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 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 161   setlocale (LC_MESSAGES, "");
 162 #endif
 163 #if defined (HAVE_SETLOCALE)
 164   setlocale (LC_CTYPE, "");
 165 #endif
 166   bindtextdomain (PACKAGE, LOCALEDIR);
 167   textdomain (PACKAGE);
 168
 169   START_PROGRESS (argv[0], 0);
 170
 171 #ifdef MPW
 172   /* Do all Mac-specific setup. */
 173   mac_init ();
 174 #endif /* MPW */
 175
 176   /* This needs to happen before the first use of malloc.  */
 177   init_malloc ((PTR) NULL);
 178
 179 #if defined (ALIGN_STACK_ON_STARTUP)
 180   i = (int) &count & 0x3;
 181   if (i != 0)
 182     alloca (4 - i);
 183 #endif
 184
 185   cmdsize = 1;
 186   cmdarg = (char **) xmalloc (cmdsize * sizeof (*cmdarg));
 187   ncmd = 0;
 188   dirsize = 1;
 189   dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
 190   ndir = 0;
 191
 192   quit_flag = 0;
 193   line = (char *) xmalloc (linesize);
 194   line[0] = '\0';               /* Terminate saved (now empty) cmd line */
 195   instream = stdin;
 196
 197   getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
 198   current_directory = gdb_dirbuf;
 199
 200   gdb_stdout = stdio_fileopen (stdout);
 201   gdb_stderr = stdio_fileopen (stderr);
 202   gdb_stdlog = gdb_stderr;      /* for moment */
 203   gdb_stdtarg = gdb_stderr;     /* for moment */
 204
 205   /* initialize error() */
 206   error_init ();
 207
 208   /* Parse arguments and options.  */
 209   {
 210     int c;
 211     /* When var field is 0, use flag field to record the equivalent
 212        short option (or arbitrary numbers starting at 10 for those
 213        with no equivalent).  */
 214     static struct option long_options[] =
 215     {
 216       {"async", no_argument, &event_loop_p, 1},
 217       {"noasync", no_argument, &event_loop_p, 0},
 218 #if defined(TUI)
 219       {"tui", no_argument, &tui_version, 1},
 220 #endif
 221       {"xdb", no_argument, &xdb_commands, 1},
 222       {"dbx", no_argument, &dbx_commands, 1},
 223       {"readnow", no_argument, &readnow_symbol_files, 1},
 224       {"r", no_argument, &readnow_symbol_files, 1},
 225       {"mapped", no_argument, &mapped_symbol_files, 1},
 226       {"m", no_argument, &mapped_symbol_files, 1},
 227       {"quiet", no_argument, &quiet, 1},
 228       {"q", no_argument, &quiet, 1},
 229       {"silent", no_argument, &quiet, 1},
 230       {"nx", no_argument, &inhibit_gdbinit, 1},
 231       {"n", no_argument, &inhibit_gdbinit, 1},
 232       {"batch", no_argument, &batch, 1},
 233       {"epoch", no_argument, &epoch_interface, 1},
 234
 235     /* This is a synonym for "--annotate=1".  --annotate is now preferred,
 236        but keep this here for a long time because people will be running
 237        emacses which use --fullname.  */
 238       {"fullname", no_argument, 0, 'f'},
 239       {"f", no_argument, 0, 'f'},
 240
 241       {"annotate", required_argument, 0, 12},
 242       {"help", no_argument, &print_help, 1},
 243       {"se", required_argument, 0, 10},
 244       {"symbols", required_argument, 0, 's'},
 245       {"s", required_argument, 0, 's'},
 246       {"exec", required_argument, 0, 'e'},
 247       {"e", required_argument, 0, 'e'},
 248       {"core", required_argument, 0, 'c'},
 249       {"c", required_argument, 0, 'c'},
 250       {"pid", required_argument, 0, 'p'},
 251       {"p", required_argument, 0, 'p'},
 252       {"command", required_argument, 0, 'x'},
 253       {"version", no_argument, &print_version, 1},
 254       {"x", required_argument, 0, 'x'},
 255 #ifdef GDBTK
 256       {"tclcommand", required_argument, 0, 'z'},
 257       {"enable-external-editor", no_argument, 0, 'y'},
 258       {"editor-command", required_argument, 0, 'w'},
 259 #endif
 260       {"ui", required_argument, 0, 'i'},
 261       {"interpreter", required_argument, 0, 'i'},
 262       {"i", required_argument, 0, 'i'},
 263       {"directory", required_argument, 0, 'd'},
 264       {"d", required_argument, 0, 'd'},
 265       {"cd", required_argument, 0, 11},
 266       {"tty", required_argument, 0, 't'},
 267       {"baud", required_argument, 0, 'b'},
 268       {"b", required_argument, 0, 'b'},
 269       {"nw", no_argument, &use_windows, 0},
 270       {"nowindows", no_argument, &use_windows, 0},
 271       {"w", no_argument, &use_windows, 1},
 272       {"windows", no_argument, &use_windows, 1},
 273       {"statistics", no_argument, 0, 13},
 274       {"write", no_argument, &write_files, 1},
 275       {"args", no_argument, &set_args, 1},
 276 /* Allow machine descriptions to add more options... */
 277 #ifdef ADDITIONAL_OPTIONS
 278       ADDITIONAL_OPTIONS
 279 #endif
 280       {0, no_argument, 0, 0}
 281     };
 282
 283     while (1)
 284       {
 285         int option_index;
 286
 287         c = getopt_long_only (argc, argv, "",
 288                               long_options, &option_index);
 289         if (c == EOF || set_args)
 290           break;
 291
 292         /* Long option that takes an argument.  */
 293         if (c == 0 && long_options[option_index].flag == 0)
 294           c = long_options[option_index].val;
 295
 296         switch (c)
 297           {
 298           case 0:
 299             /* Long option that just sets a flag.  */
 300             break;
 301           case 10:
 302             symarg = optarg;
 303             execarg = optarg;
 304             break;
 305           case 11:
 306             cdarg = optarg;
 307             break;
 308           case 12:
 309             /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
 310             annotation_level = atoi (optarg);
 311             break;
 312           case 13:
 313             /* Enable the display of both time and space usage.  */
 314             display_time = 1;
 315             display_space = 1;
 316             break;
 317           case 'f':
 318             annotation_level = 1;
 319 /* We have probably been invoked from emacs.  Disable window interface.  */
 320             use_windows = 0;
 321             break;
 322           case 's':
 323             symarg = optarg;
 324             break;
 325           case 'e':
 326             execarg = optarg;
 327             break;
 328           case 'c':
 329             corearg = optarg;
 330             break;
 331           case 'p':
 332             /* "corearg" is shared by "--core" and "--pid" */
 333             corearg = optarg;
 334             break;
 335           case 'x':
 336             cmdarg[ncmd++] = optarg;
 337             if (ncmd >= cmdsize)
 338               {
 339                 cmdsize *= 2;
 340                 cmdarg = (char **) xrealloc ((char *) cmdarg,
 341                                              cmdsize * sizeof (*cmdarg));
 342               }
 343             break;
 344 #ifdef GDBTK
 345           case 'z':
 346             {
 347 extern int gdbtk_test (char *);
 348               if (!gdbtk_test (optarg))
 349                 {
 350                   fprintf_unfiltered (gdb_stderr, _("%s: unable to load tclcommand file \"%s\""),
 351                                       argv[0], optarg);
 352                   exit (1);
 353                 }
 354               break;
 355             }
 356           case 'y':
 357             /* Backwards compatibility only.  */
 358             break;
 359           case 'w':
 360             {
 361               external_editor_command = xstrdup (optarg);
 362               break;
 363             }
 364 #endif /* GDBTK */
 365           case 'i':
 366             interpreter_p = optarg;
 367             break;
 368           case 'd':
 369             dirarg[ndir++] = optarg;
 370             if (ndir >= dirsize)
 371               {
 372                 dirsize *= 2;
 373                 dirarg = (char **) xrealloc ((char *) dirarg,
 374                                              dirsize * sizeof (*dirarg));
 375               }
 376             break;
 377           case 't':
 378             ttyarg = optarg;
 379             break;
 380           case 'q':
 381             quiet = 1;
 382             break;
 383           case 'b':
 384             {
 385               int i;
 386               char *p;
 387
 388               i = strtol (optarg, &p, 0);
 389               if (i == 0 && p == optarg)
 390
 391                 /* Don't use *_filtered or warning() (which relies on
 392                    current_target) until after initialize_all_files(). */
 393
 394                 fprintf_unfiltered
 395                   (gdb_stderr,
 396                    _("warning: could not set baud rate to `%s'.\n"), optarg);
 397               else
 398                 baud_rate = i;
 399             }
 400             break;
 401           case 'l':
 402             {
 403               int i;
 404               char *p;
 405
 406               i = strtol (optarg, &p, 0);
 407               if (i == 0 && p == optarg)
 408
 409                 /* Don't use *_filtered or warning() (which relies on
 410                    current_target) until after initialize_all_files(). */
 411
 412                 fprintf_unfiltered
 413                   (gdb_stderr,
 414                  _("warning: could not set timeout limit to `%s'.\n"), optarg);
 415               else
 416                 remote_timeout = i;
 417             }
 418             break;
 419
 420 #ifdef ADDITIONAL_OPTION_CASES
 421             ADDITIONAL_OPTION_CASES
 422 #endif
 423           case '?':
 424             fprintf_unfiltered (gdb_stderr,
 425                         _("Use `%s --help' for a complete list of options.\n"),
 426                                 argv[0]);
 427             exit (1);
 428           }
 429       }
 430
 431     /* If --help or --version, disable window interface.  */
 432     if (print_help || print_version)
 433       {
 434         use_windows = 0;
 435 #ifdef TUI
 436         /* Disable the TUI as well.  */
 437         tui_version = 0;
 438 #endif
 439       }
 440
 441 #ifdef TUI
 442     /* An explicit --tui flag overrides the default UI, which is the
 443        window system.  */
 444     if (tui_version)
 445       use_windows = 0;
 446 #endif
 447
 448     if (set_args)
 449       {
 450         /* The remaining options are the command-line options for the
 451            inferior.  The first one is the sym/exec file, and the rest
 452            are arguments.  */
 453         if (optind >= argc)
 454           {
 455             fprintf_unfiltered (gdb_stderr,
 456                                 _("%s: `--args' specified but no program specified\n"),
 457                                 argv[0]);
 458             exit (1);
 459           }
 460         symarg = argv[optind];
 461         execarg = argv[optind];
 462         ++optind;
 463         set_inferior_args_vector (argc - optind, &argv[optind]);
 464       }
 465     else
 466       {
 467         /* OK, that's all the options.  The other arguments are filenames.  */
 468         count = 0;
 469         for (; optind < argc; optind++)
 470           switch (++count)
 471             {
 472             case 1:
 473               symarg = argv[optind];
 474               execarg = argv[optind];
 475               break;
 476             case 2:
 477               /* The documentation says this can be a "ProcID" as well.
 478                  We will try it as both a corefile and a pid.  */
 479               corearg = argv[optind];
 480               break;
 481             case 3:
 482               fprintf_unfiltered (gdb_stderr,
 483                                   _("Excess command line arguments ignored. (%s%s)\n"),
 484                                   argv[optind], (optind == argc - 1) ? "" : " ...");
 485               break;
 486             }
 487       }
 488     if (batch)
 489       quiet = 1;
 490   }
 491
 492   /* Initialize all files.  Give the interpreter a chance to take
 493      control of the console via the init_ui_hook()) */
 494   gdb_init (argv[0]);
 495
 496   /* Do these (and anything which might call wrap_here or *_filtered)
 497      after initialize_all_files.  */
 498   if (print_version)
 499     {
 500       print_gdb_version (gdb_stdout);
 501       wrap_here ("");
 502       printf_filtered ("\n");
 503       exit (0);
 504     }
 505
 506   if (print_help)
 507     {
 508       print_gdb_help (gdb_stdout);
 509       fputs_unfiltered ("\n", gdb_stdout);
 510       exit (0);
 511     }
 512
 513   if (!quiet)
 514     {
 515       /* Print all the junk at the top, with trailing "..." if we are about
 516          to read a symbol file (possibly slowly).  */
 517       print_gdb_version (gdb_stdout);
 518       if (symarg)
 519         printf_filtered ("..");
 520       wrap_here ("");
 521       gdb_flush (gdb_stdout);   /* Force to screen during slow operations */
 522     }
 523
 524   error_pre_print = "\n\n";
 525   quit_pre_print = error_pre_print;
 526
 527   /* We may get more than one warning, don't double space all of them... */
 528   warning_pre_print = _("\nwarning: ");
 529
 530   /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
 531      *before* all the command line arguments are processed; it sets
 532      global parameters, which are independent of what file you are
 533      debugging or what directory you are in.  */
 534   homedir = getenv ("HOME");
 535   if (homedir)
 536     {
 537       homeinit = (char *) alloca (strlen (homedir) +
 538                                   strlen (gdbinit) + 10);
 539       strcpy (homeinit, homedir);
 540       strcat (homeinit, "/");
 541       strcat (homeinit, gdbinit);
 542
 543       if (!inhibit_gdbinit)
 544         {
 545           catch_command_errors (source_command, homeinit, 0, RETURN_MASK_ALL);
 546         }
 547
 548       /* Do stats; no need to do them elsewhere since we'll only
 549          need them if homedir is set.  Make sure that they are
 550          zero in case one of them fails (this guarantees that they
 551          won't match if either exists).  */
 552
 553       memset (&homebuf, 0, sizeof (struct stat));
 554       memset (&cwdbuf, 0, sizeof (struct stat));
 555
 556       stat (homeinit, &homebuf);
 557       stat (gdbinit, &cwdbuf);  /* We'll only need this if
 558                                    homedir was set.  */
 559     }
 560
 561   /* Now perform all the actions indicated by the arguments.  */
 562   if (cdarg != NULL)
 563     {
 564       catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
 565     }
 566
 567   for (i = 0; i < ndir; i++)
 568     catch_command_errors (directory_command, dirarg[i], 0, RETURN_MASK_ALL);
 569   xfree (dirarg);
 570
 571   if (execarg != NULL
 572       && symarg != NULL
 573       && STREQ (execarg, symarg))
 574     {
 575       /* The exec file and the symbol-file are the same.  If we can't
 576          open it, better only print one error message.
 577          catch_command_errors returns non-zero on success! */
 578       if (catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL))
 579         catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
 580     }
 581   else
 582     {
 583       if (execarg != NULL)
 584         catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL);
 585       if (symarg != NULL)
 586         catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
 587     }
 588
 589   /* After the symbol file has been read, print a newline to get us
 590      beyond the copyright line...  But errors should still set off
 591      the error message with a (single) blank line.  */
 592   if (!quiet)
 593     printf_filtered ("\n");
 594   error_pre_print = "\n";
 595   quit_pre_print = error_pre_print;
 596   warning_pre_print = _("\nwarning: ");
 597
 598   if (corearg != NULL)
 599     {
 600       /* corearg may be either a corefile or a pid.
 601          If its first character is a digit, try attach first
 602          and then corefile.  Otherwise try corefile first. */
 603
 604       if (isdigit (corearg[0]))
 605         {
 606           if (catch_command_errors (attach_command, corearg,
 607                                     !batch, RETURN_MASK_ALL) == 0)
 608             catch_command_errors (core_file_command, corearg,
 609                                   !batch, RETURN_MASK_ALL);
 610         }
 611       else /* Can't be a pid, better be a corefile. */
 612         catch_command_errors (core_file_command, corearg,
 613                               !batch, RETURN_MASK_ALL);
 614     }
 615
 616   if (ttyarg != NULL)
 617     catch_command_errors (tty_command, ttyarg, !batch, RETURN_MASK_ALL);
 618
 619 #ifdef ADDITIONAL_OPTION_HANDLER
 620   ADDITIONAL_OPTION_HANDLER;
 621 #endif
 622
 623   /* Error messages should no longer be distinguished with extra output. */
 624   error_pre_print = NULL;
 625   quit_pre_print = NULL;
 626   warning_pre_print = _("warning: ");
 627
 628   /* Read the .gdbinit file in the current directory, *if* it isn't
 629      the same as the $HOME/.gdbinit file (it should exist, also).  */
 630
 631   if (!homedir
 632       || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
 633     if (!inhibit_gdbinit)
 634       {
 635         catch_command_errors (source_command, gdbinit, 0, RETURN_MASK_ALL);
 636       }
 637
 638   for (i = 0; i < ncmd; i++)
 639     {
 640 #if 0
 641       /* NOTE: cagney/1999-11-03: SET_TOP_LEVEL() was a macro that
 642          expanded into a call to setjmp().  */
 643       if (!SET_TOP_LEVEL ()) /* NB: This is #if 0'd out */
 644         {
 645           /* NOTE: I am commenting this out, because it is not clear
 646              where this feature is used. It is very old and
 647              undocumented. ezannoni: 1999-05-04 */
 648 #if 0
 649           if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
 650             read_command_file (stdin);
 651           else
 652 #endif
 653             source_command (cmdarg[i], !batch);
 654           do_cleanups (ALL_CLEANUPS);
 655         }
 656 #endif
 657       catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
 658     }
 659   xfree (cmdarg);
 660
 661   /* Read in the old history after all the command files have been read. */
 662   init_history ();
 663
 664   if (batch)
 665     {
 666       /* We have hit the end of the batch file.  */
 667       exit (0);
 668     }
 669
 670   /* Do any host- or target-specific hacks.  This is used for i960 targets
 671      to force the user to set a nindy target and spec its parameters.  */
 672
 673 #ifdef BEFORE_MAIN_LOOP_HOOK
 674   BEFORE_MAIN_LOOP_HOOK;
 675 #endif
 676
 677   END_PROGRESS (argv[0]);
 678
 679   /* Show time and/or space usage.  */
 680
 681   if (display_time)
 682     {
 683       long init_time = get_run_time () - time_at_startup;
 684
 685       printf_unfiltered (_("Startup time: %ld.%06ld\n"),
 686                          init_time / 1000000, init_time % 1000000);
 687     }
 688
 689   if (display_space)
 690     {
 691 #ifdef HAVE_SBRK
 692       extern char **environ;
 693       char *lim = (char *) sbrk (0);
 694
 695       printf_unfiltered (_("Startup size: data size %ld\n"),
 696                          (long) (lim - (char *) &environ));
 697 #endif
 698     }
 699
 700 #if 0
 701   /* FIXME: cagney/1999-11-06: The original main loop was like: */
 702   while (1)
 703     {
 704       if (!SET_TOP_LEVEL ())
 705         {
 706           do_cleanups (ALL_CLEANUPS);   /* Do complete cleanup */
 707           /* GUIs generally have their own command loop, mainloop, or whatever.
 708              This is a good place to gain control because many error
 709              conditions will end up here via longjmp(). */
 710           if (command_loop_hook)
 711             command_loop_hook ();
 712           else
 713             command_loop ();
 714           quit_command ((char *) 0, instream == stdin);
 715         }
 716     }
 717   /* NOTE: If the command_loop() returned normally, the loop would
 718      attempt to exit by calling the function quit_command().  That
 719      function would either call exit() or throw an error returning
 720      control to SET_TOP_LEVEL. */
 721   /* NOTE: The function do_cleanups() was called once each time round
 722      the loop.  The usefulness of the call isn't clear.  If an error
 723      was thrown, everything would have already been cleaned up.  If
 724      command_loop() returned normally and quit_command() was called,
 725      either exit() or error() (again cleaning up) would be called. */
 726 #endif
 727   /* NOTE: cagney/1999-11-07: There is probably no reason for not
 728      moving this loop and the code found in captured_command_loop()
 729      into the command_loop() proper.  The main thing holding back that
 730      change - SET_TOP_LEVEL() - has been eliminated. */
 731   while (1)
 732     {
 733       catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
 734     }
 735   /* No exit -- exit is through quit_command.  */
 736 }
 737
 738 int
 739 main (int argc, char **argv)
 740 {
 741   struct captured_main_args args;
 742   args.argc = argc;
 743   args.argv = argv;
 744   catch_errors (captured_main, &args, "", RETURN_MASK_ALL);
 745   return 0;
 746 }
 747
 748
 749 /* Don't use *_filtered for printing help.  We don't want to prompt
 750    for continue no matter how small the screen or how much we're going
 751    to print.  */
 752
 753 static void
 754 print_gdb_help (struct ui_file *stream)
 755 {
 756   fputs_unfiltered (_("\
 757 This is the GNU debugger.  Usage:\n\n\
 758     gdb [options] [executable-file [core-file or process-id]]\n\
 759     gdb [options] --args executable-file [inferior-arguments ...]\n\n\
 760 Options:\n\n\
 761 "), stream);
 762   fputs_unfiltered (_("\
 763   --args             Arguments after executable-file are passed to inferior\n\
 764 "), stream);
 765   fputs_unfiltered (_("\
 766   --[no]async        Enable (disable) asynchronous version of CLI\n\
 767 "), stream);
 768   fputs_unfiltered (_("\
 769   -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
 770   --batch            Exit after processing options.\n\
 771   --cd=DIR           Change current directory to DIR.\n\
 772   --command=FILE     Execute GDB commands from FILE.\n\
 773   --core=COREFILE    Analyze the core dump COREFILE.\n\
 774   --pid=PID          Attach to running process PID.\n\
 775 "), stream);
 776   fputs_unfiltered (_("\
 777   --dbx              DBX compatibility mode.\n\
 778   --directory=DIR    Search for source files in DIR.\n\
 779   --epoch            Output information used by epoch emacs-GDB interface.\n\
 780   --exec=EXECFILE    Use EXECFILE as the executable.\n\
 781   --fullname         Output information used by emacs-GDB interface.\n\
 782   --help             Print this message.\n\
 783 "), stream);
 784   fputs_unfiltered (_("\
 785   --interpreter=INTERP\n\
 786                      Select a specific interpreter / user interface\n\
 787 "), stream);
 788   fputs_unfiltered (_("\
 789   --mapped           Use mapped symbol files if supported on this system.\n\
 790   --nw               Do not use a window interface.\n\
 791   --nx               Do not read "), stream);
 792   fputs_unfiltered (gdbinit, stream);
 793   fputs_unfiltered (_(" file.\n\
 794   --quiet            Do not print version number on startup.\n\
 795   --readnow          Fully read symbol files on first access.\n\
 796 "), stream);
 797   fputs_unfiltered (_("\
 798   --se=FILE          Use FILE as symbol file and executable file.\n\
 799   --symbols=SYMFILE  Read symbols from SYMFILE.\n\
 800   --tty=TTY          Use TTY for input/output by the program being debugged.\n\
 801 "), stream);
 802 #if defined(TUI)
 803   fputs_unfiltered (_("\
 804   --tui              Use a terminal user interface.\n\
 805 "), stream);
 806 #endif
 807   fputs_unfiltered (_("\
 808   --version          Print version information and then exit.\n\
 809   -w                 Use a window interface.\n\
 810   --write            Set writing into executable and core files.\n\
 811   --xdb              XDB compatibility mode.\n\
 812 "), stream);
 813 #ifdef ADDITIONAL_OPTION_HELP
 814   fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
 815 #endif
 816   fputs_unfiltered (_("\n\
 817 For more information, type \"help\" from within GDB, or consult the\n\
 818 GDB manual (available as on-line info or a printed manual).\n\
 819 Report bugs to \"bug-gdb@gnu.org\".\
 820 "), stream);
 821 }