src/helper/log.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 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.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 void log_try(void)
 118 {
 119         log_forward_count++;
 120 }
 121
 122 void log_catch(void)
 123 {
 124         assert(log_forward_count>0);
 125         log_forward_count--;
 126 }
 127
 128 void log_rethrow(void)
 129 {
 130         log_catch();
 131         if (log_forward_count==0)
 132         {
 133                 struct store_log_forward *log;
 134
 135                 log = log_head;
 136                 while (log != NULL)
 137                 {
 138                         log_forward(log->file, log->line, log->function, log->string);
 139
 140                         struct store_log_forward *t=log;
 141                         log = log->next;
 142
 143                         free((void *)t->file);
 144                         free((void *)t->function);
 145                         free((void *)t->string);
 146                         free(t);
 147
 148                 }
 149
 150                 log_head = NULL;
 151         }
 152 }
 153
 154
 155 /* The log_puts() serves to somewhat different goals:
 156  *
 157  * - logging
 158  * - feeding low-level info to the user in GDB or Telnet
 159  *
 160  * The latter dictates that strings without newline are not logged, lest there
 161  * will be *MANY log lines when sending one char at the time(e.g.
 162  * target_request.c).
 163  *
 164  */
 165 static void log_puts(enum log_levels level, const char *file, int line, const char *function, const char *string)
 166 {
 167         char *f;
 168         if (level == LOG_LVL_OUTPUT)
 169         {
 170                 /* do not prepend any headers, just print out what we were given and return */
 171                 fputs(string, log_output);
 172                 fflush(log_output);
 173                 return;
 174         }
 175
 176         f = strrchr(file, '/');
 177         if (f != NULL)
 178                 file = f + 1;
 179
 180         if (strchr(string, '\n') != NULL)
 181         {
 182                 if (debug_level >= LOG_LVL_DEBUG)
 183                 {
 184                         /* print with count and time information */
 185                         int t = (int)(timeval_ms()-start);
 186 #ifdef _DEBUG_FREE_SPACE_
 187                         struct mallinfo info;
 188                         info = mallinfo();
 189 #endif
 190                         fprintf(log_output, "%s%d %d %s:%d %s()"
 191 #ifdef _DEBUG_FREE_SPACE_
 192                                         " %d"
 193 #endif
 194                                         ": %s", log_strings[level + 1], count, t, file, line, function,
 195 #ifdef _DEBUG_FREE_SPACE_
 196                                         info.fordblks,
 197 #endif
 198                                         string);
 199                 }
 200                 else if (server_use_pipes == 0)
 201                 {
 202                         /* if we are using gdb through pipes then we do not want any output
 203                          * to the pipe otherwise we get repeated strings */
 204                         if (strcmp(string, "\n") != 0)
 205                         {
 206                                 /* print human readable output - but skip empty lines */
 207                                 fprintf(log_output, "%s%s",
 208                                                 (level > LOG_LVL_USER)?log_strings[level + 1]:"", string);
 209                         }
 210                 }
 211         } else
 212         {
 213                 /* only entire lines are logged. Otherwise it's
 214                  * single chars intended for the log callbacks. */
 215         }
 216
 217         fflush(log_output);
 218
 219         /* Never forward LOG_LVL_DEBUG, too verbose and they can be found in the log if need be */
 220         if (level <= LOG_LVL_INFO)
 221         {
 222                 log_forward(file, line, function, string);
 223         }
 224 }
 225
 226
 227 void log_printf(enum log_levels level, const char *file, unsigned line, const char *function, const char *format, ...)
 228 {
 229         char *string;
 230         va_list ap;
 231
 232         count++;
 233         if (level > debug_level)
 234                 return;
 235
 236         va_start(ap, format);
 237
 238         string = alloc_vprintf(format, ap);
 239         if (string != NULL)
 240         {
 241                 log_puts(level, file, line, function, string);
 242                 free(string);
 243         }
 244
 245         va_end(ap);
 246 }
 247
 248 void log_printf_lf(enum log_levels level, const char *file, unsigned line, const char *function, const char *format, ...)
 249 {
 250         char *string;
 251         va_list ap;
 252
 253         count++;
 254         if (level > debug_level)
 255                 return;
 256
 257         va_start(ap, format);
 258
 259         string = alloc_vprintf(format, ap);
 260         if (string != NULL)
 261         {
 262                 strcat(string, "\n"); /* alloc_vprintf guaranteed the buffer to be at least one char longer */
 263                 log_puts(level, file, line, function, string);
 264                 free(string);
 265         }
 266
 267         va_end(ap);
 268 }
 269
 270 /* change the current debug level on the fly
 271  * 0: only ERRORS
 272  * 1: + WARNINGS
 273  * 2: + INFORMATIONAL MSGS
 274  * 3: + DEBUG MSGS
 275  */
 276 COMMAND_HANDLER(handle_debug_level_command)
 277 {
 278         if (CMD_ARGC == 1)
 279         {
 280                 unsigned new_level;
 281                 COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], new_level);
 282                 debug_level = MIN(new_level, LOG_LVL_DEBUG);
 283         }
 284         else if (CMD_ARGC > 1)
 285                 return ERROR_COMMAND_SYNTAX_ERROR;
 286
 287         if (debug_level >= LOG_LVL_DEBUG && server_use_pipes == 1)
 288         {
 289                 /* if we are enabling debug info then we need to write to a log file
 290                  * otherwise the pipe will get full and cause issues with gdb */
 291                 FILE* file = fopen("openocd.log", "w");
 292                 if (file)
 293                 {
 294                         log_output = file;
 295                         LOG_WARNING("enabling log output as we are using pipes");
 296                 }
 297         }
 298
 299         command_print(cmd_ctx, "debug_level: %i", debug_level);
 300
 301         return ERROR_OK;
 302 }
 303
 304 COMMAND_HANDLER(handle_log_output_command)
 305 {
 306         if (CMD_ARGC == 1)
 307         {
 308                 FILE* file = fopen(CMD_ARGV[0], "w");
 309
 310                 if (file)
 311                 {
 312                         log_output = file;
 313                 }
 314         }
 315
 316         return ERROR_OK;
 317 }
 318
 319 int log_register_commands(struct command_context *cmd_ctx)
 320 {
 321         start = timeval_ms();
 322         register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
 323                 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
 324         register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
 325                 COMMAND_ANY, "adjust debug level <0-3>");
 326
 327         return ERROR_OK;
 328 }
 329
 330 int log_init(struct command_context *cmd_ctx)
 331 {
 332         /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
 333         if (debug_level == -1)
 334                 debug_level = LOG_LVL_INFO;
 335
 336         if (log_output == NULL)
 337         {
 338                 log_output = stderr;
 339         }
 340
 341         start = last_time = timeval_ms();
 342
 343         return ERROR_OK;
 344 }
 345
 346 int set_log_output(struct command_context *cmd_ctx, FILE *output)
 347 {
 348         log_output = output;
 349         return ERROR_OK;
 350 }
 351
 352 /* add/remove log callback handler */
 353 int log_add_callback(log_callback_fn fn, void *priv)
 354 {
 355         struct log_callback *cb;
 356
 357         /* prevent the same callback to be registered more than once, just for sure */
 358         for (cb = log_callbacks; cb; cb = cb->next)
 359         {
 360                 if (cb->fn == fn && cb->priv == priv)
 361                         return ERROR_INVALID_ARGUMENTS;
 362         }
 363
 364         /* alloc memory, it is safe just to return in case of an error, no need for the caller to check this */
 365         if ((cb = malloc(sizeof(struct log_callback))) == NULL)
 366                 return ERROR_BUF_TOO_SMALL;
 367
 368         /* add item to the beginning of the linked list */
 369         cb->fn = fn;
 370         cb->priv = priv;
 371         cb->next = log_callbacks;
 372         log_callbacks = cb;
 373
 374         return ERROR_OK;
 375 }
 376
 377 int log_remove_callback(log_callback_fn fn, void *priv)
 378 {
 379         struct log_callback *cb, **p;
 380
 381         for (p = &log_callbacks; (cb = *p); p = &(*p)->next)
 382         {
 383                 if (cb->fn == fn && cb->priv == priv)
 384                 {
 385                         *p = cb->next;
 386                         free(cb);
 387                         return ERROR_OK;
 388                 }
 389         }
 390
 391         /* no such item */
 392         return ERROR_INVALID_ARGUMENTS;
 393 }
 394
 395 /* return allocated string w/printf() result */
 396 char *alloc_vprintf(const char *fmt, va_list ap)
 397 {
 398         /* no buffer at the beginning, force realloc to do the job */
 399         char *string = NULL;
 400
 401         /* start with buffer size suitable for typical messages */
 402         int size = 128;
 403
 404         for (;;)
 405         {
 406                 char *t = string;
 407                 va_list ap_copy;
 408                 int ret;
 409                 string = realloc(string, size);
 410                 if (string == NULL)
 411                 {
 412                         if (t != NULL)
 413                                 free(t);
 414                         return NULL;
 415                 }
 416
 417                 va_copy(ap_copy, ap);
 418
 419                 ret = vsnprintf(string, size, fmt, ap_copy);
 420                 /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
 421                 if ((ret >= 0) && ((ret + 1) < size))
 422                         break;
 423
 424                 /* there was just enough or not enough space, allocate more in the next round */
 425                 size *= 2; /* double the buffer size */
 426         }
 427
 428         /* the returned buffer is by principle guaranteed to be at least one character longer */
 429         return string;
 430 }
 431
 432 char *alloc_printf(const char *format, ...)
 433 {
 434         char *string;
 435         va_list ap;
 436         va_start(ap, format);
 437         string = alloc_vprintf(format, ap);
 438         va_end(ap);
 439         return string;
 440 }
 441
 442 /* Code must return to the server loop before 1000ms has returned or invoke
 443  * this function.
 444  *
 445  * The GDB connection will time out if it spends >2000ms and you'll get nasty
 446  * error messages from GDB:
 447  *
 448  * Ignoring packet error, continuing...
 449  * Reply contains invalid hex digit 116
 450  *
 451  * While it is possible use "set remotetimeout" to more than the default 2000ms
 452  * in GDB, OpenOCD guarantees that it sends keep-alive packages on the
 453  * GDB protocol and it is a bug in OpenOCD not to either return to the server
 454  * loop or invoke keep_alive() every 1000ms.
 455  *
 456  * This function will send a keep alive packet if >500ms has passed since last time
 457  * it was invoked.
 458  *
 459  * Note that this function can be invoked often, so it needs to be relatively
 460  * fast when invoked more often than every 500ms.
 461  *
 462  */
 463 void keep_alive()
 464 {
 465         current_time = timeval_ms();
 466         if (current_time-last_time > 1000)
 467         {
 468                 extern int gdb_actual_connections;
 469
 470                 if (gdb_actual_connections)
 471                         LOG_WARNING("keep_alive() was not invoked in the "
 472                                 "1000ms timelimit. GDB alive packet not "
 473                                 "sent! (%lld). Workaround: increase "
 474                                 "\"set remotetimeout\" in GDB",
 475                                 current_time-last_time);
 476                 else
 477                         LOG_DEBUG("keep_alive() was not invoked in the "
 478                                 "1000ms timelimit (%lld). This may cause "
 479                                 "trouble with GDB connections.",
 480                                 current_time-last_time);
 481         }
 482         if (current_time-last_time > 500)
 483         {
 484                 /* this will keep the GDB connection alive */
 485                 LOG_USER_N("%s", "");
 486
 487                 /* DANGER!!!! do not add code to invoke e.g. target event processing,
 488                  * jim timer processing, etc. it can cause infinite recursion +
 489                  * jim event callbacks need to happen at a well defined time,
 490                  * not anywhere keep_alive() is invoked.
 491                  *
 492                  * These functions should be invoked at a well defined spot in server.c
 493                  */
 494
 495                 last_time = current_time;
 496         }
 497 }
 498
 499 /* reset keep alive timer without sending message */
 500 void kept_alive()
 501 {
 502         current_time = timeval_ms();
 503         last_time = current_time;
 504 }
 505
 506 /* if we sleep for extended periods of time, we must invoke keep_alive() intermittantly */
 507 void alive_sleep(uint64_t ms)
 508 {
 509         uint64_t napTime = 10;
 510         for (uint64_t i = 0; i < ms; i += napTime)
 511         {
 512                 uint64_t sleep_a_bit = ms - i;
 513                 if (sleep_a_bit > napTime)
 514                         sleep_a_bit = napTime;
 515
 516                 usleep(sleep_a_bit * 1000);
 517                 keep_alive();
 518         }
 519 }
 520
 521 void busy_sleep(uint64_t ms)
 522 {
 523         uint64_t then = timeval_ms();
 524         while (timeval_ms() - then < ms)
 525         {
 526                 /* busy wait */
 527         }
 528 }