util/qemu-error.c

   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 int error_printf_unless_qmp(const char *fmt, ...)
  44 {
  45     va_list ap;
  46     int ret;
  47
  48     va_start(ap, fmt);
  49     ret = error_vprintf_unless_qmp(fmt, ap);
  50     va_end(ap);
  51     return ret;
  52 }
  53
  54 static Location std_loc = {
  55     .kind = LOC_NONE
  56 };
  57 static Location *cur_loc = &std_loc;
  58
  59 /*
  60  * Push location saved in LOC onto the location stack, return it.
  61  * The top of that stack is the current location.
  62  * Needs a matching loc_pop().
  63  */
  64 Location *loc_push_restore(Location *loc)
  65 {
  66     assert(!loc->prev);
  67     loc->prev = cur_loc;
  68     cur_loc = loc;
  69     return loc;
  70 }
  71
  72 /*
  73  * Initialize *LOC to "nowhere", push it onto the location stack.
  74  * The top of that stack is the current location.
  75  * Needs a matching loc_pop().
  76  * Return LOC.
  77  */
  78 Location *loc_push_none(Location *loc)
  79 {
  80     loc->kind = LOC_NONE;
  81     loc->prev = NULL;
  82     return loc_push_restore(loc);
  83 }
  84
  85 /*
  86  * Pop the location stack.
  87  * LOC must be the current location, i.e. the top of the stack.
  88  */
  89 Location *loc_pop(Location *loc)
  90 {
  91     assert(cur_loc == loc && loc->prev);
  92     cur_loc = loc->prev;
  93     loc->prev = NULL;
  94     return loc;
  95 }
  96
  97 /*
  98  * Save the current location in LOC, return LOC.
  99  */
 100 Location *loc_save(Location *loc)
 101 {
 102     *loc = *cur_loc;
 103     loc->prev = NULL;
 104     return loc;
 105 }
 106
 107 /*
 108  * Change the current location to the one saved in LOC.
 109  */
 110 void loc_restore(Location *loc)
 111 {
 112     Location *prev = cur_loc->prev;
 113     assert(!loc->prev);
 114     *cur_loc = *loc;
 115     cur_loc->prev = prev;
 116 }
 117
 118 /*
 119  * Change the current location to "nowhere in particular".
 120  */
 121 void loc_set_none(void)
 122 {
 123     cur_loc->kind = LOC_NONE;
 124 }
 125
 126 /*
 127  * Change the current location to argument ARGV[IDX..IDX+CNT-1].
 128  */
 129 void loc_set_cmdline(char **argv, int idx, int cnt)
 130 {
 131     cur_loc->kind = LOC_CMDLINE;
 132     cur_loc->num = cnt;
 133     cur_loc->ptr = argv + idx;
 134 }
 135
 136 /*
 137  * Change the current location to file FNAME, line LNO.
 138  */
 139 void loc_set_file(const char *fname, int lno)
 140 {
 141     assert (fname || cur_loc->kind == LOC_FILE);
 142     cur_loc->kind = LOC_FILE;
 143     cur_loc->num = lno;
 144     if (fname) {
 145         cur_loc->ptr = fname;
 146     }
 147 }
 148
 149 /*
 150  * Print current location to current monitor if we have one, else to stderr.
 151  */
 152 static void print_loc(void)
 153 {
 154     const char *sep = "";
 155     int i;
 156     const char *const *argp;
 157
 158     if (!monitor_cur() && g_get_prgname()) {
 159         fprintf(stderr, "%s:", g_get_prgname());
 160         sep = " ";
 161     }
 162     switch (cur_loc->kind) {
 163     case LOC_CMDLINE:
 164         argp = cur_loc->ptr;
 165         for (i = 0; i < cur_loc->num; i++) {
 166             error_printf("%s%s", sep, argp[i]);
 167             sep = " ";
 168         }
 169         error_printf(": ");
 170         break;
 171     case LOC_FILE:
 172         error_printf("%s:", (const char *)cur_loc->ptr);
 173         if (cur_loc->num) {
 174             error_printf("%d:", cur_loc->num);
 175         }
 176         error_printf(" ");
 177         break;
 178     default:
 179         error_printf("%s", sep);
 180     }
 181 }
 182
 183 /*
 184  * Print a message to current monitor if we have one, else to stderr.
 185  * @report_type is the type of message: error, warning or informational.
 186  * Format arguments like vsprintf().  The resulting message should be
 187  * a single phrase, with no newline or trailing punctuation.
 188  * Prepend the current location and append a newline.
 189  */
 190 static void vreport(report_type type, const char *fmt, va_list ap)
 191 {
 192     GTimeVal tv;
 193     gchar *timestr;
 194
 195     if (message_with_timestamp && !monitor_cur()) {
 196         g_get_current_time(&tv);
 197         timestr = g_time_val_to_iso8601(&tv);
 198         error_printf("%s ", timestr);
 199         g_free(timestr);
 200     }
 201
 202     /* Only prepend guest name if -msg guest-name and -name guest=... are set */
 203     if (error_with_guestname && error_guest_name && !monitor_cur()) {
 204         error_printf("%s ", error_guest_name);
 205     }
 206
 207     print_loc();
 208
 209     switch (type) {
 210     case REPORT_TYPE_ERROR:
 211         break;
 212     case REPORT_TYPE_WARNING:
 213         error_printf("warning: ");
 214         break;
 215     case REPORT_TYPE_INFO:
 216         error_printf("info: ");
 217         break;
 218     }
 219
 220     error_vprintf(fmt, ap);
 221     error_printf("\n");
 222 }
 223
 224 /*
 225  * Print an error message to current monitor if we have one, else to stderr.
 226  * Format arguments like vsprintf().  The resulting message should be
 227  * a single phrase, with no newline or trailing punctuation.
 228  * Prepend the current location and append a newline.
 229  * It's wrong to call this in a QMP monitor.  Use error_setg() there.
 230  */
 231 void error_vreport(const char *fmt, va_list ap)
 232 {
 233     vreport(REPORT_TYPE_ERROR, fmt, ap);
 234 }
 235
 236 /*
 237  * Print a warning message to current monitor if we have one, else to stderr.
 238  * Format arguments like vsprintf().  The resulting message should be
 239  * a single phrase, with no newline or trailing punctuation.
 240  * Prepend the current location and append a newline.
 241  */
 242 void warn_vreport(const char *fmt, va_list ap)
 243 {
 244     vreport(REPORT_TYPE_WARNING, fmt, ap);
 245 }
 246
 247 /*
 248  * Print an information message to current monitor if we have one, else to
 249  * stderr.
 250  * Format arguments like vsprintf().  The resulting message should be
 251  * a single phrase, with no newline or trailing punctuation.
 252  * Prepend the current location and append a newline.
 253  */
 254 void info_vreport(const char *fmt, va_list ap)
 255 {
 256     vreport(REPORT_TYPE_INFO, fmt, ap);
 257 }
 258
 259 /*
 260  * Print an error message to current monitor if we have one, else to stderr.
 261  * Format arguments like sprintf().  The resulting message should be
 262  * a single phrase, with no newline or trailing punctuation.
 263  * Prepend the current location and append a newline.
 264  * It's wrong to call this in a QMP monitor.  Use error_setg() there.
 265  */
 266 void error_report(const char *fmt, ...)
 267 {
 268     va_list ap;
 269
 270     va_start(ap, fmt);
 271     vreport(REPORT_TYPE_ERROR, fmt, ap);
 272     va_end(ap);
 273 }
 274
 275 /*
 276  * Print a warning message to current monitor if we have one, else to stderr.
 277  * Format arguments like sprintf(). The resulting message should be a
 278  * single phrase, with no newline or trailing punctuation.
 279  * Prepend the current location and append a newline.
 280  */
 281 void warn_report(const char *fmt, ...)
 282 {
 283     va_list ap;
 284
 285     va_start(ap, fmt);
 286     vreport(REPORT_TYPE_WARNING, fmt, ap);
 287     va_end(ap);
 288 }
 289
 290 /*
 291  * Print an information message to current monitor if we have one, else to
 292  * stderr.
 293  * Format arguments like sprintf(). The resulting message should be a
 294  * single phrase, with no newline or trailing punctuation.
 295  * Prepend the current location and append a newline.
 296  */
 297 void info_report(const char *fmt, ...)
 298 {
 299     va_list ap;
 300
 301     va_start(ap, fmt);
 302     vreport(REPORT_TYPE_INFO, fmt, ap);
 303     va_end(ap);
 304 }
 305
 306 /*
 307  * Like error_report(), except print just once.
 308  * If *printed is false, print the message, and flip *printed to true.
 309  * Return whether the message was printed.
 310  */
 311 bool error_report_once_cond(bool *printed, const char *fmt, ...)
 312 {
 313     va_list ap;
 314
 315     assert(printed);
 316     if (*printed) {
 317         return false;
 318     }
 319     *printed = true;
 320     va_start(ap, fmt);
 321     vreport(REPORT_TYPE_ERROR, fmt, ap);
 322     va_end(ap);
 323     return true;
 324 }
 325
 326 /*
 327  * Like warn_report(), except print just once.
 328  * If *printed is false, print the message, and flip *printed to true.
 329  * Return whether the message was printed.
 330  */
 331 bool warn_report_once_cond(bool *printed, const char *fmt, ...)
 332 {
 333     va_list ap;
 334
 335     assert(printed);
 336     if (*printed) {
 337         return false;
 338     }
 339     *printed = true;
 340     va_start(ap, fmt);
 341     vreport(REPORT_TYPE_WARNING, fmt, ap);
 342     va_end(ap);
 343     return true;
 344 }
 345
 346 static char *qemu_glog_domains;
 347
 348 static void qemu_log_func(const gchar *log_domain,
 349                           GLogLevelFlags log_level,
 350                           const gchar *message,
 351                           gpointer user_data)
 352 {
 353     switch (log_level & G_LOG_LEVEL_MASK) {
 354     case G_LOG_LEVEL_DEBUG:
 355     case G_LOG_LEVEL_INFO:
 356         /*
 357          * Use same G_MESSAGES_DEBUG logic as glib to enable/disable debug
 358          * messages
 359          */
 360         if (qemu_glog_domains == NULL) {
 361             break;
 362         }
 363         if (strcmp(qemu_glog_domains, "all") != 0 &&
 364           (log_domain == NULL || !strstr(qemu_glog_domains, log_domain))) {
 365             break;
 366         }
 367         /* Fall through */
 368     case G_LOG_LEVEL_MESSAGE:
 369         info_report("%s%s%s",
 370                     log_domain ?: "", log_domain ? ": " : "", message);
 371
 372         break;
 373     case G_LOG_LEVEL_WARNING:
 374         warn_report("%s%s%s",
 375                     log_domain ?: "", log_domain ? ": " : "", message);
 376         break;
 377     case G_LOG_LEVEL_CRITICAL:
 378     case G_LOG_LEVEL_ERROR:
 379         error_report("%s%s%s",
 380                      log_domain ?: "", log_domain ? ": " : "", message);
 381         break;
 382     }
 383 }
 384
 385 void error_init(const char *argv0)
 386 {
 387     const char *p = strrchr(argv0, '/');
 388
 389     /* Set the program name for error_print_loc(). */
 390     g_set_prgname(p ? p + 1 : argv0);
 391
 392     /*
 393      * This sets up glib logging so libraries using it also print their logs
 394      * through error_report(), warn_report(), info_report().
 395      */
 396     g_log_set_default_handler(qemu_log_func, NULL);
 397     g_warn_if_fail(qemu_glog_domains == NULL);
 398     qemu_glog_domains = g_strdup(g_getenv("G_MESSAGES_DEBUG"));
 399 }