guicast/bcsignals.C

   1 #include "bcsignals.h"
   2 #include "bcwindowbase.inc"
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 BC_Signals* BC_Signals::global_signals = 0;
   9 static int signal_done = 0;
  10 static int table_id = 0;
  11
  12 static bc_locktrace_t* new_bc_locktrace(void *ptr,
  13         char *title,
  14         char *location)
  15 {
  16         bc_locktrace_t *result = (bc_locktrace_t*)malloc(sizeof(bc_locktrace_t));
  17         result->ptr = ptr;
  18         result->title = title;
  19         result->location = location;
  20         result->is_owner = 0;
  21         result->id = table_id++;
  22         return result;
  23 }
  24
  25
  26
  27
  28
  29 typedef struct
  30 {
  31         int size;
  32         void *ptr;
  33         char *location;
  34 } bc_buffertrace_t;
  35
  36 static bc_buffertrace_t* new_bc_buffertrace(int size, void *ptr, char *location)
  37 {
  38         bc_buffertrace_t *result = (bc_buffertrace_t*)malloc(sizeof(bc_buffertrace_t));
  39         result->size = size;
  40         result->ptr = ptr;
  41         result->location = location;
  42         return result;
  43 }
  44
  45
  46
  47
  48
  49
  50 // Need our own table to avoid recursion with the memory manager
  51 typedef struct
  52 {
  53         void **values;
  54         int size;
  55         int allocation;
  56 // This points to the next value to replace if the table wraps around
  57         int current_value;
  58 } bc_table_t;
  59
  60 static void* append_table(bc_table_t *table, void *ptr)
  61 {
  62         if(table->allocation <= table->size)
  63         {
  64                 if(table->allocation)
  65                 {
  66                         int new_allocation = table->allocation * 2;
  67                         void **new_values = (void**)calloc(new_allocation, sizeof(void*));
  68                         memcpy(new_values, table->values, sizeof(void*) * table->size);
  69                         free(table->values);
  70                         table->values = new_values;
  71                         table->allocation = new_allocation;
  72                 }
  73                 else
  74                 {
  75                         table->allocation = 4096;
  76                         table->values = (void**)calloc(table->allocation, sizeof(void*));
  77                 }
  78         }
  79
  80         table->values[table->size++] = ptr;
  81         return ptr;
  82 }
  83
  84 // Replace item in table pointed to by current_value and advance
  85 // current_value
  86 static void* overwrite_table(bc_table_t *table, void *ptr)
  87 {
  88         free(table->values[table->current_value]);
  89         table->values[table->current_value++] = ptr;
  90         if(table->current_value >= table->size) table->current_value = 0;
  91 }
  92
  93 static void clear_table(bc_table_t *table, int delete_objects)
  94 {
  95         if(delete_objects)
  96         {
  97                 for(int i = 0; i < table->size; i++)
  98                 {
  99                         free(table->values[i]);
 100                 }
 101         }
 102         table->size = 0;
 103 }
 104
 105 static void clear_table_entry(bc_table_t *table, int number, int delete_object)
 106 {
 107         if(delete_object) free(table->values[number]);
 108         for(int i = number; i < table->size - 1; i++)
 109         {
 110                 table->values[i] = table->values[i + 1];
 111         }
 112         table->size--;
 113 }
 114
 115
 116 // Table of functions currently running.
 117 static bc_table_t execution_table = { 0, 0, 0, 0 };
 118
 119 // Table of locked positions
 120 static bc_table_t lock_table = { 0, 0, 0, 0 };
 121
 122 // Table of buffers
 123 static bc_table_t memory_table = { 0, 0, 0, 0 };
 124
 125 static bc_table_t temp_files = { 0, 0, 0, 0 };
 126
 127 // Can't use Mutex because it would be recursive
 128 static pthread_mutex_t *lock = 0;
 129 static pthread_mutex_t *handler_lock = 0;
 130 // Don't trace memory until this is true to avoid initialization
 131 static int trace_memory = 0;
 132
 133
 134 static char* signal_titles[] =
 135 {
 136         "NULL",
 137         "SIGHUP",
 138         "SIGINT",
 139         "SIGQUIT",
 140         "SIGILL",
 141         "SIGTRAP",
 142         "SIGABRT",
 143         "SIGBUS",
 144         "SIGFPE",
 145         "SIGKILL",
 146         "SIGUSR1",
 147         "SIGSEGV",
 148         "SIGUSR2",
 149         "SIGPIPE",
 150         "SIGALRM",
 151         "SIGTERM"
 152 };
 153
 154 static void signal_entry(int signum)
 155 {
 156         signal(signum, SIG_DFL);
 157
 158         pthread_mutex_lock(handler_lock);
 159         if(signal_done)
 160         {
 161                 pthread_mutex_unlock(handler_lock);
 162                 exit(0);
 163         }
 164
 165         signal_done = 1;
 166         pthread_mutex_unlock(handler_lock);
 167
 168
 169         printf("signal_entry: got %s my pid=%d execution table size=%d:\n",
 170                 signal_titles[signum],
 171                 getpid(),
 172                 execution_table.size);
 173
 174         BC_Signals::dump_traces();
 175         BC_Signals::dump_locks();
 176         BC_Signals::dump_buffers();
 177         BC_Signals::delete_temps();
 178
 179 // Call user defined signal handler
 180         BC_Signals::global_signals->signal_handler(signum);
 181
 182         abort();
 183 }
 184
 185 static void signal_entry_recoverable(int signum)
 186 {
 187         printf("signal_entry_recoverable: got %s my pid=%d\n",
 188                 signal_titles[signum],
 189                 getpid());
 190 }
 191
 192 BC_Signals::BC_Signals()
 193 {
 194 }
 195
 196 void BC_Signals::dump_traces()
 197 {
 198 // Dump trace table
 199         if(execution_table.size)
 200         {
 201                 for(int i = execution_table.current_value; i < execution_table.size; i++)
 202                         printf("    %s\n", execution_table.values[i]);
 203                 for(int i = 0; i < execution_table.current_value; i++)
 204                         printf("    %s\n", execution_table.values[i]);
 205         }
 206
 207 }
 208
 209 void BC_Signals::dump_locks()
 210 {
 211 // Dump lock table
 212         printf("signal_entry: lock table size=%d\n", lock_table.size);
 213         for(int i = 0; i < lock_table.size; i++)
 214         {
 215                 bc_locktrace_t *table = (bc_locktrace_t*)lock_table.values[i];
 216                 printf("    %p %s %s %s\n",
 217                         table->ptr,
 218                         table->title,
 219                         table->location,
 220                         table->is_owner ? "*" : "");
 221         }
 222
 223 }
 224
 225 void BC_Signals::dump_buffers()
 226 {
 227         pthread_mutex_lock(lock);
 228 // Dump buffer table
 229         printf("BC_Signals::dump_buffers: buffer table size=%d\n", memory_table.size);
 230         for(int i = 0; i < memory_table.size; i++)
 231         {
 232                 bc_buffertrace_t *entry = (bc_buffertrace_t*)memory_table.values[i];
 233                 printf("    %d %p %s\n", entry->size, entry->ptr, entry->location);
 234         }
 235         pthread_mutex_unlock(lock);
 236 }
 237
 238 void BC_Signals::delete_temps()
 239 {
 240         pthread_mutex_lock(lock);
 241         printf("BC_Signals::delete_temps: deleting %d temp files\n", temp_files.size);
 242         for(int i = 0; i < temp_files.size; i++)
 243         {
 244                 printf("    %s\n", (char*)temp_files.values[i]);
 245                 remove((char*)temp_files.values[i]);
 246         }
 247         pthread_mutex_unlock(lock);
 248 }
 249
 250 void BC_Signals::set_temp(char *string)
 251 {
 252         char *new_string = strdup(string);
 253         append_table(&temp_files, new_string);
 254 }
 255
 256 void BC_Signals::unset_temp(char *string)
 257 {
 258         for(int i = 0; i < temp_files.size; i++)
 259         {
 260                 if(!strcmp((char*)temp_files.values[i], string))
 261                 {
 262                         clear_table_entry(&temp_files, i, 1);
 263                         break;
 264                 }
 265         }
 266 }
 267
 268
 269 void BC_Signals::initialize()
 270 {
 271         BC_Signals::global_signals = this;
 272         lock = (pthread_mutex_t*)calloc(1, sizeof(pthread_mutex_t));
 273         handler_lock = (pthread_mutex_t*)calloc(1, sizeof(pthread_mutex_t));
 274         pthread_mutex_init(lock, 0);
 275         pthread_mutex_init(handler_lock, 0);
 276
 277         initialize2();
 278 }
 279
 280
 281 void BC_Signals::initialize2()
 282 {
 283         signal(SIGHUP, signal_entry);
 284         signal(SIGINT, signal_entry);
 285         signal(SIGQUIT, signal_entry);
 286         // SIGKILL cannot be stopped
 287         // signal(SIGKILL, signal_entry);
 288         signal(SIGSEGV, signal_entry);
 289         signal(SIGTERM, signal_entry);
 290         signal(SIGFPE, signal_entry);
 291         signal(SIGPIPE, signal_entry_recoverable);
 292 }
 293
 294
 295 void BC_Signals::signal_handler(int signum)
 296 {
 297 printf("BC_Signals::signal_handler\n");
 298 //      exit(0);
 299 }
 300
 301 char* BC_Signals::sig_to_str(int number)
 302 {
 303         return signal_titles[number];
 304 }
 305
 306 #define TOTAL_TRACES 16
 307
 308 void BC_Signals::new_trace(char *text)
 309 {
 310         if(!global_signals) return;
 311         pthread_mutex_lock(lock);
 312
 313 // Wrap around
 314         if(execution_table.size >= TOTAL_TRACES)
 315         {
 316                 overwrite_table(&execution_table, strdup(text));
 317 //              clear_table(&execution_table, 1);
 318         }
 319         else
 320         {
 321                 append_table(&execution_table, strdup(text));
 322         }
 323         pthread_mutex_unlock(lock);
 324 }
 325
 326 void BC_Signals::new_trace(const char *file, const char *function, int line)
 327 {
 328         char string[BCTEXTLEN];
 329         snprintf(string, BCTEXTLEN, "%s: %s: %d", file, function, line);
 330         new_trace(string);
 331 }
 332
 333 void BC_Signals::delete_traces()
 334 {
 335         if(!global_signals) return;
 336         pthread_mutex_lock(lock);
 337         clear_table(&execution_table, 0);
 338         pthread_mutex_unlock(lock);
 339 }
 340
 341 #define TOTAL_LOCKS 100
 342
 343 int BC_Signals::set_lock(void *ptr,
 344         char *title,
 345         char *location)
 346 {
 347         if(!global_signals) return 0;
 348         bc_locktrace_t *table = 0;
 349         int id_return = 0;
 350
 351         pthread_mutex_lock(lock);
 352         if(lock_table.size >= TOTAL_LOCKS)
 353                 clear_table(&lock_table, 0);
 354
 355 // Put new lock entry
 356         table = new_bc_locktrace(ptr, title, location);
 357         append_table(&lock_table, table);
 358         id_return = table->id;
 359
 360         pthread_mutex_unlock(lock);
 361         return id_return;
 362 }
 363
 364 void BC_Signals::set_lock2(int table_id)
 365 {
 366         if(!global_signals) return;
 367
 368         bc_locktrace_t *table = 0;
 369         pthread_mutex_lock(lock);
 370         for(int i = lock_table.size - 1; i >= 0; i--)
 371         {
 372                 table = (bc_locktrace_t*)lock_table.values[i];
 373 // Got it.  Hasn't been unlocked/deleted yet.
 374                 if(table->id == table_id)
 375                 {
 376                         table->is_owner = 1;
 377                         pthread_mutex_unlock(lock);
 378                         return;
 379                 }
 380         }
 381         pthread_mutex_unlock(lock);
 382 }
 383
 384 void BC_Signals::unset_lock2(int table_id)
 385 {
 386         if(!global_signals) return;
 387
 388         bc_locktrace_t *table = 0;
 389         pthread_mutex_lock(lock);
 390         for(int i = lock_table.size - 1; i >= 0; i--)
 391         {
 392                 table = (bc_locktrace_t*)lock_table.values[i];
 393                 if(table->id == table_id)
 394                 {
 395                         clear_table_entry(&lock_table, i, 1);
 396                         pthread_mutex_unlock(lock);
 397                         return;
 398                 }
 399         }
 400         pthread_mutex_unlock(lock);
 401 }
 402
 403 void BC_Signals::unset_lock(void *ptr)
 404 {
 405         if(!global_signals) return;
 406
 407         bc_locktrace_t *table = 0;
 408         pthread_mutex_lock(lock);
 409
 410 // Take off currently held entry
 411         for(int i = 0; i < lock_table.size; i++)
 412         {
 413                 table = (bc_locktrace_t*)lock_table.values[i];
 414                 if(table->ptr == ptr)
 415                 {
 416                         if(table->is_owner)
 417                         {
 418                                 clear_table_entry(&lock_table, i, 1);
 419                                 pthread_mutex_unlock(lock);
 420                                 return;
 421                         }
 422                 }
 423         }
 424
 425         pthread_mutex_unlock(lock);
 426 }
 427
 428
 429 void BC_Signals::unset_all_locks(void *ptr)
 430 {
 431         if(!global_signals) return;
 432         pthread_mutex_lock(lock);
 433 // Take off previous lock entry
 434         for(int i = 0; i < lock_table.size; i++)
 435         {
 436                 bc_locktrace_t *table = (bc_locktrace_t*)lock_table.values[i];
 437                 if(table->ptr == ptr)
 438                 {
 439                         clear_table_entry(&lock_table, i, 1);
 440                 }
 441         }
 442         pthread_mutex_unlock(lock);
 443 }
 444
 445
 446 void BC_Signals::enable_memory()
 447 {
 448         trace_memory = 1;
 449 }
 450
 451 void BC_Signals::disable_memory()
 452 {
 453         trace_memory = 0;
 454 }
 455
 456
 457 void BC_Signals::set_buffer(int size, void *ptr, char* location)
 458 {
 459         if(!global_signals) return;
 460         if(!trace_memory) return;
 461
 462 //printf("BC_Signals::set_buffer %p %s\n", ptr, location);
 463         pthread_mutex_lock(lock);
 464         append_table(&memory_table, new_bc_buffertrace(size, ptr, location));
 465         pthread_mutex_unlock(lock);
 466 }
 467
 468 int BC_Signals::unset_buffer(void *ptr)
 469 {
 470         if(!global_signals) return 0;
 471         if(!trace_memory) return 0;
 472
 473         pthread_mutex_lock(lock);
 474         for(int i = 0; i < memory_table.size; i++)
 475         {
 476                 if(((bc_buffertrace_t*)memory_table.values[i])->ptr == ptr)
 477                 {
 478 //printf("BC_Signals::unset_buffer %p\n", ptr);
 479                         clear_table_entry(&memory_table, i, 1);
 480                         pthread_mutex_unlock(lock);
 481                         return 0;
 482                 }
 483         }
 484
 485         pthread_mutex_unlock(lock);
 486 //      fprintf(stderr, "BC_Signals::unset_buffer buffer %p not found.\n", ptr);
 487         return 1;
 488 }
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502 #ifdef TRACE_MEMORY
 503
 504 // void* operator new(size_t size)
 505 // {
 506 // //printf("new 1 %d\n", size);
 507 //     void *result = malloc(size);
 508 //      BUFFER(size, result, "new");
 509 // //printf("new 2 %d\n", size);
 510 //      return result;
 511 // }
 512 //
 513 // void* operator new[](size_t size)
 514 // {
 515 // //printf("new [] 1 %d\n", size);
 516 //     void *result = malloc(size);
 517 //      BUFFER(size, result, "new []");
 518 // //printf("new [] 2 %d\n", size);
 519 //      return result;
 520 // }
 521 //
 522 // void operator delete(void *ptr)
 523 // {
 524 // //printf("delete 1 %p\n", ptr);
 525 //      UNBUFFER(ptr);
 526 // //printf("delete 2 %p\n", ptr);
 527 //     free(ptr);
 528 // }
 529 //
 530 // void operator delete[](void *ptr)
 531 // {
 532 // //printf("delete [] 1 %p\n", ptr);
 533 //      UNBUFFER(ptr);
 534 //     free(ptr);
 535 // //printf("delete [] 2 %p\n", ptr);
 536 // }
 537
 538
 539 #endif
 540 /*
 541 //      Local Variables:
 542 //      mode: C++
 543 //      c-file-style: "linux"
 544 //      End:
 545 */