1 /* Copyright (C) 1996 Free Software Foundation, Inc.
3 This file is part of GNU Bash, the Bourne Again SHell.
5 Bash is free software; you can redistribute it and/or modify it under
6 the terms of the GNU General Public License as published by the Free
7 Software Foundation; either version 2, or (at your option) any later
10 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 You should have received a copy of the GNU General Public License along
16 with Bash; see the file COPYING. If not, write to the Free Software
17 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
21 #if defined (HAVE_UNISTD_H)
23 # include <sys/types.h>
34 #include "../bashansi.h"
38 #include "../builtins.h"
41 #include "../execute_cmd.h"
45 # include "../bashhist.h"
54 #define IS_BUILTIN(s) (builtin_address_internal(s, 0) != (struct builtin *)NULL)
56 extern void run_trap_cleanup ();
59 extern int interactive, interactive_shell;
60 extern int indirection_level, startup_state, subshell_environment;
61 extern int line_number;
62 extern int last_command_exit_value;
63 extern int running_trap;
64 extern int posixly_correct;
65 extern COMMAND *global_command;
67 int parse_and_execute_level = 0;
69 static int cat_file ();
71 /* How to force parse_and_execute () to clean up after itself. */
73 parse_and_execute_cleanup ()
77 run_trap_cleanup (running_trap - 1);
78 unfreeze_jobs_list ();
80 run_unwind_frame ("parse_and_execute_top");
83 /* Parse and execute the commands in STRING. Returns whatever
84 execute_command () returns. This frees STRING. FLAGS is a
85 flags word; look in common.h for the possible values. Actions
87 (flags & SEVAL_NONINT) -> interactive = 0;
88 (flags & SEVAL_INTERACT) -> interactive = 1;
89 (flags & SEVAL_NOHIST) -> call bash_history_disable ()
93 parse_and_execute (string, from_file, flags)
99 volatile int should_jump_to_top_level, last_result;
101 COMMAND *volatile command;
103 orig_string = string;
104 /* Unwind protect this invocation of parse_and_execute (). */
105 begin_unwind_frame ("parse_and_execute_top");
106 unwind_protect_int (parse_and_execute_level);
107 unwind_protect_jmp_buf (top_level);
108 unwind_protect_int (indirection_level);
109 unwind_protect_int (line_number);
110 if (flags & (SEVAL_NONINT|SEVAL_INTERACT))
111 unwind_protect_int (interactive);
113 #if defined (HISTORY)
114 unwind_protect_int (remember_on_history); /* can be used in scripts */
115 # if defined (BANG_HISTORY)
116 if (interactive_shell)
118 unwind_protect_int (history_expansion_inhibited);
120 # endif /* BANG_HISTORY */
123 if (interactive_shell)
125 x = get_current_prompt_level ();
126 add_unwind_protect (set_current_prompt_level, x);
129 add_unwind_protect (pop_stream, (char *)NULL);
131 add_unwind_protect (xfree, orig_string);
134 parse_and_execute_level++;
135 push_stream (1); /* reset the line number */
137 if (flags & (SEVAL_NONINT|SEVAL_INTERACT))
138 interactive = (flags & SEVAL_NONINT) ? 0 : 1;
140 #if defined (HISTORY)
141 if (flags & SEVAL_NOHIST)
142 bash_history_disable ();
145 code = should_jump_to_top_level = 0;
146 last_result = EXECUTION_SUCCESS;
147 command = (COMMAND *)NULL;
149 with_input_from_string (string, from_file);
150 while (*(bash_input.location.string))
154 last_result = EXECUTION_FAILURE;
158 /* Provide a location for functions which `longjmp (top_level)' to
159 jump to. This prevents errors in substitution from restarting
160 the reader loop directly, for example. */
161 code = setjmp (top_level);
165 should_jump_to_top_level = 0;
170 run_unwind_frame ("pe_dispose");
171 /* Remember to call longjmp (top_level) after the old
172 value for it is restored. */
173 should_jump_to_top_level = 1;
177 run_unwind_frame ("pe_dispose");
178 last_result = last_command_exit_value = EXECUTION_FAILURE; /* XXX */
179 if (subshell_environment)
181 should_jump_to_top_level = 1;
187 dispose_command (command); /* pe_dispose does this */
193 command_error ("parse_and_execute", CMDERR_BADJUMP, code, 0);
198 if (parse_command () == 0)
200 if (interactive_shell == 0 && read_but_dont_execute)
202 last_result = EXECUTION_SUCCESS;
203 dispose_command (global_command);
204 global_command = (COMMAND *)NULL;
206 else if (command = global_command)
208 struct fd_bitmap *bitmap;
210 bitmap = new_fd_bitmap (FD_BITMAP_SIZE);
211 begin_unwind_frame ("pe_dispose");
212 add_unwind_protect (dispose_fd_bitmap, bitmap);
213 add_unwind_protect (dispose_command, command); /* XXX */
215 global_command = (COMMAND *)NULL;
217 #if defined (ONESHOT)
220 * we were invoked as `bash -c' (startup_state == 2) AND
221 * parse_and_execute has not been called recursively AND
222 * we have parsed the full command (string == '\0') AND
223 * we have a simple command without redirections AND
224 * the command is not being timed
226 * tell the execution code that we don't need to fork
228 if (startup_state == 2 && parse_and_execute_level == 1 &&
229 *bash_input.location.string == '\0' &&
230 command->type == cm_simple &&
231 !command->redirects && !command->value.Simple->redirects &&
232 ((command->flags & CMD_TIME_PIPELINE) == 0))
234 command->flags |= CMD_NO_FORK;
235 command->value.Simple->flags |= CMD_NO_FORK;
239 /* See if this is a candidate for $( <file ). */
240 if (startup_state == 2 &&
241 (subshell_environment & SUBSHELL_COMSUB) &&
242 *bash_input.location.string == '\0' &&
243 command->type == cm_simple && !command->redirects &&
244 (command->flags & CMD_TIME_PIPELINE) == 0 &&
245 command->value.Simple->words == 0 &&
246 command->value.Simple->redirects &&
247 command->value.Simple->redirects->next == 0 &&
248 command->value.Simple->redirects->instruction == r_input_direction)
251 r = cat_file (command->value.Simple->redirects);
252 last_result = (r < 0) ? EXECUTION_FAILURE : EXECUTION_SUCCESS;
255 last_result = execute_command_internal
256 (command, 0, NO_PIPE, NO_PIPE, bitmap);
258 dispose_command (command);
259 dispose_fd_bitmap (bitmap);
260 discard_unwind_frame ("pe_dispose");
265 last_result = EXECUTION_FAILURE;
267 /* Since we are shell compatible, syntax errors in a script
268 abort the execution of the script. Right? */
275 run_unwind_frame ("parse_and_execute_top");
277 if (interrupt_state && parse_and_execute_level == 0)
279 /* An interrupt during non-interactive execution in an
280 interactive shell (e.g. via $PROMPT_COMMAND) should
281 not cause the shell to exit. */
282 interactive = interactive_shell;
283 throw_to_top_level ();
286 if (should_jump_to_top_level)
287 jump_to_top_level (code);
289 return (last_result);
292 /* Handle a $( < file ) command substitution. This expands the filename,
293 returning errors as appropriate, then just cats the file to the standard
302 if (r->instruction != r_input_direction)
305 /* Get the filename. */
306 if (posixly_correct && !interactive_shell)
307 disallow_filename_globbing++;
308 fn = redirection_expand (r->redirectee.filename);
309 if (posixly_correct && !interactive_shell)
310 disallow_filename_globbing--;
314 redirection_error (r, AMBIGUOUS_REDIRECT);
318 fd = open(fn, O_RDONLY);
329 nr = zread (fd, lbuf, sizeof(lbuf));
337 if (zwrite (1, lbuf, nr) < 0)