shell.c

android-w.song.android.widget

     restore the original terminal process group.  Don't do this if we're
     in a subshell and calling exit_shell after, for example, a failed
     word expansion. */
  if (subshell_environment == 0)
    end_job_control ();
#endif /* JOB_CONTROL */

  /* Always return the exit status of the last command to our parent. */
  sh_exit (s);
}

/* A wrapper for exit that (optionally) can do other things, like malloc
   statistics tracing. */
void
sh_exit (s)
     int s;
{
#if defined (MALLOC_DEBUG) && defined (USING_BASH_MALLOC)
  if (malloc_trace_at_exit)
    trace_malloc_stats (get_name_for_error (), (char *)NULL);
#endif

  exit (s);
}

/* Source the bash startup files.  If POSIXLY_CORRECT is non-zero, we obey
   the Posix.2 startup file rules:  $ENV is expanded, and if the file it
   names exists, that file is sourced.  The Posix.2 rules are in effect
   for interactive shells only. (section 4.56.5.3) */

/* Execute ~/.bashrc for most shells.  Never execute it if
   ACT_LIKE_SH is set, or if NO_RC is set.

   If the executable file "/usr/gnu/src/bash/foo" contains:

   #!/usr/gnu/bin/bash
   echo hello

   then:

	 COMMAND	    EXECUTE BASHRC
	 --------------------------------
	 bash -c foo		NO
	 bash foo		NO
	 foo			NO
	 rsh machine ls		YES (for rsh, which calls `bash -c')
	 rsh machine foo	YES (for shell started by rsh) NO (for foo!)
	 echo ls | bash		NO
	 login			NO
	 bash			YES
*/

static void
execute_env_file (env_file)
      char *env_file;
{
  char *fn;

  if (env_file && *env_file)
    {
      fn = expand_string_unsplit_to_string (env_file, Q_DOUBLE_QUOTES);
      if (fn && *fn)
	maybe_execute_file (fn, 1);
      FREE (fn);
    }
}

static void
run_startup_files ()
{
#if defined (JOB_CONTROL)
  int old_job_control;
#endif
  int sourced_login, run_by_ssh;

  /* get the rshd/sshd case out of the way first. */
  if (interactive_shell == 0 && no_rc == 0 && login_shell == 0 &&
      act_like_sh == 0 && command_execution_string)
    {
#ifdef SSH_SOURCE_BASHRC
      run_by_ssh = (find_variable ("SSH_CLIENT") != (SHELL_VAR *)0) ||
		   (find_variable ("SSH2_CLIENT") != (SHELL_VAR *)0);
#else
      run_by_ssh = 0;
#endif

      /* If we were run by sshd or we think we were run by rshd, execute
	 ~/.bashrc if we are a top-level shell. */
      if ((run_by_ssh || isnetconn (fileno (stdin))) && shell_level < 2)
	{
#ifdef SYS_BASHRC
#  if defined (__OPENNT)
	  maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
#  else
	  maybe_execute_file (SYS_BASHRC, 1);
#  endif
#endif
	  maybe_execute_file (bashrc_file, 1);
	  return;
	}
    }

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif

  sourced_login = 0;

  /* A shell begun with the --login (or -l) flag that is not in posix mode
     runs the login shell startup files, no matter whether or not it is
     interactive.  If NON_INTERACTIVE_LOGIN_SHELLS is defined, run the
     startup files if argv[0][0] == '-' as well. */
#if defined (NON_INTERACTIVE_LOGIN_SHELLS)
  if (login_shell && posixly_correct == 0)
#else
  if (login_shell < 0 && posixly_correct == 0)
#endif
    {
      /* We don't execute .bashrc for login shells. */
      no_rc++;

      /* Execute /etc/profile and one of the personal login shell
	 initialization files. */
      if (no_profile == 0)
	{
	  maybe_execute_file (SYS_PROFILE, 1);

	  if (act_like_sh)	/* sh */
	    maybe_execute_file ("~/.profile", 1);
	  else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) &&
		   (maybe_execute_file ("~/.bash_login", 1) == 0))	/* bash */
	    maybe_execute_file ("~/.profile", 1);
	}

      sourced_login = 1;
    }

  /* A non-interactive shell not named `sh' and not in posix mode reads and
     executes commands from $BASH_ENV.  If `su' starts a shell with `-c cmd'
     and `-su' as the name of the shell, we want to read the startup files.
     No other non-interactive shells read any startup files. */
  if (interactive_shell == 0 && !(su_shell && login_shell))
    {
      if (posixly_correct == 0 && act_like_sh == 0 && privileged_mode == 0 &&
	    sourced_env++ == 0)
	execute_env_file (get_string_value ("BASH_ENV"));
      return;
    }

  /* Interactive shell or `-su' shell. */
  if (posixly_correct == 0)		  /* bash, sh */
    {
      if (login_shell && sourced_login++ == 0)
	{
	  /* We don't execute .bashrc for login shells. */
	  no_rc++;

	  /* Execute /etc/profile and one of the personal login shell
	     initialization files. */
	  if (no_profile == 0)
	    {
	      maybe_execute_file (SYS_PROFILE, 1);

	      if (act_like_sh)	/* sh */
		maybe_execute_file ("~/.profile", 1);
	      else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) &&
		       (maybe_execute_file ("~/.bash_login", 1) == 0))	/* bash */
		maybe_execute_file ("~/.profile", 1);
	    }
	}

      /* bash */
      if (act_like_sh == 0 && no_rc == 0)
	{
#ifdef SYS_BASHRC
#  if defined (__OPENNT)
	  maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
#  else
	  maybe_execute_file (SYS_BASHRC, 1);
#  endif
#endif
	  maybe_execute_file (bashrc_file, 1);
	}
      /* sh */
      else if (act_like_sh && privileged_mode == 0 && sourced_env++ == 0)
	execute_env_file (get_string_value ("ENV"));
    }
  else		/* bash --posix, sh --posix */
    {
      /* bash and sh */
      if (interactive_shell && privileged_mode == 0 && sourced_env++ == 0)
	execute_env_file (get_string_value ("ENV"));
    }

#if defined (JOB_CONTROL)
  set_job_control (old_job_control);
#endif
}

#if defined (RESTRICTED_SHELL)
/* Return 1 if the shell should be a restricted one based on NAME or the
   value of `restricted'.  Don't actually do anything, just return a
   boolean value. */
int
shell_is_restricted (name)
     char *name;
{
  char *temp;

  if (restricted)
    return 1;
  temp = base_pathname (name);
  if (*temp == '-')
    temp++;
  return (STREQ (temp, RESTRICTED_SHELL_NAME));
}

/* Perhaps make this shell a `restricted' one, based on NAME.  If the
   basename of NAME is "rbash", then this shell is restricted.  The
   name of the restricted shell is a configurable option, see config.h.
   In a restricted shell, PATH, SHELL, ENV, and BASH_ENV are read-only
   and non-unsettable.
   Do this also if `restricted' is already set to 1; maybe the shell was
   started with -r. */
int
maybe_make_restricted (name)
     char *name;
{
  char *temp;

  temp = base_pathname (name);
  if (*temp == '-')
    temp++;
  if (restricted || (STREQ (temp, RESTRICTED_SHELL_NAME)))
    {
      set_var_read_only ("PATH");
      set_var_read_only ("SHELL");
      set_var_read_only ("ENV");
      set_var_read_only ("BASH_ENV");
      restricted = 1;
    }
  return (restricted);
}
#endif /* RESTRICTED_SHELL */

/* Fetch the current set of uids and gids and return 1 if we're running
   setuid or setgid. */
static int
uidget ()
{
  uid_t u;

  u = getuid ();
  if (current_user.uid != u)
    {
      FREE (current_user.user_name);
      FREE (current_user.shell);
      FREE (current_user.home_dir);
      current_user.user_name = current_user.shell = current_user.home_dir = (char *)NULL;
    }
  current_user.uid = u;
  current_user.gid = getgid ();
  current_user.euid = geteuid ();
  current_user.egid = getegid ();

  /* See whether or not we are running setuid or setgid. */
  return (current_user.uid != current_user.euid) ||
	   (current_user.gid != current_user.egid);
}

void
disable_priv_mode ()
{
  setuid (current_user.uid);
  setgid (current_user.gid);
  current_user.euid = current_user.uid;
  current_user.egid = current_user.gid;
}

#if defined (WORDEXP_OPTION)
static int
run_wordexp (words)
     char *words;
{
  int code, nw, nb;
  WORD_LIST *wl, *tl, *result;

  code = setjmp (top_level);

  if (code != NOT_JUMPED)
    {
      switch (code)
	{
	  /* Some kind of throw to top_level has occured. */
	case FORCE_EOF:
	  return last_command_exit_value = 127;
	case ERREXIT:
	case EXITPROG:
	  return last_command_exit_value;
	case DISCARD:
	  return last_command_exit_value = 1;
	default:
	  command_error ("run_wordexp", CMDERR_BADJUMP, code, 0);
	}
    }

  /* Run it through the parser to get a list of words and expand them */
  if (words && *words)
    {
      with_input_from_string (words, "--wordexp");
      if (parse_command () != 0)
	return (126);
      if (global_command == 0)
	{
	  printf ("0\n0\n");
	  return (0);
	}
      if (global_command->type != cm_simple)
	return (126);
      wl = global_command->value.Simple->words;
      if (protected_mode)
	for (tl = wl; tl; tl = tl->next)
	  tl->word->flags |= W_NOCOMSUB|W_NOPROCSUB;
      result = wl ? expand_words_no_vars (wl) : (WORD_LIST *)0;
    }
  else
    result = (WORD_LIST *)0;

  last_command_exit_value = 0;

  if (result == 0)
    {
      printf ("0\n0\n");
      return (0);
    }

  /* Count up the number of words and bytes, and print them.  Don't count
     the trailing NUL byte. */
  for (nw = nb = 0, wl = result; wl; wl = wl->next)
    {
      nw++;
      nb += strlen (wl->word->word);
    }
  printf ("%u\n%u\n", nw, nb);
  /* Print each word on a separate line.  This will have to be changed when
     the interface to glibc is completed. */
  for (wl = result; wl; wl = wl->next)
    printf ("%s\n", wl->word->word);

  return (0);
}
#endif

#if defined (ONESHOT)
/* Run one command, given as the argument to the -c option.  Tell
   parse_and_execute not to fork for a simple command. */
static int
run_one_command (command)
     char *command;
{
  int code;

  code = setjmp (top_level);

  if (code != NOT_JUMPED)
    {
#if defined (PROCESS_SUBSTITUTION)
      unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */
      switch (code)
	{
	  /* Some kind of throw to top_level has occured. */
	case FORCE_EOF:
	  return last_command_exit_value = 127;
	case ERREXIT:
	case EXITPROG:
	  return last_command_exit_value;
	case DISCARD:
	  return last_command_exit_value = 1;
	default:
	  command_error ("run_one_command", CMDERR_BADJUMP, code, 0);
	}
    }
   return (parse_and_execute (savestring (command), "-c", SEVAL_NOHIST));
}
#endif /* ONESHOT */

static int
bind_args (argv, arg_start, arg_end, start_index)
     char **argv;
     int arg_start, arg_end, start_index;
{
  register int i;
  WORD_LIST *args;

  for (i = arg_start, args = (WORD_LIST *)NULL; i < arg_end; i++)
    args = make_word_list (make_word (argv[i]), args);
  if (args)
    {
      args = REVERSE_LIST (args, WORD_LIST *);
      if (start_index == 0)	/* bind to $0...$n for sh -c command */
	{
	  /* Posix.2 4.56.3 says that the first argument after sh -c command
	     becomes $0, and the rest of the arguments become $1...$n */
	  shell_name = savestring (args->word->word);
	  FREE (dollar_vars[0]);
	  dollar_vars[0] = savestring (args->word->word);
	  remember_args (args->next, 1);
	  push_args (args->next);	/* BASH_ARGV and BASH_ARGC */
	}
      else			/* bind to $1...$n for shell script */
        {
	  remember_args (args, 1);
	  push_args (args);		/* BASH_ARGV and BASH_ARGC */
        }

      dispose_words (args);
    }

  return (i);
}

void
unbind_args ()
{
  remember_args ((WORD_LIST *)NULL, 1);
  pop_args ();				/* Reset BASH_ARGV and BASH_ARGC */
}

static void
start_debugger ()
{
#if defined (DEBUGGER) && defined (DEBUGGER_START_FILE)
  int old_errexit;

  old_errexit = exit_immediately_on_error;
  exit_immediately_on_error = 0;

  maybe_execute_file (DEBUGGER_START_FILE, 1);
  function_trace_mode = 1;

  exit_immediately_on_error += old_errexit;
#endif
}

static int
open_shell_script (script_name)
     char *script_name;
{
  int fd, e, fd_is_tty;
  char *filename, *path_filename, *t;
  char sample[80];
  int sample_len;
  struct stat sb;
#if defined (ARRAY_VARS)
  SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
  ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
#endif

  filename = savestring (script_name);

  fd = open (filename, O_RDONLY);
  if ((fd < 0) && (errno == ENOENT) && (absolute_program (filename) == 0))
    {