| /* shell.c -- GNU's idea of the POSIX shell specification. */ |
| |
| /* Copyright (C) 1987-2009 Free Software Foundation, Inc. |
| |
| This file is part of GNU Bash, the Bourne Again SHell. |
| |
| Bash 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 3 of the License, or |
| (at your option) any later version. |
| |
| Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| Birthdate: |
| Sunday, January 10th, 1988. |
| Initial author: Brian Fox |
| */ |
| #define INSTALL_DEBUG_MODE |
| |
| #include "config.h" |
| |
| #include "bashtypes.h" |
| #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
| # include <sys/file.h> |
| #endif |
| #include "posixstat.h" |
| #include "posixtime.h" |
| #include "bashansi.h" |
| #include <stdio.h> |
| #include <signal.h> |
| #include <errno.h> |
| #include "filecntl.h" |
| #include <pwd.h> |
| |
| #if defined (HAVE_UNISTD_H) |
| # include <unistd.h> |
| #endif |
| |
| #include "bashintl.h" |
| |
| #define NEED_SH_SETLINEBUF_DECL /* used in externs.h */ |
| |
| #include "shell.h" |
| #include "flags.h" |
| #include "trap.h" |
| #include "mailcheck.h" |
| #include "builtins.h" |
| #include "builtins/common.h" |
| |
| #if defined (JOB_CONTROL) |
| #include "jobs.h" |
| #endif /* JOB_CONTROL */ |
| |
| #include "input.h" |
| #include "execute_cmd.h" |
| #include "findcmd.h" |
| |
| #if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS) |
| # include <malloc/shmalloc.h> |
| #endif |
| |
| #if defined (HISTORY) |
| # include "bashhist.h" |
| # include <readline/history.h> |
| #endif |
| |
| #if defined (READLINE) |
| # include "bashline.h" |
| #endif |
| |
| #include <tilde/tilde.h> |
| #include <glob/strmatch.h> |
| |
| #if defined (__OPENNT) |
| # include <opennt/opennt.h> |
| #endif |
| |
| #if !defined (HAVE_GETPW_DECLS) |
| extern struct passwd *getpwuid (); |
| #endif /* !HAVE_GETPW_DECLS */ |
| |
| #if !defined (errno) |
| extern int errno; |
| #endif |
| |
| #if defined (NO_MAIN_ENV_ARG) |
| extern char **environ; /* used if no third argument to main() */ |
| #endif |
| |
| extern char *dist_version, *release_status; |
| extern int patch_level, build_version; |
| extern int shell_level; |
| extern int subshell_environment; |
| extern int last_command_exit_value; |
| extern int line_number; |
| extern int expand_aliases; |
| extern int array_needs_making; |
| extern int gnu_error_format; |
| extern char *primary_prompt, *secondary_prompt; |
| extern char *this_command_name; |
| |
| /* Non-zero means that this shell has already been run; i.e. you should |
| call shell_reinitialize () if you need to start afresh. */ |
| int shell_initialized = 0; |
| |
| COMMAND *global_command = (COMMAND *)NULL; |
| |
| /* Information about the current user. */ |
| struct user_info current_user = |
| { |
| (uid_t)-1, (uid_t)-1, (gid_t)-1, (gid_t)-1, |
| (char *)NULL, (char *)NULL, (char *)NULL |
| }; |
| |
| /* The current host's name. */ |
| char *current_host_name = (char *)NULL; |
| |
| /* Non-zero means that this shell is a login shell. |
| Specifically: |
| 0 = not login shell. |
| 1 = login shell from getty (or equivalent fake out) |
| -1 = login shell from "--login" (or -l) flag. |
| -2 = both from getty, and from flag. |
| */ |
| int login_shell = 0; |
| |
| /* Non-zero means that at this moment, the shell is interactive. In |
| general, this means that the shell is at this moment reading input |
| from the keyboard. */ |
| int interactive = 0; |
| |
| /* Non-zero means that the shell was started as an interactive shell. */ |
| int interactive_shell = 0; |
| |
| /* Non-zero means to send a SIGHUP to all jobs when an interactive login |
| shell exits. */ |
| int hup_on_exit = 0; |
| |
| /* Non-zero means to list status of running and stopped jobs at shell exit */ |
| int check_jobs_at_exit = 0; |
| |
| /* Non-zero means to change to a directory name supplied as a command name */ |
| int autocd = 0; |
| |
| /* Tells what state the shell was in when it started: |
| 0 = non-interactive shell script |
| 1 = interactive |
| 2 = -c command |
| 3 = wordexp evaluation |
| This is a superset of the information provided by interactive_shell. |
| */ |
| int startup_state = 0; |
| |
| /* Special debugging helper. */ |
| int debugging_login_shell = 0; |
| |
| /* The environment that the shell passes to other commands. */ |
| char **shell_environment; |
| |
| /* Non-zero when we are executing a top-level command. */ |
| int executing = 0; |
| |
| /* The number of commands executed so far. */ |
| int current_command_number = 1; |
| |
| /* Non-zero is the recursion depth for commands. */ |
| int indirection_level = 0; |
| |
| /* The name of this shell, as taken from argv[0]. */ |
| char *shell_name = (char *)NULL; |
| |
| /* time in seconds when the shell was started */ |
| time_t shell_start_time; |
| |
| /* Are we running in an emacs shell window? */ |
| int running_under_emacs; |
| |
| /* Do we have /dev/fd? */ |
| #ifdef HAVE_DEV_FD |
| int have_devfd = HAVE_DEV_FD; |
| #else |
| int have_devfd = 0; |
| #endif |
| |
| /* The name of the .(shell)rc file. */ |
| static char *bashrc_file = "~/.bashrc"; |
| |
| /* Non-zero means to act more like the Bourne shell on startup. */ |
| static int act_like_sh; |
| |
| /* Non-zero if this shell is being run by `su'. */ |
| static int su_shell; |
| |
| /* Non-zero if we have already expanded and sourced $ENV. */ |
| static int sourced_env; |
| |
| /* Is this shell running setuid? */ |
| static int running_setuid; |
| |
| /* Values for the long-winded argument names. */ |
| static int debugging; /* Do debugging things. */ |
| static int no_rc; /* Don't execute ~/.bashrc */ |
| static int no_profile; /* Don't execute .profile */ |
| static int do_version; /* Display interesting version info. */ |
| static int make_login_shell; /* Make this shell be a `-bash' shell. */ |
| static int want_initial_help; /* --help option */ |
| |
| int debugging_mode = 0; /* In debugging mode with --debugger */ |
| int no_line_editing = 0; /* Don't do fancy line editing. */ |
| int dump_translatable_strings; /* Dump strings in $"...", don't execute. */ |
| int dump_po_strings; /* Dump strings in $"..." in po format */ |
| int wordexp_only = 0; /* Do word expansion only */ |
| int protected_mode = 0; /* No command substitution with --wordexp */ |
| |
| #if defined (STRICT_POSIX) |
| int posixly_correct = 1; /* Non-zero means posix.2 superset. */ |
| #else |
| int posixly_correct = 0; /* Non-zero means posix.2 superset. */ |
| #endif |
| |
| |
| /* Some long-winded argument names. These are obviously new. */ |
| #define Int 1 |
| #define Charp 2 |
| static const struct { |
| const char *name; |
| int type; |
| int *int_value; |
| char **char_value; |
| } long_args[] = { |
| { "debug", Int, &debugging, (char **)0x0 }, |
| #if defined (DEBUGGER) |
| { "debugger", Int, &debugging_mode, (char **)0x0 }, |
| #endif |
| { "dump-po-strings", Int, &dump_po_strings, (char **)0x0 }, |
| { "dump-strings", Int, &dump_translatable_strings, (char **)0x0 }, |
| { "help", Int, &want_initial_help, (char **)0x0 }, |
| { "init-file", Charp, (int *)0x0, &bashrc_file }, |
| { "login", Int, &make_login_shell, (char **)0x0 }, |
| { "noediting", Int, &no_line_editing, (char **)0x0 }, |
| { "noprofile", Int, &no_profile, (char **)0x0 }, |
| { "norc", Int, &no_rc, (char **)0x0 }, |
| { "posix", Int, &posixly_correct, (char **)0x0 }, |
| { "protected", Int, &protected_mode, (char **)0x0 }, |
| { "rcfile", Charp, (int *)0x0, &bashrc_file }, |
| #if defined (RESTRICTED_SHELL) |
| { "restricted", Int, &restricted, (char **)0x0 }, |
| #endif |
| { "verbose", Int, &echo_input_at_read, (char **)0x0 }, |
| { "version", Int, &do_version, (char **)0x0 }, |
| { "wordexp", Int, &wordexp_only, (char **)0x0 }, |
| { (char *)0x0, Int, (int *)0x0, (char **)0x0 } |
| }; |
| |
| /* These are extern so execute_simple_command can set them, and then |
| longjmp back to main to execute a shell script, instead of calling |
| main () again and resulting in indefinite, possibly fatal, stack |
| growth. */ |
| procenv_t subshell_top_level; |
| int subshell_argc; |
| char **subshell_argv; |
| char **subshell_envp; |
| |
| #if defined (BUFFERED_INPUT) |
| /* The file descriptor from which the shell is reading input. */ |
| int default_buffered_input = -1; |
| #endif |
| |
| /* The following two variables are not static so they can show up in $-. */ |
| int read_from_stdin; /* -s flag supplied */ |
| int want_pending_command; /* -c flag supplied */ |
| |
| /* This variable is not static so it can be bound to $BASH_EXECUTION_STRING */ |
| char *command_execution_string; /* argument to -c option */ |
| |
| int malloc_trace_at_exit = 0; |
| |
| static int shell_reinitialized = 0; |
| |
| static FILE *default_input; |
| |
| static STRING_INT_ALIST *shopt_alist; |
| static int shopt_ind = 0, shopt_len = 0; |
| |
| static int parse_long_options __P((char **, int, int)); |
| static int parse_shell_options __P((char **, int, int)); |
| static int bind_args __P((char **, int, int, int)); |
| |
| static void start_debugger __P((void)); |
| |
| static void add_shopt_to_alist __P((char *, int)); |
| static void run_shopt_alist __P((void)); |
| |
| static void execute_env_file __P((char *)); |
| static void run_startup_files __P((void)); |
| static int open_shell_script __P((char *)); |
| static void set_bash_input __P((void)); |
| static int run_one_command __P((char *)); |
| static int run_wordexp __P((char *)); |
| |
| static int uidget __P((void)); |
| |
| static void init_interactive __P((void)); |
| static void init_noninteractive __P((void)); |
| static void init_interactive_script __P((void)); |
| |
| static void set_shell_name __P((char *)); |
| static void shell_initialize __P((void)); |
| static void shell_reinitialize __P((void)); |
| |
| static void show_shell_usage __P((FILE *, int)); |
| |
| #ifdef __CYGWIN__ |
| static void |
| _cygwin32_check_tmp () |
| { |
| struct stat sb; |
| |
| if (stat ("/tmp", &sb) < 0) |
| internal_warning (_("could not find /tmp, please create!")); |
| else |
| { |
| if (S_ISDIR (sb.st_mode) == 0) |
| internal_warning (_("/tmp must be a valid directory name")); |
| } |
| } |
| #endif /* __CYGWIN__ */ |
| |
| #if defined (NO_MAIN_ENV_ARG) |
| /* systems without third argument to main() */ |
| int |
| main (argc, argv) |
| int argc; |
| char **argv; |
| #else /* !NO_MAIN_ENV_ARG */ |
| int |
| main (argc, argv, env) |
| int argc; |
| char **argv, **env; |
| #endif /* !NO_MAIN_ENV_ARG */ |
| { |
| register int i; |
| int code, old_errexit_flag; |
| #if defined (RESTRICTED_SHELL) |
| int saverst; |
| #endif |
| volatile int locally_skip_execution; |
| volatile int arg_index, top_level_arg_index; |
| #ifdef __OPENNT |
| char **env; |
| |
| env = environ; |
| #endif /* __OPENNT */ |
| |
| USE_VAR(argc); |
| USE_VAR(argv); |
| USE_VAR(env); |
| USE_VAR(code); |
| USE_VAR(old_errexit_flag); |
| #if defined (RESTRICTED_SHELL) |
| USE_VAR(saverst); |
| #endif |
| |
| /* Catch early SIGINTs. */ |
| code = setjmp (top_level); |
| if (code) |
| exit (2); |
| |
| #if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS) |
| # if 1 |
| malloc_set_register (1); |
| # endif |
| #endif |
| |
| check_dev_tty (); |
| |
| #ifdef __CYGWIN__ |
| _cygwin32_check_tmp (); |
| #endif /* __CYGWIN__ */ |
| |
| /* Wait forever if we are debugging a login shell. */ |
| while (debugging_login_shell) sleep (3); |
| |
| set_default_locale (); |
| |
| running_setuid = uidget (); |
| |
| if (getenv ("POSIXLY_CORRECT") || getenv ("POSIX_PEDANTIC")) |
| posixly_correct = 1; |
| |
| #if defined (USE_GNU_MALLOC_LIBRARY) |
| mcheck (programming_error, (void (*) ())0); |
| #endif /* USE_GNU_MALLOC_LIBRARY */ |
| |
| if (setjmp (subshell_top_level)) |
| { |
| argc = subshell_argc; |
| argv = subshell_argv; |
| env = subshell_envp; |
| sourced_env = 0; |
| } |
| |
| shell_reinitialized = 0; |
| |
| /* Initialize `local' variables for all `invocations' of main (). */ |
| arg_index = 1; |
| if (arg_index > argc) |
| arg_index = argc; |
| command_execution_string = (char *)NULL; |
| want_pending_command = locally_skip_execution = read_from_stdin = 0; |
| default_input = stdin; |
| #if defined (BUFFERED_INPUT) |
| default_buffered_input = -1; |
| #endif |
| |
| /* Fix for the `infinite process creation' bug when running shell scripts |
| from startup files on System V. */ |
| login_shell = make_login_shell = 0; |
| |
| /* If this shell has already been run, then reinitialize it to a |
| vanilla state. */ |
| if (shell_initialized || shell_name) |
| { |
| /* Make sure that we do not infinitely recurse as a login shell. */ |
| if (*shell_name == '-') |
| shell_name++; |
| |
| shell_reinitialize (); |
| if (setjmp (top_level)) |
| exit (2); |
| } |
| |
| shell_environment = env; |
| set_shell_name (argv[0]); |
| shell_start_time = NOW; /* NOW now defined in general.h */ |
| |
| /* Parse argument flags from the input line. */ |
| |
| /* Find full word arguments first. */ |
| arg_index = parse_long_options (argv, arg_index, argc); |
| |
| if (want_initial_help) |
| { |
| show_shell_usage (stdout, 1); |
| exit (EXECUTION_SUCCESS); |
| } |
| |
| if (do_version) |
| { |
| show_shell_version (1); |
| exit (EXECUTION_SUCCESS); |
| } |
| |
| /* All done with full word options; do standard shell option parsing.*/ |
| this_command_name = shell_name; /* for error reporting */ |
| arg_index = parse_shell_options (argv, arg_index, argc); |
| |
| /* If user supplied the "--login" (or -l) flag, then set and invert |
| LOGIN_SHELL. */ |
| if (make_login_shell) |
| { |
| login_shell++; |
| login_shell = -login_shell; |
| } |
| |
| set_login_shell (login_shell != 0); |
| |
| if (dump_po_strings) |
| dump_translatable_strings = 1; |
| |
| if (dump_translatable_strings) |
| read_but_dont_execute = 1; |
| |
| if (running_setuid && privileged_mode == 0) |
| disable_priv_mode (); |
| |
| /* Need to get the argument to a -c option processed in the |
| above loop. The next arg is a command to execute, and the |
| following args are $0...$n respectively. */ |
| if (want_pending_command) |
| { |
| command_execution_string = argv[arg_index]; |
| if (command_execution_string == 0) |
| { |
| report_error (_("%s: option requires an argument"), "-c"); |
| exit (EX_BADUSAGE); |
| } |
| arg_index++; |
| } |
| this_command_name = (char *)NULL; |
| |
| cmd_init(); /* initialize the command object caches */ |
| |
| /* First, let the outside world know about our interactive status. |
| A shell is interactive if the `-i' flag was given, or if all of |
| the following conditions are met: |
| no -c command |
| no arguments remaining or the -s flag given |
| standard input is a terminal |
| standard error is a terminal |
| Refer to Posix.2, the description of the `sh' utility. */ |
| |
| if (forced_interactive || /* -i flag */ |
| (!command_execution_string && /* No -c command and ... */ |
| wordexp_only == 0 && /* No --wordexp and ... */ |
| ((arg_index == argc) || /* no remaining args or... */ |
| read_from_stdin) && /* -s flag with args, and */ |
| isatty (fileno (stdin)) && /* Input is a terminal and */ |
| isatty (fileno (stderr)))) /* error output is a terminal. */ |
| init_interactive (); |
| else |
| init_noninteractive (); |
| |
| #define CLOSE_FDS_AT_LOGIN |
| #if defined (CLOSE_FDS_AT_LOGIN) |
| /* |
| * Some systems have the bad habit of starting login shells with lots of open |
| * file descriptors. For instance, most systems that have picked up the |
| * pre-4.0 Sun YP code leave a file descriptor open each time you call one |
| * of the getpw* functions, and it's set to be open across execs. That |
| * means one for login, one for xterm, one for shelltool, etc. |
| */ |
| if (login_shell && interactive_shell) |
| { |
| for (i = 3; i < 20; i++) |
| close (i); |
| } |
| #endif /* CLOSE_FDS_AT_LOGIN */ |
| |
| /* If we're in a strict Posix.2 mode, turn on interactive comments, |
| alias expansion in non-interactive shells, and other Posix.2 things. */ |
| if (posixly_correct) |
| { |
| bind_variable ("POSIXLY_CORRECT", "y", 0); |
| sv_strict_posix ("POSIXLY_CORRECT"); |
| } |
| |
| /* Now we run the shopt_alist and process the options. */ |
| if (shopt_alist) |
| run_shopt_alist (); |
| |
| /* From here on in, the shell must be a normal functioning shell. |
| Variables from the environment are expected to be set, etc. */ |
| shell_initialize (); |
| |
| set_default_lang (); |
| set_default_locale_vars (); |
| |
| /* |
| * M-x term -> TERM=eterm EMACS=22.1 (term:0.96) (eterm) |
| * M-x shell -> TERM=dumb EMACS=t (no line editing) |
| * M-x terminal -> TERM=emacs-em7955 EMACS= (line editing) |
| */ |
| if (interactive_shell) |
| { |
| char *term, *emacs; |
| |
| term = get_string_value ("TERM"); |
| emacs = get_string_value ("EMACS"); |
| |
| /* Not sure any emacs terminal emulator sets TERM=emacs any more */ |
| no_line_editing |= term && (STREQ (term, "emacs")); |
| no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0' && STREQ (term, "dumb"); |
| |
| /* running_under_emacs == 2 for `eterm' */ |
| running_under_emacs = (emacs != 0) || (term && STREQN (term, "emacs", 5)); |
| running_under_emacs += term && STREQN (term, "eterm", 5) && strstr (emacs, "term"); |
| |
| if (running_under_emacs) |
| gnu_error_format = 1; |
| } |
| |
| top_level_arg_index = arg_index; |
| old_errexit_flag = exit_immediately_on_error; |
| |
| /* Give this shell a place to longjmp to before executing the |
| startup files. This allows users to press C-c to abort the |
| lengthy startup. */ |
| code = setjmp (top_level); |
| if (code) |
| { |
| if (code == EXITPROG || code == ERREXIT) |
| exit_shell (last_command_exit_value); |
| else |
| { |
| #if defined (JOB_CONTROL) |
| /* Reset job control, since run_startup_files turned it off. */ |
| set_job_control (interactive_shell); |
| #endif |
| /* Reset value of `set -e', since it's turned off before running |
| the startup files. */ |
| exit_immediately_on_error += old_errexit_flag; |
| locally_skip_execution++; |
| } |
| } |
| |
| arg_index = top_level_arg_index; |
| |
| /* Execute the start-up scripts. */ |
| |
| if (interactive_shell == 0) |
| { |
| unbind_variable ("PS1"); |
| unbind_variable ("PS2"); |
| interactive = 0; |
| #if 0 |
| /* This has already been done by init_noninteractive */ |
| expand_aliases = posixly_correct; |
| #endif |
| } |
| else |
| { |
| change_flag ('i', FLAG_ON); |
| interactive = 1; |
| } |
| |
| #if defined (RESTRICTED_SHELL) |
| /* Set restricted_shell based on whether the basename of $0 indicates that |
| the shell should be restricted or if the `-r' option was supplied at |
| startup. */ |
| restricted_shell = shell_is_restricted (shell_name); |
| |
| /* If the `-r' option is supplied at invocation, make sure that the shell |
| is not in restricted mode when running the startup files. */ |
| saverst = restricted; |
| restricted = 0; |
| #endif |
| |
| /* The startup files are run with `set -e' temporarily disabled. */ |
| if (locally_skip_execution == 0 && running_setuid == 0) |
| { |
| old_errexit_flag = exit_immediately_on_error; |
| exit_immediately_on_error = 0; |
| |
| run_startup_files (); |
| exit_immediately_on_error += old_errexit_flag; |
| } |
| |
| /* If we are invoked as `sh', turn on Posix mode. */ |
| if (act_like_sh) |
| { |
| bind_variable ("POSIXLY_CORRECT", "y", 0); |
| sv_strict_posix ("POSIXLY_CORRECT"); |
| } |
| |
| #if defined (RESTRICTED_SHELL) |
| /* Turn on the restrictions after executing the startup files. This |
| means that `bash -r' or `set -r' invoked from a startup file will |
| turn on the restrictions after the startup files are executed. */ |
| restricted = saverst || restricted; |
| if (shell_reinitialized == 0) |
| maybe_make_restricted (shell_name); |
| #endif /* RESTRICTED_SHELL */ |
| |
| if (wordexp_only) |
| { |
| startup_state = 3; |
| last_command_exit_value = run_wordexp (argv[arg_index]); |
| exit_shell (last_command_exit_value); |
| } |
| |
| if (command_execution_string) |
| { |
| arg_index = bind_args (argv, arg_index, argc, 0); |
| startup_state = 2; |
| |
| if (debugging_mode) |
| start_debugger (); |
| |
| #if defined (ONESHOT) |
| executing = 1; |
| run_one_command (command_execution_string); |
| exit_shell (last_command_exit_value); |
| #else /* ONESHOT */ |
| with_input_from_string (command_execution_string, "-c"); |
| goto read_and_execute; |
| #endif /* !ONESHOT */ |
| } |
| |
| /* Get possible input filename and set up default_buffered_input or |
| default_input as appropriate. */ |
| if (arg_index != argc && read_from_stdin == 0) |
| { |
| open_shell_script (argv[arg_index]); |
| arg_index++; |
| } |
| else if (interactive == 0) |
| /* In this mode, bash is reading a script from stdin, which is a |
| pipe or redirected file. */ |
| #if defined (BUFFERED_INPUT) |
| default_buffered_input = fileno (stdin); /* == 0 */ |
| #else |
| setbuf (default_input, (char *)NULL); |
| #endif /* !BUFFERED_INPUT */ |
| |
| set_bash_input (); |
| |
| /* Bind remaining args to $1 ... $n */ |
| arg_index = bind_args (argv, arg_index, argc, 1); |
| |
| if (debugging_mode && locally_skip_execution == 0 && running_setuid == 0) |
| start_debugger (); |
| |
| /* Do the things that should be done only for interactive shells. */ |
| if (interactive_shell) |
| { |
| /* Set up for checking for presence of mail. */ |
| reset_mail_timer (); |
| init_mail_dates (); |
| |
| #if defined (HISTORY) |
| /* Initialize the interactive history stuff. */ |
| bash_initialize_history (); |
| /* Don't load the history from the history file if we've already |
| saved some lines in this session (e.g., by putting `history -s xx' |
| into one of the startup files). */ |
| if (shell_initialized == 0 && history_lines_this_session == 0) |
| load_history (); |
| #endif /* HISTORY */ |
| |
| /* Initialize terminal state for interactive shells after the |
| .bash_profile and .bashrc are interpreted. */ |
| get_tty_state (); |
| } |
| |
| #if !defined (ONESHOT) |
| read_and_execute: |
| #endif /* !ONESHOT */ |
| |
| shell_initialized = 1; |
| |
| /* Read commands until exit condition. */ |
| reader_loop (); |
| exit_shell (last_command_exit_value); |
| } |
| |
| static int |
| parse_long_options (argv, arg_start, arg_end) |
| char **argv; |
| int arg_start, arg_end; |
| { |
| int arg_index, longarg, i; |
| char *arg_string; |
| |
| arg_index = arg_start; |
| while ((arg_index != arg_end) && (arg_string = argv[arg_index]) && |
| (*arg_string == '-')) |
| { |
| longarg = 0; |
| |
| /* Make --login equivalent to -login. */ |
| if (arg_string[1] == '-' && arg_string[2]) |
| { |
| longarg = 1; |
| arg_string++; |
| } |
| |
| for (i = 0; long_args[i].name; i++) |
| { |
| if (STREQ (arg_string + 1, long_args[i].name)) |
| { |
| if (long_args[i].type == Int) |
| *long_args[i].int_value = 1; |
| else if (argv[++arg_index] == 0) |
| { |
| report_error (_("%s: option requires an argument"), long_args[i].name); |
| exit (EX_BADUSAGE); |
| } |
| else |
| *long_args[i].char_value = argv[arg_index]; |
| |
| break; |
| } |
| } |
| if (long_args[i].name == 0) |
| { |
| if (longarg) |
| { |
| report_error (_("%s: invalid option"), argv[arg_index]); |
| show_shell_usage (stderr, 0); |
| exit (EX_BADUSAGE); |
| } |
| break; /* No such argument. Maybe flag arg. */ |
| } |
| |
| arg_index++; |
| } |
| |
| return (arg_index); |
| } |
| |
| static int |
| parse_shell_options (argv, arg_start, arg_end) |
| char **argv; |
| int arg_start, arg_end; |
| { |
| int arg_index; |
| int arg_character, on_or_off, next_arg, i; |
| char *o_option, *arg_string; |
| |
| arg_index = arg_start; |
| while (arg_index != arg_end && (arg_string = argv[arg_index]) && |
| (*arg_string == '-' || *arg_string == '+')) |
| { |
| /* There are flag arguments, so parse them. */ |
| next_arg = arg_index + 1; |
| |
| /* A single `-' signals the end of options. From the 4.3 BSD sh. |
| An option `--' means the same thing; this is the standard |
| getopt(3) meaning. */ |
| if (arg_string[0] == '-' && |
| (arg_string[1] == '\0' || |
| (arg_string[1] == '-' && arg_string[2] == '\0'))) |
| return (next_arg); |
| |
| i = 1; |
| on_or_off = arg_string[0]; |
| while (arg_character = arg_string[i++]) |
| { |
| switch (arg_character) |
| { |
| case 'c': |
| want_pending_command = 1; |
| break; |
| |
| case 'l': |
| make_login_shell = 1; |
| break; |
| |
| case 's': |
| read_from_stdin = 1; |
| break; |
| |
| case 'o': |
| o_option = argv[next_arg]; |
| if (o_option == 0) |
| { |
| list_minus_o_opts (-1, (on_or_off == '-') ? 0 : 1); |
| break; |
| } |
| if (set_minus_o_option (on_or_off, o_option) != EXECUTION_SUCCESS) |
| exit (EX_BADUSAGE); |
| next_arg++; |
| break; |
| |
| case 'O': |
| /* Since some of these can be overridden by the normal |
| interactive/non-interactive shell initialization or |
| initializing posix mode, we save the options and process |
| them after initialization. */ |
| o_option = argv[next_arg]; |
| if (o_option == 0) |
| { |
| shopt_listopt (o_option, (on_or_off == '-') ? 0 : 1); |
| break; |
| } |
| add_shopt_to_alist (o_option, on_or_off); |
| next_arg++; |
| break; |
| |
| case 'D': |
| dump_translatable_strings = 1; |
| break; |
| |
| default: |
| if (change_flag (arg_character, on_or_off) == FLAG_ERROR) |
| { |
| report_error (_("%c%c: invalid option"), on_or_off, arg_character); |
| show_shell_usage (stderr, 0); |
| exit (EX_BADUSAGE); |
| } |
| } |
| } |
| /* Can't do just a simple increment anymore -- what about |
| "bash -abouo emacs ignoreeof -hP"? */ |
| arg_index = next_arg; |
| } |
| |
| return (arg_index); |
| } |
| |
| /* Exit the shell with status S. */ |
| void |
| exit_shell (s) |
| int s; |
| { |
| /* Do trap[0] if defined. Allow it to override the exit status |
| passed to us. */ |
| if (signal_is_trapped (0)) |
| s = run_exit_trap (); |
| |
| #if defined (PROCESS_SUBSTITUTION) |
| unlink_fifo_list (); |
| #endif /* PROCESS_SUBSTITUTION */ |
| |
| #if defined (HISTORY) |
| if (interactive_shell) |
| maybe_save_shell_history (); |
| #endif /* HISTORY */ |
| |
| #if defined (COPROCESS_SUPPORT) |
| coproc_flush (); |
| #endif |
| |
| #if defined (JOB_CONTROL) |
| /* If the user has run `shopt -s huponexit', hangup all jobs when we exit |
| an interactive login shell. ksh does this unconditionally. */ |
| if (interactive_shell && login_shell && hup_on_exit) |
| hangup_all_jobs (); |
| |
| /* If this shell is interactive, terminate all stopped jobs and |
| 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; |
| } |
| |
| 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); |
| } |
| |
| #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)) |
| { |
| 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] = savestring (script_name); |
| |
| #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 (__CYGWIN__) && defined (O_TEXT) |
| setmode (fd, O_TEXT); |
| #endif |
| |
| #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 variable $SHELLOPTS 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); |
| #else |
| initialize_shell_options (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 = xstrchr (set_opts, '['); |
| if (s == 0) |
| s = set_opts; |
| while (*++s == '-') |
| ; |
| t = xstrchr (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; |
| } |