_HOTPLUG,
113 .desc = "Device '%(device)' does not support hotplugging",
116 .error_fmt = QERR_DUPLICATE_ID,
117 .desc = "Duplicate ID '%(id)' for %(object)",
120 .error_fmt = QERR_FD_NOT_FOUND,
121 .desc = "File descriptor named '%(name)' not found",
124 .error_fmt = QERR_FD_NOT_SUPPLIED,
125 .desc = "No file descriptor supplied via SCM_RIGHTS",
128 .error_fmt = QERR_FEATURE_DISABLED,
129 .desc = "The feature '%(name)' is not enabled",
132 .error_fmt = QERR_INVALID_BLOCK_FORMAT,
133 .desc = "Invalid block format '%(name)'",
136 .error_fmt = QERR_INVALID_PARAMETER,
137 .desc = "Invalid parameter '%(name)'",
140 .error_fmt = QERR_INVALID_PARAMETER_TYPE,
141 .desc = "Invalid parameter type, expected: %(expected)",
144 .error_fmt = QERR_INVALID_PARAMETER_VALUE,
145 .desc = "Parameter '%(name)' expects %(expected)",
148 .error_fmt = QERR_INVALID_PASSWORD,
149 .desc = "Password incorrect",
152 .error_fmt = QERR_JSON_PARSING,
153 .desc = "Invalid JSON syntax",
156 .error_fmt = QERR_JSON_PARSE_ERROR,
157 .desc = "JSON parse error, %(message)",
161 .error_fmt = QERR_KVM_MISSING_CAP,
162 .desc = "Using KVM without %(capability), %(feature) unavailable",
165 .error_fmt = QERR_MIGRATION_EXPECTED,
166 .desc = "An incoming migration is expected before this command can be executed",
169 .error_fmt = QERR_MISSING_PARAMETER,
170 .desc = "Parameter '%(name)' is missing",
173 .error_fmt = QERR_NO_BUS_FOR_DEVICE,
174 .desc = "No '%(bus)' bus found for device '%(device)'",
177 .error_fmt = QERR_OPEN_FILE_FAILED,
178 .desc = "Could not open '%(filename)'",
181 .error_fmt = QERR_PROPERTY_NOT_FOUND,
182 .desc = "Property '%(device).%(property)' not found",
185 .error_fmt = QERR_PROPERTY_VALUE_BAD,
186 .desc = "Property '%(device).%(property)' doesn't take value '%(value)'",
189 .error_fmt = QERR_PROPERTY_VALUE_IN_USE,
190 .desc = "Property '%(device).%(property)' can't take value '%(value)', it's in use",
193 .error_fmt = QERR_PROPERTY_VALUE_NOT_FOUND,
194 .desc = "Property '%(device).%(property)' can't find value '%(value)'",
197 .error_fmt = QERR_QMP_BAD_INPUT_OBJECT,
198 .desc = "Expected '%(expected)' in QMP input",
201 .error_fmt = QERR_QMP_BAD_INPUT_OBJECT_MEMBER,
202 .desc = "QMP input object member '%(member)' expects '%(expected)'",
205 .error_fmt = QERR_QMP_EXTRA_MEMBER,
206 .desc = "QMP input object member '%(member)' is unexpected",
209 .error_fmt = QERR_RESET_REQUIRED,
210 .desc = "Resetting the Virtual Machine is required",
213 .error_fmt = QERR_SET_PASSWD_FAILED,
214 .desc = "Could not set password",
217 .error_fmt = QERR_ADD_CLIENT_FAILED,
218 .desc = "Could not add client",
221 .error_fmt = QERR_TOO_MANY_FILES,
222 .desc = "Too many open files",
225 .error_fmt = QERR_UNDEFINED_ERROR,
226 .desc = "An undefined error has occurred",
229 .error_fmt = QERR_UNSUPPORTED,
230 .desc = "this feature or command is not currently supported",
233 .error_fmt = QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
234 .desc = "'%(device)' uses a %(format) feature which is not "
235 "supported by this qemu version: %(feature)",
238 .error_fmt = QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION,
239 .desc = "Migration is disabled when VirtFS export path '%(path)' "
240 "is mounted in the guest using mount_tag '%(tag)'",
243 .error_fmt = QERR_VNC_SERVER_FAILED,
244 .desc = "Could not start VNC server on %(target)",
247 .error_fmt = QERR_QGA_LOGGING_FAILED,
248 .desc = "Guest agent failed to log non-optional log statement",
251 .error_fmt = QERR_QGA_COMMAND_FAILED,
252 .desc = "Guest agent command failed, error was '%(message)'",
255 .error_fmt = QERR_INVALID_PARAMETER_COMBINATION,
256 .desc = "Invalid paramter combination",
262 * qerror_new(): Create a new QError
264 * Return strong reference.
266 QError *qerror_new(void)
268 QError *qerr;
270 qerr = g_malloc0(sizeof(*qerr));
271 QOBJECT_INIT(qerr, &qerror_type);
273 return qerr;
276 static void GCC_FMT_ATTR(2, 3) qerror_abort(const QError *qerr,
277 const char *fmt, ...)
279 va_list ap;
281 fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func);
282 fprintf(stderr, "qerror: -> ");
284 va_start(ap, fmt);
285 vfprintf(stderr, fmt, ap);
286 va_end(ap);
288 fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr);
289 abort();
292 static void GCC_FMT_ATTR(2, 0) qerror_set_data(QError *qerr,
293 const char *fmt, va_list *va)
295 QObject *obj;
297 obj = qobject_from_jsonv(fmt, va);
298 if (!obj) {
299 qerror_abort(qerr, "invalid format '%s'", fmt);
301 if (qobject_type(obj) != QTYPE_QDICT) {
302 qerror_abort(qerr, "error format is not a QDict '%s'", fmt);
305 qerr->error = qobject_to_qdict(obj);
307 obj = qdict_get(qerr->error, "class");
308 if (!obj) {
309 qerror_abort(qerr, "missing 'class' key in '%s'", fmt);
311 if (qobject_type(obj) != QTYPE_QSTRING) {
312 qerror_abort(qerr, "'class' key value should be a QString");
315 obj = qdict_get(qerr->error, "data");
316 if (!obj) {
317 qerror_abort(qerr, "missing 'data' key in '%s'", fmt);
319 if (qobject_type(obj) != QTYPE_QDICT) {
320 qerror_abort(qerr, "'data' key value should be a QDICT");
324 static void qerror_set_desc(QError *qerr, const char *fmt)
326 int i;
328 // FIXME: inefficient loop
330 for (i = 0; qerror_table[i].error_fmt; i++) {
331 if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
332 qerr->entry = &qerror_table[i];
333 return;
337 qerror_abort(qerr, "error format '%s' not found", fmt);
341 * qerror_from_info(): Create a new QError from error information
343 * The information consists of:
345 * - file the file name of where the error occurred
346 * - linenr the line number of where the error occurred
347 * - func the function name of where the error occurred
348 * - fmt JSON printf-like dictionary, there must exist keys 'class' and
349 * 'data'
350 * - va va_list of all arguments specified by fmt
352 * Return strong reference.
354 QError *qerror_from_info(const char *file, int linenr, const char *func,
355 const char *fmt, va_list *va)
357 QError *qerr;
359 qerr = qerror_new();
360 loc_save(&qerr->loc);
361 qerr->linenr = linenr;
362 qerr->file = file;
363 qerr->func = func;
365 if (!fmt) {
366 qerror_abort(qerr, "QDict not specified");
369 qerror_set_data(qerr, fmt, va);
370 qerror_set_desc(qerr, fmt);
372 return qerr;
375 static void parse_error(const QErrorStringTable *entry, int c)
377 fprintf(stderr, "expected '%c' in '%s'", c, entry->desc);
378 abort();
381 static const char *append_field(QDict *error, QString *outstr,
382 const QErrorStringTable *entry,
383 const char *start)
385 QObject *obj;
386 QDict *qdict;
387 QString *key_qs;
388 const char *end, *key;
390 if (*start != '%')
391 parse_error(entry, '%');
392 start++;
393 if (*start != '(')
394 parse_error(entry, '(');
395 start++;
397 end = strchr(start, ')');
398 if (!end)
399 parse_error(entry, ')');
401 key_qs = qstring_from_substr(start, 0, end - start - 1);
402 key = qstring_get_str(key_qs);
404 qdict = qobject_to_qdict(qdict_get(error, "data"));
405 obj = qdict_get(qdict, key);
406 if (!obj) {
407 abort();
410 switch (qobject_type(obj)) {
411 case QTYPE_QSTRING:
412 qstring_append(outstr, qdict_get_str(qdict, key));
413 break;
414 case QTYPE_QINT:
415 qstring_append_int(outstr, qdict_get_int(qdict, key));
416 break;
417 default:
418 abort();
421 QDECREF(key_qs);
422 return ++end;
425 static QString *qerror_format_desc(QDict *error,
426 const QErrorStringTable *entry)
428 QString *qstring;
429 const char *p;
431 assert(entry != NULL);
433 qstring = qstring_new();
435 for (p = entry->desc; *p != '\0';) {
436 if (*p != '%') {
437 qstring_append_chr(qstring, *p++);
438 } else if (*(p + 1) == '%') {
439 qstring_append_chr(qstring, '%');
440 p += 2;
441 } else {
442 p = append_field(error, qstring, entry, p);
446 return qstring;
449 QString *qerror_format(const char *fmt, QDict *error)
451 const QErrorStringTable *entry = NULL;
452 int i;
454 for (i = 0; qerror_table[i].error_fmt; i++) {
455 if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
456 entry = &qerror_table[i];
457 break;
461 return qerror_format_desc(error, entry);
465 * qerror_human(): Format QError data into human-readable string.
467 QString *qerror_human(const QError *qerror)
469 return qerror_format_desc(qerror->error, qerror->entry);
473 * qerror_print(): Print QError data
475 * This function will print the member 'desc' of the specified QError object,
476 * it uses error_report() for this, so that the output is routed to the right
477 * place (ie. stderr or Monitor's device).
479 void qerror_print(QError *qerror)
481 QString *qstring = qerror_human(qerror);
482 loc_push_restore(&qerror->loc);
483 error_report("%s", qstring_get_str(qstring));
484 loc_pop(&qerror->loc);
485 QDECREF(qstring);
488 void qerror_report_internal(const char *file, int linenr, const char *func,
489 const char *fmt, ...)
491 va_list va;
492 QError *qerror;
494 va_start(va, fmt);
495 qerror = qerror_from_info(file, linenr, func, fmt, &va);
496 va_end(va);
498 if (monitor_cur_is_qmp()) {
499 monitor_set_error(cur_mon, qerror);
500 } else {
501 qerror_print(qerror);
502 QDECREF(qerror);
506 /* Evil... */
507 struct Error
509 QDict *obj;
510 const char *fmt;
511 char *msg;
514 void qerror_report_err(Error *err)
516 QError *qerr;
517 int i;
519 qerr = qerror_new();
520 loc_save(&qerr->loc);
521 QINCREF(err->obj);
522 qerr->error = err->obj;
524 for (i = 0; qerror_table[i].error_fmt; i++) {
525 if (strcmp(qerror_table[i].error_fmt, err->fmt) == 0) {
526 qerr->entry = &qerror_table[i];
527 break;
531 if (monitor_cur_is_qmp()) {
532 monitor_set_error(cur_mon, qerr);
533 } else {
534 qerror_print(qerr);
535 QDECREF(qerr);
540 * qobject_to_qerror(): Convert a QObject into a QError
542 QError *qobject_to_qerror(const QObject *obj)
544 if (qobject_type(obj) != QTYPE_QERROR) {
545 return NULL;
548 return container_of(obj, QError, base);
552 * qerror_destroy_obj(): Free all memory allocated by a QError
554 static void qerror_destroy_obj(QObject *obj)
556 QError *qerr;
558 assert(obj != NULL);
559 qerr = qobject_to_qerror(obj);
561 QDECREF(qerr->error);
562 g_free(qerr);