gdb/main.c

   1 /* Top level stuff for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   3    1996, 1997, 1998, 1999, 2000, 2001, 2002
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "top.h"
  25 #include "target.h"
  26 #include "inferior.h"
  27 #include "symfile.h"
  28 #include "gdbcore.h"
  29
  30 #include "getopt.h"
  31
  32 #include <sys/types.h>
  33 #include "gdb_stat.h"
  34 #include <ctype.h>
  35
  36 #include "gdb_string.h"
  37 #include "event-loop.h"
  38 #include "ui-out.h"
  39
  40 /* If nonzero, display time usage both at startup and for each command.  */
  41
  42 int display_time;
  43
  44 /* If nonzero, display space usage both at startup and for each command.  */
  45
  46 int display_space;
  47
  48 /* Whether this is the async version or not.  The async version is
  49    invoked on the command line with the -nw --async options.  In this
  50    version, the usual command_loop is substituted by and event loop which
  51    processes UI events asynchronously. */
  52 int event_loop_p = 1;
  53
  54 /* Has an interpreter been specified and if so, which. */
  55 char *interpreter_p;
  56
  57 /* Whether this is the command line version or not */
  58 int tui_version = 0;
  59
  60 /* Whether xdb commands will be handled */
  61 int xdb_commands = 0;
  62
  63 /* Whether dbx commands will be handled */
  64 int dbx_commands = 0;
  65
  66 struct ui_file *gdb_stdout;
  67 struct ui_file *gdb_stderr;
  68 struct ui_file *gdb_stdlog;
  69 struct ui_file *gdb_stdtarg;
  70
  71 /* Used to initialize error() - defined in utils.c */
  72
  73 extern void error_init (void);
  74
  75 /* Whether to enable writing into executable and core files */
  76 extern int write_files;
  77
  78 static void print_gdb_help (struct ui_file *);
  79
  80 /* These two are used to set the external editor commands when gdb is farming
  81    out files to be edited by another program. */
  82
  83 extern char *external_editor_command;
  84
  85 /* Call command_loop.  If it happens to return, pass that through as a
  86    non-zero return status. */
  87
  88 static int
  89 captured_command_loop (void *data)
  90 {
  91   if (command_loop_hook == NULL)
  92     command_loop ();
  93   else
  94     command_loop_hook ();
  95   /* FIXME: cagney/1999-11-05: A correct command_loop() implementaton
  96      would clean things up (restoring the cleanup chain) to the state
  97      they were just prior to the call.  Technically, this means that
  98      the do_cleanups() below is redundant.  Unfortunately, many FUNCs
  99      are not that well behaved.  do_cleanups should either be replaced
 100      with a do_cleanups call (to cover the problem) or an assertion
 101      check to detect bad FUNCs code. */
 102   do_cleanups (ALL_CLEANUPS);
 103   /* If the command_loop returned, normally (rather than threw an
 104      error) we try to quit. If the quit is aborted, catch_errors()
 105      which called this catch the signal and restart the command
 106      loop. */
 107   quit_command (NULL, instream == stdin);
 108   return 1;
 109 }
 110
 111 struct captured_main_args
 112   {
 113     int argc;
 114     char **argv;
 115   };
 116
 117 static int
 118 captured_main (void *data)
 119 {
 120   struct captured_main_args *context = data;
 121   int argc = context->argc;
 122   char **argv = context->argv;
 123   int count;
 124   static int quiet = 0;
 125   static int batch = 0;
 126   static int set_args = 0;
 127
 128   /* Pointers to various arguments from command line.  */
 129   char *symarg = NULL;
 130   char *execarg = NULL;
 131   char *corearg = NULL;
 132   char *cdarg = NULL;
 133   char *ttyarg = NULL;
 134
 135   /* These are static so that we can take their address in an initializer.  */
 136   static int print_help;
 137   static int print_version;
 138
 139   /* Pointers to all arguments of --command option.  */
 140   char **cmdarg;
 141   /* Allocated size of cmdarg.  */
 142   int cmdsize;
 143   /* Number of elements of cmdarg used.  */
 144   int ncmd;
 145
 146   /* Indices of all arguments of --directory option.  */
 147   char **dirarg;
 148   /* Allocated size.  */
 149   int dirsize;
 150   /* Number of elements used.  */
 151   int ndir;
 152
 153   struct stat homebuf, cwdbuf;
 154   char *homedir, *homeinit;
 155
 156   register int i;
 157
 158   long time_at_startup = get_run_time ();
 159
 160   START_PROGRESS (argv[0], 0);
 161
 162 #ifdef MPW
 163   /* Do all Mac-specific setup. */
 164   mac_init ();
 165 #endif /* MPW */
 166
 167   /* This needs to happen before the first use of malloc.  */
 168   init_malloc ((PTR) NULL);
 169
 170 #if defined (ALIGN_STACK_ON_STARTUP)
 171   i = (int) &count & 0x3;
 172   if (i != 0)
 173     alloca (4 - i);
 174 #endif
 175
 176   cmdsize = 1;
 177   cmdarg = (char **) xmalloc (cmdsize * sizeof (*cmdarg));
 178   ncmd = 0;
 179   dirsize = 1;
 180   dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
 181   ndir = 0;
 182
 183   quit_flag = 0;
 184   line = (char *) xmalloc (linesize);
 185   line[0] = '\0';               /* Terminate saved (now empty) cmd line */
 186   instream = stdin;
 187
 188   getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
 189   current_directory = gdb_dirbuf;
 190
 191   gdb_stdout = stdio_fileopen (stdout);
 192   gdb_stderr = stdio_fileopen (stderr);
 193   gdb_stdlog = gdb_stderr;      /* for moment */
 194   gdb_stdtarg = gdb_stderr;     /* for moment */
 195
 196   /* initialize error() */
 197   error_init ();
 198
 199   /* Parse arguments and options.  */
 200   {
 201     int c;
 202     /* When var field is 0, use flag field to record the equivalent
 203        short option (or arbitrary numbers starting at 10 for those
 204        with no equivalent).  */
 205     static struct option long_options[] =
 206     {
 207       {"async", no_argument, &event_loop_p, 1},
 208       {"noasync", no_argument, &event_loop_p, 0},
 209 #if defined(TUI)
 210       {"tui", no_argument, &tui_version, 1},
 211 #endif
 212       {"xdb", no_argument, &xdb_commands, 1},
 213       {"dbx", no_argument, &dbx_commands, 1},
 214       {"readnow", no_argument, &readnow_symbol_files, 1},
 215       {"r", no_argument, &readnow_symbol_files, 1},
 216       {"mapped", no_argument, &mapped_symbol_files, 1},
 217       {"m", no_argument, &mapped_symbol_files, 1},
 218       {"quiet", no_argument, &quiet, 1},
 219       {"q", no_argument, &quiet, 1},
 220       {"silent", no_argument, &quiet, 1},
 221       {"nx", no_argument, &inhibit_gdbinit, 1},
 222       {"n", no_argument, &inhibit_gdbinit, 1},
 223       {"batch", no_argument, &batch, 1},
 224       {"epoch", no_argument, &epoch_interface, 1},
 225
 226     /* This is a synonym for "--annotate=1".  --annotate is now preferred,
 227        but keep this here for a long time because people will be running
 228        emacses which use --fullname.  */
 229       {"fullname", no_argument, 0, 'f'},
 230       {"f", no_argument, 0, 'f'},
 231
 232       {"annotate", required_argument, 0, 12},
 233       {"help", no_argument, &print_help, 1},
 234       {"se", required_argument, 0, 10},
 235       {"symbols", required_argument, 0, 's'},
 236       {"s", required_argument, 0, 's'},
 237       {"exec", required_argument, 0, 'e'},
 238       {"e", required_argument, 0, 'e'},
 239       {"core", required_argument, 0, 'c'},
 240       {"c", required_argument, 0, 'c'},
 241       {"pid", required_argument, 0, 'p'},
 242       {"p", required_argument, 0, 'p'},
 243       {"command", required_argument, 0, 'x'},
 244       {"version", no_argument, &print_version, 1},
 245       {"x", required_argument, 0, 'x'},
 246 #ifdef GDBTK
 247       {"tclcommand", required_argument, 0, 'z'},
 248       {"enable-external-editor", no_argument, 0, 'y'},
 249       {"editor-command", required_argument, 0, 'w'},
 250 #endif
 251       {"ui", required_argument, 0, 'i'},
 252       {"interpreter", required_argument, 0, 'i'},
 253       {"i", required_argument, 0, 'i'},
 254       {"directory", required_argument, 0, 'd'},
 255       {"d", required_argument, 0, 'd'},
 256       {"cd", required_argument, 0, 11},
 257       {"tty", required_argument, 0, 't'},
 258       {"baud", required_argument, 0, 'b'},
 259       {"b", required_argument, 0, 'b'},
 260       {"nw", no_argument, &use_windows, 0},
 261       {"nowindows", no_argument, &use_windows, 0},
 262       {"w", no_argument, &use_windows, 1},
 263       {"windows", no_argument, &use_windows, 1},
 264       {"statistics", no_argument, 0, 13},
 265       {"write", no_argument, &write_files, 1},
 266       {"args", no_argument, &set_args, 1},
 267 /* Allow machine descriptions to add more options... */
 268 #ifdef ADDITIONAL_OPTIONS
 269       ADDITIONAL_OPTIONS
 270 #endif
 271       {0, no_argument, 0, 0}
 272     };
 273
 274     while (1)
 275       {
 276         int option_index;
 277
 278         c = getopt_long_only (argc, argv, "",
 279                               long_options, &option_index);
 280         if (c == EOF || set_args)
 281           break;
 282
 283         /* Long option that takes an argument.  */
 284         if (c == 0 && long_options[option_index].flag == 0)
 285           c = long_options[option_index].val;
 286
 287         switch (c)
 288           {
 289           case 0:
 290             /* Long option that just sets a flag.  */
 291             break;
 292           case 10:
 293             symarg = optarg;
 294             execarg = optarg;
 295             break;
 296           case 11:
 297             cdarg = optarg;
 298             break;
 299           case 12:
 300             /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
 301             annotation_level = atoi (optarg);
 302             break;
 303           case 13:
 304             /* Enable the display of both time and space usage.  */
 305             display_time = 1;
 306             display_space = 1;
 307             break;
 308           case 'f':
 309             annotation_level = 1;
 310 /* We have probably been invoked from emacs.  Disable window interface.  */
 311             use_windows = 0;
 312             break;
 313           case 's':
 314             symarg = optarg;
 315             break;
 316           case 'e':
 317             execarg = optarg;
 318             break;
 319           case 'c':
 320             corearg = optarg;
 321             break;
 322           case 'p':
 323             /* "corearg" is shared by "--core" and "--pid" */
 324             corearg = optarg;
 325             break;
 326           case 'x':
 327             cmdarg[ncmd++] = optarg;
 328             if (ncmd >= cmdsize)
 329               {
 330                 cmdsize *= 2;
 331                 cmdarg = (char **) xrealloc ((char *) cmdarg,
 332                                              cmdsize * sizeof (*cmdarg));
 333               }
 334             break;
 335 #ifdef GDBTK
 336           case 'z':
 337             {
 338 extern int gdbtk_test (char *);
 339               if (!gdbtk_test (optarg))
 340                 {
 341                   fprintf_unfiltered (gdb_stderr, "%s: unable to load tclcommand file \"%s\"",
 342                                       argv[0], optarg);
 343                   exit (1);
 344                 }
 345               break;
 346             }
 347           case 'y':
 348             /* Backwards compatibility only.  */
 349             break;
 350           case 'w':
 351             {
 352               external_editor_command = xstrdup (optarg);
 353               break;
 354             }
 355 #endif /* GDBTK */
 356           case 'i':
 357             interpreter_p = optarg;
 358             break;
 359           case 'd':
 360             dirarg[ndir++] = optarg;
 361             if (ndir >= dirsize)
 362               {
 363                 dirsize *= 2;
 364                 dirarg = (char **) xrealloc ((char *) dirarg,
 365                                              dirsize * sizeof (*dirarg));
 366               }
 367             break;
 368           case 't':
 369             ttyarg = optarg;
 370             break;
 371           case 'q':
 372             quiet = 1;
 373             break;
 374           case 'b':
 375             {
 376               int i;
 377               char *p;
 378
 379               i = strtol (optarg, &p, 0);
 380               if (i == 0 && p == optarg)
 381
 382                 /* Don't use *_filtered or warning() (which relies on
 383                    current_target) until after initialize_all_files(). */
 384
 385                 fprintf_unfiltered
 386                   (gdb_stderr,
 387                    "warning: could not set baud rate to `%s'.\n", optarg);
 388               else
 389                 baud_rate = i;
 390             }
 391           case 'l':
 392             {
 393               int i;
 394               char *p;
 395
 396               i = strtol (optarg, &p, 0);
 397               if (i == 0 && p == optarg)
 398
 399                 /* Don't use *_filtered or warning() (which relies on
 400                    current_target) until after initialize_all_files(). */
 401
 402                 fprintf_unfiltered
 403                   (gdb_stderr,
 404                  "warning: could not set timeout limit to `%s'.\n", optarg);
 405               else
 406                 remote_timeout = i;
 407             }
 408             break;
 409
 410 #ifdef ADDITIONAL_OPTION_CASES
 411             ADDITIONAL_OPTION_CASES
 412 #endif
 413           case '?':
 414             fprintf_unfiltered (gdb_stderr,
 415                         "Use `%s --help' for a complete list of options.\n",
 416                                 argv[0]);
 417             exit (1);
 418           }
 419       }
 420
 421     /* If --help or --version, disable window interface.  */
 422     if (print_help || print_version)
 423       {
 424         use_windows = 0;
 425 #ifdef TUI
 426         /* Disable the TUI as well.  */
 427         tui_version = 0;
 428 #endif
 429       }
 430
 431 #ifdef TUI
 432     /* An explicit --tui flag overrides the default UI, which is the
 433        window system.  */
 434     if (tui_version)
 435       use_windows = 0;
 436 #endif
 437
 438     if (set_args)
 439       {
 440         /* The remaining options are the command-line options for the
 441            inferior.  The first one is the sym/exec file, and the rest
 442            are arguments.  */
 443         if (optind >= argc)
 444           {
 445             fprintf_unfiltered (gdb_stderr,
 446                                 "%s: `--args' specified but no program specified\n",
 447                                 argv[0]);
 448             exit (1);
 449           }
 450         symarg = argv[optind];
 451         execarg = argv[optind];
 452         ++optind;
 453         set_inferior_args_vector (argc - optind, &argv[optind]);
 454       }
 455     else
 456       {
 457         /* OK, that's all the options.  The other arguments are filenames.  */
 458         count = 0;
 459         for (; optind < argc; optind++)
 460           switch (++count)
 461             {
 462             case 1:
 463               symarg = argv[optind];
 464               execarg = argv[optind];
 465               break;
 466             case 2:
 467               /* The documentation says this can be a "ProcID" as well.
 468                  We will try it as both a corefile and a pid.  */
 469               corearg = argv[optind];
 470               break;
 471             case 3:
 472               fprintf_unfiltered (gdb_stderr,
 473                                   "Excess command line arguments ignored. (%s%s)\n",
 474                                   argv[optind], (optind == argc - 1) ? "" : " ...");
 475               break;
 476             }
 477       }
 478     if (batch)
 479       quiet = 1;
 480   }
 481
 482   /* Initialize all files.  Give the interpreter a chance to take
 483      control of the console via the init_ui_hook()) */
 484   gdb_init (argv[0]);
 485
 486   /* Do these (and anything which might call wrap_here or *_filtered)
 487      after initialize_all_files.  */
 488   if (print_version)
 489     {
 490       print_gdb_version (gdb_stdout);
 491       wrap_here ("");
 492       printf_filtered ("\n");
 493       exit (0);
 494     }
 495
 496   if (print_help)
 497     {
 498       print_gdb_help (gdb_stdout);
 499       fputs_unfiltered ("\n", gdb_stdout);
 500       exit (0);
 501     }
 502
 503   if (!quiet)
 504     {
 505       /* Print all the junk at the top, with trailing "..." if we are about
 506          to read a symbol file (possibly slowly).  */
 507       print_gdb_version (gdb_stdout);
 508       if (symarg)
 509         printf_filtered ("..");
 510       wrap_here ("");
 511       gdb_flush (gdb_stdout);   /* Force to screen during slow operations */
 512     }
 513
 514   error_pre_print = "\n\n";
 515   quit_pre_print = error_pre_print;
 516
 517   /* We may get more than one warning, don't double space all of them... */
 518   warning_pre_print = "\nwarning: ";
 519
 520   /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
 521      *before* all the command line arguments are processed; it sets
 522      global parameters, which are independent of what file you are
 523      debugging or what directory you are in.  */
 524   homedir = getenv ("HOME");
 525   if (homedir)
 526     {
 527       homeinit = (char *) alloca (strlen (homedir) +
 528                                   strlen (gdbinit) + 10);
 529       strcpy (homeinit, homedir);
 530       strcat (homeinit, "/");
 531       strcat (homeinit, gdbinit);
 532
 533       if (!inhibit_gdbinit)
 534         {
 535           catch_command_errors (source_command, homeinit, 0, RETURN_MASK_ALL);
 536         }
 537
 538       /* Do stats; no need to do them elsewhere since we'll only
 539          need them if homedir is set.  Make sure that they are
 540          zero in case one of them fails (this guarantees that they
 541          won't match if either exists).  */
 542
 543       memset (&homebuf, 0, sizeof (struct stat));
 544       memset (&cwdbuf, 0, sizeof (struct stat));
 545
 546       stat (homeinit, &homebuf);
 547       stat (gdbinit, &cwdbuf);  /* We'll only need this if
 548                                    homedir was set.  */
 549     }
 550
 551   /* Now perform all the actions indicated by the arguments.  */
 552   if (cdarg != NULL)
 553     {
 554       catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
 555     }
 556
 557   for (i = 0; i < ndir; i++)
 558     catch_command_errors (directory_command, dirarg[i], 0, RETURN_MASK_ALL);
 559   xfree (dirarg);
 560
 561   if (execarg != NULL
 562       && symarg != NULL
 563       && STREQ (execarg, symarg))
 564     {
 565       /* The exec file and the symbol-file are the same.  If we can't
 566          open it, better only print one error message.
 567          catch_command_errors returns non-zero on success! */
 568       if (catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL))
 569         catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
 570     }
 571   else
 572     {
 573       if (execarg != NULL)
 574         catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL);
 575       if (symarg != NULL)
 576         catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
 577     }
 578
 579   /* After the symbol file has been read, print a newline to get us
 580      beyond the copyright line...  But errors should still set off
 581      the error message with a (single) blank line.  */
 582   if (!quiet)
 583     printf_filtered ("\n");
 584   error_pre_print = "\n";
 585   quit_pre_print = error_pre_print;
 586   warning_pre_print = "\nwarning: ";
 587
 588   if (corearg != NULL)
 589     {
 590       /* corearg may be either a corefile or a pid.
 591          If its first character is a digit, try attach first
 592          and then corefile.  Otherwise try corefile first. */
 593
 594       if (isdigit (corearg[0]))
 595         {
 596           if (catch_command_errors (attach_command, corearg,
 597                                     !batch, RETURN_MASK_ALL) == 0)
 598             catch_command_errors (core_file_command, corearg,
 599                                   !batch, RETURN_MASK_ALL);
 600         }
 601       else /* Can't be a pid, better be a corefile. */
 602         catch_command_errors (core_file_command, corearg,
 603                               !batch, RETURN_MASK_ALL);
 604     }
 605
 606   if (ttyarg != NULL)
 607     catch_command_errors (tty_command, ttyarg, !batch, RETURN_MASK_ALL);
 608
 609 #ifdef ADDITIONAL_OPTION_HANDLER
 610   ADDITIONAL_OPTION_HANDLER;
 611 #endif
 612
 613   /* Error messages should no longer be distinguished with extra output. */
 614   error_pre_print = NULL;
 615   quit_pre_print = NULL;
 616   warning_pre_print = "warning: ";
 617
 618   /* Read the .gdbinit file in the current directory, *if* it isn't
 619      the same as the $HOME/.gdbinit file (it should exist, also).  */
 620
 621   if (!homedir
 622       || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
 623     if (!inhibit_gdbinit)
 624       {
 625         catch_command_errors (source_command, gdbinit, 0, RETURN_MASK_ALL);
 626       }
 627
 628   for (i = 0; i < ncmd; i++)
 629     {
 630 #if 0
 631       /* NOTE: cagney/1999-11-03: SET_TOP_LEVEL() was a macro that
 632          expanded into a call to setjmp().  */
 633       if (!SET_TOP_LEVEL ()) /* NB: This is #if 0'd out */
 634         {
 635           /* NOTE: I am commenting this out, because it is not clear
 636              where this feature is used. It is very old and
 637              undocumented. ezannoni: 1999-05-04 */
 638 #if 0
 639           if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
 640             read_command_file (stdin);
 641           else
 642 #endif
 643             source_command (cmdarg[i], !batch);
 644           do_cleanups (ALL_CLEANUPS);
 645         }
 646 #endif
 647       catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
 648     }
 649   xfree (cmdarg);
 650
 651   /* Read in the old history after all the command files have been read. */
 652   init_history ();
 653
 654   if (batch)
 655     {
 656       /* We have hit the end of the batch file.  */
 657       exit (0);
 658     }
 659
 660   /* Do any host- or target-specific hacks.  This is used for i960 targets
 661      to force the user to set a nindy target and spec its parameters.  */
 662
 663 #ifdef BEFORE_MAIN_LOOP_HOOK
 664   BEFORE_MAIN_LOOP_HOOK;
 665 #endif
 666
 667   END_PROGRESS (argv[0]);
 668
 669   /* Show time and/or space usage.  */
 670
 671   if (display_time)
 672     {
 673       long init_time = get_run_time () - time_at_startup;
 674
 675       printf_unfiltered ("Startup time: %ld.%06ld\n",
 676                          init_time / 1000000, init_time % 1000000);
 677     }
 678
 679   if (display_space)
 680     {
 681 #ifdef HAVE_SBRK
 682       extern char **environ;
 683       char *lim = (char *) sbrk (0);
 684
 685       printf_unfiltered ("Startup size: data size %ld\n",
 686                          (long) (lim - (char *) &environ));
 687 #endif
 688     }
 689
 690 #if 0
 691   /* FIXME: cagney/1999-11-06: The original main loop was like: */
 692   while (1)
 693     {
 694       if (!SET_TOP_LEVEL ())
 695         {
 696           do_cleanups (ALL_CLEANUPS);   /* Do complete cleanup */
 697           /* GUIs generally have their own command loop, mainloop, or whatever.
 698              This is a good place to gain control because many error
 699              conditions will end up here via longjmp(). */
 700           if (command_loop_hook)
 701             command_loop_hook ();
 702           else
 703             command_loop ();
 704           quit_command ((char *) 0, instream == stdin);
 705         }
 706     }
 707   /* NOTE: If the command_loop() returned normally, the loop would
 708      attempt to exit by calling the function quit_command().  That
 709      function would either call exit() or throw an error returning
 710      control to SET_TOP_LEVEL. */
 711   /* NOTE: The function do_cleanups() was called once each time round
 712      the loop.  The usefulness of the call isn't clear.  If an error
 713      was thrown, everything would have already been cleaned up.  If
 714      command_loop() returned normally and quit_command() was called,
 715      either exit() or error() (again cleaning up) would be called. */
 716 #endif
 717   /* NOTE: cagney/1999-11-07: There is probably no reason for not
 718      moving this loop and the code found in captured_command_loop()
 719      into the command_loop() proper.  The main thing holding back that
 720      change - SET_TOP_LEVEL() - has been eliminated. */
 721   while (1)
 722     {
 723       catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
 724     }
 725   /* No exit -- exit is through quit_command.  */
 726 }
 727
 728 int
 729 main (int argc, char **argv)
 730 {
 731   struct captured_main_args args;
 732   args.argc = argc;
 733   args.argv = argv;
 734   catch_errors (captured_main, &args, "", RETURN_MASK_ALL);
 735   return 0;
 736 }
 737
 738
 739 /* Don't use *_filtered for printing help.  We don't want to prompt
 740    for continue no matter how small the screen or how much we're going
 741    to print.  */
 742
 743 static void
 744 print_gdb_help (struct ui_file *stream)
 745 {
 746   fputs_unfiltered ("\
 747 This is the GNU debugger.  Usage:\n\n\
 748     gdb [options] [executable-file [core-file or process-id]]\n\
 749     gdb [options] --args executable-file [inferior-arguments ...]\n\n\
 750 Options:\n\n\
 751 ", stream);
 752   fputs_unfiltered ("\
 753   --args             Arguments after executable-file are passed to inferior\n\
 754 ", stream);
 755   fputs_unfiltered ("\
 756   --[no]async        Enable (disable) asynchronous version of CLI\n\
 757 ", stream);
 758   fputs_unfiltered ("\
 759   -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
 760   --batch            Exit after processing options.\n\
 761   --cd=DIR           Change current directory to DIR.\n\
 762   --command=FILE     Execute GDB commands from FILE.\n\
 763   --core=COREFILE    Analyze the core dump COREFILE.\n\
 764   --pid=PID          Attach to running process PID.\n\
 765 ", stream);
 766   fputs_unfiltered ("\
 767   --dbx              DBX compatibility mode.\n\
 768   --directory=DIR    Search for source files in DIR.\n\
 769   --epoch            Output information used by epoch emacs-GDB interface.\n\
 770   --exec=EXECFILE    Use EXECFILE as the executable.\n\
 771   --fullname         Output information used by emacs-GDB interface.\n\
 772   --help             Print this message.\n\
 773 ", stream);
 774   fputs_unfiltered ("\
 775   --interpreter=INTERP\n\
 776                      Select a specific interpreter / user interface\n\
 777 ", stream);
 778   fputs_unfiltered ("\
 779   --mapped           Use mapped symbol files if supported on this system.\n\
 780   --nw               Do not use a window interface.\n\
 781   --nx               Do not read ", stream);
 782   fputs_unfiltered (gdbinit, stream);
 783   fputs_unfiltered (" file.\n\
 784   --quiet            Do not print version number on startup.\n\
 785   --readnow          Fully read symbol files on first access.\n\
 786 ", stream);
 787   fputs_unfiltered ("\
 788   --se=FILE          Use FILE as symbol file and executable file.\n\
 789   --symbols=SYMFILE  Read symbols from SYMFILE.\n\
 790   --tty=TTY          Use TTY for input/output by the program being debugged.\n\
 791 ", stream);
 792 #if defined(TUI)
 793   fputs_unfiltered ("\
 794   --tui              Use a terminal user interface.\n\
 795 ", stream);
 796 #endif
 797   fputs_unfiltered ("\
 798   --version          Print version information and then exit.\n\
 799   -w                 Use a window interface.\n\
 800   --write            Set writing into executable and core files.\n\
 801   --xdb              XDB compatibility mode.\n\
 802 ", stream);
 803 #ifdef ADDITIONAL_OPTION_HELP
 804   fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
 805 #endif
 806   fputs_unfiltered ("\n\
 807 For more information, type \"help\" from within GDB, or consult the\n\
 808 GDB manual (available as on-line info or a printed manual).\n\
 809 Report bugs to \"bug-gdb@gnu.org\".\
 810 ", stream);
 811 }