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           case 'l':
 401             {
 402               int i;
 403               char *p;
 404
 405               i = strtol (optarg, &p, 0);
 406               if (i == 0 && p == optarg)
 407
 408                 /* Don't use *_filtered or warning() (which relies on
 409                    current_target) until after initialize_all_files(). */
 410
 411                 fprintf_unfiltered
 412                   (gdb_stderr,
 413                  _("warning: could not set timeout limit to `%s'.\n"), optarg);
 414               else
 415                 remote_timeout = i;
 416             }
 417             break;
 418
 419 #ifdef ADDITIONAL_OPTION_CASES
 420             ADDITIONAL_OPTION_CASES
 421 #endif
 422           case '?':
 423             fprintf_unfiltered (gdb_stderr,
 424                         _("Use `%s --help' for a complete list of options.\n"),
 425                                 argv[0]);
 426             exit (1);
 427           }
 428       }
 429
 430     /* If --help or --version, disable window interface.  */
 431     if (print_help || print_version)
 432       {
 433         use_windows = 0;
 434 #ifdef TUI
 435         /* Disable the TUI as well.  */
 436         tui_version = 0;
 437 #endif
 438       }
 439
 440 #ifdef TUI
 441     /* An explicit --tui flag overrides the default UI, which is the
 442        window system.  */
 443     if (tui_version)
 444       use_windows = 0;
 445 #endif
 446
 447     if (set_args)
 448       {
 449         /* The remaining options are the command-line options for the
 450            inferior.  The first one is the sym/exec file, and the rest
 451            are arguments.  */
 452         if (optind >= argc)
 453           {
 454             fprintf_unfiltered (gdb_stderr,
 455                                 _("%s: `--args' specified but no program specified\n"),
 456                                 argv[0]);
 457             exit (1);
 458           }
 459         symarg = argv[optind];
 460         execarg = argv[optind];
 461         ++optind;
 462         set_inferior_args_vector (argc - optind, &argv[optind]);
 463       }
 464     else
 465       {
 466         /* OK, that's all the options.  The other arguments are filenames.  */
 467         count = 0;
 468         for (; optind < argc; optind++)
 469           switch (++count)
 470             {
 471             case 1:
 472               symarg = argv[optind];
 473               execarg = argv[optind];
 474               break;
 475             case 2:
 476               /* The documentation says this can be a "ProcID" as well.
 477                  We will try it as both a corefile and a pid.  */
 478               corearg = argv[optind];
 479               break;
 480             case 3:
 481               fprintf_unfiltered (gdb_stderr,
 482                                   _("Excess command line arguments ignored. (%s%s)\n"),
 483                                   argv[optind], (optind == argc - 1) ? "" : " ...");
 484               break;
 485             }
 486       }
 487     if (batch)
 488       quiet = 1;
 489   }
 490
 491   /* Initialize all files.  Give the interpreter a chance to take
 492      control of the console via the init_ui_hook()) */
 493   gdb_init (argv[0]);
 494
 495   /* Do these (and anything which might call wrap_here or *_filtered)
 496      after initialize_all_files.  */
 497   if (print_version)
 498     {
 499       print_gdb_version (gdb_stdout);
 500       wrap_here ("");
 501       printf_filtered ("\n");
 502       exit (0);
 503     }
 504
 505   if (print_help)
 506     {
 507       print_gdb_help (gdb_stdout);
 508       fputs_unfiltered ("\n", gdb_stdout);
 509       exit (0);
 510     }
 511
 512   if (!quiet)
 513     {
 514       /* Print all the junk at the top, with trailing "..." if we are about
 515          to read a symbol file (possibly slowly).  */
 516       print_gdb_version (gdb_stdout);
 517       if (symarg)
 518         printf_filtered ("..");
 519       wrap_here ("");
 520       gdb_flush (gdb_stdout);   /* Force to screen during slow operations */
 521     }
 522
 523   error_pre_print = "\n\n";
 524   quit_pre_print = error_pre_print;
 525
 526   /* We may get more than one warning, don't double space all of them... */
 527   warning_pre_print = _("\nwarning: ");
 528
 529   /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
 530      *before* all the command line arguments are processed; it sets
 531      global parameters, which are independent of what file you are
 532      debugging or what directory you are in.  */
 533   homedir = getenv ("HOME");
 534   if (homedir)
 535     {
 536       homeinit = (char *) alloca (strlen (homedir) +
 537                                   strlen (gdbinit) + 10);
 538       strcpy (homeinit, homedir);
 539       strcat (homeinit, "/");
 540       strcat (homeinit, gdbinit);
 541
 542       if (!inhibit_gdbinit)
 543         {
 544           catch_command_errors (source_command, homeinit, 0, RETURN_MASK_ALL);
 545         }
 546
 547       /* Do stats; no need to do them elsewhere since we'll only
 548          need them if homedir is set.  Make sure that they are
 549          zero in case one of them fails (this guarantees that they
 550          won't match if either exists).  */
 551
 552       memset (&homebuf, 0, sizeof (struct stat));
 553       memset (&cwdbuf, 0, sizeof (struct stat));
 554
 555       stat (homeinit, &homebuf);
 556       stat (gdbinit, &cwdbuf);  /* We'll only need this if
 557                                    homedir was set.  */
 558     }
 559
 560   /* Now perform all the actions indicated by the arguments.  */
 561   if (cdarg != NULL)
 562     {
 563       catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
 564     }
 565
 566   for (i = 0; i < ndir; i++)
 567     catch_command_errors (directory_command, dirarg[i], 0, RETURN_MASK_ALL);
 568   xfree (dirarg);
 569
 570   if (execarg != NULL
 571       && symarg != NULL
 572       && STREQ (execarg, symarg))
 573     {
 574       /* The exec file and the symbol-file are the same.  If we can't
 575          open it, better only print one error message.
 576          catch_command_errors returns non-zero on success! */
 577       if (catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL))
 578         catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
 579     }
 580   else
 581     {
 582       if (execarg != NULL)
 583         catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL);
 584       if (symarg != NULL)
 585         catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
 586     }
 587
 588   /* After the symbol file has been read, print a newline to get us
 589      beyond the copyright line...  But errors should still set off
 590      the error message with a (single) blank line.  */
 591   if (!quiet)
 592     printf_filtered ("\n");
 593   error_pre_print = "\n";
 594   quit_pre_print = error_pre_print;
 595   warning_pre_print = _("\nwarning: ");
 596
 597   if (corearg != NULL)
 598     {
 599       /* corearg may be either a corefile or a pid.
 600          If its first character is a digit, try attach first
 601          and then corefile.  Otherwise try corefile first. */
 602
 603       if (isdigit (corearg[0]))
 604         {
 605           if (catch_command_errors (attach_command, corearg,
 606                                     !batch, RETURN_MASK_ALL) == 0)
 607             catch_command_errors (core_file_command, corearg,
 608                                   !batch, RETURN_MASK_ALL);
 609         }
 610       else /* Can't be a pid, better be a corefile. */
 611         catch_command_errors (core_file_command, corearg,
 612                               !batch, RETURN_MASK_ALL);
 613     }
 614
 615   if (ttyarg != NULL)
 616     catch_command_errors (tty_command, ttyarg, !batch, RETURN_MASK_ALL);
 617
 618 #ifdef ADDITIONAL_OPTION_HANDLER
 619   ADDITIONAL_OPTION_HANDLER;
 620 #endif
 621
 622   /* Error messages should no longer be distinguished with extra output. */
 623   error_pre_print = NULL;
 624   quit_pre_print = NULL;
 625   warning_pre_print = _("warning: ");
 626
 627   /* Read the .gdbinit file in the current directory, *if* it isn't
 628      the same as the $HOME/.gdbinit file (it should exist, also).  */
 629
 630   if (!homedir
 631       || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
 632     if (!inhibit_gdbinit)
 633       {
 634         catch_command_errors (source_command, gdbinit, 0, RETURN_MASK_ALL);
 635       }
 636
 637   for (i = 0; i < ncmd; i++)
 638     {
 639 #if 0
 640       /* NOTE: cagney/1999-11-03: SET_TOP_LEVEL() was a macro that
 641          expanded into a call to setjmp().  */
 642       if (!SET_TOP_LEVEL ()) /* NB: This is #if 0'd out */
 643         {
 644           /* NOTE: I am commenting this out, because it is not clear
 645              where this feature is used. It is very old and
 646              undocumented. ezannoni: 1999-05-04 */
 647 #if 0
 648           if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
 649             read_command_file (stdin);
 650           else
 651 #endif
 652             source_command (cmdarg[i], !batch);
 653           do_cleanups (ALL_CLEANUPS);
 654         }
 655 #endif
 656       catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
 657     }
 658   xfree (cmdarg);
 659
 660   /* Read in the old history after all the command files have been read. */
 661   init_history ();
 662
 663   if (batch)
 664     {
 665       /* We have hit the end of the batch file.  */
 666       exit (0);
 667     }
 668
 669   /* Do any host- or target-specific hacks.  This is used for i960 targets
 670      to force the user to set a nindy target and spec its parameters.  */
 671
 672 #ifdef BEFORE_MAIN_LOOP_HOOK
 673   BEFORE_MAIN_LOOP_HOOK;
 674 #endif
 675
 676   END_PROGRESS (argv[0]);
 677
 678   /* Show time and/or space usage.  */
 679
 680   if (display_time)
 681     {
 682       long init_time = get_run_time () - time_at_startup;
 683
 684       printf_unfiltered (_("Startup time: %ld.%06ld\n"),
 685                          init_time / 1000000, init_time % 1000000);
 686     }
 687
 688   if (display_space)
 689     {
 690 #ifdef HAVE_SBRK
 691       extern char **environ;
 692       char *lim = (char *) sbrk (0);
 693
 694       printf_unfiltered (_("Startup size: data size %ld\n"),
 695                          (long) (lim - (char *) &environ));
 696 #endif
 697     }
 698
 699 #if 0
 700   /* FIXME: cagney/1999-11-06: The original main loop was like: */
 701   while (1)
 702     {
 703       if (!SET_TOP_LEVEL ())
 704         {
 705           do_cleanups (ALL_CLEANUPS);   /* Do complete cleanup */
 706           /* GUIs generally have their own command loop, mainloop, or whatever.
 707              This is a good place to gain control because many error
 708              conditions will end up here via longjmp(). */
 709           if (command_loop_hook)
 710             command_loop_hook ();
 711           else
 712             command_loop ();
 713           quit_command ((char *) 0, instream == stdin);
 714         }
 715     }
 716   /* NOTE: If the command_loop() returned normally, the loop would
 717      attempt to exit by calling the function quit_command().  That
 718      function would either call exit() or throw an error returning
 719      control to SET_TOP_LEVEL. */
 720   /* NOTE: The function do_cleanups() was called once each time round
 721      the loop.  The usefulness of the call isn't clear.  If an error
 722      was thrown, everything would have already been cleaned up.  If
 723      command_loop() returned normally and quit_command() was called,
 724      either exit() or error() (again cleaning up) would be called. */
 725 #endif
 726   /* NOTE: cagney/1999-11-07: There is probably no reason for not
 727      moving this loop and the code found in captured_command_loop()
 728      into the command_loop() proper.  The main thing holding back that
 729      change - SET_TOP_LEVEL() - has been eliminated. */
 730   while (1)
 731     {
 732       catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
 733     }
 734   /* No exit -- exit is through quit_command.  */
 735 }
 736
 737 int
 738 main (int argc, char **argv)
 739 {
 740   struct captured_main_args args;
 741   args.argc = argc;
 742   args.argv = argv;
 743   catch_errors (captured_main, &args, "", RETURN_MASK_ALL);
 744   return 0;
 745 }
 746
 747
 748 /* Don't use *_filtered for printing help.  We don't want to prompt
 749    for continue no matter how small the screen or how much we're going
 750    to print.  */
 751
 752 static void
 753 print_gdb_help (struct ui_file *stream)
 754 {
 755   fputs_unfiltered (_("\
 756 This is the GNU debugger.  Usage:\n\n\
 757     gdb [options] [executable-file [core-file or process-id]]\n\
 758     gdb [options] --args executable-file [inferior-arguments ...]\n\n\
 759 Options:\n\n\
 760 "), stream);
 761   fputs_unfiltered (_("\
 762   --args             Arguments after executable-file are passed to inferior\n\
 763 "), stream);
 764   fputs_unfiltered (_("\
 765   --[no]async        Enable (disable) asynchronous version of CLI\n\
 766 "), stream);
 767   fputs_unfiltered (_("\
 768   -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
 769   --batch            Exit after processing options.\n\
 770   --cd=DIR           Change current directory to DIR.\n\
 771   --command=FILE     Execute GDB commands from FILE.\n\
 772   --core=COREFILE    Analyze the core dump COREFILE.\n\
 773   --pid=PID          Attach to running process PID.\n\
 774 "), stream);
 775   fputs_unfiltered (_("\
 776   --dbx              DBX compatibility mode.\n\
 777   --directory=DIR    Search for source files in DIR.\n\
 778   --epoch            Output information used by epoch emacs-GDB interface.\n\
 779   --exec=EXECFILE    Use EXECFILE as the executable.\n\
 780   --fullname         Output information used by emacs-GDB interface.\n\
 781   --help             Print this message.\n\
 782 "), stream);
 783   fputs_unfiltered (_("\
 784   --interpreter=INTERP\n\
 785                      Select a specific interpreter / user interface\n\
 786 "), stream);
 787   fputs_unfiltered (_("\
 788   --mapped           Use mapped symbol files if supported on this system.\n\
 789   --nw               Do not use a window interface.\n\
 790   --nx               Do not read "), stream);
 791   fputs_unfiltered (gdbinit, stream);
 792   fputs_unfiltered (_(" file.\n\
 793   --quiet            Do not print version number on startup.\n\
 794   --readnow          Fully read symbol files on first access.\n\
 795 "), stream);
 796   fputs_unfiltered (_("\
 797   --se=FILE          Use FILE as symbol file and executable file.\n\
 798   --symbols=SYMFILE  Read symbols from SYMFILE.\n\
 799   --tty=TTY          Use TTY for input/output by the program being debugged.\n\
 800 "), stream);
 801 #if defined(TUI)
 802   fputs_unfiltered (_("\
 803   --tui              Use a terminal user interface.\n\
 804 "), stream);
 805 #endif
 806   fputs_unfiltered (_("\
 807   --version          Print version information and then exit.\n\
 808   -w                 Use a window interface.\n\
 809   --write            Set writing into executable and core files.\n\
 810   --xdb              XDB compatibility mode.\n\
 811 "), stream);
 812 #ifdef ADDITIONAL_OPTION_HELP
 813   fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
 814 #endif
 815   fputs_unfiltered (_("\n\
 816 For more information, type \"help\" from within GDB, or consult the\n\
 817 GDB manual (available as on-line info or a printed manual).\n\
 818 Report bugs to \"bug-gdb@gnu.org\".\
 819 "), stream);
 820 }