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binutils-gdb/gdb/main.c
Michael Snyder 00546b04b2 2002-01-10 Michael Snyder <msnyder@redhat.com> 
* main.c (captured_main): Add new command line option "--pid".
	If the second command line argument (following the symbol-file)
	begins with a digit, try to attach to it before trying to open
	it as a corefile.
	(print_gdb_help): Document the "--pid" argument.
2002-01-10 23:03:08 +00:00

818 lines
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/* 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
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"
/* 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;
#ifdef UI_OUT
/* Has an interpreter been specified and if so, which. */
char *interpreter_p;
#endif
/* Whether this is the command line version or not */
int tui_version = 0;
/* Whether xdb commands will be handled */
int xdb_commands = 0;
/* Whether dbx commands will be handled */
int dbx_commands = 0;
struct ui_file *gdb_stdout;
struct ui_file *gdb_stderr;
struct ui_file *gdb_stdlog;
struct ui_file *gdb_stdtarg;
/* Used to initialize error() - defined in utils.c */
extern void error_init (void);
/* 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)
{
if (command_loop_hook == NULL)
command_loop ();
else
command_loop_hook ();
/* 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;
}
struct captured_main_args
{
int argc;
char **argv;
};
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;
register int i;
long time_at_startup = get_run_time ();
START_PROGRESS (argv[0], 0);
#ifdef MPW
/* Do all Mac-specific setup. */
mac_init ();
#endif /* MPW */
/* This needs to happen before the first use of malloc. */
init_malloc ((PTR) NULL);
#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 */
/* initialize error() */
error_init ();
/* 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). */
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, &tui_version, 1},
#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, 12},
{"help", no_argument, &print_help, 1},
{"se", required_argument, 0, 10},
{"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
#ifdef UI_OUT
{"ui", required_argument, 0, 'i'},
{"interpreter", required_argument, 0, 'i'},
{"i", required_argument, 0, 'i'},
#endif
{"directory", required_argument, 0, 'd'},
{"d", required_argument, 0, 'd'},
{"cd", required_argument, 0, 11},
{"tty", required_argument, 0, 't'},
{"baud", required_argument, 0, 'b'},
{"b", required_argument, 0, 'b'},
{"nw", no_argument, &use_windows, 0},
{"nowindows", no_argument, &use_windows, 0},
{"w", no_argument, &use_windows, 1},
{"windows", no_argument, &use_windows, 1},
{"statistics", no_argument, 0, 13},
{"write", no_argument, &write_files, 1},
{"args", no_argument, &set_args, 1},
/* Allow machine descriptions to add more options... */
#ifdef ADDITIONAL_OPTIONS
ADDITIONAL_OPTIONS
#endif
{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 10:
symarg = optarg;
execarg = optarg;
break;
case 11:
cdarg = optarg;
break;
case 12:
/* FIXME: what if the syntax is wrong (e.g. not digits)? */
annotation_level = atoi (optarg);
break;
case 13:
/* Enable the display of both time and space usage. */
display_time = 1;
display_space = 1;
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 */
#ifdef UI_OUT
case 'i':
interpreter_p = optarg;
break;
#endif
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;
}
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;
#ifdef ADDITIONAL_OPTION_CASES
ADDITIONAL_OPTION_CASES
#endif
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;
#ifdef TUI
/* Disable the TUI as well. */
tui_version = 0;
#endif
}
#ifdef TUI
/* An explicit --tui flag overrides the default UI, which is the
window system. */
if (tui_version)
use_windows = 0;
#endif
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. */
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);
}
if (!quiet)
{
/* 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
&& STREQ (execarg, symarg))
{
/* 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);
#ifdef ADDITIONAL_OPTION_HANDLER
ADDITIONAL_OPTION_HANDLER;
#endif
/* 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
main (int argc, char **argv)
{
struct captured_main_args args;
args.argc = argc;
args.argv = argv;
catch_errors (captured_main, &args, "", RETURN_MASK_ALL);
return 0;
}
/* 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);
#ifdef ADDITIONAL_OPTION_HELP
fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
#endif
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);
}
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