/* Top level for GDB, the GNU debugger. Copyright (C) 1986, 1987, 1988, 1989, 1990 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include int fclose (); #include "defs.h" #include "gdbcmd.h" #include "param.h" #include "symtab.h" #include "inferior.h" #include "signals.h" #include "target.h" #include "breakpoint.h" #include "getopt.h" /* readline include files */ #include "readline.h" #include "history.h" /* readline defines this. */ #undef savestring #ifdef USG #include #include #endif #include #include #include #include #include #include #ifdef SET_STACK_LIMIT_HUGE #include #include int original_stack_limit; #endif /* If this definition isn't overridden by the header files, assume that isatty and fileno exist on this system. */ #ifndef ISATTY #define ISATTY(FP) (isatty (fileno (FP))) #endif /* Initialization file name for gdb. This is overridden in some configs. */ #ifndef GDBINIT_FILENAME #define GDBINIT_FILENAME ".gdbinit" #endif char gdbinit[] = GDBINIT_FILENAME; #define ALL_CLEANUPS ((struct cleanup *)0) /* Version number of GDB, as a string. */ extern char *version; /* Flag for whether we want all the "from_tty" gubbish printed. */ int caution = 1; /* Default is yes, sigh. */ /* * Define all cmd_list_element's */ /* Chain containing all defined commands. */ struct cmd_list_element *cmdlist; /* Chain containing all defined info subcommands. */ struct cmd_list_element *infolist; /* Chain containing all defined enable subcommands. */ struct cmd_list_element *enablelist; /* Chain containing all defined disable subcommands. */ struct cmd_list_element *disablelist; /* Chain containing all defined delete subcommands. */ struct cmd_list_element *deletelist; /* Chain containing all defined "enable breakpoint" subcommands. */ struct cmd_list_element *enablebreaklist; /* Chain containing all defined set subcommands */ struct cmd_list_element *setlist; /* Chain containing all defined show subcommands. */ struct cmd_list_element *showlist; /* Chain containing all defined \"set history\". */ struct cmd_list_element *sethistlist; /* Chain containing all defined \"show history\". */ struct cmd_list_element *showhistlist; /* Chain containing all defined \"unset history\". */ struct cmd_list_element *unsethistlist; /* stdio stream that command input is being read from. */ FILE *instream; /* Current working directory. */ char *current_directory; /* The directory name is actually stored here (usually). */ static char dirbuf[MAXPATHLEN]; /* Function to call before reading a command, if nonzero. The function receives two args: an input stream, and a prompt string. */ void (*window_hook) (); extern int frame_file_full_name; int epoch_interface; int xgdb_verbose; /* The external commands we call... */ extern void init_source_path (); extern void directory_command (); extern void exec_file_command (); extern void symbol_file_command (); extern void core_file_command (); extern void tty_command (); extern void help_list (); extern void initialize_all_files (); extern void init_malloc (); /* Forward declarations for this file */ void free_command_lines (); char *gdb_readline (); char *command_line_input (); static void initialize_main (); static void initialize_cmd_lists (); static void init_signals (); static void quit_command (); void command_loop (); static void source_command (); static void print_gdb_version (); static void float_handler (); static void cd_command (); static void read_command_file (); char *getenv (); /* gdb prints this when reading a command interactively */ static char *prompt; /* Buffer used for reading command lines, and the size allocated for it so far. */ char *line; int linesize = 100; /* Baud rate specified for talking to serial target systems. Default is left as a zero pointer, so targets can choose their own defaults. */ char *baud_rate; /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */ #ifndef STOP_SIGNAL #ifdef SIGTSTP #define STOP_SIGNAL SIGTSTP #endif #endif /* Some System V have job control but not sigsetmask(). */ #if !defined (HAVE_SIGSETMASK) #define HAVE_SIGSETMASK !defined (USG) #endif #if !HAVE_SIGSETMASK #define sigsetmask(n) #endif /* This is how `error' returns to command level. */ jmp_buf to_top_level; void return_to_top_level () { quit_flag = 0; immediate_quit = 0; bpstat_clear_actions(stop_bpstat); /* Clear queued breakpoint commands */ clear_momentary_breakpoints (); disable_current_display (); do_cleanups (ALL_CLEANUPS); longjmp (to_top_level, 1); } /* Call FUNC with arg ARGS, catching any errors. If there is no error, return the value returned by FUNC. If there is an error, return zero after printing ERRSTRING (which is in addition to the specific error message already printed). */ int catch_errors (func, args, errstring) int (*func) (); int args; char *errstring; { jmp_buf saved; int val; struct cleanup *saved_cleanup_chain; saved_cleanup_chain = save_cleanups (); bcopy (to_top_level, saved, sizeof (jmp_buf)); if (setjmp (to_top_level) == 0) val = (*func) (args); else { if (errstring) fprintf (stderr, "%s\n", errstring); val = 0; } restore_cleanups (saved_cleanup_chain); bcopy (saved, to_top_level, sizeof (jmp_buf)); return val; } /* Handler for SIGHUP. */ static void disconnect () { kill_inferior_fast (); signal (SIGHUP, SIG_DFL); kill (getpid (), SIGHUP); } /* Clean up on error during a "source" command (or execution of a user-defined command). */ static void source_cleanup (stream) FILE *stream; { /* Restore the previous input stream. */ instream = stream; } /* Read commands from STREAM. */ static void read_command_file (stream) FILE *stream; { struct cleanup *cleanups; cleanups = make_cleanup (source_cleanup, instream); instream = stream; command_loop (); do_cleanups (cleanups); } int main (argc, argv) int argc; char **argv; { int count; static int inhibit_gdbinit = 0; static int quiet = 0; static int batch = 0; /* Pointers to various arguments from command line. */ char *symarg = NULL; char *execarg = NULL; char *corearg = NULL; char *cdarg = NULL; char *ttyarg = NULL; /* 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; register int i; /* This needs to happen before the first use of malloc. */ init_malloc (); #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; getwd (dirbuf); current_directory = dirbuf; #ifdef SET_STACK_LIMIT_HUGE { struct rlimit rlim; /* Set the stack limit huge so that alloca (particularly stringtab * in dbxread.c) does not fail. */ getrlimit (RLIMIT_STACK, &rlim); original_stack_limit = rlim.rlim_cur; rlim.rlim_cur = rlim.rlim_max; setrlimit (RLIMIT_STACK, &rlim); } #endif /* SET_STACK_LIMIT_HUGE */ /* Parse arguments and options. */ { int c; static int print_help; /* 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). */ static struct option long_options[] = { {"quiet", 0, &quiet, 1}, {"nx", 0, &inhibit_gdbinit, 1}, {"batch", 0, &batch, 1}, {"epoch", 0, &epoch_interface, 1}, {"fullname", 0, &frame_file_full_name, 1}, {"help", 0, &print_help, 1}, {"se", 1, 0, 10}, {"symbols", 1, 0, 's'}, {"s", 1, 0, 's'}, {"exec", 1, 0, 'e'}, {"core", 1, 0, 'c'}, {"c", 1, 0, 'c'}, {"command", 1, 0, 'x'}, {"x", 1, 0, 'x'}, {"directory", 1, 0, 'd'}, {"cd", 1, 0, 11}, {"tty", 1, 0, 't'}, {"b", 1, 0, 'b'}, /* Allow machine descriptions to add more options... */ #ifdef ADDITIONAL_OPTIONS ADDITIONAL_OPTIONS #endif }; while (1) { c = getopt_long_only (argc, argv, "", long_options, &option_index); if (c == EOF) 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 10: symarg = optarg; execarg = optarg; break; case 11: cdarg = optarg; break; case 's': symarg = optarg; break; case 'e': execarg = optarg; break; case 'c': corearg = optarg; break; case 'x': cmdarg[ncmd++] = optarg; if (ncmd >= cmdsize) { cmdsize *= 2; cmdarg = (char **) xrealloc ((char *)cmdarg, cmdsize * sizeof (*cmdarg)); } 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': baud_rate = optarg; break; #ifdef ADDITIONAL_OPTION_CASES ADDITIONAL_OPTION_CASES #endif case '?': fprintf (stderr, "Use `%s +help' for a complete list of options.\n", argv[0]); exit (1); } } if (print_help) { fputs ("\ This is GDB, the GNU debugger. Use the command\n\ gdb [options] [executable [core-file]]\n\ to enter the debugger.\n\ \n\ Options available are:\n\ -help Print this message.\n\ -quiet Do not print version number on startup.\n\ -fullname Output information used by emacs-GDB interface.\n\ -epoch Output information used by epoch emacs-GDB interface.\n\ -batch Exit after processing options.\n\ -nx Do not read .gdbinit file.\n\ -tty=TTY Use TTY for input/output by the program being debugged.\n\ -cd=DIR Change current directory to DIR.\n\ -directory=DIR Search for source files in DIR.\n\ -command=FILE Execute GDB commands from FILE.\n\ -symbols=SYMFILE Read symbols from SYMFILE.\n\ -exec=EXECFILE Use EXECFILE as the executable.\n\ -se=FILE Use FILE as symbol file and executable file.\n\ -core=COREFILE Analyze the core dump COREFILE.\n\ -b BAUDRATE Set serial port baud rate used for remote debugging\n\ ", stderr); #ifdef ADDITIONAL_OPTION_HELP fputs (ADDITIONAL_OPTION_HELP, stderr); #endif fputs ("\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", stderr); /* Exiting after printing this message seems like the most useful thing to do. */ exit (0); } /* 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: corearg = argv[optind]; break; case 3: fprintf (stderr, "Excess command line arguments ignored. (%s%s)\n", argv[optind], (optind == argc - 1) ? "" : " ..."); break; } if (batch) quiet = 1; } /* Run the init function of each source file */ initialize_cmd_lists (); /* This needs to be done first */ initialize_all_files (); initialize_main (); /* But that omits this file! Do it now */ init_signals (); if (!quiet) { /* Print all the junk in one place, with a blank line after it to separate it from important stuff like "no such file". Also, we skip most of the noise, like Emacs, if started with a file name rather than with no arguments. */ if (execarg == 0) { print_gdb_version (1); printf ("Type \"help\" for a list of commands.\n\n"); } } /* Now perform all the actions indicated by the arguments. */ if (cdarg != NULL) { if (!setjmp (to_top_level)) { cd_command (cdarg, 0); init_source_path (); } } do_cleanups (ALL_CLEANUPS); for (i = 0; i < ndir; i++) if (!setjmp (to_top_level)) directory_command (dirarg[i], 0); free (dirarg); do_cleanups (ALL_CLEANUPS); 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. */ if (!setjmp (to_top_level)) { exec_file_command (execarg, !batch); symbol_file_command (symarg, !batch); } } else { if (execarg != NULL) if (!setjmp (to_top_level)) exec_file_command (execarg, !batch); if (symarg != NULL) if (!setjmp (to_top_level)) symbol_file_command (symarg, !batch); } do_cleanups (ALL_CLEANUPS); if (corearg != NULL) if (!setjmp (to_top_level)) core_file_command (corearg, !batch); else if (isdigit (corearg[0]) && !setjmp (to_top_level)) attach_command (corearg, !batch); do_cleanups (ALL_CLEANUPS); if (ttyarg != NULL) if (!setjmp (to_top_level)) tty_command (ttyarg, !batch); do_cleanups (ALL_CLEANUPS); #ifdef ADDITIONAL_OPTION_HANDLER ADDITIONAL_OPTION_HANDLER; #endif { struct stat homebuf, cwdbuf; char *homedir, *homeinit; /* Read init file, if it exists in home directory */ homedir = getenv ("HOME"); if (homedir) { homeinit = (char *) alloca (strlen (getenv ("HOME")) + strlen (gdbinit) + 10); strcpy (homeinit, getenv ("HOME")); strcat (homeinit, "/"); strcat (homeinit, gdbinit); if (!inhibit_gdbinit && access (homeinit, R_OK) == 0) if (!setjmp (to_top_level)) source_command (homeinit, 0); do_cleanups (ALL_CLEANUPS); /* 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). */ bzero (&homebuf, sizeof (struct stat)); bzero (&cwdbuf, sizeof (struct stat)); stat (homeinit, &homebuf); stat (gdbinit, &cwdbuf); /* We'll only need this if homedir was set. */ } /* Read the input file in the current directory, *if* it isn't the same file (it should exist, also). */ if (!homedir || bcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat))) if (!inhibit_gdbinit && access (gdbinit, R_OK) == 0) if (!setjmp (to_top_level)) source_command (gdbinit, 0); do_cleanups (ALL_CLEANUPS); } for (i = 0; i < ncmd; i++) if (!setjmp (to_top_level)) { if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0') read_command_file (stdin); else source_command (cmdarg[i], !batch); do_cleanups (ALL_CLEANUPS); } free (cmdarg); 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 /* The command loop. */ while (1) { if (!setjmp (to_top_level)) { do_cleanups (ALL_CLEANUPS); /* Do complete cleanup */ command_loop (); quit_command ((char *)0, instream == stdin); } } /* No exit -- exit is through quit_command. */ } /* Execute the line P as a command. Pass FROM_TTY as second argument to the defining function. */ void execute_command (p, from_tty) char *p; int from_tty; { register struct cmd_list_element *c; register struct command_line *cmdlines; free_all_values (); /* This can happen when command_line_input hits end of file. */ if (p == NULL) return; while (*p == ' ' || *p == '\t') p++; if (*p) { char *arg; c = lookup_cmd (&p, cmdlist, "", 0, 1); /* Pass null arg rather than an empty one. */ arg = *p ? p : 0; if (c->class == class_user) { struct cleanup *old_chain; if (*p) error ("User-defined commands cannot take arguments."); cmdlines = c->user_commands; if (cmdlines == 0) /* Null command */ return; /* Set the instream to 0, indicating execution of a user-defined function. */ old_chain = make_cleanup (source_cleanup, instream); instream = (FILE *) 0; while (cmdlines) { execute_command (cmdlines->line, 0); cmdlines = cmdlines->next; } do_cleanups (old_chain); } else if (c->type == set_cmd || c->type == show_cmd) do_setshow_command (arg, from_tty & caution, c); else if (c->function == NO_FUNCTION) error ("That is not a command, just a help topic."); else (*c->function) (arg, from_tty & caution); } } /* ARGSUSED */ void command_loop_marker (foo) int foo; { } /* Read commands from `instream' and execute them until end of file or error reading instream. */ void command_loop () { struct cleanup *old_chain; char *command; int stdin_is_tty = ISATTY (stdin); while (!feof (instream)) { if (window_hook && instream == stdin) (*window_hook) (instream, prompt); quit_flag = 0; if (instream == stdin && stdin_is_tty) reinitialize_more_filter (); old_chain = make_cleanup (command_loop_marker, 0); command = command_line_input (instream == stdin ? prompt : 0, instream == stdin); if (command == 0) return; execute_command (command, instream == stdin); /* Do any commands attached to breakpoint we stopped at. */ bpstat_do_actions (&stop_bpstat); do_cleanups (old_chain); } } /* Commands call this if they do not want to be repeated by null lines. */ void dont_repeat () { /* If we aren't reading from standard input, we are saving the last thing read from stdin in line and don't want to delete it. Null lines won't repeat here in any case. */ if (instream == stdin) *line = 0; } /* Read a line from the stream "instream" without command line editing. It prints PRROMPT once at the start. If RETURN_RESULT is set it allocates space for whatever the user types and returns the result. If not, it just discards what the user types and returns a garbage non-NULL value. No matter what return_result is, a NULL return means end of file. */ char * gdb_readline (prrompt, return_result) char *prrompt; int return_result; { int c; char *result; int input_index = 0; int result_size = 80; if (prrompt) { printf (prrompt); fflush (stdout); } if (return_result) result = (char *) xmalloc (result_size); while (1) { /* Read from stdin if we are executing a user defined command. This is the right thing for prompt_for_continue, at least. */ c = fgetc (instream ? instream : stdin); if (c == EOF || c == '\n') break; if (return_result) { result[input_index++] = c; while (input_index >= result_size) { result_size *= 2; result = (char *) xrealloc (result, result_size); } } } if (c == EOF) { if (return_result) free (result); return NULL; } if (return_result) { result[input_index++] = '\0'; return result; } else /* Return any old non-NULL pointer. */ return (char *) "non-NULL"; } /* Declaration for fancy readline with command line editing. */ char *readline (); /* Variables which control command line editing and history substitution. These variables are given default values at the end of this file. */ static int command_editing_p; static int history_expansion_p; static int write_history_p; static int history_size; static char *history_filename; /* Variables which are necessary for fancy command line editing. */ char *gdb_completer_word_break_characters = " \t\n!@#$%^&*()-+=|~`}{[]\"';:?/>.<,"; /* Functions that are used as part of the fancy command line editing. */ /* This can be used for functions which don't want to complete on symbols but don't want to complete on anything else either. */ /* ARGSUSED */ char ** noop_completer (text) char *text; { return NULL; } /* Generate symbol names one by one for the completer. If STATE is zero, then we need to initialize, otherwise the initialization has already taken place. TEXT is what we expect the symbol to start with. RL_LINE_BUFFER is available to be looked at; it contains the entire text of the line. RL_POINT is the offset in that line of the cursor. You should pretend that the line ends at RL_POINT. The result is NULL if there are no more completions, else a char string which is a possible completion. */ char * symbol_completion_function (text, state) char *text; int state; { static char **list = (char **)NULL; static int index; char *output; extern char *rl_line_buffer; extern int rl_point; char *tmp_command, *p; struct cmd_list_element *c, *result_list; if (!state) { /* Free the storage used by LIST, but not by the strings inside. This is because rl_complete_internal () frees the strings. */ if (list) free (list); list = 0; index = 0; /* Decide whether to complete on a list of gdb commands or on symbols. */ tmp_command = (char *) alloca (rl_point + 1); p = tmp_command; strncpy (tmp_command, rl_line_buffer, rl_point); tmp_command[rl_point] = '\0'; if (rl_point == 0) { /* An empty line we want to consider ambiguous; that is, it could be any command. */ c = (struct cmd_list_element *) -1; result_list = 0; } else c = lookup_cmd_1 (&p, cmdlist, &result_list, 1); /* Move p up to the next interesting thing. */ while (*p == ' ' || *p == '\t') p++; if (!c) /* He's typed something unrecognizable. Sigh. */ list = (char **) 0; else if (c == (struct cmd_list_element *) -1) { /* If we didn't recognize everything up to the thing that needs completing, and we don't know what command it is yet, we are in trouble. Part of the trouble might be that the list of delimiters used by readline includes '-', which we use in commands. Check for this. */ if (p + strlen(text) != tmp_command + rl_point) { if (tmp_command[rl_point - strlen(text) - 1] == '-') text = p; else { /* This really should not produce an error. Better would be to pretend to hit RETURN here; this would produce a response like "Ambiguous command: foo, foobar, etc", and leave the line available for re-entry with ^P. Instead, this error blows away the user's typed input without any way to get it back. */ error (" Unrecognized command."); } } /* He's typed something ambiguous. This is easier. */ if (result_list) list = complete_on_cmdlist (*result_list->prefixlist, text); else list = complete_on_cmdlist (cmdlist, text); } else { /* If we've gotten this far, gdb has recognized a full command. There are several possibilities: 1) We need to complete on the command. 2) We need to complete on the possibilities coming after the command. 2) We need to complete the text of what comes after the command. */ if (!*p && *text) /* Always (might be longer versions of thie command). */ list = complete_on_cmdlist (result_list, text); else if (!*p && !*text) { if (c->prefixlist) list = complete_on_cmdlist (*c->prefixlist, ""); else list = (*c->completer) (""); } else { if (c->prefixlist && !c->allow_unknown) { #if 0 /* Something like "info adsfkdj". But error() is not the proper response; just return no completions instead. */ *p = '\0'; error ("\"%s\" command requires a subcommand.", tmp_command); #else list = NULL; #endif } else list = (*c->completer) (text); } } } /* If the debugged program wasn't compiled with symbols, or if we're clearly completing on a command and no command matches, return NULL. */ if (!list) return ((char *)NULL); output = list[index]; if (output) index++; return (output); } #ifdef STOP_SIGNAL static void stop_sig () { #if STOP_SIGNAL == SIGTSTP signal (SIGTSTP, SIG_DFL); sigsetmask (0); kill (getpid (), SIGTSTP); signal (SIGTSTP, stop_sig); #else signal (STOP_SIGNAL, stop_sig); #endif printf ("%s", prompt); fflush (stdout); /* Forget about any previous command -- null line now will do nothing. */ dont_repeat (); } #endif /* STOP_SIGNAL */ #if 0 Writing the history file upon a terminating signal is not useful, because the info is rarely relevant and is in the core dump anyway. It is an annoyance to have the file cluttering up the place. /* The list of signals that would terminate us if not caught. We catch them, but just so that we can write the history file, and so forth. */ int terminating_signals[] = { SIGHUP, SIGINT, SIGILL, SIGTRAP, SIGIOT, SIGEMT, SIGFPE, SIGKILL, SIGBUS, SIGSEGV, SIGSYS, SIGPIPE, SIGALRM, SIGTERM, #ifdef SIGXCPU SIGXCPU, #endif #ifdef SIGXFSZ SIGXFSZ, #endif #ifdef SIGVTALRM SIGVTALRM, #endif #ifdef SIGPROF SIGPROF, #endif #ifdef SIGLOST SIGLOST, #endif #ifdef SIGUSR1 SIGUSR1, SIGUSR2 #endif }; #define TERMSIGS_LENGTH (sizeof (terminating_signals) / sizeof (int)) static void catch_termination (sig) int sig; { /* We are probably here because GDB has a bug. Write out the history so that we might have a better chance of reproducing it. */ /* Tell the user what we are doing so he can delete the file if it is unwanted. */ write_history (history_filename); printf ("\n%s written.\n", history_filename); signal (sig, SIG_DFL); kill (getpid (), sig); } #endif /* Initialize signal handlers. */ static void do_nothing () { } static void init_signals () { extern void request_quit (); #if 0 register int i; for (i = 0; i < TERMSIGS_LENGTH; i++) signal (terminating_signals[i], catch_termination); #endif signal (SIGINT, request_quit); /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get passed to the inferior, which we don't want. It would be possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but on BSD4.3 systems using vfork, that will (apparently) affect the GDB process as well as the inferior (the signal handling tables being shared between the two, apparently). Since we establish a handler for SIGQUIT, when we call exec it will set the signal to SIG_DFL for us. */ signal (SIGQUIT, do_nothing); if (signal (SIGHUP, do_nothing) != SIG_IGN) signal (SIGHUP, disconnect); signal (SIGFPE, float_handler); } /* Read one line from the command input stream `instream' into the local static buffer `linebuffer' (whose current length is `linelength'). The buffer is made bigger as necessary. Returns the address of the start of the line. NULL is returned for end of file. *If* the instream == stdin & stdin is a terminal, the line read is copied into the file line saver (global var char *line, length linesize) so that it can be duplicated. This routine either uses fancy command line editing or simple input as the user has requested. */ char * command_line_input (prrompt, repeat) char *prrompt; int repeat; { static char *linebuffer = 0; static int linelength = 0; register char *p; char *p1; char *rl; char *local_prompt = prrompt; register int c; char *nline; char got_eof = 0; if (linebuffer == 0) { linelength = 80; linebuffer = (char *) xmalloc (linelength); } p = linebuffer; /* Control-C quits instantly if typed while in this loop since it should not wait until the user types a newline. */ immediate_quit++; #ifdef STOP_SIGNAL signal (STOP_SIGNAL, stop_sig); #endif while (1) { /* Reports are that some Sys V's don't flush stdout/err on reads from stdin, when stdin/out are sockets rather than ttys. So we have to do it ourselves, to make emacs-gdb and xxgdb work. On other machines, doing this once per input should be a cheap nop. */ fflush (stdout); fflush (stderr); /* Don't use fancy stuff if not talking to stdin. */ if (command_editing_p && instream == stdin && ISATTY (instream)) rl = readline (local_prompt); else rl = gdb_readline (local_prompt, 1); if (!rl || rl == (char *) EOF) { got_eof = 1; break; } if (strlen(rl) + 1 + (p - linebuffer) > linelength) { linelength = strlen(rl) + 1 + (p - linebuffer); nline = (char *) xrealloc (linebuffer, linelength); p += nline - linebuffer; linebuffer = nline; } p1 = rl; /* Copy line. Don't copy null at end. (Leaves line alone if this was just a newline) */ while (*p1) *p++ = *p1++; free (rl); /* Allocated in readline. */ if (p == linebuffer || *(p - 1) != '\\') break; p--; /* Put on top of '\'. */ local_prompt = (char *) 0; } #ifdef STOP_SIGNAL signal (SIGTSTP, SIG_DFL); #endif immediate_quit--; if (got_eof) return NULL; /* Do history expansion if that is wished. */ if (history_expansion_p && instream == stdin && ISATTY (instream)) { char *history_value; int expanded; *p = '\0'; /* Insert null now. */ expanded = history_expand (linebuffer, &history_value); if (expanded) { /* Print the changes. */ printf ("%s\n", history_value); /* If there was an error, call this function again. */ if (expanded < 0) { free (history_value); return command_line_input (prrompt, repeat); } if (strlen (history_value) > linelength) { linelength = strlen (history_value) + 1; linebuffer = (char *) xrealloc (linebuffer, linelength); } strcpy (linebuffer, history_value); p = linebuffer + strlen(linebuffer); free (history_value); } } /* If we just got an empty line, and that is supposed to repeat the previous command, return the value in the global buffer. */ if (repeat) { if (p == linebuffer) return line; p1 = linebuffer; while (*p1 == ' ' || *p1 == '\t') p1++; if (!*p1) return line; } *p = 0; /* Add line to history if appropriate. */ if (instream == stdin && ISATTY (stdin) && *linebuffer) add_history (linebuffer); /* Note: lines consisting soley of comments are added to the command history. This is useful when you type a command, and then realize you don't want to execute it quite yet. You can comment out the command and then later fetch it from the value history and remove the '#'. The kill ring is probably better, but some people are in the habit of commenting things out. */ p1 = linebuffer; while ((c = *p1++) != '\0') { if (c == '"') while ((c = *p1++) != '"') { /* Make sure an escaped '"' doesn't make us think the string is ended. */ if (c == '\\') parse_escape (&p1); if (c == '\0') break; } else if (c == '\'') while ((c = *p1++) != '\'') { /* Make sure an escaped '\'' doesn't make us think the string is ended. */ if (c == '\\') parse_escape (&p1); if (c == '\0') break; } else if (c == '#') { /* Found a comment. */ p1[-1] = '\0'; break; } } /* Save into global buffer if appropriate. */ if (repeat) { if (linelength > linesize) { line = xrealloc (line, linelength); linesize = linelength; } strcpy (line, linebuffer); return line; } return linebuffer; } /* Read lines from the input stream and accumulate them in a chain of struct command_line's which is then returned. */ struct command_line * read_command_lines () { struct command_line *first = 0; register struct command_line *next, *tail = 0; register char *p, *p1; struct cleanup *old_chain = 0; while (1) { dont_repeat (); p = command_line_input (0, instream == stdin); if (p == NULL) /* Treat end of file like "end". */ break; /* Remove leading and trailing blanks. */ while (*p == ' ' || *p == '\t') p++; p1 = p + strlen (p); while (p1 != p && (p1[-1] == ' ' || p1[-1] == '\t')) p1--; /* Is this "end"? */ if (p1 - p == 3 && !strncmp (p, "end", 3)) break; /* No => add this line to the chain of command lines. */ next = (struct command_line *) xmalloc (sizeof (struct command_line)); next->line = savestring (p, p1 - p); next->next = 0; if (tail) { tail->next = next; } else { /* We just read the first line. From now on, arrange to throw away the lines we have if we quit or get an error while inside this function. */ first = next; old_chain = make_cleanup (free_command_lines, &first); } tail = next; } dont_repeat (); /* Now we are about to return the chain to our caller, so freeing it becomes his responsibility. */ if (first) discard_cleanups (old_chain); return first; } /* Free a chain of struct command_line's. */ void free_command_lines (lptr) struct command_line **lptr; { register struct command_line *l = *lptr; register struct command_line *next; while (l) { next = l->next; free (l->line); free (l); l = next; } } /* Add an element to the list of info subcommands. */ void add_info (name, fun, doc) char *name; void (*fun) (); char *doc; { add_cmd (name, no_class, fun, doc, &infolist); } /* Add an alias to the list of info subcommands. */ void add_info_alias (name, oldname, abbrev_flag) char *name; char *oldname; int abbrev_flag; { add_alias_cmd (name, oldname, 0, abbrev_flag, &infolist); } /* The "info" command is defined as a prefix, with allow_unknown = 0. Therefore, its own definition is called only for "info" with no args. */ /* ARGSUSED */ static void info_command (arg, from_tty) char *arg; int from_tty; { printf ("\"info\" must be followed by the name of an info command.\n"); help_list (infolist, "info ", -1, stdout); } /* The "show" command with no arguments shows all the settings. */ /* ARGSUSED */ static void show_command (arg, from_tty) char *arg; int from_tty; { cmd_show_list (showlist, from_tty, ""); } /* Add an element to the list of commands. */ void add_com (name, class, fun, doc) char *name; enum command_class class; void (*fun) (); char *doc; { add_cmd (name, class, fun, doc, &cmdlist); } /* Add an alias or abbreviation command to the list of commands. */ void add_com_alias (name, oldname, class, abbrev_flag) char *name; char *oldname; enum command_class class; int abbrev_flag; { add_alias_cmd (name, oldname, class, abbrev_flag, &cmdlist); } void error_no_arg (why) char *why; { error ("Argument required (%s).", why); } /* ARGSUSED */ static void help_command (command, from_tty) char *command; int from_tty; /* Ignored */ { help_cmd (command, stdout); } static void validate_comname (comname) char *comname; { register char *p; if (comname == 0) error_no_arg ("name of command to define"); p = comname; while (*p) { if (!(*p >= 'A' && *p <= 'Z') && !(*p >= 'a' && *p <= 'z') && !(*p >= '0' && *p <= '9') && *p != '-') error ("Junk in argument list: \"%s\"", p); p++; } } static void define_command (comname, from_tty) char *comname; int from_tty; { register struct command_line *cmds; register struct cmd_list_element *c, *newc; char *tem = comname; extern void not_just_help_class_command (); validate_comname (comname); c = lookup_cmd (&tem, cmdlist, "", -1, 1); if (c) { if (c->class == class_user || c->class == class_alias) tem = "Redefine command \"%s\"? "; else tem = "Really redefine built-in command \"%s\"? "; if (!query (tem, comname)) error ("Command \"%s\" not redefined.", comname); } if (from_tty) { printf ("Type commands for definition of \"%s\".\n\ End with a line saying just \"end\".\n", comname); fflush (stdout); } comname = savestring (comname, strlen (comname)); cmds = read_command_lines (); if (c && c->class == class_user) free_command_lines (&c->user_commands); newc = add_cmd (comname, class_user, not_just_help_class_command, (c && c->class == class_user) ? c->doc : savestring ("User-defined.", 13), &cmdlist); newc->user_commands = cmds; } static void document_command (comname, from_tty) char *comname; int from_tty; { struct command_line *doclines; register struct cmd_list_element *c; char *tem = comname; validate_comname (comname); c = lookup_cmd (&tem, cmdlist, "", 0, 1); if (c->class != class_user) error ("Command \"%s\" is built-in.", comname); if (from_tty) printf ("Type documentation for \"%s\".\n\ End with a line saying just \"end\".\n", comname); doclines = read_command_lines (); if (c->doc) free (c->doc); { register struct command_line *cl1; register int len = 0; for (cl1 = doclines; cl1; cl1 = cl1->next) len += strlen (cl1->line) + 1; c->doc = (char *) xmalloc (len + 1); *c->doc = 0; for (cl1 = doclines; cl1; cl1 = cl1->next) { strcat (c->doc, cl1->line); if (cl1->next) strcat (c->doc, "\n"); } } free_command_lines (&doclines); } static void print_gdb_version (shout) int shout; { printf ("GDB %s, Copyright (C) 1991 Free Software Foundation, Inc.\n", version); if (shout) printf ("\ There is ABSOLUTELY NO WARRANTY for GDB; type \"info warranty\" for details.\n\ GDB is free software and you are welcome to distribute copies of it\n\ under certain conditions; type \"info copying\" to see the conditions.\n"); } /* ARGSUSED */ static void show_version (args, from_tty) char *args; int from_tty; { immediate_quit++; print_gdb_version (0); immediate_quit--; } /* xgdb calls this to reprint the usual GDB prompt. */ void print_prompt () { printf ("%s", prompt); fflush (stdout); } static void quit_command (args, from_tty) char *args; int from_tty; { if (inferior_pid != 0 && target_has_execution) { if (query ("The program is running. Quit anyway? ")) { target_kill (args, from_tty); } else error ("Not confirmed."); } /* Save the history information if it is appropriate to do so. */ if (write_history_p && history_filename) write_history (history_filename); exit (0); } int input_from_terminal_p () { return (instream == stdin) & caution; } /* ARGSUSED */ static void pwd_command (args, from_tty) char *args; int from_tty; { if (args) error ("The \"pwd\" command does not take an argument: %s", args); getwd (dirbuf); if (strcmp (dirbuf, current_directory)) printf ("Working directory %s\n (canonically %s).\n", current_directory, dirbuf); else printf ("Working directory %s.\n", current_directory); } static void cd_command (dir, from_tty) char *dir; int from_tty; { int len; int change; /* If the new directory is absolute, repeat is a no-op; if relative, repeat might be useful but is more likely to be a mistake. */ dont_repeat (); if (dir == 0) error_no_arg ("new working directory"); dir = tilde_expand (dir); make_cleanup (free, dir); len = strlen (dir); dir = savestring (dir, len - (len > 1 && dir[len-1] == '/')); if (dir[0] == '/') current_directory = dir; else { current_directory = concat (current_directory, "/", dir); free (dir); } /* Now simplify any occurrences of `.' and `..' in the pathname. */ change = 1; while (change) { char *p; change = 0; for (p = current_directory; *p;) { if (!strncmp (p, "/./", 2) && (p[2] == 0 || p[2] == '/')) strcpy (p, p + 2); else if (!strncmp (p, "/..", 3) && (p[3] == 0 || p[3] == '/') && p != current_directory) { char *q = p; while (q != current_directory && q[-1] != '/') q--; if (q != current_directory) { strcpy (q-1, p+3); p = q-1; } } else p++; } } if (chdir (dir) < 0) perror_with_name (dir); forget_cached_source_info (); if (from_tty) pwd_command ((char *) 0, 1); } /* ARGSUSED */ static void source_command (args, from_tty) char *args; int from_tty; { FILE *stream; struct cleanup *cleanups; char *file = args; if (file == 0) /* Let source without arguments read .gdbinit. */ file = gdbinit; file = tilde_expand (file); make_cleanup (free, file); stream = fopen (file, "r"); if (stream == 0) perror_with_name (file); cleanups = make_cleanup (fclose, stream); read_command_file (stream); do_cleanups (cleanups); } /* ARGSUSED */ static void echo_command (text, from_tty) char *text; int from_tty; { char *p = text; register int c; if (text) while (c = *p++) { if (c == '\\') { /* \ at end of argument is used after spaces so they won't be lost. */ if (*p == 0) return; c = parse_escape (&p); if (c >= 0) fputc (c, stdout); } else fputc (c, stdout); } fflush (stdout); } /* ARGSUSED */ static void dump_me_command (args, from_tty) char *args; int from_tty; { if (query ("Should GDB dump core? ")) { signal (SIGQUIT, SIG_DFL); kill (getpid (), SIGQUIT); } } /* Functions to manipulate command line editing control variables. */ /* Number of commands to print in each call to show_commands. */ #define Hist_print 10 static void show_commands (args, from_tty) char *args; int from_tty; { /* Index for history commands. Relative to history_base. */ int offset; /* Number of the history entry which we are planning to display next. Relative to history_base. */ static int num = 0; /* The first command in the history which doesn't exist (i.e. one more than the number of the last command). Relative to history_base. */ int hist_len; struct _hist_entry *history_get(); extern int history_base; #if 0 /* This is all reported by individual "show" commands. */ printf_filtered ("Interactive command editing is %s.\n", command_editing_p ? "on" : "off"); printf_filtered ("History expansion of command input is %s.\n", history_expansion_p ? "on" : "off"); printf_filtered ("Writing of a history record upon exit is %s.\n", write_history_p ? "enabled" : "disabled"); printf_filtered ("The size of the history list (number of stored commands) is %d.\n", history_size); printf_filtered ("The name of the history record is \"%s\".\n\n", history_filename ? history_filename : ""); #endif /* 0 */ /* Print out some of the commands from the command history. */ /* First determine the length of the history list. */ hist_len = history_size; for (offset = 0; offset < history_size; offset++) { if (!history_get (history_base + offset)) { hist_len = offset; break; } } if (args) { if (args[0] == '+' && args[1] == '\0') /* "info editing +" should print from the stored position. */ ; else /* "info editing " should print around command number . */ num = (parse_and_eval_address (args) - history_base) - Hist_print / 2; } /* "info editing" means print the last Hist_print commands. */ else { num = hist_len - Hist_print; } if (num < 0) num = 0; /* If there are at least Hist_print commands, we want to display the last Hist_print rather than, say, the last 6. */ if (hist_len - num < Hist_print) { num = hist_len - Hist_print; if (num < 0) num = 0; } #if 0 /* No need for a header now that "info editing" only prints one thing. */ if (num == hist_len - Hist_print) printf_filtered ("The list of the last %d commands is:\n\n", Hist_print); else printf_filtered ("Some of the stored commands are:\n\n"); #endif /* 0 */ for (offset = num; offset < num + Hist_print && offset < hist_len; offset++) { printf_filtered ("%5d %s\n", history_base + offset, (history_get (history_base + offset))->line); } /* The next command we want to display is the next one that we haven't displayed yet. */ num += Hist_print; /* If the user repeats this command with return, it should do what "info editing +" does. This is unnecessary if arg is null, because "info editing +" is not useful after "info editing". */ if (from_tty && args) { args[0] = '+'; args[1] = '\0'; } } /* Called by do_setshow_command. */ /* ARGSUSED */ static void set_history_size_command (args, from_tty, c) char *args; int from_tty; struct cmd_list_element *c; { if (history_size == UINT_MAX) unstifle_history (); else stifle_history (history_size); } /* ARGSUSED */ static void set_history (args, from_tty) char *args; int from_tty; { printf ("\"set history\" must be followed by the name of a history subcommand.\n"); help_list (sethistlist, "set history ", -1, stdout); } /* ARGSUSED */ static void show_history (args, from_tty) char *args; int from_tty; { cmd_show_list (showhistlist, from_tty, ""); } int info_verbose = 0; /* Default verbose msgs off */ /* Called by do_setshow_command. An elaborate joke. */ /* ARGSUSED */ static void set_verbose (args, from_tty, c) char *args; int from_tty; struct cmd_list_element *c; { char *cmdname = "verbose"; struct cmd_list_element *showcmd; showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1); if (info_verbose) { c->doc = "Set verbose printing of informational messages."; showcmd->doc = "Show verbose printing of informational messages."; } else { c->doc = "Set verbosity."; showcmd->doc = "Show verbosity."; } } static void float_handler () { /* This message is based on ANSI C, section 4.7. Note that integer divide by zero causes this, so "float" is a misnomer. */ error ("Erroneous arithmetic operation."); } /* Return whether we are running a batch file or from terminal. */ int batch_mode () { return !(instream == stdin && ISATTY (stdin)); } static void initialize_cmd_lists () { cmdlist = (struct cmd_list_element *) 0; infolist = (struct cmd_list_element *) 0; enablelist = (struct cmd_list_element *) 0; disablelist = (struct cmd_list_element *) 0; deletelist = (struct cmd_list_element *) 0; enablebreaklist = (struct cmd_list_element *) 0; setlist = (struct cmd_list_element *) 0; showlist = NULL; sethistlist = (struct cmd_list_element *) 0; showhistlist = NULL; unsethistlist = (struct cmd_list_element *) 0; } static void initialize_main () { struct cmd_list_element *c; char *tmpenv; #ifdef DEFAULT_PROMPT prompt = savestring (DEFAULT_PROMPT, strlen(DEFAULT_PROMPT)); #else prompt = savestring ("(gdb) ", 6); #endif /* Set the important stuff up for command editing. */ command_editing_p = 1; history_expansion_p = 0; write_history_p = 0; if (tmpenv = getenv ("HISTSIZE")) history_size = atoi (tmpenv); else history_size = 256; stifle_history (history_size); if (tmpenv = getenv ("GDBHISTFILE")) history_filename = savestring (tmpenv, strlen(tmpenv)); else /* We include the current directory so that if the user changes directories the file written will be the same as the one that was read. */ history_filename = concat (current_directory, "/.gdb_history", ""); read_history (history_filename); /* Setup important stuff for command line editing. */ rl_completion_entry_function = (int (*)()) symbol_completion_function; rl_completer_word_break_characters = gdb_completer_word_break_characters; rl_readline_name = "gdb"; /* Define the classes of commands. They will appear in the help list in the reverse of this order. */ add_cmd ("obscure", class_obscure, NO_FUNCTION, "Obscure features.", &cmdlist); add_cmd ("aliases", class_alias, NO_FUNCTION, "Aliases of other commands.", &cmdlist); add_cmd ("user-defined", class_user, NO_FUNCTION, "User-defined commands.\n\ The commands in this class are those defined by the user.\n\ Use the \"define\" command to define a command.", &cmdlist); add_cmd ("support", class_support, NO_FUNCTION, "Support facilities.", &cmdlist); add_cmd ("status", class_info, NO_FUNCTION, "Status inquiries.", &cmdlist); add_cmd ("files", class_files, NO_FUNCTION, "Specifying and examining files.", &cmdlist); add_cmd ("breakpoints", class_breakpoint, NO_FUNCTION, "Making program stop at certain points.", &cmdlist); add_cmd ("data", class_vars, NO_FUNCTION, "Examining data.", &cmdlist); add_cmd ("stack", class_stack, NO_FUNCTION, "Examining the stack.\n\ The stack is made up of stack frames. Gdb assigns numbers to stack frames\n\ counting from zero for the innermost (currently executing) frame.\n\n\ At any time gdb identifies one frame as the \"selected\" frame.\n\ Variable lookups are done with respect to the selected frame.\n\ When the program being debugged stops, gdb selects the innermost frame.\n\ The commands below can be used to select other frames by number or address.", &cmdlist); add_cmd ("running", class_run, NO_FUNCTION, "Running the program.", &cmdlist); add_com ("pwd", class_files, pwd_command, "Print working directory. This is used for your program as well."); add_com ("cd", class_files, cd_command, "Set working directory to DIR for debugger and program being debugged.\n\ The change does not take effect for the program being debugged\n\ until the next time it is started."); add_show_from_set (add_set_cmd ("prompt", class_support, var_string, (char *)&prompt, "Set gdb's prompt", &setlist), &showlist); add_com ("echo", class_support, echo_command, "Print a constant string. Give string as argument.\n\ C escape sequences may be used in the argument.\n\ No newline is added at the end of the argument;\n\ use \"\\n\" if you want a newline to be printed.\n\ Since leading and trailing whitespace are ignored in command arguments,\n\ if you want to print some you must use \"\\\" before leading whitespace\n\ to be printed or after trailing whitespace."); add_com ("document", class_support, document_command, "Document a user-defined command.\n\ Give command name as argument. Give documentation on following lines.\n\ End with a line of just \"end\"."); add_com ("define", class_support, define_command, "Define a new command name. Command name is argument.\n\ Definition appears on following lines, one command per line.\n\ End with a line of just \"end\".\n\ Use the \"document\" command to give documentation for the new command.\n\ Commands defined in this way do not take arguments."); #ifdef __STDC__ add_com ("source", class_support, source_command, "Read commands from a file named FILE.\n\ Note that the file \"" GDBINIT_FILENAME "\" is read automatically in this way\n\ when gdb is started."); #else /* Punt file name, we can't help it easily. */ add_com ("source", class_support, source_command, "Read commands from a file named FILE.\n\ Note that the file \".gdbinit\" is read automatically in this way\n\ when gdb is started."); #endif add_com ("quit", class_support, quit_command, "Exit gdb."); add_com ("help", class_support, help_command, "Print list of commands."); add_com_alias ("q", "quit", class_support, 1); add_com_alias ("h", "help", class_support, 1); c = add_set_cmd ("verbose", class_support, var_boolean, (char *)&info_verbose, "Set ", &setlist), add_show_from_set (c, &showlist); c->function = set_verbose; set_verbose (NULL, 0, c); add_com ("dump-me", class_obscure, dump_me_command, "Get fatal error; make debugger dump its core."); add_show_from_set (add_set_cmd ("editing", class_support, var_boolean, (char *)&command_editing_p, "Set command line editing.\n\ Use \"on\" to enable to enable the editing, and \"off\" to disable it.\n\ Without an argument, command line editing is enabled.", &setlist), &showlist); add_prefix_cmd ("history", class_support, set_history, "Generic command for setting command history parameters.", &sethistlist, "set history ", 0, &setlist); add_prefix_cmd ("history", class_support, show_history, "Generic command for showing command history parameters.", &showhistlist, "show history ", 0, &showlist); add_show_from_set (add_set_cmd ("expansion", no_class, var_boolean, (char *)&history_expansion_p, "Set history expansion on command input.\n\ Without an argument, history expansion is enabled.", &sethistlist), &showhistlist); add_show_from_set (add_set_cmd ("save", no_class, var_boolean, (char *)&write_history_p, "Set saving of the history record on exit.\n\ Use \"on\" to enable to enable the saving, and \"off\" to disable it.\n\ Without an argument, saving is enabled.", &sethistlist), &showhistlist); c = add_set_cmd ("size", no_class, var_uinteger, (char *)&history_size, "Set the size of the command history, \n\ ie. the number of previous commands to keep a record of.", &sethistlist); add_show_from_set (c, &showhistlist); c->function = set_history_size_command; add_show_from_set (add_set_cmd ("filename", no_class, var_filename, (char *)&history_filename, "Set the filename in which to record the command history\n\ (the list of previous commands of which a record is kept).", &sethistlist), &showhistlist); add_show_from_set (add_set_cmd ("confirm", class_support, var_boolean, (char *)&caution, "Set whether to confirm potentially dangerous operations.", &setlist), &showlist); add_prefix_cmd ("info", class_info, info_command, "Generic command for printing status.", &infolist, "info ", 0, &cmdlist); add_com_alias ("i", "info", class_info, 1); add_prefix_cmd ("show", class_info, show_command, "Generic command for showing things set with \"set\".", &showlist, "show ", 0, &cmdlist); /* Another way to get at the same thing. */ add_info ("set", show_command, "Show all GDB settings."); add_cmd ("commands", no_class, show_commands, "Status of command editor.", &showlist); add_cmd ("version", no_class, show_version, "Report what version of GDB this is.", &showlist); }