gdb/main.c

   1 /* Top level stuff for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2005, 2007-2012 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "top.h"
  22 #include "target.h"
  23 #include "inferior.h"
  24 #include "symfile.h"
  25 #include "gdbcore.h"
  26
  27 #include "exceptions.h"
  28 #include "getopt.h"
  29
  30 #include <sys/types.h>
  31 #include "gdb_stat.h"
  32 #include <ctype.h>
  33
  34 #include "gdb_string.h"
  35 #include "event-loop.h"
  36 #include "ui-out.h"
  37
  38 #include "interps.h"
  39 #include "main.h"
  40 #include "source.h"
  41 #include "cli/cli-cmds.h"
  42 #include "python/python.h"
  43 #include "objfiles.h"
  44
  45 /* The selected interpreter.  This will be used as a set command
  46    variable, so it should always be malloc'ed - since
  47    do_setshow_command will free it.  */
  48 char *interpreter_p;
  49
  50 /* Whether xdb commands will be handled.  */
  51 int xdb_commands = 0;
  52
  53 /* Whether dbx commands will be handled.  */
  54 int dbx_commands = 0;
  55
  56 /* System root path, used to find libraries etc.  */
  57 char *gdb_sysroot = 0;
  58
  59 /* GDB datadir, used to store data files.  */
  60 char *gdb_datadir = 0;
  61
  62 /* If gdb was configured with --with-python=/path,
  63    the possibly relocated path to python's lib directory.  */
  64 char *python_libdir = 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_stdin;
  70 /* Target IO streams.  */
  71 struct ui_file *gdb_stdtargin;
  72 struct ui_file *gdb_stdtarg;
  73 struct ui_file *gdb_stdtargerr;
  74
  75 /* True if --batch or --batch-silent was seen.  */
  76 int batch_flag = 0;
  77
  78 /* Support for the --batch-silent option.  */
  79 int batch_silent = 0;
  80
  81 /* Support for --return-child-result option.
  82    Set the default to -1 to return error in the case
  83    that the program does not run or does not complete.  */
  84 int return_child_result = 0;
  85 int return_child_result_value = -1;
  86
  87 /* Whether to enable writing into executable and core files.  */
  88 extern int write_files;
  89
  90 /* GDB as it has been invoked from the command line (i.e. argv[0]).  */
  91 static char *gdb_program_name;
  92
  93 static void print_gdb_help (struct ui_file *);
  94
  95 /* These two are used to set the external editor commands when gdb is
  96    farming out files to be edited by another program.  */
  97
  98 extern char *external_editor_command;
  99
 100 /* Relocate a file or directory.  PROGNAME is the name by which gdb
 101    was invoked (i.e., argv[0]).  INITIAL is the default value for the
 102    file or directory.  FLAG is true if the value is relocatable, false
 103    otherwise.  Returns a newly allocated string; this may return NULL
 104    under the same conditions as make_relative_prefix.  */
 105
 106 static char *
 107 relocate_path (const char *progname, const char *initial, int flag)
 108 {
 109   if (flag)
 110     return make_relative_prefix (progname, BINDIR, initial);
 111   return xstrdup (initial);
 112 }
 113
 114 /* Like relocate_path, but specifically checks for a directory.
 115    INITIAL is relocated according to the rules of relocate_path.  If
 116    the result is a directory, it is used; otherwise, INITIAL is used.
 117    The chosen directory is then canonicalized using lrealpath.  This
 118    function always returns a newly-allocated string.  */
 119
 120 char *
 121 relocate_gdb_directory (const char *initial, int flag)
 122 {
 123   char *dir;
 124
 125   dir = relocate_path (gdb_program_name, initial, flag);
 126   if (dir)
 127     {
 128       struct stat s;
 129
 130       if (stat (dir, &s) != 0 || !S_ISDIR (s.st_mode))
 131         {
 132           xfree (dir);
 133           dir = NULL;
 134         }
 135     }
 136   if (!dir)
 137     dir = xstrdup (initial);
 138
 139   /* Canonicalize the directory.  */
 140   if (*dir)
 141     {
 142       char *canon_sysroot = lrealpath (dir);
 143
 144       if (canon_sysroot)
 145         {
 146           xfree (dir);
 147           dir = canon_sysroot;
 148         }
 149     }
 150
 151   return dir;
 152 }
 153
 154 /* Compute the locations of init files that GDB should source and
 155    return them in SYSTEM_GDBINIT, HOME_GDBINIT, LOCAL_GDBINIT.  If
 156    there is no system gdbinit (resp. home gdbinit and local gdbinit)
 157    to be loaded, then SYSTEM_GDBINIT (resp. HOME_GDBINIT and
 158    LOCAL_GDBINIT) is set to NULL.  */
 159 static void
 160 get_init_files (char **system_gdbinit,
 161                 char **home_gdbinit,
 162                 char **local_gdbinit)
 163 {
 164   static char *sysgdbinit = NULL;
 165   static char *homeinit = NULL;
 166   static char *localinit = NULL;
 167   static int initialized = 0;
 168
 169   if (!initialized)
 170     {
 171       struct stat homebuf, cwdbuf, s;
 172       char *homedir, *relocated_sysgdbinit;
 173
 174       if (SYSTEM_GDBINIT[0])
 175         {
 176           relocated_sysgdbinit = relocate_path (gdb_program_name,
 177                                                 SYSTEM_GDBINIT,
 178                                                 SYSTEM_GDBINIT_RELOCATABLE);
 179           if (relocated_sysgdbinit && stat (relocated_sysgdbinit, &s) == 0)
 180             sysgdbinit = relocated_sysgdbinit;
 181           else
 182             xfree (relocated_sysgdbinit);
 183         }
 184
 185       homedir = getenv ("HOME");
 186
 187       /* If the .gdbinit file in the current directory is the same as
 188          the $HOME/.gdbinit file, it should not be sourced.  homebuf
 189          and cwdbuf are used in that purpose.  Make sure that the stats
 190          are zero in case one of them fails (this guarantees that they
 191          won't match if either exists).  */
 192
 193       memset (&homebuf, 0, sizeof (struct stat));
 194       memset (&cwdbuf, 0, sizeof (struct stat));
 195
 196       if (homedir)
 197         {
 198           homeinit = xstrprintf ("%s/%s", homedir, gdbinit);
 199           if (stat (homeinit, &homebuf) != 0)
 200             {
 201               xfree (homeinit);
 202               homeinit = NULL;
 203             }
 204         }
 205
 206       if (stat (gdbinit, &cwdbuf) == 0)
 207         {
 208           if (!homeinit
 209               || memcmp ((char *) &homebuf, (char *) &cwdbuf,
 210                          sizeof (struct stat)))
 211             localinit = gdbinit;
 212         }
 213
 214       initialized = 1;
 215     }
 216
 217   *system_gdbinit = sysgdbinit;
 218   *home_gdbinit = homeinit;
 219   *local_gdbinit = localinit;
 220 }
 221
 222 /* Call command_loop.  If it happens to return, pass that through as a
 223    non-zero return status.  */
 224
 225 static int
 226 captured_command_loop (void *data)
 227 {
 228   /* Top-level execution commands can be run on the background from
 229      here on.  */
 230   interpreter_async = 1;
 231
 232   current_interp_command_loop ();
 233   /* FIXME: cagney/1999-11-05: A correct command_loop() implementaton
 234      would clean things up (restoring the cleanup chain) to the state
 235      they were just prior to the call.  Technically, this means that
 236      the do_cleanups() below is redundant.  Unfortunately, many FUNCs
 237      are not that well behaved.  do_cleanups should either be replaced
 238      with a do_cleanups call (to cover the problem) or an assertion
 239      check to detect bad FUNCs code.  */
 240   do_cleanups (ALL_CLEANUPS);
 241   /* If the command_loop returned, normally (rather than threw an
 242      error) we try to quit.  If the quit is aborted, catch_errors()
 243      which called this catch the signal and restart the command
 244      loop.  */
 245   quit_command (NULL, instream == stdin);
 246   return 1;
 247 }
 248
 249 static int
 250 captured_main (void *data)
 251 {
 252   struct captured_main_args *context = data;
 253   int argc = context->argc;
 254   char **argv = context->argv;
 255   static int quiet = 0;
 256   static int set_args = 0;
 257
 258   /* Pointers to various arguments from command line.  */
 259   char *symarg = NULL;
 260   char *execarg = NULL;
 261   char *pidarg = NULL;
 262   char *corearg = NULL;
 263   char *pid_or_core_arg = NULL;
 264   char *cdarg = NULL;
 265   char *ttyarg = NULL;
 266
 267   /* These are static so that we can take their address in an
 268      initializer.  */
 269   static int print_help;
 270   static int print_version;
 271
 272   /* Pointers to all arguments of --command option.  */
 273   struct cmdarg {
 274     enum {
 275       CMDARG_FILE,
 276       CMDARG_COMMAND
 277     } type;
 278     char *string;
 279   } *cmdarg;
 280   /* Allocated size of cmdarg.  */
 281   int cmdsize;
 282   /* Number of elements of cmdarg used.  */
 283   int ncmd;
 284
 285   /* Indices of all arguments of --directory option.  */
 286   char **dirarg;
 287   /* Allocated size.  */
 288   int dirsize;
 289   /* Number of elements used.  */
 290   int ndir;
 291
 292   /* gdb init files.  */
 293   char *system_gdbinit;
 294   char *home_gdbinit;
 295   char *local_gdbinit;
 296
 297   int i;
 298   int save_auto_load;
 299   struct objfile *objfile;
 300
 301   struct cleanup *pre_stat_chain;
 302
 303 #ifdef HAVE_SBRK
 304   /* Set this before calling make_command_stats_cleanup.  */
 305   lim_at_start = (char *) sbrk (0);
 306 #endif
 307
 308   pre_stat_chain = make_command_stats_cleanup (0);
 309
 310 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
 311   setlocale (LC_MESSAGES, "");
 312 #endif
 313 #if defined (HAVE_SETLOCALE)
 314   setlocale (LC_CTYPE, "");
 315 #endif
 316   bindtextdomain (PACKAGE, LOCALEDIR);
 317   textdomain (PACKAGE);
 318
 319   cmdsize = 1;
 320   cmdarg = (struct cmdarg *) xmalloc (cmdsize * sizeof (*cmdarg));
 321   ncmd = 0;
 322   dirsize = 1;
 323   dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));
 324   ndir = 0;
 325
 326   quit_flag = 0;
 327   saved_command_line = (char *) xmalloc (saved_command_line_size);
 328   saved_command_line[0] = '\0';
 329   instream = stdin;
 330
 331   gdb_stdout = stdio_fileopen (stdout);
 332   gdb_stderr = stdio_fileopen (stderr);
 333   gdb_stdlog = gdb_stderr;      /* for moment */
 334   gdb_stdtarg = gdb_stderr;     /* for moment */
 335   gdb_stdin = stdio_fileopen (stdin);
 336   gdb_stdtargerr = gdb_stderr;  /* for moment */
 337   gdb_stdtargin = gdb_stdin;    /* for moment */
 338
 339   gdb_program_name = xstrdup (argv[0]);
 340
 341   if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
 342     /* Don't use *_filtered or warning() (which relies on
 343        current_target) until after initialize_all_files().  */
 344     fprintf_unfiltered (gdb_stderr,
 345                         _("%s: warning: error finding "
 346                           "working directory: %s\n"),
 347                         argv[0], safe_strerror (errno));
 348
 349   current_directory = gdb_dirbuf;
 350
 351   /* Set the sysroot path.  */
 352   gdb_sysroot = relocate_gdb_directory (TARGET_SYSTEM_ROOT,
 353                                         TARGET_SYSTEM_ROOT_RELOCATABLE);
 354
 355   debug_file_directory = relocate_gdb_directory (DEBUGDIR,
 356                                                  DEBUGDIR_RELOCATABLE);
 357
 358   gdb_datadir = relocate_gdb_directory (GDB_DATADIR,
 359                                         GDB_DATADIR_RELOCATABLE);
 360
 361 #ifdef WITH_PYTHON_PATH
 362   {
 363     /* For later use in helping Python find itself.  */
 364     char *tmp = concat (WITH_PYTHON_PATH, SLASH_STRING, "lib", NULL);
 365
 366     python_libdir = relocate_gdb_directory (tmp, PYTHON_PATH_RELOCATABLE);
 367     xfree (tmp);
 368   }
 369 #endif
 370
 371 #ifdef RELOC_SRCDIR
 372   add_substitute_path_rule (RELOC_SRCDIR,
 373                             make_relative_prefix (argv[0], BINDIR,
 374                                                   RELOC_SRCDIR));
 375 #endif
 376
 377   /* There will always be an interpreter.  Either the one passed into
 378      this captured main, or one specified by the user at start up, or
 379      the console.  Initialize the interpreter to the one requested by
 380      the application.  */
 381   interpreter_p = xstrdup (context->interpreter_p);
 382
 383   /* Parse arguments and options.  */
 384   {
 385     int c;
 386     /* When var field is 0, use flag field to record the equivalent
 387        short option (or arbitrary numbers starting at 10 for those
 388        with no equivalent).  */
 389     enum {
 390       OPT_SE = 10,
 391       OPT_CD,
 392       OPT_ANNOTATE,
 393       OPT_STATISTICS,
 394       OPT_TUI,
 395       OPT_NOWINDOWS,
 396       OPT_WINDOWS
 397     };
 398     static struct option long_options[] =
 399     {
 400       {"tui", no_argument, 0, OPT_TUI},
 401       {"xdb", no_argument, &xdb_commands, 1},
 402       {"dbx", no_argument, &dbx_commands, 1},
 403       {"readnow", no_argument, &readnow_symbol_files, 1},
 404       {"r", no_argument, &readnow_symbol_files, 1},
 405       {"quiet", no_argument, &quiet, 1},
 406       {"q", no_argument, &quiet, 1},
 407       {"silent", no_argument, &quiet, 1},
 408       {"nx", no_argument, &inhibit_gdbinit, 1},
 409       {"n", no_argument, &inhibit_gdbinit, 1},
 410       {"batch-silent", no_argument, 0, 'B'},
 411       {"batch", no_argument, &batch_flag, 1},
 412       {"epoch", no_argument, &epoch_interface, 1},
 413
 414     /* This is a synonym for "--annotate=1".  --annotate is now
 415        preferred, but keep this here for a long time because people
 416        will be running emacses which use --fullname.  */
 417       {"fullname", no_argument, 0, 'f'},
 418       {"f", no_argument, 0, 'f'},
 419
 420       {"annotate", required_argument, 0, OPT_ANNOTATE},
 421       {"help", no_argument, &print_help, 1},
 422       {"se", required_argument, 0, OPT_SE},
 423       {"symbols", required_argument, 0, 's'},
 424       {"s", required_argument, 0, 's'},
 425       {"exec", required_argument, 0, 'e'},
 426       {"e", required_argument, 0, 'e'},
 427       {"core", required_argument, 0, 'c'},
 428       {"c", required_argument, 0, 'c'},
 429       {"pid", required_argument, 0, 'p'},
 430       {"p", required_argument, 0, 'p'},
 431       {"command", required_argument, 0, 'x'},
 432       {"eval-command", required_argument, 0, 'X'},
 433       {"version", no_argument, &print_version, 1},
 434       {"x", required_argument, 0, 'x'},
 435       {"ex", required_argument, 0, 'X'},
 436 #ifdef GDBTK
 437       {"tclcommand", required_argument, 0, 'z'},
 438       {"enable-external-editor", no_argument, 0, 'y'},
 439       {"editor-command", required_argument, 0, 'w'},
 440 #endif
 441       {"ui", required_argument, 0, 'i'},
 442       {"interpreter", required_argument, 0, 'i'},
 443       {"i", required_argument, 0, 'i'},
 444       {"directory", required_argument, 0, 'd'},
 445       {"d", required_argument, 0, 'd'},
 446       {"data-directory", required_argument, 0, 'D'},
 447       {"cd", required_argument, 0, OPT_CD},
 448       {"tty", required_argument, 0, 't'},
 449       {"baud", required_argument, 0, 'b'},
 450       {"b", required_argument, 0, 'b'},
 451       {"nw", no_argument, NULL, OPT_NOWINDOWS},
 452       {"nowindows", no_argument, NULL, OPT_NOWINDOWS},
 453       {"w", no_argument, NULL, OPT_WINDOWS},
 454       {"windows", no_argument, NULL, OPT_WINDOWS},
 455       {"statistics", no_argument, 0, OPT_STATISTICS},
 456       {"write", no_argument, &write_files, 1},
 457       {"args", no_argument, &set_args, 1},
 458       {"l", required_argument, 0, 'l'},
 459       {"return-child-result", no_argument, &return_child_result, 1},
 460       {0, no_argument, 0, 0}
 461     };
 462
 463     while (1)
 464       {
 465         int option_index;
 466
 467         c = getopt_long_only (argc, argv, "",
 468                               long_options, &option_index);
 469         if (c == EOF || set_args)
 470           break;
 471
 472         /* Long option that takes an argument.  */
 473         if (c == 0 && long_options[option_index].flag == 0)
 474           c = long_options[option_index].val;
 475
 476         switch (c)
 477           {
 478           case 0:
 479             /* Long option that just sets a flag.  */
 480             break;
 481           case OPT_SE:
 482             symarg = optarg;
 483             execarg = optarg;
 484             break;
 485           case OPT_CD:
 486             cdarg = optarg;
 487             break;
 488           case OPT_ANNOTATE:
 489             /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
 490             annotation_level = atoi (optarg);
 491             break;
 492           case OPT_STATISTICS:
 493             /* Enable the display of both time and space usage.  */
 494             set_display_time (1);
 495             set_display_space (1);
 496             break;
 497           case OPT_TUI:
 498             /* --tui is equivalent to -i=tui.  */
 499 #ifdef TUI
 500             xfree (interpreter_p);
 501             interpreter_p = xstrdup (INTERP_TUI);
 502 #else
 503             fprintf_unfiltered (gdb_stderr,
 504                                 _("%s: TUI mode is not supported\n"),
 505                                 argv[0]);
 506             exit (1);
 507 #endif
 508             break;
 509           case OPT_WINDOWS:
 510             /* FIXME: cagney/2003-03-01: Not sure if this option is
 511                actually useful, and if it is, what it should do.  */
 512 #ifdef GDBTK
 513             /* --windows is equivalent to -i=insight.  */
 514             xfree (interpreter_p);
 515             interpreter_p = xstrdup (INTERP_INSIGHT);
 516 #endif
 517             use_windows = 1;
 518             break;
 519           case OPT_NOWINDOWS:
 520             /* -nw is equivalent to -i=console.  */
 521             xfree (interpreter_p);
 522             interpreter_p = xstrdup (INTERP_CONSOLE);
 523             use_windows = 0;
 524             break;
 525           case 'f':
 526             annotation_level = 1;
 527             /* We have probably been invoked from emacs.  Disable
 528                window interface.  */
 529             use_windows = 0;
 530             break;
 531           case 's':
 532             symarg = optarg;
 533             break;
 534           case 'e':
 535             execarg = optarg;
 536             break;
 537           case 'c':
 538             corearg = optarg;
 539             break;
 540           case 'p':
 541             pidarg = optarg;
 542             break;
 543           case 'x':
 544             cmdarg[ncmd].type = CMDARG_FILE;
 545             cmdarg[ncmd++].string = optarg;
 546             if (ncmd >= cmdsize)
 547               {
 548                 cmdsize *= 2;
 549                 cmdarg = xrealloc ((char *) cmdarg,
 550                                    cmdsize * sizeof (*cmdarg));
 551               }
 552             break;
 553           case 'X':
 554             cmdarg[ncmd].type = CMDARG_COMMAND;
 555             cmdarg[ncmd++].string = optarg;
 556             if (ncmd >= cmdsize)
 557               {
 558                 cmdsize *= 2;
 559                 cmdarg = xrealloc ((char *) cmdarg,
 560                                    cmdsize * sizeof (*cmdarg));
 561               }
 562             break;
 563           case 'B':
 564             batch_flag = batch_silent = 1;
 565             gdb_stdout = ui_file_new();
 566             break;
 567           case 'D':
 568             xfree (gdb_datadir);
 569             gdb_datadir = xstrdup (optarg);
 570             break;
 571 #ifdef GDBTK
 572           case 'z':
 573             {
 574               extern int gdbtk_test (char *);
 575
 576               if (!gdbtk_test (optarg))
 577                 {
 578                   fprintf_unfiltered (gdb_stderr,
 579                                       _("%s: unable to load "
 580                                         "tclcommand file \"%s\""),
 581                                       argv[0], optarg);
 582                   exit (1);
 583                 }
 584               break;
 585             }
 586           case 'y':
 587             /* Backwards compatibility only.  */
 588             break;
 589           case 'w':
 590             {
 591               external_editor_command = xstrdup (optarg);
 592               break;
 593             }
 594 #endif /* GDBTK */
 595           case 'i':
 596             xfree (interpreter_p);
 597             interpreter_p = xstrdup (optarg);
 598             break;
 599           case 'd':
 600             dirarg[ndir++] = optarg;
 601             if (ndir >= dirsize)
 602               {
 603                 dirsize *= 2;
 604                 dirarg = (char **) xrealloc ((char *) dirarg,
 605                                              dirsize * sizeof (*dirarg));
 606               }
 607             break;
 608           case 't':
 609             ttyarg = optarg;
 610             break;
 611           case 'q':
 612             quiet = 1;
 613             break;
 614           case 'b':
 615             {
 616               int i;
 617               char *p;
 618
 619               i = strtol (optarg, &p, 0);
 620               if (i == 0 && p == optarg)
 621
 622                 /* Don't use *_filtered or warning() (which relies on
 623                    current_target) until after initialize_all_files().  */
 624
 625                 fprintf_unfiltered
 626                   (gdb_stderr,
 627                    _("warning: could not set baud rate to `%s'.\n"), optarg);
 628               else
 629                 baud_rate = i;
 630             }
 631             break;
 632           case 'l':
 633             {
 634               int i;
 635               char *p;
 636
 637               i = strtol (optarg, &p, 0);
 638               if (i == 0 && p == optarg)
 639
 640                 /* Don't use *_filtered or warning() (which relies on
 641                    current_target) until after initialize_all_files().  */
 642
 643                 fprintf_unfiltered (gdb_stderr,
 644                                     _("warning: could not set "
 645                                       "timeout limit to `%s'.\n"), optarg);
 646               else
 647                 remote_timeout = i;
 648             }
 649             break;
 650
 651           case '?':
 652             fprintf_unfiltered (gdb_stderr,
 653                                 _("Use `%s --help' for a "
 654                                   "complete list of options.\n"),
 655                                 argv[0]);
 656             exit (1);
 657           }
 658       }
 659
 660     /* If --help or --version, disable window interface.  */
 661     if (print_help || print_version)
 662       {
 663         use_windows = 0;
 664       }
 665
 666     if (batch_flag)
 667       quiet = 1;
 668   }
 669
 670   /* Initialize all files.  Give the interpreter a chance to take
 671      control of the console via the deprecated_init_ui_hook ().  */
 672   gdb_init (argv[0]);
 673
 674   /* Now that gdb_init has created the initial inferior, we're in
 675      position to set args for that inferior.  */
 676   if (set_args)
 677     {
 678       /* The remaining options are the command-line options for the
 679          inferior.  The first one is the sym/exec file, and the rest
 680          are arguments.  */
 681       if (optind >= argc)
 682         {
 683           fprintf_unfiltered (gdb_stderr,
 684                               _("%s: `--args' specified but "
 685                                 "no program specified\n"),
 686                               argv[0]);
 687           exit (1);
 688         }
 689       symarg = argv[optind];
 690       execarg = argv[optind];
 691       ++optind;
 692       set_inferior_args_vector (argc - optind, &argv[optind]);
 693     }
 694   else
 695     {
 696       /* OK, that's all the options.  */
 697
 698       /* The first argument, if specified, is the name of the
 699          executable.  */
 700       if (optind < argc)
 701         {
 702           symarg = argv[optind];
 703           execarg = argv[optind];
 704           optind++;
 705         }
 706
 707       /* If the user hasn't already specified a PID or the name of a
 708          core file, then a second optional argument is allowed.  If
 709          present, this argument should be interpreted as either a
 710          PID or a core file, whichever works.  */
 711       if (pidarg == NULL && corearg == NULL && optind < argc)
 712         {
 713           pid_or_core_arg = argv[optind];
 714           optind++;
 715         }
 716
 717       /* Any argument left on the command line is unexpected and
 718          will be ignored.  Inform the user.  */
 719       if (optind < argc)
 720         fprintf_unfiltered (gdb_stderr,
 721                             _("Excess command line "
 722                               "arguments ignored. (%s%s)\n"),
 723                             argv[optind],
 724                             (optind == argc - 1) ? "" : " ...");
 725     }
 726
 727   /* Lookup gdbinit files.  Note that the gdbinit file name may be
 728      overriden during file initialization, so get_init_files should be
 729      called after gdb_init.  */
 730   get_init_files (&system_gdbinit, &home_gdbinit, &local_gdbinit);
 731
 732   /* Do these (and anything which might call wrap_here or *_filtered)
 733      after initialize_all_files() but before the interpreter has been
 734      installed.  Otherwize the help/version messages will be eaten by
 735      the interpreter's output handler.  */
 736
 737   if (print_version)
 738     {
 739       print_gdb_version (gdb_stdout);
 740       wrap_here ("");
 741       printf_filtered ("\n");
 742       exit (0);
 743     }
 744
 745   if (print_help)
 746     {
 747       print_gdb_help (gdb_stdout);
 748       fputs_unfiltered ("\n", gdb_stdout);
 749       exit (0);
 750     }
 751
 752   /* FIXME: cagney/2003-02-03: The big hack (part 1 of 2) that lets
 753      GDB retain the old MI1 interpreter startup behavior.  Output the
 754      copyright message before the interpreter is installed.  That way
 755      it isn't encapsulated in MI output.  */
 756   if (!quiet && strcmp (interpreter_p, INTERP_MI1) == 0)
 757     {
 758       /* Print all the junk at the top, with trailing "..." if we are
 759          about to read a symbol file (possibly slowly).  */
 760       print_gdb_version (gdb_stdout);
 761       if (symarg)
 762         printf_filtered ("..");
 763       wrap_here ("");
 764       printf_filtered ("\n");
 765       gdb_flush (gdb_stdout);   /* Force to screen during slow
 766                                    operations.  */
 767     }
 768
 769   /* Install the default UI.  All the interpreters should have had a
 770      look at things by now.  Initialize the default interpreter.  */
 771
 772   {
 773     /* Find it.  */
 774     struct interp *interp = interp_lookup (interpreter_p);
 775
 776     if (interp == NULL)
 777       error (_("Interpreter `%s' unrecognized"), interpreter_p);
 778     /* Install it.  */
 779     if (!interp_set (interp, 1))
 780       {
 781         fprintf_unfiltered (gdb_stderr,
 782                             "Interpreter `%s' failed to initialize.\n",
 783                             interpreter_p);
 784         exit (1);
 785       }
 786   }
 787
 788   /* FIXME: cagney/2003-02-03: The big hack (part 2 of 2) that lets
 789      GDB retain the old MI1 interpreter startup behavior.  Output the
 790      copyright message after the interpreter is installed when it is
 791      any sane interpreter.  */
 792   if (!quiet && !current_interp_named_p (INTERP_MI1))
 793     {
 794       /* Print all the junk at the top, with trailing "..." if we are
 795          about to read a symbol file (possibly slowly).  */
 796       print_gdb_version (gdb_stdout);
 797       if (symarg)
 798         printf_filtered ("..");
 799       wrap_here ("");
 800       printf_filtered ("\n");
 801       gdb_flush (gdb_stdout);   /* Force to screen during slow
 802                                    operations.  */
 803     }
 804
 805   /* Set off error and warning messages with a blank line.  */
 806   error_pre_print = "\n";
 807   quit_pre_print = error_pre_print;
 808   warning_pre_print = _("\nwarning: ");
 809
 810   /* Read and execute the system-wide gdbinit file, if it exists.
 811      This is done *before* all the command line arguments are
 812      processed; it sets global parameters, which are independent of
 813      what file you are debugging or what directory you are in.  */
 814   if (system_gdbinit && !inhibit_gdbinit)
 815     catch_command_errors (source_script, system_gdbinit, 0, RETURN_MASK_ALL);
 816
 817   /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
 818      *before* all the command line arguments are processed; it sets
 819      global parameters, which are independent of what file you are
 820      debugging or what directory you are in.  */
 821
 822   if (home_gdbinit && !inhibit_gdbinit)
 823     catch_command_errors (source_script, home_gdbinit, 0, RETURN_MASK_ALL);
 824
 825   /* Now perform all the actions indicated by the arguments.  */
 826   if (cdarg != NULL)
 827     {
 828       catch_command_errors (cd_command, cdarg, 0, RETURN_MASK_ALL);
 829     }
 830
 831   for (i = 0; i < ndir; i++)
 832     catch_command_errors (directory_switch, dirarg[i], 0, RETURN_MASK_ALL);
 833   xfree (dirarg);
 834
 835   /* Skip auto-loading section-specified scripts until we've sourced
 836      local_gdbinit (which is often used to augment the source search
 837      path).  */
 838   save_auto_load = gdbpy_global_auto_load;
 839   gdbpy_global_auto_load = 0;
 840
 841   if (execarg != NULL
 842       && symarg != NULL
 843       && strcmp (execarg, symarg) == 0)
 844     {
 845       /* The exec file and the symbol-file are the same.  If we can't
 846          open it, better only print one error message.
 847          catch_command_errors returns non-zero on success!  */
 848       if (catch_command_errors (exec_file_attach, execarg,
 849                                 !batch_flag, RETURN_MASK_ALL))
 850         catch_command_errors (symbol_file_add_main, symarg,
 851                               !batch_flag, RETURN_MASK_ALL);
 852     }
 853   else
 854     {
 855       if (execarg != NULL)
 856         catch_command_errors (exec_file_attach, execarg,
 857                               !batch_flag, RETURN_MASK_ALL);
 858       if (symarg != NULL)
 859         catch_command_errors (symbol_file_add_main, symarg,
 860                               !batch_flag, RETURN_MASK_ALL);
 861     }
 862
 863   if (corearg && pidarg)
 864     error (_("Can't attach to process and specify "
 865              "a core file at the same time."));
 866
 867   if (corearg != NULL)
 868     catch_command_errors (core_file_command, corearg,
 869                           !batch_flag, RETURN_MASK_ALL);
 870   else if (pidarg != NULL)
 871     catch_command_errors (attach_command, pidarg,
 872                           !batch_flag, RETURN_MASK_ALL);
 873   else if (pid_or_core_arg)
 874     {
 875       /* The user specified 'gdb program pid' or gdb program core'.
 876          If pid_or_core_arg's first character is a digit, try attach
 877          first and then corefile.  Otherwise try just corefile.  */
 878
 879       if (isdigit (pid_or_core_arg[0]))
 880         {
 881           if (catch_command_errors (attach_command, pid_or_core_arg,
 882                                     !batch_flag, RETURN_MASK_ALL) == 0)
 883             catch_command_errors (core_file_command, pid_or_core_arg,
 884                                   !batch_flag, RETURN_MASK_ALL);
 885         }
 886       else /* Can't be a pid, better be a corefile.  */
 887         catch_command_errors (core_file_command, pid_or_core_arg,
 888                               !batch_flag, RETURN_MASK_ALL);
 889     }
 890
 891   if (ttyarg != NULL)
 892     set_inferior_io_terminal (ttyarg);
 893
 894   /* Error messages should no longer be distinguished with extra output.  */
 895   error_pre_print = NULL;
 896   quit_pre_print = NULL;
 897   warning_pre_print = _("warning: ");
 898
 899   /* Read the .gdbinit file in the current directory, *if* it isn't
 900      the same as the $HOME/.gdbinit file (it should exist, also).  */
 901   if (local_gdbinit && !inhibit_gdbinit)
 902     catch_command_errors (source_script, local_gdbinit, 0, RETURN_MASK_ALL);
 903
 904   /* Now that all .gdbinit's have been read and all -d options have been
 905      processed, we can read any scripts mentioned in SYMARG.
 906      We wait until now because it is common to add to the source search
 907      path in local_gdbinit.  */
 908   gdbpy_global_auto_load = save_auto_load;
 909   ALL_OBJFILES (objfile)
 910     load_auto_scripts_for_objfile (objfile);
 911
 912   for (i = 0; i < ncmd; i++)
 913     {
 914       if (cmdarg[i].type == CMDARG_FILE)
 915         catch_command_errors (source_script, cmdarg[i].string,
 916                               !batch_flag, RETURN_MASK_ALL);
 917       else  /* cmdarg[i].type == CMDARG_COMMAND */
 918         catch_command_errors (execute_command, cmdarg[i].string,
 919                               !batch_flag, RETURN_MASK_ALL);
 920     }
 921   xfree (cmdarg);
 922
 923   /* Read in the old history after all the command files have been
 924      read.  */
 925   init_history ();
 926
 927   if (batch_flag)
 928     {
 929       /* We have hit the end of the batch file.  */
 930       quit_force (NULL, 0);
 931     }
 932
 933   /* Show time and/or space usage.  */
 934   do_cleanups (pre_stat_chain);
 935
 936   /* NOTE: cagney/1999-11-07: There is probably no reason for not
 937      moving this loop and the code found in captured_command_loop()
 938      into the command_loop() proper.  The main thing holding back that
 939      change - SET_TOP_LEVEL() - has been eliminated.  */
 940   while (1)
 941     {
 942       catch_errors (captured_command_loop, 0, "", RETURN_MASK_ALL);
 943     }
 944   /* No exit -- exit is through quit_command.  */
 945 }
 946
 947 int
 948 gdb_main (struct captured_main_args *args)
 949 {
 950   use_windows = args->use_windows;
 951   catch_errors (captured_main, args, "", RETURN_MASK_ALL);
 952   /* The only way to end up here is by an error (normal exit is
 953      handled by quit_force()), hence always return an error status.  */
 954   return 1;
 955 }
 956
 957
 958 /* Don't use *_filtered for printing help.  We don't want to prompt
 959    for continue no matter how small the screen or how much we're going
 960    to print.  */
 961
 962 static void
 963 print_gdb_help (struct ui_file *stream)
 964 {
 965   char *system_gdbinit;
 966   char *home_gdbinit;
 967   char *local_gdbinit;
 968
 969   get_init_files (&system_gdbinit, &home_gdbinit, &local_gdbinit);
 970
 971   fputs_unfiltered (_("\
 972 This is the GNU debugger.  Usage:\n\n\
 973     gdb [options] [executable-file [core-file or process-id]]\n\
 974     gdb [options] --args executable-file [inferior-arguments ...]\n\n\
 975 Options:\n\n\
 976 "), stream);
 977   fputs_unfiltered (_("\
 978   --args             Arguments after executable-file are passed to inferior\n\
 979 "), stream);
 980   fputs_unfiltered (_("\
 981   -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
 982   --batch            Exit after processing options.\n\
 983   --batch-silent     As for --batch, but suppress all gdb stdout output.\n\
 984   --return-child-result\n\
 985                      GDB exit code will be the child's exit code.\n\
 986   --cd=DIR           Change current directory to DIR.\n\
 987   --command=FILE, -x Execute GDB commands from FILE.\n\
 988   --eval-command=COMMAND, -ex\n\
 989                      Execute a single GDB command.\n\
 990                      May be used multiple times and in conjunction\n\
 991                      with --command.\n\
 992   --core=COREFILE    Analyze the core dump COREFILE.\n\
 993   --pid=PID          Attach to running process PID.\n\
 994 "), stream);
 995   fputs_unfiltered (_("\
 996   --dbx              DBX compatibility mode.\n\
 997   --directory=DIR    Search for source files in DIR.\n\
 998   --epoch            Output information used by epoch emacs-GDB interface.\n\
 999   --exec=EXECFILE    Use EXECFILE as the executable.\n\
1000   --fullname         Output information used by emacs-GDB interface.\n\
1001   --help             Print this message.\n\
1002 "), stream);
1003   fputs_unfiltered (_("\
1004   --interpreter=INTERP\n\
1005                      Select a specific interpreter / user interface\n\
1006 "), stream);
1007   fputs_unfiltered (_("\
1008   -l TIMEOUT         Set timeout in seconds for remote debugging.\n\
1009   --nw               Do not use a window interface.\n\
1010   --nx               Do not read "), stream);
1011   fputs_unfiltered (gdbinit, stream);
1012   fputs_unfiltered (_(" file.\n\
1013   --quiet            Do not print version number on startup.\n\
1014   --readnow          Fully read symbol files on first access.\n\
1015 "), stream);
1016   fputs_unfiltered (_("\
1017   --se=FILE          Use FILE as symbol file and executable file.\n\
1018   --symbols=SYMFILE  Read symbols from SYMFILE.\n\
1019   --tty=TTY          Use TTY for input/output by the program being debugged.\n\
1020 "), stream);
1021 #if defined(TUI)
1022   fputs_unfiltered (_("\
1023   --tui              Use a terminal user interface.\n\
1024 "), stream);
1025 #endif
1026   fputs_unfiltered (_("\
1027   --version          Print version information and then exit.\n\
1028   -w                 Use a window interface.\n\
1029   --write            Set writing into executable and core files.\n\
1030   --xdb              XDB compatibility mode.\n\
1031 "), stream);
1032   fputs_unfiltered (_("\n\
1033 At startup, GDB reads the following init files and executes their commands:\n\
1034 "), stream);
1035   if (system_gdbinit)
1036     fprintf_unfiltered (stream, _("\
1037    * system-wide init file: %s\n\
1038 "), system_gdbinit);
1039   if (home_gdbinit)
1040     fprintf_unfiltered (stream, _("\
1041    * user-specific init file: %s\n\
1042 "), home_gdbinit);
1043   if (local_gdbinit)
1044     fprintf_unfiltered (stream, _("\
1045    * local init file: ./%s\n\
1046 "), local_gdbinit);
1047   fputs_unfiltered (_("\n\
1048 For more information, type \"help\" from within GDB, or consult the\n\
1049 GDB manual (available as on-line info or a printed manual).\n\
1050 "), stream);
1051   if (REPORT_BUGS_TO[0] && stream == gdb_stdout)
1052     fprintf_unfiltered (stream, _("\
1053 Report bugs to \"%s\".\n\
1054 "), REPORT_BUGS_TO);
1055 }