gdb/main.c

   1 /* Top level stuff for GDB, the GNU debugger.
   2    Copyright 1986-1995, 1999-2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "top.h"
  23 #include "target.h"
  24 #include "inferior.h"
  25 #include "call-cmds.h"
  26
  27 #include "getopt.h"
  28
  29 #include <sys/types.h>
  30 #include "gdb_stat.h"
  31 #include <ctype.h>
  32
  33 #include "gdb_string.h"
  34 #include "event-loop.h"
  35 #include "ui-out.h"
  36 #if defined (TUI) || defined (GDBTK)
  37 /* FIXME: cagney/2000-01-31: This #include is to allow older code such
  38    as that found in the TUI to continue to build. */
  39 #include "tui/tui-file.h"
  40 #endif
  41
  42 /* If nonzero, display time usage both at startup and for each command.  */
  43
  44 int display_time;
  45
  46 /* If nonzero, display space usage both at startup and for each command.  */
  47
  48 int display_space;
  49
  50 /* Whether this is the async version or not.  The async version is
  51    invoked on the command line with the -nw --async options.  In this
  52    version, the usual command_loop is substituted by and event loop which
  53    processes UI events asynchronously. */
  54 int event_loop_p = 1;
  55
  56 /* Whether this is the command line version or not */
  57 int tui_version = 0;
  58
  59 /* Whether xdb commands will be handled */
  60 int xdb_commands = 0;
  61
  62 /* Whether dbx commands will be handled */
  63 int dbx_commands = 0;
  64
  65 struct ui_file *gdb_stdout;
  66 struct ui_file *gdb_stderr;
  67 struct ui_file *gdb_stdlog;
  68 struct ui_file *gdb_stdtarg;
  69
  70 /* Used to initialize error() - defined in utils.c */
  71
  72 extern void error_init (void);
  73
  74 /* Whether to enable writing into executable and core files */
  75 extern int write_files;
  76
  77 static void print_gdb_help (struct ui_file *);
  78
  79 /* These two are used to set the external editor commands when gdb is farming
  80    out files to be edited by another program. */
  81
  82 extern int enable_external_editor;
  83 extern char *external_editor_command;
  84
  85 #ifdef __CYGWIN__
  86 #include <windows.h>            /* for MAX_PATH */
  87 #include <sys/cygwin.h>         /* for cygwin32_conv_to_posix_path */
  88 #endif
  89
  90 /* Call command_loop.  If it happens to return, pass that through as a
  91    non-zero return status. */
  92
  93 static int
  94 captured_command_loop (void *data)
  95 {
  96   if (command_loop_hook == NULL)
  97     command_loop ();
  98   else
  99     command_loop_hook ();
 100   /* FIXME: cagney/1999-11-05: A correct command_loop() implementaton
 101      would clean things up (restoring the cleanup chain) to the state
 102      they were just prior to the call.  Technically, this means that
 103      the do_cleanups() below is redundant.  Unfortunatly, many FUNC's
 104      are not that well behaved.  do_cleanups should either be replaced
 105      with a do_cleanups call (to cover the problem) or an assertion
 106      check to detect bad FUNCs code. */
 107   do_cleanups (ALL_CLEANUPS);
 108   /* If the command_loop returned, normally (rather than threw an
 109      error) we try to quit. If the quit is aborted, catch_errors()
 110      which called this catch the signal and restart the command
 111      loop. */
 112   quit_command (NULL, instream == stdin);
 113   return 1;
 114 }
 115
 116 struct captured_main_args
 117   {
 118     int argc;
 119     char **argv;
 120   };
 121
 122 static int
 123 captured_main (void *data)
 124 {
 125   struct captured_main_args *context = data;
 126   int argc = context->argc;
 127   char **argv = context->argv;
 128   int count;
 129   static int quiet = 0;
 130   static int batch = 0;
 131
 132   /* Pointers to various arguments from command line.  */
 133   char *symarg = NULL;
 134   char *execarg = NULL;
 135   char *corearg = NULL;
 136   char *cdarg = NULL;
 137   char *ttyarg = NULL;
 138
 139   /* These are static so that we can take their address in an initializer.  */
 140   static int print_help;
 141   static int print_version;
 142
 143   /* Pointers to all arguments of --command option.  */
 144   char **cmdarg;
 145   /* Allocated size of cmdarg.  */
 146   int cmdsize;
 147   /* Number of elements of cmdarg used.  */
 148   int ncmd;
 149
 150   /* Indices of all arguments of --directory option.  */
 151   char **dirarg;
 152   /* Allocated size.  */
 153   int dirsize;
 154   /* Number of elements used.  */
 155   int ndir;
 156
 157   struct stat homebuf, cwdbuf;
 158   char *homedir, *homeinit;
 159
 160   register int i;
 161
 162   long time_at_startup = get_run_time ();
 163
 164   START_PROGRESS (argv[0], 0);
 165
 166 #ifdef MPW
 167   /* Do all Mac-specific setup. */
 168   mac_init ();
 169 #endif /* MPW */
 170
 171   /* This needs to happen before the first use of malloc.  */
 172   init_malloc ((PTR) NULL);
 173
 174 #if defined (ALIGN_STACK_ON_STARTUP)
 175   i = (int) &count & 0x3;
 176   if (i != 0)
 177     alloca (4 - i);
 178 #endif
 179
 180   cmdsize = 1;
 181   cmdarg = (char **) xmalloc (cmdsize * sizeof (*cmdarg));
 182   ncmd = 0;
 183   dirsize = 1;
 184   dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
 185   ndir = 0;
 186
 187   quit_flag = 0;
 188   line = (char *) xmalloc (linesize);
 189   line[0] = '\0';               /* Terminate saved (now empty) cmd line */
 190   instream = stdin;
 191
 192   getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
 193   current_directory = gdb_dirbuf;
 194
 195 #if defined (TUI) || defined (GDBTK)
 196   /* Older code uses the tui_file and fputs_unfiltered_hook().  It
 197      should be using a customized UI_FILE object and re-initializing
 198      within its own _initialize function.  */
 199   gdb_stdout = tui_fileopen (stdout);
 200   gdb_stderr = tui_fileopen (stderr);
 201   gdb_stdlog = gdb_stdout;      /* for moment */
 202   gdb_stdtarg = gdb_stderr;     /* for moment */
 203 #else
 204   gdb_stdout = stdio_fileopen (stdout);
 205   gdb_stderr = stdio_fileopen (stderr);
 206   gdb_stdlog = gdb_stderr;      /* for moment */
 207   gdb_stdtarg = gdb_stderr;     /* for moment */
 208 #endif
 209
 210   /* initialize error() */
 211   error_init ();
 212
 213   /* Parse arguments and options.  */
 214   {
 215     int c;
 216     /* When var field is 0, use flag field to record the equivalent
 217        short option (or arbitrary numbers starting at 10 for those
 218        with no equivalent).  */
 219     static struct option long_options[] =
 220     {
 221       {"async", no_argument, &event_loop_p, 1},
 222       {"noasync", no_argument, &event_loop_p, 0},
 223 #if defined(TUI)
 224       {"tui", no_argument, &tui_version, 1},
 225 #endif
 226       {"xdb", no_argument, &xdb_commands, 1},
 227       {"dbx", no_argument, &dbx_commands, 1},
 228       {"readnow", no_argument, &readnow_symbol_files, 1},
 229       {"r", no_argument, &readnow_symbol_files, 1},
 230       {"mapped", no_argument, &mapped_symbol_files, 1},
 231       {"m", no_argument, &mapped_symbol_files, 1},
 232       {"quiet", no_argument, &quiet, 1},
 233       {"q", no_argument, &quiet, 1},
 234       {"silent", no_argument, &quiet, 1},
 235       {"nx", no_argument, &inhibit_gdbinit, 1},
 236       {"n", no_argument, &inhibit_gdbinit, 1},
 237       {"batch", no_argument, &batch, 1},
 238       {"epoch", no_argument, &epoch_interface, 1},
 239
 240     /* This is a synonym for "--annotate=1".  --annotate is now preferred,
 241        but keep this here for a long time because people will be running
 242        emacses which use --fullname.  */
 243       {"fullname", no_argument, 0, 'f'},
 244       {"f", no_argument, 0, 'f'},
 245
 246       {"annotate", required_argument, 0, 12},
 247       {"help", no_argument, &print_help, 1},
 248       {"se", required_argument, 0, 10},
 249       {"symbols", required_argument, 0, 's'},
 250       {"s", required_argument, 0, 's'},
 251       {"exec", required_argument, 0, 'e'},
 252       {"e", required_argument, 0, 'e'},
 253       {"core", required_argument, 0, 'c'},
 254       {"c", required_argument, 0, 'c'},
 255       {"command", required_argument, 0, 'x'},
 256       {"version", no_argument, &print_version, 1},
 257       {"x", required_argument, 0, 'x'},
 258       {"ui", required_argument, 0, 'i'},
 259       {"interpreter", required_argument, 0, 'i'},
 260       {"i", required_argument, 0, 'i'},
 261       {"directory", required_argument, 0, 'd'},
 262       {"d", required_argument, 0, 'd'},
 263       {"cd", required_argument, 0, 11},
 264       {"tty", required_argument, 0, 't'},
 265       {"baud", required_argument, 0, 'b'},
 266       {"b", required_argument, 0, 'b'},
 267       {"nw", no_argument, &use_windows, 0},
 268       {"nowindows", no_argument, &use_windows, 0},
 269       {"w", no_argument, &use_windows, 1},
 270       {"windows", no_argument, &use_windows, 1},
 271       {"statistics", no_argument, 0, 13},
 272       {"write", no_argument, &write_files, 1},
 273 /* Allow machine descriptions to add more options... */
 274 #ifdef ADDITIONAL_OPTIONS
 275       ADDITIONAL_OPTIONS
 276 #endif
 277       {0, no_argument, 0, 0}
 278     };
 279
 280     while (1)
 281       {
 282         int option_index;
 283
 284         c = getopt_long_only (argc, argv, "",
 285                               long_options, &option_index);
 286         if (c == EOF)
 287           break;
 288
 289         /* Long option that takes an argument.  */
 290         if (c == 0 && long_options[option_index].flag == 0)
 291           c = long_options[option_index].val;
 292
 293         switch (c)
 294           {
 295           case 0:
 296             /* Long option that just sets a flag.  */
 297             break;
 298           case 10:
 299             symarg = optarg;
 300             execarg = optarg;
 301             break;
 302           case 11:
 303             cdarg = optarg;
 304             break;
 305           case 12:
 306             /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
 307             annotation_level = atoi (optarg);
 308             break;
 309           case 13:
 310             /* Enable the display of both time and space usage.  */
 311             display_time = 1;
 312             display_space = 1;
 313             break;
 314           case 'f':
 315             annotation_level = 1;
 316 /* We have probably been invoked from emacs.  Disable window interface.  */
 317             use_windows = 0;
 318             break;
 319           case 's':
 320             symarg = optarg;
 321             break;
 322           case 'e':
 323             execarg = optarg;
 324             break;
 325           case 'c':
 326             corearg = optarg;
 327             break;
 328           case 'x':
 329             cmdarg[ncmd++] = optarg;
 330             if (ncmd >= cmdsize)
 331               {
 332                 cmdsize *= 2;
 333                 cmdarg = (char **) xrealloc ((char *) cmdarg,
 334                                              cmdsize * sizeof (*cmdarg));
 335               }
 336             break;
 337           case 'd':
 338             dirarg[ndir++] = optarg;
 339             if (ndir >= dirsize)
 340               {
 341                 dirsize *= 2;
 342                 dirarg = (char **) xrealloc ((char *) dirarg,
 343                                              dirsize * sizeof (*dirarg));
 344               }
 345             break;
 346           case 't':
 347             ttyarg = optarg;
 348             break;
 349           case 'q':
 350             quiet = 1;
 351             break;
 352           case 'b':
 353             {
 354               int i;
 355               char *p;
 356
 357               i = strtol (optarg, &p, 0);
 358               if (i == 0 && p == optarg)
 359
 360                 /* Don't use *_filtered or warning() (which relies on
 361                    current_target) until after initialize_all_files(). */
 362
 363                 fprintf_unfiltered
 364                   (gdb_stderr,
 365                    "warning: could not set baud rate to `%s'.\n", optarg);
 366               else
 367                 baud_rate = i;
 368             }
 369           case 'l':
 370             {
 371               int i;
 372               char *p;
 373
 374               i = strtol (optarg, &p, 0);
 375               if (i == 0 && p == optarg)
 376
 377                 /* Don't use *_filtered or warning() (which relies on
 378                    current_target) until after initialize_all_files(). */
 379
 380                 fprintf_unfiltered
 381                   (gdb_stderr,
 382                  "warning: could not set timeout limit to `%s'.\n", optarg);
 383               else
 384                 remote_timeout = i;
 385             }
 386             break;
 387
 388 #ifdef ADDITIONAL_OPTION_CASES
 389             ADDITIONAL_OPTION_CASES
 390 #endif
 391           case '?':
 392             fprintf_unfiltered (gdb_stderr,
 393                         "Use `%s --help' for a complete list of options.\n",
 394                                 argv[0]);
 395             exit (1);
 396           }
 397       }
 398
 399     /* If --help or --version, disable window interface.  */
 400     if (print_help || print_version)
 401       {
 402         use_windows = 0;
 403 #ifdef TUI
 404         /* Disable the TUI as well.  */
 405         tui_version = 0;
 406 #endif
 407       }
 408
 409 #ifdef TUI
 410     /* An explicit --tui flag overrides the default UI, which is the
 411        window system.  */
 412     if (tui_version)
 413       use_windows = 0;
 414 #endif
 415
 416     /* OK, that's all the options.  The other arguments are filenames.  */
 417     count = 0;
 418     for (; optind < argc; optind++)
 419       switch (++count)
 420         {
 421         case 1:
 422           symarg = argv[optind];
 423           execarg = argv[optind];
 424           break;
 425         case 2:
 426           corearg = argv[optind];
 427           break;
 428         case 3:
 429           fprintf_unfiltered (gdb_stderr,
 430                           "Excess command line arguments ignored. (%s%s)\n",
 431                           argv[optind], (optind == argc - 1) ? "" : " ...");
 432           break;
 433         }
 434     if (batch)
 435       quiet = 1;
 436   }
 437
 438 #if defined(TUI)
 439   /* Should this be moved to tui-top.c:_initialize_tui()? */
 440   if (tui_version)
 441     init_ui_hook = tuiInit;
 442 #endif
 443
 444   /* Initialize all files.  Give the interpreter a chance to take
 445      control of the console via the init_ui_hook()) */
 446   gdb_init (argv[0]);
 447
 448   /* Do these (and anything which might call wrap_here or *_filtered)
 449      after initialize_all_files.  */
 450   if (print_version)
 451     {
 452       print_gdb_version (gdb_stdout);
 453       wrap_here ("");
 454       printf_filtered ("\n");
 455       exit (0);
 456     }
 457
 458   if (print_help)
 459     {
 460       print_gdb_help (gdb_stdout);
 461       fputs_unfiltered ("\n", gdb_stdout);
 462       exit (0);
 463     }
 464
 465   if (!quiet)
 466     {
 467       /* Print all the junk at the top, with trailing "..." if we are about
 468          to read a symbol file (possibly slowly).  */
 469       print_gdb_version (gdb_stdout);
 470       if (symarg)
 471         printf_filtered ("..");
 472       wrap_here ("");
 473       gdb_flush (gdb_stdout);   /* Force to screen during slow operations */
 474     }
 475
 476   error_pre_print = "\n\n";
 477   quit_pre_print = error_pre_print;
 478
 479   /* We may get more than one warning, don't double space all of them... */
 480   warning_pre_print = "\nwarning: ";
 481
 482   /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
 483      *before* all the command line arguments are processed; it sets
 484      global parameters, which are independent of what file you are
 485      debugging or what directory you are in.  */
 486 #ifdef __CYGWIN32__
 487   {
 488     char *tmp = getenv ("HOME");
 489
 490     if (tmp != NULL)
 491       {
 492         homedir = (char *) alloca (MAX_PATH + 1);
 493         cygwin32_conv_to_posix_path (tmp, homedir);
 494       }
 495     else
 496       homedir = NULL;
 497   }
 498 #else
 499   homedir = getenv ("HOME");
 500 #endif
 501   if (homedir)
 502     {
 503       homeinit = (char *) alloca (strlen (homedir) +
 504                                   strlen (gdbinit) + 10);
 505       strcpy (homeinit, homedir);
 506       strcat (homeinit, "/");
 507       strcat (homeinit, gdbinit);
 508
 509       if (!inhibit_gdbinit)
 510         {
 511           catch_command_errors (source_command, homeinit, 0, RETURN_MASK_ALL);
 512         }
 513
 514       /* Do stats; no need to do them elsewhere since we'll only
 515          need them if homedir is set.  Make sure that they are
 516          zero in case one of them fails (this guarantees that they
 517          won't match if either exists).  */
 518
 519       memset (&homebuf, 0, sizeof (struct stat));
 520       memset (&cwdbuf, 0, sizeof (struct stat));
 521
 522       stat (homeinit, &homebuf);
 523       stat (gdbinit, &cwdbuf);  /* We'll only need this if
 524                                    homedir was set.  */
 525     }
 526
 527   /* Now perform all the actions indicated by the arguments.  */
 528   if (cdarg != NULL)
 529     {
 530       catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
 531     }
 532
 533   for (i = 0; i < ndir; i++)
 534     catch_command_errors (directory_command, dirarg[i], 0, RETURN_MASK_ALL);
 535   free ((PTR) dirarg);
 536
 537   if (execarg != NULL
 538       && symarg != NULL
 539       && STREQ (execarg, symarg))
 540     {
 541       /* The exec file and the symbol-file are the same.  If we can't
 542          open it, better only print one error message.
 543          catch_command_errors returns non-zero on success! */
 544       if (catch_command_errors (exec_file_command, execarg, !batch, RETURN_MASK_ALL))
 545         catch_command_errors (symbol_file_command, symarg, 0, RETURN_MASK_ALL);
 546     }
 547   else
 548     {
 549       if (execarg != NULL)
 550         catch_command_errors (exec_file_command, execarg, !batch, RETURN_MASK_ALL);
 551       if (symarg != NULL)
 552         catch_command_errors (symbol_file_command, symarg, 0, RETURN_MASK_ALL);
 553     }
 554
 555   /* After the symbol file has been read, print a newline to get us
 556      beyond the copyright line...  But errors should still set off
 557      the error message with a (single) blank line.  */
 558   if (!quiet)
 559     printf_filtered ("\n");
 560   error_pre_print = "\n";
 561   quit_pre_print = error_pre_print;
 562   warning_pre_print = "\nwarning: ";
 563
 564   if (corearg != NULL)
 565     {
 566       if (catch_command_errors (core_file_command, corearg, !batch, RETURN_MASK_ALL) == 0)
 567         {
 568           /* See if the core file is really a PID. */
 569           if (isdigit (corearg[0]))
 570             catch_command_errors (attach_command, corearg, !batch, RETURN_MASK_ALL);
 571         }
 572     }
 573
 574   if (ttyarg != NULL)
 575     catch_command_errors (tty_command, ttyarg, !batch, RETURN_MASK_ALL);
 576
 577 #ifdef ADDITIONAL_OPTION_HANDLER
 578   ADDITIONAL_OPTION_HANDLER;
 579 #endif
 580
 581   /* Error messages should no longer be distinguished with extra output. */
 582   error_pre_print = NULL;
 583   quit_pre_print = NULL;
 584   warning_pre_print = "warning: ";
 585
 586   /* Read the .gdbinit file in the current directory, *if* it isn't
 587      the same as the $HOME/.gdbinit file (it should exist, also).  */
 588
 589   if (!homedir
 590       || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
 591     if (!inhibit_gdbinit)
 592       {
 593         catch_command_errors (source_command, gdbinit, 0, RETURN_MASK_ALL);
 594       }
 595
 596   for (i = 0; i < ncmd; i++)
 597     {
 598 #if 0
 599       /* NOTE: cagney/1999-11-03: SET_TOP_LEVEL() was a macro that
 600          expanded into a call to setjmp().  */
 601       if (!SET_TOP_LEVEL ()) /* NB: This is #if 0'd out */
 602         {
 603           /* NOTE: I am commenting this out, because it is not clear
 604              where this feature is used. It is very old and
 605              undocumented. ezannoni: 1999-05-04 */
 606 #if 0
 607           if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
 608             read_command_file (stdin);
 609           else
 610 #endif
 611             source_command (cmdarg[i], !batch);
 612           do_cleanups (ALL_CLEANUPS);
 613         }
 614 #endif
 615       catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
 616     }
 617   free ((PTR) cmdarg);
 618
 619   /* Read in the old history after all the command files have been read. */
 620   init_history ();
 621
 622   if (batch)
 623     {
 624       /* We have hit the end of the batch file.  */
 625       exit (0);
 626     }
 627
 628   /* Do any host- or target-specific hacks.  This is used for i960 targets
 629      to force the user to set a nindy target and spec its parameters.  */
 630
 631 #ifdef BEFORE_MAIN_LOOP_HOOK
 632   BEFORE_MAIN_LOOP_HOOK;
 633 #endif
 634
 635   END_PROGRESS (argv[0]);
 636
 637   /* Show time and/or space usage.  */
 638
 639   if (display_time)
 640     {
 641       long init_time = get_run_time () - time_at_startup;
 642
 643       printf_unfiltered ("Startup time: %ld.%06ld\n",
 644                          init_time / 1000000, init_time % 1000000);
 645     }
 646
 647   if (display_space)
 648     {
 649 #ifdef HAVE_SBRK
 650       extern char **environ;
 651       char *lim = (char *) sbrk (0);
 652
 653       printf_unfiltered ("Startup size: data size %ld\n",
 654                          (long) (lim - (char *) &environ));
 655 #endif
 656     }
 657
 658   /* The default command loop.
 659      The WIN32 Gui calls this main to set up gdb's state, and
 660      has its own command loop. */
 661 #if !defined _WIN32 || defined __GNUC__
 662   /* GUIs generally have their own command loop, mainloop, or
 663      whatever.  This is a good place to gain control because many
 664      error conditions will end up here via longjmp(). */
 665 #if 0
 666   /* FIXME: cagney/1999-11-06: The original main loop was like: */
 667   while (1)
 668     {
 669       if (!SET_TOP_LEVEL ())
 670         {
 671           do_cleanups (ALL_CLEANUPS);   /* Do complete cleanup */
 672           /* GUIs generally have their own command loop, mainloop, or whatever.
 673              This is a good place to gain control because many error
 674              conditions will end up here via longjmp(). */
 675           if (command_loop_hook)
 676             command_loop_hook ();
 677           else
 678             command_loop ();
 679           quit_command ((char *) 0, instream == stdin);
 680         }
 681     }
 682   /* NOTE: If the command_loop() returned normally, the loop would
 683      attempt to exit by calling the function quit_command().  That
 684      function would either call exit() or throw an error returning
 685      control to SET_TOP_LEVEL. */
 686   /* NOTE: The function do_cleanups() was called once each time round
 687      the loop.  The usefulness of the call isn't clear.  If an error
 688      was thrown, everything would have already been cleaned up.  If
 689      command_loop() returned normally and quit_command() was called,
 690      either exit() or error() (again cleaning up) would be called. */
 691 #endif
 692   /* NOTE: cagney/1999-11-07: There is probably no reason for not
 693      moving this loop and the code found in captured_command_loop()
 694      into the command_loop() proper.  The main thing holding back that
 695      change - SET_TOP_LEVEL() - has been eliminated. */
 696   while (1)
 697     {
 698       catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
 699     }
 700 #endif
 701   /* No exit -- exit is through quit_command.  */
 702 }
 703
 704 int
 705 main (int argc, char **argv)
 706 {
 707   struct captured_main_args args;
 708   args.argc = argc;
 709   args.argv = argv;
 710   catch_errors (captured_main, &args, "", RETURN_MASK_ALL);
 711   return 0;
 712 }
 713
 714
 715 /* Don't use *_filtered for printing help.  We don't want to prompt
 716    for continue no matter how small the screen or how much we're going
 717    to print.  */
 718
 719 static void
 720 print_gdb_help (struct ui_file *stream)
 721 {
 722   fputs_unfiltered ("\
 723 This is the GNU debugger.  Usage:\n\n\
 724     gdb [options] [executable-file [core-file or process-id]]\n\n\
 725 Options:\n\n\
 726 ", stream);
 727   fputs_unfiltered ("\
 728   --[no]async        Enable (disable) asynchronous version of CLI\n\
 729 ", stream);
 730   fputs_unfiltered ("\
 731   -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
 732   --batch            Exit after processing options.\n\
 733   --cd=DIR           Change current directory to DIR.\n\
 734   --command=FILE     Execute GDB commands from FILE.\n\
 735   --core=COREFILE    Analyze the core dump COREFILE.\n\
 736 ", stream);
 737   fputs_unfiltered ("\
 738   --dbx              DBX compatibility mode.\n\
 739   --directory=DIR    Search for source files in DIR.\n\
 740   --epoch            Output information used by epoch emacs-GDB interface.\n\
 741   --exec=EXECFILE    Use EXECFILE as the executable.\n\
 742   --fullname         Output information used by emacs-GDB interface.\n\
 743   --help             Print this message.\n\
 744 ", stream);
 745   fputs_unfiltered ("\
 746   --interpreter=INTERP\n\
 747                      Select a specific interpreter / user interface\n\
 748 ", stream);
 749   fputs_unfiltered ("\
 750   --mapped           Use mapped symbol files if supported on this system.\n\
 751   --nw               Do not use a window interface.\n\
 752   --nx               Do not read ", stream);
 753   fputs_unfiltered (gdbinit, stream);
 754   fputs_unfiltered (" file.\n\
 755   --quiet            Do not print version number on startup.\n\
 756   --readnow          Fully read symbol files on first access.\n\
 757 ", stream);
 758   fputs_unfiltered ("\
 759   --se=FILE          Use FILE as symbol file and executable file.\n\
 760   --symbols=SYMFILE  Read symbols from SYMFILE.\n\
 761   --tty=TTY          Use TTY for input/output by the program being debugged.\n\
 762 ", stream);
 763 #if defined(TUI)
 764   fputs_unfiltered ("\
 765   --tui              Use a terminal user interface.\n\
 766 ", stream);
 767 #endif
 768   fputs_unfiltered ("\
 769   --version          Print version information and then exit.\n\
 770   -w                 Use a window interface.\n\
 771   --write            Set writing into executable and core files.\n\
 772   --xdb              XDB compatibility mode.\n\
 773 ", stream);
 774 #ifdef ADDITIONAL_OPTION_HELP
 775   fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
 776 #endif
 777   fputs_unfiltered ("\n\
 778 For more information, type \"help\" from within GDB, or consult the\n\
 779 GDB manual (available as on-line info or a printed manual).\n\
 780 Report bugs to \"bug-gdb@gnu.org\".\
 781 ", stream);
 782 }