src/helper/log.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007-2010 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "time_support.h"
  31 // @todo the inclusion of server.h here is a layering violation
  32 #include <server/server.h>
  33
  34 #include <stdarg.h>
  35
  36 #ifdef _DEBUG_FREE_SPACE_
  37 #ifdef HAVE_MALLOC_H
  38 #include <malloc.h>
  39 #else
  40 #error "malloc.h is required to use --enable-malloc-logging"
  41 #endif
  42 #endif
  43
  44 int debug_level = -1;
  45
  46 static FILE* log_output;
  47 static struct log_callback *log_callbacks = NULL;
  48
  49 static long long last_time;
  50 static long long current_time;
  51
  52 static long long start;
  53
  54 static char *log_strings[5] =
  55 {
  56         "User : ",
  57         "Error: ",
  58         "Warn : ",  /* want a space after each colon, all same width, colons aligned */
  59         "Info : ",
  60         "Debug: "
  61 };
  62
  63
  64 static int count = 0;
  65
  66
  67 static struct store_log_forward * log_head = NULL;
  68 static int log_forward_count = 0;
  69
  70 struct store_log_forward
  71 {
  72         struct store_log_forward * next;
  73         const char * file;
  74         int line;
  75         const char * function;
  76         const char * string;
  77 };
  78
  79 /* either forward the log to the listeners or store it for possible forwarding later */
  80 static void log_forward(const char *file, unsigned line, const char *function, const char *string)
  81 {
  82         if (log_forward_count==0)
  83         {
  84                 struct log_callback *cb, *next;
  85                 cb = log_callbacks;
  86                 /* DANGER!!!! the log callback can remove itself!!!! */
  87                 while (cb)
  88                 {
  89                         next = cb->next;
  90                         cb->fn(cb->priv, file, line, function, string);
  91                         cb = next;
  92                 }
  93         } else
  94         {
  95                 struct store_log_forward *log = malloc(sizeof (struct store_log_forward));
  96                 log->file = strdup(file);
  97                 log->line = line;
  98                 log->function = strdup(function);
  99                 log->string = strdup(string);
 100                 log->next = NULL;
 101                 if (log_head==NULL)
 102                         log_head = log;
 103                 else
 104                 {
 105                         /* append to tail */
 106                         struct store_log_forward * t;
 107                         t = log_head;
 108                         while (t->next!=NULL)
 109                         {
 110                                 t = t->next;
 111                         }
 112                         t->next = log;
 113                 }
 114         }
 115 }
 116
 117 /* The log_puts() serves to somewhat different goals:
 118  *
 119  * - logging
 120  * - feeding low-level info to the user in GDB or Telnet
 121  *
 122  * The latter dictates that strings without newline are not logged, lest there
 123  * will be *MANY log lines when sending one char at the time(e.g.
 124  * target_request.c).
 125  *
 126  */
 127 static void log_puts(enum log_levels level, const char *file, int line, const char *function, const char *string)
 128 {
 129         char *f;
 130         if (level == LOG_LVL_OUTPUT)
 131         {
 132                 /* do not prepend any headers, just print out what we were given and return */
 133                 fputs(string, log_output);
 134                 fflush(log_output);
 135                 return;
 136         }
 137
 138         f = strrchr(file, '/');
 139         if (f != NULL)
 140                 file = f + 1;
 141
 142         if (strlen(string) > 0)
 143         {
 144                 if (debug_level >= LOG_LVL_DEBUG)
 145                 {
 146                         /* print with count and time information */
 147                         int t = (int)(timeval_ms()-start);
 148 #ifdef _DEBUG_FREE_SPACE_
 149                         struct mallinfo info;
 150                         info = mallinfo();
 151 #endif
 152                         fprintf(log_output, "%s%d %d %s:%d %s()"
 153 #ifdef _DEBUG_FREE_SPACE_
 154                                         " %d"
 155 #endif
 156                                         ": %s", log_strings[level + 1], count, t, file, line, function,
 157 #ifdef _DEBUG_FREE_SPACE_
 158                                         info.fordblks,
 159 #endif
 160                                         string);
 161                 }
 162                 else
 163                 {
 164                         /* if we are using gdb through pipes then we do not want any output
 165                          * to the pipe otherwise we get repeated strings */
 166                         fprintf(log_output, "%s%s",
 167                                         (level > LOG_LVL_USER)?log_strings[level + 1]:"", string);
 168                 }
 169         } else
 170         {
 171                 /* Empty strings are sent to log callbacks to keep e.g. gdbserver alive, here we do nothing. */
 172         }
 173
 174         fflush(log_output);
 175
 176         /* Never forward LOG_LVL_DEBUG, too verbose and they can be found in the log if need be */
 177         if (level <= LOG_LVL_INFO)
 178         {
 179                 log_forward(file, line, function, string);
 180         }
 181 }
 182
 183
 184 void log_printf(enum log_levels level, const char *file, unsigned line, const char *function, const char *format, ...)
 185 {
 186         char *string;
 187         va_list ap;
 188
 189         count++;
 190         if (level > debug_level)
 191                 return;
 192
 193         va_start(ap, format);
 194
 195         string = alloc_vprintf(format, ap);
 196         if (string != NULL)
 197         {
 198                 log_puts(level, file, line, function, string);
 199                 free(string);
 200         }
 201
 202         va_end(ap);
 203 }
 204
 205 void log_printf_lf(enum log_levels level, const char *file, unsigned line, const char *function, const char *format, ...)
 206 {
 207         char *string;
 208         va_list ap;
 209
 210         count++;
 211         if (level > debug_level)
 212                 return;
 213
 214         va_start(ap, format);
 215
 216         string = alloc_vprintf(format, ap);
 217         if (string != NULL)
 218         {
 219                 strcat(string, "\n"); /* alloc_vprintf guaranteed the buffer to be at least one char longer */
 220                 log_puts(level, file, line, function, string);
 221                 free(string);
 222         }
 223
 224         va_end(ap);
 225 }
 226
 227 /* change the current debug level on the fly
 228  * 0: only ERRORS
 229  * 1: + WARNINGS
 230  * 2: + INFORMATIONAL MSGS
 231  * 3: + DEBUG MSGS
 232  */
 233 COMMAND_HANDLER(handle_debug_level_command)
 234 {
 235         if (CMD_ARGC == 1)
 236         {
 237                 unsigned new_level;
 238                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], new_level);
 239                 debug_level = MIN(new_level, LOG_LVL_DEBUG);
 240         }
 241         else if (CMD_ARGC > 1)
 242                 return ERROR_COMMAND_SYNTAX_ERROR;
 243
 244         command_print(CMD_CTX, "debug_level: %i", debug_level);
 245
 246         return ERROR_OK;
 247 }
 248
 249 COMMAND_HANDLER(handle_log_output_command)
 250 {
 251         if (CMD_ARGC == 1)
 252         {
 253                 FILE* file = fopen(CMD_ARGV[0], "w");
 254
 255                 if (file)
 256                 {
 257                         log_output = file;
 258                 }
 259         }
 260
 261         return ERROR_OK;
 262 }
 263
 264 static struct command_registration log_command_handlers[] = {
 265         {
 266                 .name = "log_output",
 267                 .handler = handle_log_output_command,
 268                 .mode = COMMAND_ANY,
 269                 .help = "redirect logging to a file (default: stderr)",
 270                 .usage = "file_name",
 271         },
 272         {
 273                 .name = "debug_level",
 274                 .handler = handle_debug_level_command,
 275                 .mode = COMMAND_ANY,
 276                 .help = "Sets the verbosity level of debugging output. "
 277                         "0 shows errors only; 1 adds warnings; "
 278                         "2 (default) adds other info; 3 adds debugging.",
 279                 .usage = "number",
 280         },
 281         COMMAND_REGISTRATION_DONE
 282 };
 283
 284 int log_register_commands(struct command_context *cmd_ctx)
 285 {
 286         return register_commands(cmd_ctx, NULL, log_command_handlers);
 287 }
 288
 289 void log_init(void)
 290 {
 291         /* set defaults for daemon configuration,
 292          * if not set by cmdline or cfgfile */
 293         if (debug_level == -1)
 294                 debug_level = LOG_LVL_INFO;
 295
 296         char *debug_env = getenv("OPENOCD_DEBUG_LEVEL");
 297         if (NULL != debug_env)
 298         {
 299                 int value;
 300                 int retval = parse_int(debug_env, &value);
 301                 if (ERROR_OK == retval &&
 302                                 debug_level >= LOG_LVL_SILENT &&
 303                                 debug_level <= LOG_LVL_DEBUG)
 304                 {
 305                         debug_level = value;
 306                 }
 307         }
 308
 309         if (log_output == NULL)
 310                 log_output = stderr;
 311
 312         start = last_time = timeval_ms();
 313 }
 314
 315 int set_log_output(struct command_context *cmd_ctx, FILE *output)
 316 {
 317         log_output = output;
 318         return ERROR_OK;
 319 }
 320
 321 /* add/remove log callback handler */
 322 int log_add_callback(log_callback_fn fn, void *priv)
 323 {
 324         struct log_callback *cb;
 325
 326         /* prevent the same callback to be registered more than once, just for sure */
 327         for (cb = log_callbacks; cb; cb = cb->next)
 328         {
 329                 if (cb->fn == fn && cb->priv == priv)
 330                         return ERROR_INVALID_ARGUMENTS;
 331         }
 332
 333         /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
 334         if ((cb = malloc(sizeof(struct log_callback))) == NULL)
 335                 return ERROR_BUF_TOO_SMALL;
 336
 337         /* add item to the beginning of the linked list */
 338         cb->fn = fn;
 339         cb->priv = priv;
 340         cb->next = log_callbacks;
 341         log_callbacks = cb;
 342
 343         return ERROR_OK;
 344 }
 345
 346 int log_remove_callback(log_callback_fn fn, void *priv)
 347 {
 348         struct log_callback *cb, **p;
 349
 350         for (p = &log_callbacks; (cb = *p); p = &(*p)->next)
 351         {
 352                 if (cb->fn == fn && cb->priv == priv)
 353                 {
 354                         *p = cb->next;
 355                         free(cb);
 356                         return ERROR_OK;
 357                 }
 358         }
 359
 360         /* no such item */
 361         return ERROR_INVALID_ARGUMENTS;
 362 }
 363
 364 /* return allocated string w/printf() result */
 365 char *alloc_vprintf(const char *fmt, va_list ap)
 366 {
 367         va_list ap_copy;
 368         int len;
 369         char *string;
 370
 371         /* determine the length of the buffer needed */
 372         va_copy(ap_copy, ap);
 373         len = vsnprintf(NULL, 0, fmt, ap_copy);
 374         va_end(ap_copy);
 375
 376         /* allocate and make room for terminating zero. */
 377         /* FIXME: The old version always allocated at least one byte extra and
 378          * other code depend on that. They should be probably be fixed, but for
 379          * now reserve the extra byte. */
 380         string = malloc(len + 2);
 381         if (string == NULL)
 382                 return NULL;
 383
 384         /* do the real work */
 385         vsnprintf(string, len + 1, fmt, ap);
 386
 387         return string;
 388 }
 389
 390 char *alloc_printf(const char *format, ...)
 391 {
 392         char *string;
 393         va_list ap;
 394         va_start(ap, format);
 395         string = alloc_vprintf(format, ap);
 396         va_end(ap);
 397         return string;
 398 }
 399
 400 /* Code must return to the server loop before 1000ms has returned or invoke
 401  * this function.
 402  *
 403  * The GDB connection will time out if it spends >2000ms and you'll get nasty
 404  * error messages from GDB:
 405  *
 406  * Ignoring packet error, continuing...
 407  * Reply contains invalid hex digit 116
 408  *
 409  * While it is possible use "set remotetimeout" to more than the default 2000ms
 410  * in GDB, OpenOCD guarantees that it sends keep-alive packages on the
 411  * GDB protocol and it is a bug in OpenOCD not to either return to the server
 412  * loop or invoke keep_alive() every 1000ms.
 413  *
 414  * This function will send a keep alive packet if >500ms has passed since last time
 415  * it was invoked.
 416  *
 417  * Note that this function can be invoked often, so it needs to be relatively
 418  * fast when invoked more often than every 500ms.
 419  *
 420  */
 421 void keep_alive()
 422 {
 423         current_time = timeval_ms();
 424         if (current_time-last_time > 1000)
 425         {
 426                 extern int gdb_actual_connections;
 427
 428                 if (gdb_actual_connections)
 429                         LOG_WARNING("keep_alive() was not invoked in the "
 430                                 "1000ms timelimit. GDB alive packet not "
 431                                 "sent! (%lld). Workaround: increase "
 432                                 "\"set remotetimeout\" in GDB",
 433                                 current_time-last_time);
 434                 else
 435                         LOG_DEBUG("keep_alive() was not invoked in the "
 436                                 "1000ms timelimit (%lld). This may cause "
 437                                 "trouble with GDB connections.",
 438                                 current_time-last_time);
 439         }
 440         if (current_time-last_time > 500)
 441         {
 442                 /* this will keep the GDB connection alive */
 443                 LOG_USER_N("%s", "");
 444
 445                 /* DANGER!!!! do not add code to invoke e.g. target event processing,
 446                  * jim timer processing, etc. it can cause infinite recursion +
 447                  * jim event callbacks need to happen at a well defined time,
 448                  * not anywhere keep_alive() is invoked.
 449                  *
 450                  * These functions should be invoked at a well defined spot in server.c
 451                  */
 452
 453                 last_time = current_time;
 454         }
 455 }
 456
 457 /* reset keep alive timer without sending message */
 458 void kept_alive()
 459 {
 460         current_time = timeval_ms();
 461         last_time = current_time;
 462 }
 463
 464 /* if we sleep for extended periods of time, we must invoke keep_alive() intermittantly */
 465 void alive_sleep(uint64_t ms)
 466 {
 467         uint64_t napTime = 10;
 468         for (uint64_t i = 0; i < ms; i += napTime)
 469         {
 470                 uint64_t sleep_a_bit = ms - i;
 471                 if (sleep_a_bit > napTime)
 472                         sleep_a_bit = napTime;
 473
 474                 usleep(sleep_a_bit * 1000);
 475                 keep_alive();
 476         }
 477 }
 478
 479 void busy_sleep(uint64_t ms)
 480 {
 481         uint64_t then = timeval_ms();
 482         while (timeval_ms() - then < ms)
 483         {
 484                 /* busy wait */
 485         }
 486 }