aboutsummaryrefslogtreecommitdiff
path: root/gdb/main.c
blob: 2d552c09b12cddbfcd4a8bca7b8265f996ea7e96 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
/* Top level stuff for GDB, the GNU debugger.

   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
   1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
   Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "top.h"
#include "target.h"
#include "inferior.h"
#include "symfile.h"
#include "gdbcore.h"

#include "getopt.h"

#include <sys/types.h>
#include "gdb_stat.h"
#include <ctype.h>

#include "gdb_string.h"
#include "event-loop.h"
#include "ui-out.h"

#include "interps.h"
#include "main.h"

/* If nonzero, display time usage both at startup and for each command.  */

int display_time;

/* If nonzero, display space usage both at startup and for each command.  */

int display_space;

/* Whether this is the async version or not.  The async version is
   invoked on the command line with the -nw --async options.  In this
   version, the usual command_loop is substituted by and event loop which
   processes UI events asynchronously. */
int event_loop_p = 1;

/* The selected interpreter.  This will be used as a set command
   variable, so it should always be malloc'ed - since
   do_setshow_command will free it. */
char *interpreter_p;

/* Whether xdb commands will be handled */
int xdb_commands = 0;

/* Whether dbx commands will be handled */
int dbx_commands = 0;

/* System root path, used to find libraries etc.  */
char *gdb_sysroot = 0;

struct ui_file *gdb_stdout;
struct ui_file *gdb_stderr;
struct ui_file *gdb_stdlog;
struct ui_file *gdb_stdtarg;
struct ui_file *gdb_stdin;
/* target IO streams */
struct ui_file *gdb_stdtargin;
struct ui_file *gdb_stdtargerr;

/* Whether to enable writing into executable and core files */
extern int write_files;

static void print_gdb_help (struct ui_file *);

/* These two are used to set the external editor commands when gdb is farming
   out files to be edited by another program. */

extern char *external_editor_command;

/* Call command_loop.  If it happens to return, pass that through as a
   non-zero return status. */

static int
captured_command_loop (void *data)
{
  current_interp_command_loop ();
  /* FIXME: cagney/1999-11-05: A correct command_loop() implementaton
     would clean things up (restoring the cleanup chain) to the state
     they were just prior to the call.  Technically, this means that
     the do_cleanups() below is redundant.  Unfortunately, many FUNCs
     are not that well behaved.  do_cleanups should either be replaced
     with a do_cleanups call (to cover the problem) or an assertion
     check to detect bad FUNCs code. */
  do_cleanups (ALL_CLEANUPS);
  /* If the command_loop returned, normally (rather than threw an
     error) we try to quit. If the quit is aborted, catch_errors()
     which called this catch the signal and restart the command
     loop. */
  quit_command (NULL, instream == stdin);
  return 1;
}

static int
captured_main (void *data)
{
  struct captured_main_args *context = data;
  int argc = context->argc;
  char **argv = context->argv;
  int count;
  static int quiet = 0;
  static int batch = 0;
  static int set_args = 0;

  /* Pointers to various arguments from command line.  */
  char *symarg = NULL;
  char *execarg = NULL;
  char *corearg = NULL;
  char *cdarg = NULL;
  char *ttyarg = NULL;

  /* These are static so that we can take their address in an initializer.  */
  static int print_help;
  static int print_version;

  /* Pointers to all arguments of --command option.  */
  char **cmdarg;
  /* Allocated size of cmdarg.  */
  int cmdsize;
  /* Number of elements of cmdarg used.  */
  int ncmd;

  /* Indices of all arguments of --directory option.  */
  char **dirarg;
  /* Allocated size.  */
  int dirsize;
  /* Number of elements used.  */
  int ndir;

  struct stat homebuf, cwdbuf;
  char *homedir, *homeinit;

  int i;

  long time_at_startup = get_run_time ();

#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
  setlocale (LC_MESSAGES, "");
#endif
#if defined (HAVE_SETLOCALE)
  setlocale (LC_CTYPE, "");
#endif
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  START_PROGRESS (argv[0], 0);

  /* This needs to happen before the first use of malloc.  */
  init_malloc (NULL);

#ifdef HAVE_SBRK
  lim_at_start = (char *) sbrk (0);
#endif

#if defined (ALIGN_STACK_ON_STARTUP)
  i = (int) &count & 0x3;
  if (i != 0)
    alloca (4 - i);
#endif

  cmdsize = 1;
  cmdarg = (char **) xmalloc (cmdsize * sizeof (*cmdarg));
  ncmd = 0;
  dirsize = 1;
  dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
  ndir = 0;

  quit_flag = 0;
  line = (char *) xmalloc (linesize);
  line[0] = '\0';		/* Terminate saved (now empty) cmd line */
  instream = stdin;

  getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
  current_directory = gdb_dirbuf;

  gdb_stdout = stdio_fileopen (stdout);
  gdb_stderr = stdio_fileopen (stderr);
  gdb_stdlog = gdb_stderr;	/* for moment */
  gdb_stdtarg = gdb_stderr;	/* for moment */
  gdb_stdin = stdio_fileopen (stdin);
  gdb_stdtargerr = gdb_stderr;	/* for moment */
  gdb_stdtargin = gdb_stdin;	/* for moment */

  /* initialize error() */
  error_init ();

  /* Set the sysroot path.  */
#ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
  gdb_sysroot = make_relative_prefix (argv[0], BINDIR, TARGET_SYSTEM_ROOT);
  if (gdb_sysroot)
    {
      struct stat s;
      int res = 0;

      if (stat (gdb_sysroot, &s) == 0)
	if (S_ISDIR (s.st_mode))
	  res = 1;

      if (res == 0)
	{
	  xfree (gdb_sysroot);
	  gdb_sysroot = TARGET_SYSTEM_ROOT;
	}
    }
  else
    gdb_sysroot = TARGET_SYSTEM_ROOT;
#else
#if defined (TARGET_SYSTEM_ROOT)
  gdb_sysroot = TARGET_SYSTEM_ROOT;
#else
  gdb_sysroot = "";
#endif
#endif

  /* There will always be an interpreter.  Either the one passed into
     this captured main, or one specified by the user at start up, or
     the console.  Initialize the interpreter to the one requested by 
     the application.  */
  interpreter_p = xstrdup (context->interpreter_p);

  /* Parse arguments and options.  */
  {
    int c;
    /* When var field is 0, use flag field to record the equivalent
       short option (or arbitrary numbers starting at 10 for those
       with no equivalent).  */
    enum {
      OPT_SE = 10,
      OPT_CD,
      OPT_ANNOTATE,
      OPT_STATISTICS,
      OPT_TUI,
      OPT_NOWINDOWS,
      OPT_WINDOWS
    };
    static struct option long_options[] =
    {
      {"async", no_argument, &event_loop_p, 1},
      {"noasync", no_argument, &event_loop_p, 0},
#if defined(TUI)
      {"tui", no_argument, 0, OPT_TUI},
#endif
      {"xdb", no_argument, &xdb_commands, 1},
      {"dbx", no_argument, &dbx_commands, 1},
      {"readnow", no_argument, &readnow_symbol_files, 1},
      {"r", no_argument, &readnow_symbol_files, 1},
      {"mapped", no_argument, &mapped_symbol_files, 1},
      {"m", no_argument, &mapped_symbol_files, 1},
      {"quiet", no_argument, &quiet, 1},
      {"q", no_argument, &quiet, 1},
      {"silent", no_argument, &quiet, 1},
      {"nx", no_argument, &inhibit_gdbinit, 1},
      {"n", no_argument, &inhibit_gdbinit, 1},
      {"batch", no_argument, &batch, 1},
      {"epoch", no_argument, &epoch_interface, 1},

    /* This is a synonym for "--annotate=1".  --annotate is now preferred,
       but keep this here for a long time because people will be running
       emacses which use --fullname.  */
      {"fullname", no_argument, 0, 'f'},
      {"f", no_argument, 0, 'f'},

      {"annotate", required_argument, 0, OPT_ANNOTATE},
      {"help", no_argument, &print_help, 1},
      {"se", required_argument, 0, OPT_SE},
      {"symbols", required_argument, 0, 's'},
      {"s", required_argument, 0, 's'},
      {"exec", required_argument, 0, 'e'},
      {"e", required_argument, 0, 'e'},
      {"core", required_argument, 0, 'c'},
      {"c", required_argument, 0, 'c'},
      {"pid", required_argument, 0, 'p'},
      {"p", required_argument, 0, 'p'},
      {"command", required_argument, 0, 'x'},
      {"version", no_argument, &print_version, 1},
      {"x", required_argument, 0, 'x'},
#ifdef GDBTK
      {"tclcommand", required_argument, 0, 'z'},
      {"enable-external-editor", no_argument, 0, 'y'},
      {"editor-command", required_argument, 0, 'w'},
#endif
      {"ui", required_argument, 0, 'i'},
      {"interpreter", required_argument, 0, 'i'},
      {"i", required_argument, 0, 'i'},
      {"directory", required_argument, 0, 'd'},
      {"d", required_argument, 0, 'd'},
      {"cd", required_argument, 0, OPT_CD},
      {"tty", required_argument, 0, 't'},
      {"baud", required_argument, 0, 'b'},
      {"b", required_argument, 0, 'b'},
      {"nw", no_argument, NULL, OPT_NOWINDOWS},
      {"nowindows", no_argument, NULL, OPT_NOWINDOWS},
      {"w", no_argument, NULL, OPT_WINDOWS},
      {"windows", no_argument, NULL, OPT_WINDOWS},
      {"statistics", no_argument, 0, OPT_STATISTICS},
      {"write", no_argument, &write_files, 1},
      {"args", no_argument, &set_args, 1},
      {0, no_argument, 0, 0}
    };

    while (1)
      {
	int option_index;

	c = getopt_long_only (argc, argv, "",
			      long_options, &option_index);
	if (c == EOF || set_args)
	  break;

	/* Long option that takes an argument.  */
	if (c == 0 && long_options[option_index].flag == 0)
	  c = long_options[option_index].val;

	switch (c)
	  {
	  case 0:
	    /* Long option that just sets a flag.  */
	    break;
	  case OPT_SE:
	    symarg = optarg;
	    execarg = optarg;
	    break;
	  case OPT_CD:
	    cdarg = optarg;
	    break;
	  case OPT_ANNOTATE:
	    /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
	    annotation_level = atoi (optarg);
	    break;
	  case OPT_STATISTICS:
	    /* Enable the display of both time and space usage.  */
	    display_time = 1;
	    display_space = 1;
	    break;
	  case OPT_TUI:
	    /* --tui is equivalent to -i=tui.  */
	    xfree (interpreter_p);
	    interpreter_p = xstrdup ("tui");
	    break;
	  case OPT_WINDOWS:
	    /* FIXME: cagney/2003-03-01: Not sure if this option is
               actually useful, and if it is, what it should do.  */
	    use_windows = 1;
	    break;
	  case OPT_NOWINDOWS:
	    /* -nw is equivalent to -i=console.  */
	    xfree (interpreter_p);
	    interpreter_p = xstrdup (INTERP_CONSOLE);
	    use_windows = 0;
	    break;
	  case 'f':
	    annotation_level = 1;
/* We have probably been invoked from emacs.  Disable window interface.  */
	    use_windows = 0;
	    break;
	  case 's':
	    symarg = optarg;
	    break;
	  case 'e':
	    execarg = optarg;
	    break;
	  case 'c':
	    corearg = optarg;
	    break;
	  case 'p':
	    /* "corearg" is shared by "--core" and "--pid" */
	    corearg = optarg;
	    break;
	  case 'x':
	    cmdarg[ncmd++] = optarg;
	    if (ncmd >= cmdsize)
	      {
		cmdsize *= 2;
		cmdarg = (char **) xrealloc ((char *) cmdarg,
					     cmdsize * sizeof (*cmdarg));
	      }
	    break;
#ifdef GDBTK
	  case 'z':
	    {
extern int gdbtk_test (char *);
	      if (!gdbtk_test (optarg))
		{
		  fprintf_unfiltered (gdb_stderr, _("%s: unable to load tclcommand file \"%s\""),
				      argv[0], optarg);
		  exit (1);
		}
	      break;
	    }
	  case 'y':
	    /* Backwards compatibility only.  */
	    break;
	  case 'w':
	    {
	      external_editor_command = xstrdup (optarg);
	      break;
	    }
#endif /* GDBTK */
	  case 'i':
	    xfree (interpreter_p);
	    interpreter_p = xstrdup (optarg);
	    break;
	  case 'd':
	    dirarg[ndir++] = optarg;
	    if (ndir >= dirsize)
	      {
		dirsize *= 2;
		dirarg = (char **) xrealloc ((char *) dirarg,
					     dirsize * sizeof (*dirarg));
	      }
	    break;
	  case 't':
	    ttyarg = optarg;
	    break;
	  case 'q':
	    quiet = 1;
	    break;
	  case 'b':
	    {
	      int i;
	      char *p;

	      i = strtol (optarg, &p, 0);
	      if (i == 0 && p == optarg)

		/* Don't use *_filtered or warning() (which relies on
		   current_target) until after initialize_all_files(). */

		fprintf_unfiltered
		  (gdb_stderr,
		   _("warning: could not set baud rate to `%s'.\n"), optarg);
	      else
		baud_rate = i;
	    }
            break;
	  case 'l':
	    {
	      int i;
	      char *p;

	      i = strtol (optarg, &p, 0);
	      if (i == 0 && p == optarg)

		/* Don't use *_filtered or warning() (which relies on
		   current_target) until after initialize_all_files(). */

		fprintf_unfiltered
		  (gdb_stderr,
		 _("warning: could not set timeout limit to `%s'.\n"), optarg);
	      else
		remote_timeout = i;
	    }
	    break;

	  case '?':
	    fprintf_unfiltered (gdb_stderr,
			_("Use `%s --help' for a complete list of options.\n"),
				argv[0]);
	    exit (1);
	  }
      }

    /* If --help or --version, disable window interface.  */
    if (print_help || print_version)
      {
	use_windows = 0;
      }

    if (set_args)
      {
	/* The remaining options are the command-line options for the
	   inferior.  The first one is the sym/exec file, and the rest
	   are arguments.  */
	if (optind >= argc)
	  {
	    fprintf_unfiltered (gdb_stderr,
				_("%s: `--args' specified but no program specified\n"),
				argv[0]);
	    exit (1);
	  }
	symarg = argv[optind];
	execarg = argv[optind];
	++optind;
	set_inferior_args_vector (argc - optind, &argv[optind]);
      }
    else
      {
	/* OK, that's all the options.  The other arguments are filenames.  */
	count = 0;
	for (; optind < argc; optind++)
	  switch (++count)
	    {
	    case 1:
	      symarg = argv[optind];
	      execarg = argv[optind];
	      break;
	    case 2:
	      /* The documentation says this can be a "ProcID" as well. 
	         We will try it as both a corefile and a pid.  */
	      corearg = argv[optind];
	      break;
	    case 3:
	      fprintf_unfiltered (gdb_stderr,
				  _("Excess command line arguments ignored. (%s%s)\n"),
				  argv[optind], (optind == argc - 1) ? "" : " ...");
	      break;
	    }
      }
    if (batch)
      quiet = 1;
  }

  /* Initialize all files.  Give the interpreter a chance to take
     control of the console via the init_ui_hook()) */
  gdb_init (argv[0]);

  /* Do these (and anything which might call wrap_here or *_filtered)
     after initialize_all_files() but before the interpreter has been
     installed.  Otherwize the help/version messages will be eaten by
     the interpreter's output handler.  */

  if (print_version)
    {
      print_gdb_version (gdb_stdout);
      wrap_here ("");
      printf_filtered ("\n");
      exit (0);
    }

  if (print_help)
    {
      print_gdb_help (gdb_stdout);
      fputs_unfiltered ("\n", gdb_stdout);
      exit (0);
    }

  /* FIXME: cagney/2003-02-03: The big hack (part 1 of 2) that lets
     GDB retain the old MI1 interpreter startup behavior.  Output the
     copyright message before the interpreter is installed.  That way
     it isn't encapsulated in MI output.  */
  if (!quiet && strcmp (interpreter_p, INTERP_MI1) == 0)
    {
      /* Print all the junk at the top, with trailing "..." if we are about
         to read a symbol file (possibly slowly).  */
      print_gdb_version (gdb_stdout);
      if (symarg)
	printf_filtered ("..");
      wrap_here ("");
      gdb_flush (gdb_stdout);	/* Force to screen during slow operations */
    }


  /* Install the default UI.  All the interpreters should have had a
     look at things by now.  Initialize the default interpreter. */

  {
    /* Find it.  */
    struct interp *interp = interp_lookup (interpreter_p);
    if (interp == NULL)
      error ("Interpreter `%s' unrecognized", interpreter_p);
    /* Install it.  */
    if (!interp_set (interp))
      {
        fprintf_unfiltered (gdb_stderr,
			    "Interpreter `%s' failed to initialize.\n",
                            interpreter_p);
        exit (1);
      }
  }

  /* FIXME: cagney/2003-02-03: The big hack (part 2 of 2) that lets
     GDB retain the old MI1 interpreter startup behavior.  Output the
     copyright message after the interpreter is installed when it is
     any sane interpreter.  */
  if (!quiet && !current_interp_named_p (INTERP_MI1))
    {
      /* Print all the junk at the top, with trailing "..." if we are about
         to read a symbol file (possibly slowly).  */
      print_gdb_version (gdb_stdout);
      if (symarg)
	printf_filtered ("..");
      wrap_here ("");
      gdb_flush (gdb_stdout);	/* Force to screen during slow operations */
    }

  error_pre_print = "\n\n";
  quit_pre_print = error_pre_print;

  /* We may get more than one warning, don't double space all of them... */
  warning_pre_print = _("\nwarning: ");

  /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
     *before* all the command line arguments are processed; it sets
     global parameters, which are independent of what file you are
     debugging or what directory you are in.  */
  homedir = getenv ("HOME");
  if (homedir)
    {
      homeinit = (char *) alloca (strlen (homedir) +
				  strlen (gdbinit) + 10);
      strcpy (homeinit, homedir);
      strcat (homeinit, "/");
      strcat (homeinit, gdbinit);

      if (!inhibit_gdbinit)
	{
	  catch_command_errors (source_command, homeinit, 0, RETURN_MASK_ALL);
	}

      /* Do stats; no need to do them elsewhere since we'll only
         need them if homedir is set.  Make sure that they are
         zero in case one of them fails (this guarantees that they
         won't match if either exists).  */

      memset (&homebuf, 0, sizeof (struct stat));
      memset (&cwdbuf, 0, sizeof (struct stat));

      stat (homeinit, &homebuf);
      stat (gdbinit, &cwdbuf);	/* We'll only need this if
				   homedir was set.  */
    }

  /* Now perform all the actions indicated by the arguments.  */
  if (cdarg != NULL)
    {
      catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
    }

  for (i = 0; i < ndir; i++)
    catch_command_errors (directory_command, dirarg[i], 0, RETURN_MASK_ALL);
  xfree (dirarg);

  if (execarg != NULL
      && symarg != NULL
      && strcmp (execarg, symarg) == 0)
    {
      /* The exec file and the symbol-file are the same.  If we can't
         open it, better only print one error message.
         catch_command_errors returns non-zero on success! */
      if (catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL))
	catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
    }
  else
    {
      if (execarg != NULL)
	catch_command_errors (exec_file_attach, execarg, !batch, RETURN_MASK_ALL);
      if (symarg != NULL)
	catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
    }

  /* After the symbol file has been read, print a newline to get us
     beyond the copyright line...  But errors should still set off
     the error message with a (single) blank line.  */
  if (!quiet)
    printf_filtered ("\n");
  error_pre_print = "\n";
  quit_pre_print = error_pre_print;
  warning_pre_print = _("\nwarning: ");

  if (corearg != NULL)
    {
      /* corearg may be either a corefile or a pid.
	 If its first character is a digit, try attach first
	 and then corefile.  Otherwise try corefile first. */

      if (isdigit (corearg[0]))
	{
	  if (catch_command_errors (attach_command, corearg, 
				    !batch, RETURN_MASK_ALL) == 0)
	    catch_command_errors (core_file_command, corearg, 
				  !batch, RETURN_MASK_ALL);
	}
      else /* Can't be a pid, better be a corefile. */
	catch_command_errors (core_file_command, corearg, 
			      !batch, RETURN_MASK_ALL);
    }

  if (ttyarg != NULL)
    catch_command_errors (tty_command, ttyarg, !batch, RETURN_MASK_ALL);

  /* Error messages should no longer be distinguished with extra output. */
  error_pre_print = NULL;
  quit_pre_print = NULL;
  warning_pre_print = _("warning: ");

  /* Read the .gdbinit file in the current directory, *if* it isn't
     the same as the $HOME/.gdbinit file (it should exist, also).  */

  if (!homedir
      || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
    if (!inhibit_gdbinit)
      {
	catch_command_errors (source_command, gdbinit, 0, RETURN_MASK_ALL);
      }

  for (i = 0; i < ncmd; i++)
    {
#if 0
      /* NOTE: cagney/1999-11-03: SET_TOP_LEVEL() was a macro that
         expanded into a call to setjmp().  */
      if (!SET_TOP_LEVEL ()) /* NB: This is #if 0'd out */
	{
	  /* NOTE: I am commenting this out, because it is not clear
	     where this feature is used. It is very old and
	     undocumented. ezannoni: 1999-05-04 */
#if 0
	  if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
	    read_command_file (stdin);
	  else
#endif
	    source_command (cmdarg[i], !batch);
	  do_cleanups (ALL_CLEANUPS);
	}
#endif
      catch_command_errors (source_command, cmdarg[i], !batch, RETURN_MASK_ALL);
    }
  xfree (cmdarg);

  /* Read in the old history after all the command files have been read. */
  init_history ();

  if (batch)
    {
      /* We have hit the end of the batch file.  */
      exit (0);
    }

  /* Do any host- or target-specific hacks.  This is used for i960 targets
     to force the user to set a nindy target and spec its parameters.  */

#ifdef BEFORE_MAIN_LOOP_HOOK
  BEFORE_MAIN_LOOP_HOOK;
#endif

  END_PROGRESS (argv[0]);

  /* Show time and/or space usage.  */

  if (display_time)
    {
      long init_time = get_run_time () - time_at_startup;

      printf_unfiltered (_("Startup time: %ld.%06ld\n"),
			 init_time / 1000000, init_time % 1000000);
    }

  if (display_space)
    {
#ifdef HAVE_SBRK
      extern char **environ;
      char *lim = (char *) sbrk (0);

      printf_unfiltered (_("Startup size: data size %ld\n"),
			 (long) (lim - (char *) &environ));
#endif
    }

#if 0
  /* FIXME: cagney/1999-11-06: The original main loop was like: */
  while (1)
    {
      if (!SET_TOP_LEVEL ())
	{
	  do_cleanups (ALL_CLEANUPS);	/* Do complete cleanup */
	  /* GUIs generally have their own command loop, mainloop, or whatever.
	     This is a good place to gain control because many error
	     conditions will end up here via longjmp(). */
	  if (command_loop_hook)
	    command_loop_hook ();
	  else
	    command_loop ();
	  quit_command ((char *) 0, instream == stdin);
	}
    }
  /* NOTE: If the command_loop() returned normally, the loop would
     attempt to exit by calling the function quit_command().  That
     function would either call exit() or throw an error returning
     control to SET_TOP_LEVEL. */
  /* NOTE: The function do_cleanups() was called once each time round
     the loop.  The usefulness of the call isn't clear.  If an error
     was thrown, everything would have already been cleaned up.  If
     command_loop() returned normally and quit_command() was called,
     either exit() or error() (again cleaning up) would be called. */
#endif
  /* NOTE: cagney/1999-11-07: There is probably no reason for not
     moving this loop and the code found in captured_command_loop()
     into the command_loop() proper.  The main thing holding back that
     change - SET_TOP_LEVEL() - has been eliminated. */
  while (1)
    {
      catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
    }
  /* No exit -- exit is through quit_command.  */
}

int
gdb_main (struct captured_main_args *args)
{
  use_windows = args->use_windows;
  catch_errors (captured_main, args, "", RETURN_MASK_ALL);
  /* The only way to end up here is by an error (normal exit is
     handled by quit_force()), hence always return an error status.  */
  return 1;
}


/* Don't use *_filtered for printing help.  We don't want to prompt
   for continue no matter how small the screen or how much we're going
   to print.  */

static void
print_gdb_help (struct ui_file *stream)
{
  fputs_unfiltered (_("\
This is the GNU debugger.  Usage:\n\n\
    gdb [options] [executable-file [core-file or process-id]]\n\
    gdb [options] --args executable-file [inferior-arguments ...]\n\n\
Options:\n\n\
"), stream);
  fputs_unfiltered (_("\
  --args             Arguments after executable-file are passed to inferior\n\
"), stream);
  fputs_unfiltered (_("\
  --[no]async        Enable (disable) asynchronous version of CLI\n\
"), stream);
  fputs_unfiltered (_("\
  -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
  --batch            Exit after processing options.\n\
  --cd=DIR           Change current directory to DIR.\n\
  --command=FILE     Execute GDB commands from FILE.\n\
  --core=COREFILE    Analyze the core dump COREFILE.\n\
  --pid=PID          Attach to running process PID.\n\
"), stream);
  fputs_unfiltered (_("\
  --dbx              DBX compatibility mode.\n\
  --directory=DIR    Search for source files in DIR.\n\
  --epoch            Output information used by epoch emacs-GDB interface.\n\
  --exec=EXECFILE    Use EXECFILE as the executable.\n\
  --fullname         Output information used by emacs-GDB interface.\n\
  --help             Print this message.\n\
"), stream);
  fputs_unfiltered (_("\
  --interpreter=INTERP\n\
                     Select a specific interpreter / user interface\n\
"), stream);
  fputs_unfiltered (_("\
  --mapped           Use mapped symbol files if supported on this system.\n\
  --nw		     Do not use a window interface.\n\
  --nx               Do not read "), stream);
  fputs_unfiltered (gdbinit, stream);
  fputs_unfiltered (_(" file.\n\
  --quiet            Do not print version number on startup.\n\
  --readnow          Fully read symbol files on first access.\n\
"), stream);
  fputs_unfiltered (_("\
  --se=FILE          Use FILE as symbol file and executable file.\n\
  --symbols=SYMFILE  Read symbols from SYMFILE.\n\
  --tty=TTY          Use TTY for input/output by the program being debugged.\n\
"), stream);
#if defined(TUI)
  fputs_unfiltered (_("\
  --tui              Use a terminal user interface.\n\
"), stream);
#endif
  fputs_unfiltered (_("\
  --version          Print version information and then exit.\n\
  -w                 Use a window interface.\n\
  --write            Set writing into executable and core files.\n\
  --xdb              XDB compatibility mode.\n\
"), stream);
  fputs_unfiltered (_("\n\
For more information, type \"help\" from within GDB, or consult the\n\
GDB manual (available as on-line info or a printed manual).\n\
Report bugs to \"bug-gdb@gnu.org\".\
"), stream);
}