xref: /openbmc/qemu/util/error-report.c (revision 05caa062)
1 /*
2  * Error reporting
3  *
4  * Copyright (C) 2010 Red Hat Inc.
5  *
6  * Authors:
7  *  Markus Armbruster <armbru@redhat.com>,
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
10  * See the COPYING file in the top-level directory.
11  */
12 
13 #include "qemu/osdep.h"
14 #include "monitor/monitor.h"
15 #include "qemu/error-report.h"
16 
17 /*
18  * @report_type is the type of message: error, warning or
19  * informational.
20  */
21 typedef enum {
22     REPORT_TYPE_ERROR,
23     REPORT_TYPE_WARNING,
24     REPORT_TYPE_INFO,
25 } report_type;
26 
27 /* Prepend timestamp to messages */
28 bool message_with_timestamp;
29 bool error_with_guestname;
30 const char *error_guest_name;
31 
32 int error_printf(const char *fmt, ...)
33 {
34     va_list ap;
35     int ret;
36 
37     va_start(ap, fmt);
38     ret = error_vprintf(fmt, ap);
39     va_end(ap);
40     return ret;
41 }
42 
43 static Location std_loc = {
44     .kind = LOC_NONE
45 };
46 static Location *cur_loc = &std_loc;
47 
48 /*
49  * Push location saved in LOC onto the location stack, return it.
50  * The top of that stack is the current location.
51  * Needs a matching loc_pop().
52  */
53 Location *loc_push_restore(Location *loc)
54 {
55     assert(!loc->prev);
56     loc->prev = cur_loc;
57     cur_loc = loc;
58     return loc;
59 }
60 
61 /*
62  * Initialize *LOC to "nowhere", push it onto the location stack.
63  * The top of that stack is the current location.
64  * Needs a matching loc_pop().
65  * Return LOC.
66  */
67 Location *loc_push_none(Location *loc)
68 {
69     loc->kind = LOC_NONE;
70     loc->prev = NULL;
71     return loc_push_restore(loc);
72 }
73 
74 /*
75  * Pop the location stack.
76  * LOC must be the current location, i.e. the top of the stack.
77  */
78 Location *loc_pop(Location *loc)
79 {
80     assert(cur_loc == loc && loc->prev);
81     cur_loc = loc->prev;
82     loc->prev = NULL;
83     return loc;
84 }
85 
86 /*
87  * Save the current location in LOC, return LOC.
88  */
89 Location *loc_save(Location *loc)
90 {
91     *loc = *cur_loc;
92     loc->prev = NULL;
93     return loc;
94 }
95 
96 /*
97  * Change the current location to the one saved in LOC.
98  */
99 void loc_restore(Location *loc)
100 {
101     Location *prev = cur_loc->prev;
102     assert(!loc->prev);
103     *cur_loc = *loc;
104     cur_loc->prev = prev;
105 }
106 
107 /*
108  * Change the current location to "nowhere in particular".
109  */
110 void loc_set_none(void)
111 {
112     cur_loc->kind = LOC_NONE;
113 }
114 
115 /*
116  * Change the current location to argument ARGV[IDX..IDX+CNT-1].
117  */
118 void loc_set_cmdline(char **argv, int idx, int cnt)
119 {
120     cur_loc->kind = LOC_CMDLINE;
121     cur_loc->num = cnt;
122     cur_loc->ptr = argv + idx;
123 }
124 
125 /*
126  * Change the current location to file FNAME, line LNO.
127  */
128 void loc_set_file(const char *fname, int lno)
129 {
130     assert (fname || cur_loc->kind == LOC_FILE);
131     cur_loc->kind = LOC_FILE;
132     cur_loc->num = lno;
133     if (fname) {
134         cur_loc->ptr = fname;
135     }
136 }
137 
138 /*
139  * Print current location to current monitor if we have one, else to stderr.
140  */
141 static void print_loc(void)
142 {
143     const char *sep = "";
144     int i;
145     const char *const *argp;
146 
147     if (!monitor_cur() && g_get_prgname()) {
148         error_printf("%s:", g_get_prgname());
149         sep = " ";
150     }
151     switch (cur_loc->kind) {
152     case LOC_CMDLINE:
153         argp = cur_loc->ptr;
154         for (i = 0; i < cur_loc->num; i++) {
155             error_printf("%s%s", sep, argp[i]);
156             sep = " ";
157         }
158         error_printf(": ");
159         break;
160     case LOC_FILE:
161         error_printf("%s:", (const char *)cur_loc->ptr);
162         if (cur_loc->num) {
163             error_printf("%d:", cur_loc->num);
164         }
165         error_printf(" ");
166         break;
167     default:
168         error_printf("%s", sep);
169     }
170 }
171 
172 static char *
173 real_time_iso8601(void)
174 {
175     g_autoptr(GDateTime) dt = g_date_time_new_now_utc();
176     return g_date_time_format_iso8601(dt);
177 }
178 
179 /*
180  * Print a message to current monitor if we have one, else to stderr.
181  * @report_type is the type of message: error, warning or informational.
182  * Format arguments like vsprintf().  The resulting message should be
183  * a single phrase, with no newline or trailing punctuation.
184  * Prepend the current location and append a newline.
185  */
186 G_GNUC_PRINTF(2, 0)
187 static void vreport(report_type type, const char *fmt, va_list ap)
188 {
189     gchar *timestr;
190 
191     if (message_with_timestamp && !monitor_cur()) {
192         timestr = real_time_iso8601();
193         error_printf("%s ", timestr);
194         g_free(timestr);
195     }
196 
197     /* Only prepend guest name if -msg guest-name and -name guest=... are set */
198     if (error_with_guestname && error_guest_name && !monitor_cur()) {
199         error_printf("%s ", error_guest_name);
200     }
201 
202     print_loc();
203 
204     switch (type) {
205     case REPORT_TYPE_ERROR:
206         break;
207     case REPORT_TYPE_WARNING:
208         error_printf("warning: ");
209         break;
210     case REPORT_TYPE_INFO:
211         error_printf("info: ");
212         break;
213     }
214 
215     error_vprintf(fmt, ap);
216     error_printf("\n");
217 }
218 
219 /*
220  * Print an error message to current monitor if we have one, else to stderr.
221  * Format arguments like vsprintf().  The resulting message should be
222  * a single phrase, with no newline or trailing punctuation.
223  * Prepend the current location and append a newline.
224  * It's wrong to call this in a QMP monitor.  Use error_setg() there.
225  */
226 void error_vreport(const char *fmt, va_list ap)
227 {
228     vreport(REPORT_TYPE_ERROR, fmt, ap);
229 }
230 
231 /*
232  * Print a warning message to current monitor if we have one, else to stderr.
233  * Format arguments like vsprintf().  The resulting message should be
234  * a single phrase, with no newline or trailing punctuation.
235  * Prepend the current location and append a newline.
236  */
237 void warn_vreport(const char *fmt, va_list ap)
238 {
239     vreport(REPORT_TYPE_WARNING, fmt, ap);
240 }
241 
242 /*
243  * Print an information message to current monitor if we have one, else to
244  * stderr.
245  * Format arguments like vsprintf().  The resulting message should be
246  * a single phrase, with no newline or trailing punctuation.
247  * Prepend the current location and append a newline.
248  */
249 void info_vreport(const char *fmt, va_list ap)
250 {
251     vreport(REPORT_TYPE_INFO, fmt, ap);
252 }
253 
254 /*
255  * Print an error message to current monitor if we have one, else to stderr.
256  * Format arguments like sprintf().  The resulting message should be
257  * a single phrase, with no newline or trailing punctuation.
258  * Prepend the current location and append a newline.
259  * It's wrong to call this in a QMP monitor.  Use error_setg() there.
260  */
261 void error_report(const char *fmt, ...)
262 {
263     va_list ap;
264 
265     va_start(ap, fmt);
266     vreport(REPORT_TYPE_ERROR, fmt, ap);
267     va_end(ap);
268 }
269 
270 /*
271  * Print a warning message to current monitor if we have one, else to stderr.
272  * Format arguments like sprintf(). The resulting message should be a
273  * single phrase, with no newline or trailing punctuation.
274  * Prepend the current location and append a newline.
275  */
276 void warn_report(const char *fmt, ...)
277 {
278     va_list ap;
279 
280     va_start(ap, fmt);
281     vreport(REPORT_TYPE_WARNING, fmt, ap);
282     va_end(ap);
283 }
284 
285 /*
286  * Print an information message to current monitor if we have one, else to
287  * stderr.
288  * Format arguments like sprintf(). The resulting message should be a
289  * single phrase, with no newline or trailing punctuation.
290  * Prepend the current location and append a newline.
291  */
292 void info_report(const char *fmt, ...)
293 {
294     va_list ap;
295 
296     va_start(ap, fmt);
297     vreport(REPORT_TYPE_INFO, fmt, ap);
298     va_end(ap);
299 }
300 
301 /*
302  * Like error_report(), except print just once.
303  * If *printed is false, print the message, and flip *printed to true.
304  * Return whether the message was printed.
305  */
306 bool error_report_once_cond(bool *printed, const char *fmt, ...)
307 {
308     va_list ap;
309 
310     assert(printed);
311     if (*printed) {
312         return false;
313     }
314     *printed = true;
315     va_start(ap, fmt);
316     vreport(REPORT_TYPE_ERROR, fmt, ap);
317     va_end(ap);
318     return true;
319 }
320 
321 /*
322  * Like warn_report(), except print just once.
323  * If *printed is false, print the message, and flip *printed to true.
324  * Return whether the message was printed.
325  */
326 bool warn_report_once_cond(bool *printed, const char *fmt, ...)
327 {
328     va_list ap;
329 
330     assert(printed);
331     if (*printed) {
332         return false;
333     }
334     *printed = true;
335     va_start(ap, fmt);
336     vreport(REPORT_TYPE_WARNING, fmt, ap);
337     va_end(ap);
338     return true;
339 }
340 
341 static char *qemu_glog_domains;
342 
343 static void qemu_log_func(const gchar *log_domain,
344                           GLogLevelFlags log_level,
345                           const gchar *message,
346                           gpointer user_data)
347 {
348     switch (log_level & G_LOG_LEVEL_MASK) {
349     case G_LOG_LEVEL_DEBUG:
350     case G_LOG_LEVEL_INFO:
351         /*
352          * Use same G_MESSAGES_DEBUG logic as glib to enable/disable debug
353          * messages
354          */
355         if (qemu_glog_domains == NULL) {
356             break;
357         }
358         if (strcmp(qemu_glog_domains, "all") != 0 &&
359           (log_domain == NULL || !strstr(qemu_glog_domains, log_domain))) {
360             break;
361         }
362         /* Fall through */
363     case G_LOG_LEVEL_MESSAGE:
364         info_report("%s%s%s",
365                     log_domain ?: "", log_domain ? ": " : "", message);
366 
367         break;
368     case G_LOG_LEVEL_WARNING:
369         warn_report("%s%s%s",
370                     log_domain ?: "", log_domain ? ": " : "", message);
371         break;
372     case G_LOG_LEVEL_CRITICAL:
373     case G_LOG_LEVEL_ERROR:
374         error_report("%s%s%s",
375                      log_domain ?: "", log_domain ? ": " : "", message);
376         break;
377     }
378 }
379 
380 void error_init(const char *argv0)
381 {
382     const char *p = strrchr(argv0, '/');
383 
384     /* Set the program name for error_print_loc(). */
385     g_set_prgname(p ? p + 1 : argv0);
386 
387     /*
388      * This sets up glib logging so libraries using it also print their logs
389      * through error_report(), warn_report(), info_report().
390      */
391     g_log_set_default_handler(qemu_log_func, NULL);
392     g_warn_if_fail(qemu_glog_domains == NULL);
393     qemu_glog_domains = g_strdup(g_getenv("G_MESSAGES_DEBUG"));
394 }
395