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