shell.c

android-w.song.android.widget

      e = errno;
      /* If it's not in the current directory, try looking through PATH
	 for it. */
      path_filename = find_path_file (script_name);
      if (path_filename)
	{
	  free (filename);
	  filename = path_filename;
	  fd = open (filename, O_RDONLY);
	}
      else
	errno = e;
    }

  if (fd < 0)
    {
      e = errno;
      file_error (filename);
      exit ((e == ENOENT) ? EX_NOTFOUND : EX_NOINPUT);
    }

  free (dollar_vars[0]);
  dollar_vars[0] = exec_argv0 ? savestring (exec_argv0) : savestring (script_name);
  if (exec_argv0)
    {
      free (exec_argv0);
      exec_argv0 = (char *)NULL;
    }

#if defined (ARRAY_VARS)
  GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
  GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
  GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);

  array_push (bash_source_a, filename);
  if (bash_lineno_a)
    {
      t = itos (executing_line_number ());
      array_push (bash_lineno_a, t);
      free (t);
    }
  array_push (funcname_a, "main");
#endif

#ifdef HAVE_DEV_FD
  fd_is_tty = isatty (fd);
#else
  fd_is_tty = 0;
#endif

  /* Only do this with non-tty file descriptors we can seek on. */
  if (fd_is_tty == 0 && (lseek (fd, 0L, 1) != -1))
    {
      /* Check to see if the `file' in `bash file' is a binary file
	 according to the same tests done by execute_simple_command (),
	 and report an error and exit if it is. */
      sample_len = read (fd, sample, sizeof (sample));
      if (sample_len < 0)
	{
	  e = errno;
	  if ((fstat (fd, &sb) == 0) && S_ISDIR (sb.st_mode))
	    internal_error (_("%s: is a directory"), filename);
	  else
	    {
	      errno = e;
	      file_error (filename);
	    }
	  exit (EX_NOEXEC);
	}
      else if (sample_len > 0 && (check_binary_file (sample, sample_len)))
	{
	  internal_error (_("%s: cannot execute binary file"), filename);
	  exit (EX_BINARY_FILE);
	}
      /* Now rewind the file back to the beginning. */
      lseek (fd, 0L, 0);
    }

  /* Open the script.  But try to move the file descriptor to a randomly
     large one, in the hopes that any descriptors used by the script will
     not match with ours. */
  fd = move_to_high_fd (fd, 1, -1);

#if defined (BUFFERED_INPUT)
  default_buffered_input = fd;
  SET_CLOSE_ON_EXEC (default_buffered_input);
#else /* !BUFFERED_INPUT */
  default_input = fdopen (fd, "r");

  if (default_input == 0)
    {
      file_error (filename);
      exit (EX_NOTFOUND);
    }

  SET_CLOSE_ON_EXEC (fd);
  if (fileno (default_input) != fd)
    SET_CLOSE_ON_EXEC (fileno (default_input));
#endif /* !BUFFERED_INPUT */

  /* Just about the only way for this code to be executed is if something
     like `bash -i /dev/stdin' is executed. */
  if (interactive_shell && fd_is_tty)
    {
      dup2 (fd, 0);
      close (fd);
      fd = 0;
#if defined (BUFFERED_INPUT)
      default_buffered_input = 0;
#else
      fclose (default_input);
      default_input = stdin;
#endif
    }
  else if (forced_interactive && fd_is_tty == 0)
    /* But if a script is called with something like `bash -i scriptname',
       we need to do a non-interactive setup here, since we didn't do it
       before. */
    init_interactive_script ();

  free (filename);
  return (fd);
}

/* Initialize the input routines for the parser. */
static void
set_bash_input ()
{
  /* Make sure the fd from which we are reading input is not in
     no-delay mode. */
#if defined (BUFFERED_INPUT)
  if (interactive == 0)
    sh_unset_nodelay_mode (default_buffered_input);
  else
#endif /* !BUFFERED_INPUT */
    sh_unset_nodelay_mode (fileno (stdin));

  /* with_input_from_stdin really means `with_input_from_readline' */
  if (interactive && no_line_editing == 0)
    with_input_from_stdin ();
#if defined (BUFFERED_INPUT)
  else if (interactive == 0)
    with_input_from_buffered_stream (default_buffered_input, dollar_vars[0]);
#endif /* BUFFERED_INPUT */
  else
    with_input_from_stream (default_input, dollar_vars[0]);
}

/* Close the current shell script input source and forget about it.  This is
   extern so execute_cmd.c:initialize_subshell() can call it.  If CHECK_ZERO
   is non-zero, we close default_buffered_input even if it's the standard
   input (fd 0). */
void
unset_bash_input (check_zero)
     int check_zero;
{
#if defined (BUFFERED_INPUT)
  if ((check_zero && default_buffered_input >= 0) ||
      (check_zero == 0 && default_buffered_input > 0))
    {
      close_buffered_fd (default_buffered_input);
      default_buffered_input = bash_input.location.buffered_fd = -1;
      bash_input.type = st_none;		/* XXX */
    }
#else /* !BUFFERED_INPUT */
  if (default_input)
    {
      fclose (default_input);
      default_input = (FILE *)NULL;
    }
#endif /* !BUFFERED_INPUT */
}
      

#if !defined (PROGRAM)
#  define PROGRAM "bash"
#endif

static void
set_shell_name (argv0)
     char *argv0;
{
  /* Here's a hack.  If the name of this shell is "sh", then don't do
     any startup files; just try to be more like /bin/sh. */
  shell_name = argv0 ? base_pathname (argv0) : PROGRAM;

  if (argv0 && *argv0 == '-')
    {
      if (*shell_name == '-')
	shell_name++;
      login_shell++;
    }

  if (shell_name[0] == 's' && shell_name[1] == 'h' && shell_name[2] == '\0')
    act_like_sh++;
  if (shell_name[0] == 's' && shell_name[1] == 'u' && shell_name[2] == '\0')
    su_shell++;

  shell_name = argv0 ? argv0 : PROGRAM;
  FREE (dollar_vars[0]);
  dollar_vars[0] = savestring (shell_name);

  /* A program may start an interactive shell with
	  "execl ("/bin/bash", "-", NULL)".
     If so, default the name of this shell to our name. */
  if (!shell_name || !*shell_name || (shell_name[0] == '-' && !shell_name[1]))
    shell_name = PROGRAM;
}

static void
init_interactive ()
{
  expand_aliases = interactive_shell = startup_state = 1;
  interactive = 1;
}

static void
init_noninteractive ()
{
#if defined (HISTORY)
  bash_history_reinit (0);
#endif /* HISTORY */
  interactive_shell = startup_state = interactive = 0;
  expand_aliases = posixly_correct;	/* XXX - was 0 not posixly_correct */
  no_line_editing = 1;
#if defined (JOB_CONTROL)
  set_job_control (0);
#endif /* JOB_CONTROL */
}

static void
init_interactive_script ()
{
  init_noninteractive ();
  expand_aliases = interactive_shell = startup_state = 1;
}

void
get_current_user_info ()
{
  struct passwd *entry;

  /* Don't fetch this more than once. */
  if (current_user.user_name == 0)
    {
      entry = getpwuid (current_user.uid);
      if (entry)
	{
	  current_user.user_name = savestring (entry->pw_name);
	  current_user.shell = (entry->pw_shell && entry->pw_shell[0])
				? savestring (entry->pw_shell)
				: savestring ("/bin/sh");
	  current_user.home_dir = savestring (entry->pw_dir);
	}
      else
	{
	  current_user.user_name = _("I have no name!");
	  current_user.user_name = savestring (current_user.user_name);
	  current_user.shell = savestring ("/bin/sh");
	  current_user.home_dir = savestring ("/");
	}
      endpwent ();
    }
}

/* Do whatever is necessary to initialize the shell.
   Put new initializations in here. */
static void
shell_initialize ()
{
  char hostname[256];

  /* Line buffer output for stderr and stdout. */
  if (shell_initialized == 0)
    {
      sh_setlinebuf (stderr);
      sh_setlinebuf (stdout);
    }

  /* Sort the array of shell builtins so that the binary search in
     find_shell_builtin () works correctly. */
  initialize_shell_builtins ();

  /* Initialize the trap signal handlers before installing our own
     signal handlers.  traps.c:restore_original_signals () is responsible
     for restoring the original default signal handlers.  That function
     is called when we make a new child. */
  initialize_traps ();
  initialize_signals (0);

  /* It's highly unlikely that this will change. */
  if (current_host_name == 0)
    {
      /* Initialize current_host_name. */
      if (gethostname (hostname, 255) < 0)
	current_host_name = "??host??";
      else
	current_host_name = savestring (hostname);
    }

  /* Initialize the stuff in current_user that comes from the password
     file.  We don't need to do this right away if the shell is not
     interactive. */
  if (interactive_shell)
    get_current_user_info ();

  /* Initialize our interface to the tilde expander. */
  tilde_initialize ();

  /* Initialize internal and environment variables.  Don't import shell
     functions from the environment if we are running in privileged or
     restricted mode or if the shell is running setuid. */
#if defined (RESTRICTED_SHELL)
  initialize_shell_variables (shell_environment, privileged_mode||restricted||running_setuid);
#else
  initialize_shell_variables (shell_environment, privileged_mode||running_setuid);
#endif

  /* Initialize the data structures for storing and running jobs. */
  initialize_job_control (0);

  /* Initialize input streams to null. */
  initialize_bash_input ();

  initialize_flags ();

  /* Initialize the shell options.  Don't import the shell options
     from the environment variables $SHELLOPTS or $BASHOPTS if we are
     running in privileged or restricted mode or if the shell is running
     setuid. */
#if defined (RESTRICTED_SHELL)
  initialize_shell_options (privileged_mode||restricted||running_setuid);
  initialize_bashopts (privileged_mode||restricted||running_setuid);
#else
  initialize_shell_options (privileged_mode||running_setuid);
  initialize_bashopts (privileged_mode||running_setuid);
#endif
}

/* Function called by main () when it appears that the shell has already
   had some initialization performed.  This is supposed to reset the world
   back to a pristine state, as if we had been exec'ed. */
static void
shell_reinitialize ()
{
  /* The default shell prompts. */
  primary_prompt = PPROMPT;
  secondary_prompt = SPROMPT;

  /* Things that get 1. */
  current_command_number = 1;

  /* We have decided that the ~/.bashrc file should not be executed
     for the invocation of each shell script.  If the variable $ENV
     (or $BASH_ENV) is set, its value is used as the name of a file
     to source. */
  no_rc = no_profile = 1;

  /* Things that get 0. */
  login_shell = make_login_shell = interactive = executing = 0;
  debugging = do_version = line_number = last_command_exit_value = 0;
  forced_interactive = interactive_shell = subshell_environment = 0;
  expand_aliases = 0;

#if defined (HISTORY)
  bash_history_reinit (0);
#endif /* HISTORY */

#if defined (RESTRICTED_SHELL)
  restricted = 0;
#endif /* RESTRICTED_SHELL */

  /* Ensure that the default startup file is used.  (Except that we don't
     execute this file for reinitialized shells). */
  bashrc_file = "~/.bashrc";

  /* Delete all variables and functions.  They will be reinitialized when
     the environment is parsed. */
  delete_all_contexts (shell_variables);
  delete_all_variables (shell_functions);

  reinit_special_variables ();

#if defined (READLINE)
  bashline_reinitialize ();
#endif

  shell_reinitialized = 1;
}

static void
show_shell_usage (fp, extra)
     FILE *fp;
     int extra;
{
  int i;
  char *set_opts, *s, *t;

  if (extra)
    fprintf (fp, _("GNU bash, version %s-(%s)\n"), shell_version_string (), MACHTYPE);
  fprintf (fp, _("Usage:\t%s [GNU long option] [option] ...\n\t%s [GNU long option] [option] script-file ...\n"),
	     shell_name, shell_name);
  fputs (_("GNU long options:\n"), fp);
  for (i = 0; long_args[i].name; i++)
    fprintf (fp, "\t--%s\n", long_args[i].name);

  fputs (_("Shell options:\n"), fp);
  fputs (_("\t-irsD or -c command or -O shopt_option\t\t(invocation only)\n"), fp);

  for (i = 0, set_opts = 0; shell_builtins[i].name; i++)
    if (STREQ (shell_builtins[i].name, "set"))
      set_opts = savestring (shell_builtins[i].short_doc);
  if (set_opts)
    {
      s = strchr (set_opts, '[');
      if (s == 0)
	s = set_opts;
      while (*++s == '-')
	;
      t = strchr (s, ']');
      if (t)
	*t = '\0';
      fprintf (fp, _("\t-%s or -o option\n"), s);
      free (set_opts);
    }

  if (extra)
    {
      fprintf (fp, _("Type `%s -c \"help set\"' for more information about shell options.\n"), shell_name);
      fprintf (fp, _("Type `%s -c help' for more information about shell builtin commands.\n"), shell_name);
      fprintf (fp, _("Use the `bashbug' command to report bugs.\n"));
    }
}

static void
add_shopt_to_alist (opt, on_or_off)
     char *opt;
     int on_or_off;
{
  if (shopt_ind >= shopt_len)
    {
      shopt_len += 8;
      shopt_alist = (STRING_INT_ALIST *)xrealloc (shopt_alist, shopt_len * sizeof (shopt_alist[0]));
    }
  shopt_alist[shopt_ind].word = opt;
  shopt_alist[shopt_ind].token = on_or_off;
  shopt_ind++;
}

static void
run_shopt_alist ()
{
  register int i;

  for (i = 0; i < shopt_ind; i++)
    if (shopt_setopt (shopt_alist[i].word, (shopt_alist[i].token == '-')) != EXECUTION_SUCCESS)
      exit (EX_BADUSAGE);
  free (shopt_alist);
  shopt_alist = 0;
  shopt_ind = shopt_len = 0;
}