1 /* shell.c -- GNU's idea of the POSIX shell specification. */
3 /* Copyright (C) 1987-2002 Free Software Foundation, Inc.
5 This file is part of GNU Bash, the Bourne Again SHell.
7 Bash is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 Bash is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Bash; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
22 Sunday, January 10th, 1988.
23 Initial author: Brian Fox
25 #define INSTALL_DEBUG_MODE
29 #include "bashtypes.h"
31 # include <sys/file.h>
33 #include "posixstat.h"
34 #include "posixtime.h"
42 #if defined (HAVE_UNISTD_H)
46 #define NEED_SH_SETLINEBUF_DECL /* used in externs.h */
51 #include "mailcheck.h"
53 #include "builtins/common.h"
55 #if defined (JOB_CONTROL)
57 #endif /* JOB_CONTROL */
60 #include "execute_cmd.h"
63 #if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS)
64 # include <malloc/shmalloc.h>
68 # include "bashhist.h"
69 # include <readline/history.h>
72 #include <tilde/tilde.h>
73 #include <glob/strmatch.h>
75 #if defined (__OPENNT)
76 # include <opennt/opennt.h>
79 #if !defined (HAVE_GETPW_DECLS)
80 extern struct passwd *getpwuid ();
81 #endif /* !HAVE_GETPW_DECLS */
87 #if defined (NO_MAIN_ENV_ARG)
88 extern char **environ; /* used if no third argument to main() */
91 extern char *dist_version, *release_status;
92 extern int patch_level, build_version;
93 extern int shell_level;
94 extern int subshell_environment;
95 extern int last_command_exit_value;
96 extern int line_number;
97 extern char *primary_prompt, *secondary_prompt;
98 extern int expand_aliases;
99 extern char *this_command_name;
100 extern int array_needs_making;
102 /* Non-zero means that this shell has already been run; i.e. you should
103 call shell_reinitialize () if you need to start afresh. */
104 int shell_initialized = 0;
106 COMMAND *global_command = (COMMAND *)NULL;
108 /* Information about the current user. */
109 struct user_info current_user =
111 (uid_t)-1, (uid_t)-1, (gid_t)-1, (gid_t)-1,
112 (char *)NULL, (char *)NULL, (char *)NULL
115 /* The current host's name. */
116 char *current_host_name = (char *)NULL;
118 /* Non-zero means that this shell is a login shell.
121 1 = login shell from getty (or equivalent fake out)
122 -1 = login shell from "--login" (or -l) flag.
123 -2 = both from getty, and from flag.
127 /* Non-zero means that at this moment, the shell is interactive. In
128 general, this means that the shell is at this moment reading input
129 from the keyboard. */
132 /* Non-zero means that the shell was started as an interactive shell. */
133 int interactive_shell = 0;
135 /* Non-zero means to send a SIGHUP to all jobs when an interactive login
139 /* Tells what state the shell was in when it started:
140 0 = non-interactive shell script
143 3 = wordexp evaluation
144 This is a superset of the information provided by interactive_shell.
146 int startup_state = 0;
148 /* Special debugging helper. */
149 int debugging_login_shell = 0;
151 /* The environment that the shell passes to other commands. */
152 char **shell_environment;
154 /* Non-zero when we are executing a top-level command. */
157 /* The number of commands executed so far. */
158 int current_command_number = 1;
160 /* Non-zero is the recursion depth for commands. */
161 int indirection_level = 0;
163 /* The name of this shell, as taken from argv[0]. */
164 char *shell_name = (char *)NULL;
166 /* time in seconds when the shell was started */
167 time_t shell_start_time;
169 /* Are we running in an emacs shell window? */
170 int running_under_emacs;
172 /* The name of the .(shell)rc file. */
173 static char *bashrc_file = "~/.bashrc";
175 /* Non-zero means to act more like the Bourne shell on startup. */
176 static int act_like_sh;
178 /* Non-zero if this shell is being run by `su'. */
181 /* Non-zero if we have already expanded and sourced $ENV. */
182 static int sourced_env;
184 /* Is this shell running setuid? */
185 static int running_setuid;
187 /* Values for the long-winded argument names. */
188 static int debugging; /* Do debugging things. */
189 static int no_rc; /* Don't execute ~/.bashrc */
190 static int no_profile; /* Don't execute .profile */
191 static int do_version; /* Display interesting version info. */
192 static int make_login_shell; /* Make this shell be a `-bash' shell. */
193 static int want_initial_help; /* --help option */
195 int no_line_editing = 0; /* Don't do fancy line editing. */
196 int posixly_correct = 0; /* Non-zero means posix.2 superset. */
197 int dump_translatable_strings; /* Dump strings in $"...", don't execute. */
198 int dump_po_strings; /* Dump strings in $"..." in po format */
199 int wordexp_only = 0; /* Do word expansion only */
201 /* Some long-winded argument names. These are obviously new. */
210 { "debug", Int, &debugging, (char **)0x0 },
211 { "dump-po-strings", Int, &dump_po_strings, (char **)0x0 },
212 { "dump-strings", Int, &dump_translatable_strings, (char **)0x0 },
213 { "help", Int, &want_initial_help, (char **)0x0 },
214 { "init-file", Charp, (int *)0x0, &bashrc_file },
215 { "login", Int, &make_login_shell, (char **)0x0 },
216 { "noediting", Int, &no_line_editing, (char **)0x0 },
217 { "noprofile", Int, &no_profile, (char **)0x0 },
218 { "norc", Int, &no_rc, (char **)0x0 },
219 { "posix", Int, &posixly_correct, (char **)0x0 },
220 { "rcfile", Charp, (int *)0x0, &bashrc_file },
221 #if defined (RESTRICTED_SHELL)
222 { "restricted", Int, &restricted, (char **)0x0 },
224 { "verbose", Int, &echo_input_at_read, (char **)0x0 },
225 { "version", Int, &do_version, (char **)0x0 },
226 { "wordexp", Int, &wordexp_only, (char **)0x0 },
227 { (char *)0x0, Int, (int *)0x0, (char **)0x0 }
230 /* These are extern so execute_simple_command can set them, and then
231 longjmp back to main to execute a shell script, instead of calling
232 main () again and resulting in indefinite, possibly fatal, stack
234 procenv_t subshell_top_level;
236 char **subshell_argv;
237 char **subshell_envp;
239 #if defined (BUFFERED_INPUT)
240 /* The file descriptor from which the shell is reading input. */
241 int default_buffered_input = -1;
244 /* The following two variables are not static so they can show up in $-. */
245 int read_from_stdin; /* -s flag supplied */
246 int want_pending_command; /* -c flag supplied */
248 int malloc_trace_at_exit = 0;
250 static int shell_reinitialized = 0;
251 static char *local_pending_command;
253 static FILE *default_input;
255 static STRING_INT_ALIST *shopt_alist;
256 static int shopt_ind = 0, shopt_len = 0;
258 static int parse_long_options __P((char **, int, int));
259 static int parse_shell_options __P((char **, int, int));
260 static int bind_args __P((char **, int, int, int));
262 static void add_shopt_to_alist __P((char *, int));
263 static void run_shopt_alist __P((void));
265 static void execute_env_file __P((char *));
266 static void run_startup_files __P((void));
267 static int open_shell_script __P((char *));
268 static void set_bash_input __P((void));
269 static int run_one_command __P((char *));
270 static int run_wordexp __P((char *));
272 static int uidget __P((void));
274 static void init_interactive __P((void));
275 static void init_noninteractive __P((void));
277 static void set_shell_name __P((char *));
278 static void shell_initialize __P((void));
279 static void shell_reinitialize __P((void));
281 static void show_shell_usage __P((FILE *, int));
285 _cygwin32_check_tmp ()
289 if (stat ("/tmp", &sb) < 0)
290 internal_warning ("could not find /tmp, please create!");
293 if (S_ISDIR (sb.st_mode) == 0)
294 internal_warning ("/tmp must be a valid directory name");
297 #endif /* __CYGWIN__ */
299 #if defined (NO_MAIN_ENV_ARG)
300 /* systems without third argument to main() */
305 #else /* !NO_MAIN_ENV_ARG */
307 main (argc, argv, env)
310 #endif /* !NO_MAIN_ENV_ARG */
313 int code, old_errexit_flag;
314 #if defined (RESTRICTED_SHELL)
317 volatile int locally_skip_execution;
318 volatile int arg_index, top_level_arg_index;
323 #endif /* __OPENNT */
329 USE_VAR(old_errexit_flag);
330 #if defined (RESTRICTED_SHELL)
334 /* Catch early SIGINTs. */
335 code = setjmp (top_level);
339 #if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS)
341 malloc_set_register (1);
348 _cygwin32_check_tmp ();
349 #endif /* __CYGWIN__ */
351 /* Wait forever if we are debugging a login shell. */
352 while (debugging_login_shell);
354 set_default_locale ();
356 running_setuid = uidget ();
358 if (getenv ("POSIXLY_CORRECT") || getenv ("POSIX_PEDANTIC"))
361 #if defined (USE_GNU_MALLOC_LIBRARY)
362 mcheck (programming_error, (void (*) ())0);
363 #endif /* USE_GNU_MALLOC_LIBRARY */
365 if (setjmp (subshell_top_level))
367 argc = subshell_argc;
368 argv = subshell_argv;
373 shell_reinitialized = 0;
375 /* Initialize `local' variables for all `invocations' of main (). */
377 local_pending_command = (char *)NULL;
378 want_pending_command = locally_skip_execution = read_from_stdin = 0;
379 default_input = stdin;
380 #if defined (BUFFERED_INPUT)
381 default_buffered_input = -1;
384 /* Fix for the `infinite process creation' bug when running shell scripts
385 from startup files on System V. */
386 login_shell = make_login_shell = 0;
388 /* If this shell has already been run, then reinitialize it to a
390 if (shell_initialized || shell_name)
392 /* Make sure that we do not infinitely recurse as a login shell. */
393 if (*shell_name == '-')
396 shell_reinitialize ();
397 if (setjmp (top_level))
401 shell_environment = env;
402 set_shell_name (argv[0]);
403 shell_start_time = NOW; /* NOW now defined in general.h */
405 /* Parse argument flags from the input line. */
407 /* Find full word arguments first. */
408 arg_index = parse_long_options (argv, arg_index, argc);
410 if (want_initial_help)
412 show_shell_usage (stdout, 1);
413 exit (EXECUTION_SUCCESS);
418 show_shell_version (1);
419 exit (EXECUTION_SUCCESS);
422 /* All done with full word options; do standard shell option parsing.*/
423 this_command_name = shell_name; /* for error reporting */
424 arg_index = parse_shell_options (argv, arg_index, argc);
426 /* If user supplied the "--login" (or -l) flag, then set and invert
428 if (make_login_shell)
431 login_shell = -login_shell;
434 set_login_shell (login_shell != 0);
437 dump_translatable_strings = 1;
439 if (dump_translatable_strings)
440 read_but_dont_execute = 1;
442 if (running_setuid && privileged_mode == 0)
443 disable_priv_mode ();
445 /* Need to get the argument to a -c option processed in the
446 above loop. The next arg is a command to execute, and the
447 following args are $0...$n respectively. */
448 if (want_pending_command)
450 local_pending_command = argv[arg_index];
451 if (local_pending_command == 0)
453 report_error ("-c: option requires an argument");
458 this_command_name = (char *)NULL;
460 cmd_init(); /* initialize the command object caches */
462 /* First, let the outside world know about our interactive status.
463 A shell is interactive if the `-i' flag was given, or if all of
464 the following conditions are met:
466 no arguments remaining or the -s flag given
467 standard input is a terminal
468 standard output is a terminal
469 Refer to Posix.2, the description of the `sh' utility. */
471 if (forced_interactive || /* -i flag */
472 (!local_pending_command && /* No -c command and ... */
473 wordexp_only == 0 && /* No --wordexp and ... */
474 ((arg_index == argc) || /* no remaining args or... */
475 read_from_stdin) && /* -s flag with args, and */
476 isatty (fileno (stdin)) && /* Input is a terminal and */
477 isatty (fileno (stdout)))) /* output is a terminal. */
480 init_noninteractive ();
482 #define CLOSE_FDS_AT_LOGIN
483 #if defined (CLOSE_FDS_AT_LOGIN)
485 * Some systems have the bad habit of starting login shells with lots of open
486 * file descriptors. For instance, most systems that have picked up the
487 * pre-4.0 Sun YP code leave a file descriptor open each time you call one
488 * of the getpw* functions, and it's set to be open across execs. That
489 * means one for login, one for xterm, one for shelltool, etc.
491 if (login_shell && interactive_shell)
493 for (i = 3; i < 20; i++)
496 #endif /* CLOSE_FDS_AT_LOGIN */
498 /* If we're in a strict Posix.2 mode, turn on interactive comments,
499 alias expansion in non-interactive shells, and other Posix.2 things. */
502 bind_variable ("POSIXLY_CORRECT", "y");
503 sv_strict_posix ("POSIXLY_CORRECT");
506 /* Now we run the shopt_alist and process the options. */
510 /* From here on in, the shell must be a normal functioning shell.
511 Variables from the environment are expected to be set, etc. */
514 set_default_locale_vars ();
516 if (interactive_shell)
520 term = getenv ("TERM");
521 no_line_editing |= term && (STREQ (term, "emacs"));
522 term = getenv ("EMACS");
523 running_under_emacs = term ? ((strmatch ("*term*", term, 0) == 0) ? 2 : 1)
525 no_line_editing |= term && term[0] == 't' && term[1] == '\0';
528 top_level_arg_index = arg_index;
529 old_errexit_flag = exit_immediately_on_error;
531 /* Give this shell a place to longjmp to before executing the
532 startup files. This allows users to press C-c to abort the
534 code = setjmp (top_level);
537 if (code == EXITPROG)
538 exit_shell (last_command_exit_value);
541 #if defined (JOB_CONTROL)
542 /* Reset job control, since run_startup_files turned it off. */
543 set_job_control (interactive_shell);
545 /* Reset value of `set -e', since it's turned off before running
546 the startup files. */
547 exit_immediately_on_error += old_errexit_flag;
548 locally_skip_execution++;
552 arg_index = top_level_arg_index;
554 /* Execute the start-up scripts. */
556 if (interactive_shell == 0)
558 unbind_variable ("PS1");
559 unbind_variable ("PS2");
562 /* This has already been done by init_noninteractive */
563 expand_aliases = posixly_correct;
568 change_flag ('i', FLAG_ON);
572 #if defined (RESTRICTED_SHELL)
573 /* Set restricted_shell based on whether the basename of $0 indicates that
574 the shell should be restricted or if the `-r' option was supplied at
576 restricted_shell = shell_is_restricted (shell_name);
578 /* If the `-r' option is supplied at invocation, make sure that the shell
579 is not in restricted mode when running the startup files. */
580 saverst = restricted;
584 /* The startup files are run with `set -e' temporarily disabled. */
585 if (locally_skip_execution == 0 && running_setuid == 0)
587 old_errexit_flag = exit_immediately_on_error;
588 exit_immediately_on_error = 0;
590 run_startup_files ();
591 exit_immediately_on_error += old_errexit_flag;
594 /* If we are invoked as `sh', turn on Posix mode. */
597 bind_variable ("POSIXLY_CORRECT", "y");
598 sv_strict_posix ("POSIXLY_CORRECT");
601 #if defined (RESTRICTED_SHELL)
602 /* Turn on the restrictions after executing the startup files. This
603 means that `bash -r' or `set -r' invoked from a startup file will
604 turn on the restrictions after the startup files are executed. */
605 restricted = saverst || restricted;
606 if (shell_reinitialized == 0)
607 maybe_make_restricted (shell_name);
608 #endif /* RESTRICTED_SHELL */
613 last_command_exit_value = run_wordexp (argv[arg_index]);
614 exit_shell (last_command_exit_value);
617 if (local_pending_command)
619 arg_index = bind_args (argv, arg_index, argc, 0);
621 #if defined (ONESHOT)
623 run_one_command (local_pending_command);
624 exit_shell (last_command_exit_value);
626 with_input_from_string (local_pending_command, "-c");
627 goto read_and_execute;
628 #endif /* !ONESHOT */
631 /* Get possible input filename and set up default_buffered_input or
632 default_input as appropriate. */
633 if (arg_index != argc && read_from_stdin == 0)
635 open_shell_script (argv[arg_index]);
638 else if (interactive == 0)
639 /* In this mode, bash is reading a script from stdin, which is a
640 pipe or redirected file. */
641 #if defined (BUFFERED_INPUT)
642 default_buffered_input = fileno (stdin); /* == 0 */
644 setbuf (default_input, (char *)NULL);
645 #endif /* !BUFFERED_INPUT */
649 /* Bind remaining args to $1 ... $n */
650 arg_index = bind_args (argv, arg_index, argc, 1);
651 /* Do the things that should be done only for interactive shells. */
652 if (interactive_shell)
654 /* Set up for checking for presence of mail. */
655 remember_mail_dates ();
658 #if defined (HISTORY)
659 /* Initialize the interactive history stuff. */
660 bash_initialize_history ();
661 /* Don't load the history from the history file if we've already
662 saved some lines in this session (e.g., by putting `history -s xx'
663 into one of the startup files). */
664 if (shell_initialized == 0 && history_lines_this_session == 0)
668 /* Initialize terminal state for interactive shells after the
669 .bash_profile and .bashrc are interpreted. */
673 #if !defined (ONESHOT)
675 #endif /* !ONESHOT */
677 shell_initialized = 1;
679 /* Read commands until exit condition. */
681 exit_shell (last_command_exit_value);
685 parse_long_options (argv, arg_start, arg_end)
687 int arg_start, arg_end;
689 int arg_index, longarg, i;
692 arg_index = arg_start;
693 while ((arg_index != arg_end) && (arg_string = argv[arg_index]) &&
694 (*arg_string == '-'))
698 /* Make --login equivalent to -login. */
699 if (arg_string[1] == '-' && arg_string[2])
705 for (i = 0; long_args[i].name; i++)
707 if (STREQ (arg_string + 1, long_args[i].name))
709 if (long_args[i].type == Int)
710 *long_args[i].int_value = 1;
711 else if (argv[++arg_index] == 0)
713 report_error ("%s: option requires an argument", long_args[i].name);
717 *long_args[i].char_value = argv[arg_index];
722 if (long_args[i].name == 0)
726 report_error ("%s: invalid option", argv[arg_index]);
727 show_shell_usage (stderr, 0);
730 break; /* No such argument. Maybe flag arg. */
740 parse_shell_options (argv, arg_start, arg_end)
742 int arg_start, arg_end;
745 int arg_character, on_or_off, next_arg, i;
746 char *o_option, *arg_string;
748 arg_index = arg_start;
749 while (arg_index != arg_end && (arg_string = argv[arg_index]) &&
750 (*arg_string == '-' || *arg_string == '+'))
752 /* There are flag arguments, so parse them. */
753 next_arg = arg_index + 1;
755 /* A single `-' signals the end of options. From the 4.3 BSD sh.
756 An option `--' means the same thing; this is the standard
757 getopt(3) meaning. */
758 if (arg_string[0] == '-' &&
759 (arg_string[1] == '\0' ||
760 (arg_string[1] == '-' && arg_string[2] == '\0')))
764 on_or_off = arg_string[0];
765 while (arg_character = arg_string[i++])
767 switch (arg_character)
770 want_pending_command = 1;
774 make_login_shell = 1;
782 o_option = argv[next_arg];
785 list_minus_o_opts (-1, (on_or_off == '-') ? 0 : 1);
788 if (set_minus_o_option (on_or_off, o_option) != EXECUTION_SUCCESS)
794 /* Since some of these can be overridden by the normal
795 interactive/non-interactive shell initialization or
796 initializing posix mode, we save the options and process
797 them after initialization. */
798 o_option = argv[next_arg];
801 shopt_listopt (o_option, (on_or_off == '-') ? 0 : 1);
804 add_shopt_to_alist (o_option, on_or_off);
809 dump_translatable_strings = 1;
813 if (change_flag (arg_character, on_or_off) == FLAG_ERROR)
815 report_error ("%c%c: invalid option", on_or_off, arg_character);
816 show_shell_usage (stderr, 0);
821 /* Can't do just a simple increment anymore -- what about
822 "bash -abouo emacs ignoreeof -hP"? */
823 arg_index = next_arg;
829 /* Exit the shell with status S. */
834 /* Do trap[0] if defined. Allow it to override the exit status
836 if (signal_is_trapped (0))
837 s = run_exit_trap ();
839 #if defined (PROCESS_SUBSTITUTION)
841 #endif /* PROCESS_SUBSTITUTION */
843 #if defined (HISTORY)
844 if (interactive_shell)
845 maybe_save_shell_history ();
848 #if defined (JOB_CONTROL)
849 /* If the user has run `shopt -s huponexit', hangup all jobs when we exit
850 an interactive login shell. ksh does this unconditionally. */
851 if (interactive_shell && login_shell && hup_on_exit)
854 /* If this shell is interactive, terminate all stopped jobs and
855 restore the original terminal process group. Don't do this if we're
856 in a subshell and calling exit_shell after, for example, a failed
858 if (subshell_environment == 0)
860 #endif /* JOB_CONTROL */
862 /* Always return the exit status of the last command to our parent. */
866 /* A wrapper for exit that (optionally) can do other things, like malloc
867 statistics tracing. */
872 #if defined (MALLOC_DEBUG) && defined (USING_BASH_MALLOC)
873 if (malloc_trace_at_exit)
874 trace_malloc_stats (get_name_for_error (), (char *)NULL);
880 /* Source the bash startup files. If POSIXLY_CORRECT is non-zero, we obey
881 the Posix.2 startup file rules: $ENV is expanded, and if the file it
882 names exists, that file is sourced. The Posix.2 rules are in effect
883 for interactive shells only. (section 4.56.5.3) */
885 /* Execute ~/.bashrc for most shells. Never execute it if
886 ACT_LIKE_SH is set, or if NO_RC is set.
888 If the executable file "/usr/gnu/src/bash/foo" contains:
895 COMMAND EXECUTE BASHRC
896 --------------------------------
900 rsh machine ls YES (for rsh, which calls `bash -c')
901 rsh machine foo YES (for shell started by rsh) NO (for foo!)
908 execute_env_file (env_file)
913 if (env_file && *env_file)
915 fn = expand_string_unsplit_to_string (env_file, Q_DOUBLE_QUOTES);
917 maybe_execute_file (fn, 1);
925 #if defined (JOB_CONTROL)
928 int sourced_login, run_by_ssh;
930 /* get the rshd/sshd case out of the way first. */
931 if (interactive_shell == 0 && no_rc == 0 && login_shell == 0 &&
932 act_like_sh == 0 && local_pending_command)
934 #ifdef SSH_SOURCE_BASHRC
935 run_by_ssh = (find_variable ("SSH_CLIENT") != (SHELL_VAR *)0) ||
936 (find_variable ("SSH2_CLIENT") != (SHELL_VAR *)0);
941 /* If we were run by sshd or we think we were run by rshd, execute
942 ~/.bashrc if we are a top-level shell. */
943 if ((run_by_ssh || isnetconn (fileno (stdin))) && shell_level < 2)
946 # if defined (__OPENNT)
947 maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
949 maybe_execute_file (SYS_BASHRC, 1);
952 maybe_execute_file (bashrc_file, 1);
957 #if defined (JOB_CONTROL)
958 /* Startup files should be run without job control enabled. */
959 old_job_control = interactive_shell ? set_job_control (0) : 0;
964 /* A shell begun with the --login (or -l) flag that is not in posix mode
965 runs the login shell startup files, no matter whether or not it is
966 interactive. If NON_INTERACTIVE_LOGIN_SHELLS is defined, run the
967 startup files if argv[0][0] == '-' as well. */
968 #if defined (NON_INTERACTIVE_LOGIN_SHELLS)
969 if (login_shell && posixly_correct == 0)
971 if (login_shell < 0 && posixly_correct == 0)
974 /* We don't execute .bashrc for login shells. */
977 /* Execute /etc/profile and one of the personal login shell
978 initialization files. */
981 maybe_execute_file (SYS_PROFILE, 1);
983 if (act_like_sh) /* sh */
984 maybe_execute_file ("~/.profile", 1);
985 else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) &&
986 (maybe_execute_file ("~/.bash_login", 1) == 0)) /* bash */
987 maybe_execute_file ("~/.profile", 1);
993 /* A non-interactive shell not named `sh' and not in posix mode reads and
994 executes commands from $BASH_ENV. If `su' starts a shell with `-c cmd'
995 and `-su' as the name of the shell, we want to read the startup files.
996 No other non-interactive shells read any startup files. */
997 if (interactive_shell == 0 && !(su_shell && login_shell))
999 if (posixly_correct == 0 && act_like_sh == 0 && privileged_mode == 0 &&
1001 execute_env_file (get_string_value ("BASH_ENV"));
1005 /* Interactive shell or `-su' shell. */
1006 if (posixly_correct == 0) /* bash, sh */
1008 if (login_shell && sourced_login++ == 0)
1010 /* We don't execute .bashrc for login shells. */
1013 /* Execute /etc/profile and one of the personal login shell
1014 initialization files. */
1015 if (no_profile == 0)
1017 maybe_execute_file (SYS_PROFILE, 1);
1019 if (act_like_sh) /* sh */
1020 maybe_execute_file ("~/.profile", 1);
1021 else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) &&
1022 (maybe_execute_file ("~/.bash_login", 1) == 0)) /* bash */
1023 maybe_execute_file ("~/.profile", 1);
1028 if (act_like_sh == 0 && no_rc == 0)
1031 # if defined (__OPENNT)
1032 maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
1034 maybe_execute_file (SYS_BASHRC, 1);
1037 maybe_execute_file (bashrc_file, 1);
1040 else if (act_like_sh && privileged_mode == 0 && sourced_env++ == 0)
1041 execute_env_file (get_string_value ("ENV"));
1043 else /* bash --posix, sh --posix */
1046 if (interactive_shell && privileged_mode == 0 && sourced_env++ == 0)
1047 execute_env_file (get_string_value ("ENV"));
1050 #if defined (JOB_CONTROL)
1051 set_job_control (old_job_control);
1055 #if defined (RESTRICTED_SHELL)
1056 /* Return 1 if the shell should be a restricted one based on NAME or the
1057 value of `restricted'. Don't actually do anything, just return a
1060 shell_is_restricted (name)
1067 temp = base_pathname (name);
1068 return (STREQ (temp, RESTRICTED_SHELL_NAME));
1071 /* Perhaps make this shell a `restricted' one, based on NAME. If the
1072 basename of NAME is "rbash", then this shell is restricted. The
1073 name of the restricted shell is a configurable option, see config.h.
1074 In a restricted shell, PATH, SHELL, ENV, and BASH_ENV are read-only
1076 Do this also if `restricted' is already set to 1; maybe the shell was
1079 maybe_make_restricted (name)
1084 temp = base_pathname (name);
1085 if (restricted || (STREQ (temp, RESTRICTED_SHELL_NAME)))
1087 set_var_read_only ("PATH");
1088 set_var_read_only ("SHELL");
1089 set_var_read_only ("ENV");
1090 set_var_read_only ("BASH_ENV");
1093 return (restricted);
1095 #endif /* RESTRICTED_SHELL */
1097 /* Fetch the current set of uids and gids and return 1 if we're running
1098 setuid or setgid. */
1105 if (current_user.uid != u)
1107 FREE (current_user.user_name);
1108 FREE (current_user.shell);
1109 FREE (current_user.home_dir);
1110 current_user.user_name = current_user.shell = current_user.home_dir = (char *)NULL;
1112 current_user.uid = u;
1113 current_user.gid = getgid ();
1114 current_user.euid = geteuid ();
1115 current_user.egid = getegid ();
1117 /* See whether or not we are running setuid or setgid. */
1118 return (current_user.uid != current_user.euid) ||
1119 (current_user.gid != current_user.egid);
1123 disable_priv_mode ()
1125 setuid (current_user.uid);
1126 setgid (current_user.gid);
1127 current_user.euid = current_user.uid;
1128 current_user.egid = current_user.gid;
1136 WORD_LIST *wl, *result;
1138 code = setjmp (top_level);
1140 if (code != NOT_JUMPED)
1144 /* Some kind of throw to top_level has occured. */
1146 return last_command_exit_value = 127;
1148 return last_command_exit_value;
1150 return last_command_exit_value = 1;
1152 command_error ("run_wordexp", CMDERR_BADJUMP, code, 0);
1156 /* Run it through the parser to get a list of words and expand them */
1157 if (words && *words)
1159 with_input_from_string (words, "--wordexp");
1160 if (parse_command () != 0)
1162 if (global_command == 0)
1167 if (global_command->type != cm_simple)
1169 wl = global_command->value.Simple->words;
1170 result = wl ? expand_words_no_vars (wl) : (WORD_LIST *)0;
1173 result = (WORD_LIST *)0;
1175 last_command_exit_value = 0;
1183 /* Count up the number of words and bytes, and print them. Don't count
1184 the trailing NUL byte. */
1185 for (nw = nb = 0, wl = result; wl; wl = wl->next)
1188 nb += strlen (wl->word->word);
1190 printf ("%u\n%u\n", nw, nb);
1191 /* Print each word on a separate line. This will have to be changed when
1192 the interface to glibc is completed. */
1193 for (wl = result; wl; wl = wl->next)
1194 printf ("%s\n", wl->word->word);
1199 #if defined (ONESHOT)
1200 /* Run one command, given as the argument to the -c option. Tell
1201 parse_and_execute not to fork for a simple command. */
1203 run_one_command (command)
1208 code = setjmp (top_level);
1210 if (code != NOT_JUMPED)
1212 #if defined (PROCESS_SUBSTITUTION)
1213 unlink_fifo_list ();
1214 #endif /* PROCESS_SUBSTITUTION */
1217 /* Some kind of throw to top_level has occured. */
1219 return last_command_exit_value = 127;
1221 return last_command_exit_value;
1223 return last_command_exit_value = 1;
1225 command_error ("run_one_command", CMDERR_BADJUMP, code, 0);
1228 return (parse_and_execute (savestring (command), "-c", SEVAL_NOHIST));
1230 #endif /* ONESHOT */
1233 bind_args (argv, arg_start, arg_end, start_index)
1235 int arg_start, arg_end, start_index;
1240 for (i = arg_start, args = (WORD_LIST *)NULL; i != arg_end; i++)
1241 args = make_word_list (make_word (argv[i]), args);
1244 args = REVERSE_LIST (args, WORD_LIST *);
1245 if (start_index == 0) /* bind to $0...$n for sh -c command */
1247 /* Posix.2 4.56.3 says that the first argument after sh -c command
1248 becomes $0, and the rest of the arguments become $1...$n */
1249 shell_name = savestring (args->word->word);
1250 FREE (dollar_vars[0]);
1251 dollar_vars[0] = savestring (args->word->word);
1252 remember_args (args->next, 1);
1254 else /* bind to $1...$n for shell script */
1255 remember_args (args, 1);
1257 dispose_words (args);
1266 remember_args ((WORD_LIST *)NULL, 1);
1270 open_shell_script (script_name)
1273 int fd, e, fd_is_tty;
1274 char *filename, *path_filename;
1279 free (dollar_vars[0]);
1280 dollar_vars[0] = savestring (script_name);
1281 filename = savestring (script_name);
1283 fd = open (filename, O_RDONLY);
1284 if ((fd < 0) && (errno == ENOENT) && (absolute_program (filename) == 0))
1287 /* If it's not in the current directory, try looking through PATH
1289 path_filename = find_path_file (script_name);
1293 filename = path_filename;
1294 fd = open (filename, O_RDONLY);
1303 file_error (filename);
1304 exit ((e == ENOENT) ? EX_NOTFOUND : EX_NOINPUT);
1308 fd_is_tty = isatty (fd);
1313 /* Only do this with non-tty file descriptors we can seek on. */
1314 if (fd_is_tty == 0 && (lseek (fd, 0L, 1) != -1))
1316 /* Check to see if the `file' in `bash file' is a binary file
1317 according to the same tests done by execute_simple_command (),
1318 and report an error and exit if it is. */
1319 sample_len = read (fd, sample, sizeof (sample));
1323 if ((fstat (fd, &sb) == 0) && S_ISDIR (sb.st_mode))
1324 internal_error ("%s: is a directory", filename);
1328 file_error (filename);
1332 else if (sample_len > 0 && (check_binary_file (sample, sample_len)))
1334 internal_error ("%s: cannot execute binary file", filename);
1335 exit (EX_BINARY_FILE);
1337 /* Now rewind the file back to the beginning. */
1341 /* Open the script. But try to move the file descriptor to a randomly
1342 large one, in the hopes that any descriptors used by the script will
1343 not match with ours. */
1344 fd = move_to_high_fd (fd, 0, -1);
1346 #if defined (__CYGWIN__) && defined (O_TEXT)
1347 setmode (fd, O_TEXT);
1350 #if defined (BUFFERED_INPUT)
1351 default_buffered_input = fd;
1352 SET_CLOSE_ON_EXEC (default_buffered_input);
1353 #else /* !BUFFERED_INPUT */
1354 default_input = fdopen (fd, "r");
1356 if (default_input == 0)
1358 file_error (filename);
1362 SET_CLOSE_ON_EXEC (fd);
1363 if (fileno (default_input) != fd)
1364 SET_CLOSE_ON_EXEC (fileno (default_input));
1365 #endif /* !BUFFERED_INPUT */
1367 /* Just about the only way for this code to be executed is if something
1368 like `bash -i /dev/stdin' is executed. */
1369 if (interactive_shell && fd_is_tty)
1374 #if defined (BUFFERED_INPUT)
1375 default_buffered_input = 0;
1377 fclose (default_input);
1378 default_input = stdin;
1381 else if (forced_interactive && fd_is_tty == 0)
1382 /* But if a script is called with something like `bash -i scriptname',
1383 we need to do a non-interactive setup here, since we didn't do it
1385 init_noninteractive ();
1391 /* Initialize the input routines for the parser. */
1395 /* Make sure the fd from which we are reading input is not in
1397 #if defined (BUFFERED_INPUT)
1398 if (interactive == 0)
1399 sh_unset_nodelay_mode (default_buffered_input);
1401 #endif /* !BUFFERED_INPUT */
1402 sh_unset_nodelay_mode (fileno (stdin));
1404 /* with_input_from_stdin really means `with_input_from_readline' */
1405 if (interactive && no_line_editing == 0)
1406 with_input_from_stdin ();
1408 #if defined (BUFFERED_INPUT)
1410 if (interactive == 0)
1411 with_input_from_buffered_stream (default_buffered_input, dollar_vars[0]);
1413 with_input_from_stream (default_input, dollar_vars[0]);
1415 #else /* !BUFFERED_INPUT */
1416 with_input_from_stream (default_input, dollar_vars[0]);
1417 #endif /* !BUFFERED_INPUT */
1420 /* Close the current shell script input source and forget about it. This is
1421 extern so execute_cmd.c:initialize_subshell() can call it. If CHECK_ZERO
1422 is non-zero, we close default_buffered_input even if it's the standard
1425 unset_bash_input (check_zero)
1428 #if defined (BUFFERED_INPUT)
1429 if ((check_zero && default_buffered_input >= 0) ||
1430 (check_zero == 0 && default_buffered_input > 0))
1432 close_buffered_fd (default_buffered_input);
1433 default_buffered_input = bash_input.location.buffered_fd = -1;
1435 #else /* !BUFFERED_INPUT */
1438 fclose (default_input);
1439 default_input = (FILE *)NULL;
1441 #endif /* !BUFFERED_INPUT */
1445 #if !defined (PROGRAM)
1446 # define PROGRAM "bash"
1450 set_shell_name (argv0)
1453 /* Here's a hack. If the name of this shell is "sh", then don't do
1454 any startup files; just try to be more like /bin/sh. */
1455 shell_name = base_pathname (argv0);
1457 if (*shell_name == '-')
1463 if (shell_name[0] == 's' && shell_name[1] == 'h' && shell_name[2] == '\0')
1465 if (shell_name[0] == 's' && shell_name[1] == 'u' && shell_name[2] == '\0')
1469 FREE (dollar_vars[0]);
1470 dollar_vars[0] = savestring (shell_name);
1472 /* A program may start an interactive shell with
1473 "execl ("/bin/bash", "-", NULL)".
1474 If so, default the name of this shell to our name. */
1475 if (!shell_name || !*shell_name || (shell_name[0] == '-' && !shell_name[1]))
1476 shell_name = PROGRAM;
1482 interactive_shell = startup_state = interactive = 1;
1487 init_noninteractive ()
1489 #if defined (HISTORY)
1490 bash_history_reinit (0);
1491 #endif /* HISTORY */
1492 interactive_shell = startup_state = interactive = 0;
1493 expand_aliases = posixly_correct; /* XXX - was 0 not posixly_correct */
1494 no_line_editing = 1;
1495 #if defined (JOB_CONTROL)
1496 set_job_control (0);
1497 #endif /* JOB_CONTROL */
1501 get_current_user_info ()
1503 struct passwd *entry;
1505 /* Don't fetch this more than once. */
1506 if (current_user.user_name == 0)
1508 entry = getpwuid (current_user.uid);
1511 current_user.user_name = savestring (entry->pw_name);
1512 current_user.shell = (entry->pw_shell && entry->pw_shell[0])
1513 ? savestring (entry->pw_shell)
1514 : savestring ("/bin/sh");
1515 current_user.home_dir = savestring (entry->pw_dir);
1519 current_user.user_name = savestring ("I have no name!");
1520 current_user.shell = savestring ("/bin/sh");
1521 current_user.home_dir = savestring ("/");
1527 /* Do whatever is necessary to initialize the shell.
1528 Put new initializations in here. */
1534 /* Line buffer output for stderr and stdout. */
1535 if (shell_initialized == 0)
1537 sh_setlinebuf (stderr);
1538 sh_setlinebuf (stdout);
1541 /* Sort the array of shell builtins so that the binary search in
1542 find_shell_builtin () works correctly. */
1543 initialize_shell_builtins ();
1545 /* Initialize the trap signal handlers before installing our own
1546 signal handlers. traps.c:restore_original_signals () is responsible
1547 for restoring the original default signal handlers. That function
1548 is called when we make a new child. */
1549 initialize_traps ();
1550 initialize_signals (0);
1552 /* It's highly unlikely that this will change. */
1553 if (current_host_name == 0)
1555 /* Initialize current_host_name. */
1556 if (gethostname (hostname, 255) < 0)
1557 current_host_name = "??host??";
1559 current_host_name = savestring (hostname);
1562 /* Initialize the stuff in current_user that comes from the password
1563 file. We don't need to do this right away if the shell is not
1565 if (interactive_shell)
1566 get_current_user_info ();
1568 /* Initialize our interface to the tilde expander. */
1569 tilde_initialize ();
1571 /* Initialize internal and environment variables. Don't import shell
1572 functions from the environment if we are running in privileged or
1573 restricted mode or if the shell is running setuid. */
1574 #if defined (RESTRICTED_SHELL)
1575 initialize_shell_variables (shell_environment, privileged_mode||restricted||running_setuid);
1577 initialize_shell_variables (shell_environment, privileged_mode||running_setuid);
1580 /* Initialize the data structures for storing and running jobs. */
1581 initialize_job_control (0);
1583 /* Initialize input streams to null. */
1584 initialize_bash_input ();
1586 initialize_flags ();
1588 /* Initialize the shell options. Don't import the shell options
1589 from the environment variable $SHELLOPTS if we are running in
1590 privileged or restricted mode or if the shell is running setuid. */
1591 #if defined (RESTRICTED_SHELL)
1592 initialize_shell_options (privileged_mode||restricted||running_setuid);
1594 initialize_shell_options (privileged_mode||running_setuid);
1598 /* Function called by main () when it appears that the shell has already
1599 had some initialization performed. This is supposed to reset the world
1600 back to a pristine state, as if we had been exec'ed. */
1602 shell_reinitialize ()
1604 /* The default shell prompts. */
1605 primary_prompt = PPROMPT;
1606 secondary_prompt = SPROMPT;
1608 /* Things that get 1. */
1609 current_command_number = 1;
1611 /* We have decided that the ~/.bashrc file should not be executed
1612 for the invocation of each shell script. If the variable $ENV
1613 (or $BASH_ENV) is set, its value is used as the name of a file
1615 no_rc = no_profile = 1;
1617 /* Things that get 0. */
1618 login_shell = make_login_shell = interactive = executing = 0;
1619 debugging = do_version = line_number = last_command_exit_value = 0;
1620 forced_interactive = interactive_shell = subshell_environment = 0;
1623 #if defined (HISTORY)
1624 bash_history_reinit (0);
1625 #endif /* HISTORY */
1627 #if defined (RESTRICTED_SHELL)
1629 #endif /* RESTRICTED_SHELL */
1631 /* Ensure that the default startup file is used. (Except that we don't
1632 execute this file for reinitialized shells). */
1633 bashrc_file = "~/.bashrc";
1635 /* Delete all variables and functions. They will be reinitialized when
1636 the environment is parsed. */
1637 delete_all_contexts (shell_variables);
1638 delete_all_variables (shell_functions);
1640 shell_reinitialized = 1;
1644 show_shell_usage (fp, extra)
1649 char *set_opts, *s, *t;
1652 fprintf (fp, "GNU bash, version %s-(%s)\n", shell_version_string (), MACHTYPE);
1653 fprintf (fp, "Usage:\t%s [GNU long option] [option] ...\n\t%s [GNU long option] [option] script-file ...\n",
1654 shell_name, shell_name);
1655 fputs ("GNU long options:\n", fp);
1656 for (i = 0; long_args[i].name; i++)
1657 fprintf (fp, "\t--%s\n", long_args[i].name);
1659 fputs ("Shell options:\n", fp);
1660 fputs ("\t-irsD or -c command or -O shopt_option\t\t(invocation only)\n", fp);
1662 for (i = 0, set_opts = 0; shell_builtins[i].name; i++)
1663 if (STREQ (shell_builtins[i].name, "set"))
1664 set_opts = savestring (shell_builtins[i].short_doc);
1667 s = xstrchr (set_opts, '[');
1672 t = xstrchr (s, ']');
1675 fprintf (fp, "\t-%s or -o option\n", s);
1681 fprintf (fp, "Type `%s -c \"help set\"' for more information about shell options.\n", shell_name);
1682 fprintf (fp, "Type `%s -c help' for more information about shell builtin commands.\n", shell_name);
1683 fprintf (fp, "Use the `bashbug' command to report bugs.\n");
1688 add_shopt_to_alist (opt, on_or_off)
1692 if (shopt_ind >= shopt_len)
1695 shopt_alist = (STRING_INT_ALIST *)xrealloc (shopt_alist, shopt_len * sizeof (shopt_alist[0]));
1697 shopt_alist[shopt_ind].word = opt;
1698 shopt_alist[shopt_ind].token = on_or_off;
1707 for (i = 0; i < shopt_ind; i++)
1708 if (shopt_setopt (shopt_alist[i].word, (shopt_alist[i].token == '-')) != EXECUTION_SUCCESS)
1712 shopt_ind = shopt_len = 0;