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Commit | Line | Data |
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cce855bc JA |
1 | /* redir.c -- Functions to perform input and output redirection. */ |
2 | ||
8943768b | 3 | /* Copyright (C) 1997-2008 Free Software Foundation, Inc. |
cce855bc JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
2e4498b3 CR |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
cce855bc | 11 | |
2e4498b3 CR |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
cce855bc JA |
16 | |
17 | You should have received a copy of the GNU General Public License | |
2e4498b3 CR |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
19 | */ | |
20 | ||
cce855bc JA |
21 | #include "config.h" |
22 | ||
23 | #if !defined (__GNUC__) && !defined (HAVE_ALLOCA_H) && defined (_AIX) | |
24 | #pragma alloca | |
25 | #endif /* _AIX && RISC6000 && !__GNUC__ */ | |
26 | ||
27 | #include <stdio.h> | |
28 | #include "bashtypes.h" | |
d3a24ed2 | 29 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
30 | # include <sys/file.h> |
31 | #endif | |
32 | #include "filecntl.h" | |
33 | #include "posixstat.h" | |
34 | ||
35 | #if defined (HAVE_UNISTD_H) | |
36 | # include <unistd.h> | |
37 | #endif | |
38 | ||
39 | #include <errno.h> | |
40 | ||
41 | #if !defined (errno) | |
42 | extern int errno; | |
43 | #endif | |
44 | ||
45 | #include "bashansi.h" | |
5e13499c | 46 | #include "bashintl.h" |
cce855bc | 47 | #include "memalloc.h" |
53ac45a3 CR |
48 | |
49 | #define NEED_FPURGE_DECL | |
50 | ||
cce855bc JA |
51 | #include "shell.h" |
52 | #include "flags.h" | |
53 | #include "execute_cmd.h" | |
54 | #include "redir.h" | |
55 | ||
56 | #if defined (BUFFERED_INPUT) | |
57 | # include "input.h" | |
58 | #endif | |
59 | ||
b0c16657 CR |
60 | #define SHELL_FD_BASE 10 |
61 | ||
d3a24ed2 CR |
62 | int expanding_redir; |
63 | ||
cce855bc | 64 | extern int posixly_correct; |
cce855bc JA |
65 | extern REDIRECT *redirection_undo_list; |
66 | extern REDIRECT *exec_redirection_undo_list; | |
67 | ||
68 | /* Static functions defined and used in this file. */ | |
f73dda09 JA |
69 | static void add_undo_close_redirect __P((int)); |
70 | static void add_exec_redirect __P((REDIRECT *)); | |
d3ad40de | 71 | static int add_undo_redirect __P((int, enum r_instruction)); |
f73dda09 JA |
72 | static int expandable_redirection_filename __P((REDIRECT *)); |
73 | static int stdin_redirection __P((enum r_instruction, int)); | |
d3a24ed2 | 74 | static int do_redirection_internal __P((REDIRECT *, int)); |
f73dda09 JA |
75 | |
76 | static int write_here_document __P((int, WORD_DESC *)); | |
7117c2d2 JA |
77 | static int write_here_string __P((int, WORD_DESC *)); |
78 | static int here_document_to_fd __P((WORD_DESC *, enum r_instruction)); | |
f73dda09 JA |
79 | |
80 | static int redir_special_open __P((int, char *, int, int, enum r_instruction)); | |
81 | static int noclobber_open __P((char *, int, int, enum r_instruction)); | |
82 | static int redir_open __P((char *, int, int, enum r_instruction)); | |
cce855bc | 83 | |
7117c2d2 JA |
84 | /* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to |
85 | a new redirection and when creating the redirection undo list. */ | |
cce855bc JA |
86 | static REDIRECTEE rd; |
87 | ||
88 | /* Set to errno when a here document cannot be created for some reason. | |
89 | Used to print a reasonable error message. */ | |
90 | static int heredoc_errno; | |
91 | ||
92 | void | |
93 | redirection_error (temp, error) | |
94 | REDIRECT *temp; | |
95 | int error; | |
96 | { | |
f73dda09 | 97 | char *filename, *allocname; |
bb70624e | 98 | int oflags; |
cce855bc | 99 | |
f73dda09 JA |
100 | allocname = 0; |
101 | if (temp->redirector < 0) | |
102 | /* This can happen when read_token_word encounters overflow, like in | |
103 | exec 4294967297>x */ | |
5e13499c | 104 | filename = _("file descriptor out of range"); |
f73dda09 JA |
105 | #ifdef EBADF |
106 | else if (temp->redirector >= 0 && errno == EBADF) | |
7117c2d2 JA |
107 | { |
108 | /* If we're dealing with two file descriptors, we have to guess about | |
109 | which one is invalid; in the cases of r_{duplicating,move}_input and | |
110 | r_{duplicating,move}_output we're here because dup2() failed. */ | |
111 | switch (temp->instruction) | |
112 | { | |
113 | case r_duplicating_input: | |
114 | case r_duplicating_output: | |
115 | case r_move_input: | |
116 | case r_move_output: | |
117 | filename = allocname = itos (temp->redirectee.dest); | |
118 | break; | |
119 | default: | |
120 | filename = allocname = itos (temp->redirector); | |
121 | break; | |
122 | } | |
123 | } | |
f73dda09 JA |
124 | #endif |
125 | else if (expandable_redirection_filename (temp)) | |
cce855bc | 126 | { |
bb70624e JA |
127 | if (posixly_correct && interactive_shell == 0) |
128 | { | |
129 | oflags = temp->redirectee.filename->flags; | |
130 | temp->redirectee.filename->flags |= W_NOGLOB; | |
131 | } | |
f73dda09 | 132 | filename = allocname = redirection_expand (temp->redirectee.filename); |
bb70624e | 133 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 | 134 | temp->redirectee.filename->flags = oflags; |
cce855bc | 135 | if (filename == 0) |
f73dda09 | 136 | filename = temp->redirectee.filename->word; |
cce855bc | 137 | } |
f73dda09 JA |
138 | else if (temp->redirectee.dest < 0) |
139 | filename = "file descriptor out of range"; | |
cce855bc | 140 | else |
f73dda09 | 141 | filename = allocname = itos (temp->redirectee.dest); |
cce855bc JA |
142 | |
143 | switch (error) | |
144 | { | |
145 | case AMBIGUOUS_REDIRECT: | |
5e13499c | 146 | internal_error (_("%s: ambiguous redirect"), filename); |
cce855bc JA |
147 | break; |
148 | ||
149 | case NOCLOBBER_REDIRECT: | |
5e13499c | 150 | internal_error (_("%s: cannot overwrite existing file"), filename); |
cce855bc JA |
151 | break; |
152 | ||
153 | #if defined (RESTRICTED_SHELL) | |
154 | case RESTRICTED_REDIRECT: | |
5e13499c | 155 | internal_error (_("%s: restricted: cannot redirect output"), filename); |
cce855bc JA |
156 | break; |
157 | #endif /* RESTRICTED_SHELL */ | |
158 | ||
159 | case HEREDOC_REDIRECT: | |
adfe6c99 | 160 | internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno)); |
cce855bc JA |
161 | break; |
162 | ||
163 | default: | |
164 | internal_error ("%s: %s", filename, strerror (error)); | |
165 | break; | |
166 | } | |
167 | ||
f73dda09 | 168 | FREE (allocname); |
cce855bc JA |
169 | } |
170 | ||
d3a24ed2 CR |
171 | /* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually |
172 | make input and output file descriptors, otherwise just do whatever is | |
173 | neccessary for side effecting. flags & RX_UNDOABLE says to remember | |
174 | how to undo the redirections later, if non-zero. If flags & RX_CLEXEC | |
175 | is non-zero, file descriptors opened in do_redirection () have their | |
176 | close-on-exec flag set. */ | |
cce855bc | 177 | int |
d3a24ed2 | 178 | do_redirections (list, flags) |
cce855bc | 179 | REDIRECT *list; |
d3a24ed2 | 180 | int flags; |
cce855bc JA |
181 | { |
182 | int error; | |
183 | REDIRECT *temp; | |
184 | ||
d3a24ed2 | 185 | if (flags & RX_UNDOABLE) |
cce855bc JA |
186 | { |
187 | if (redirection_undo_list) | |
188 | { | |
189 | dispose_redirects (redirection_undo_list); | |
190 | redirection_undo_list = (REDIRECT *)NULL; | |
191 | } | |
192 | if (exec_redirection_undo_list) | |
193 | dispose_exec_redirects (); | |
194 | } | |
195 | ||
196 | for (temp = list; temp; temp = temp->next) | |
197 | { | |
d3a24ed2 | 198 | error = do_redirection_internal (temp, flags); |
cce855bc JA |
199 | if (error) |
200 | { | |
201 | redirection_error (temp, error); | |
202 | return (error); | |
203 | } | |
204 | } | |
205 | return (0); | |
206 | } | |
207 | ||
208 | /* Return non-zero if the redirection pointed to by REDIRECT has a | |
209 | redirectee.filename that can be expanded. */ | |
210 | static int | |
211 | expandable_redirection_filename (redirect) | |
212 | REDIRECT *redirect; | |
213 | { | |
214 | switch (redirect->instruction) | |
215 | { | |
216 | case r_output_direction: | |
217 | case r_appending_to: | |
218 | case r_input_direction: | |
219 | case r_inputa_direction: | |
220 | case r_err_and_out: | |
8943768b | 221 | case r_append_err_and_out: |
cce855bc JA |
222 | case r_input_output: |
223 | case r_output_force: | |
224 | case r_duplicating_input_word: | |
225 | case r_duplicating_output_word: | |
7117c2d2 JA |
226 | case r_move_input_word: |
227 | case r_move_output_word: | |
cce855bc JA |
228 | return 1; |
229 | ||
230 | default: | |
231 | return 0; | |
232 | } | |
233 | } | |
234 | ||
235 | /* Expand the word in WORD returning a string. If WORD expands to | |
236 | multiple words (or no words), then return NULL. */ | |
237 | char * | |
238 | redirection_expand (word) | |
239 | WORD_DESC *word; | |
240 | { | |
241 | char *result; | |
242 | WORD_LIST *tlist1, *tlist2; | |
bb70624e JA |
243 | WORD_DESC *w; |
244 | ||
245 | w = copy_word (word); | |
246 | if (posixly_correct) | |
247 | w->flags |= W_NOSPLIT; | |
cce855bc | 248 | |
bb70624e | 249 | tlist1 = make_word_list (w, (WORD_LIST *)NULL); |
d3a24ed2 | 250 | expanding_redir = 1; |
cce855bc | 251 | tlist2 = expand_words_no_vars (tlist1); |
d3a24ed2 | 252 | expanding_redir = 0; |
cce855bc JA |
253 | dispose_words (tlist1); |
254 | ||
255 | if (!tlist2 || tlist2->next) | |
256 | { | |
257 | /* We expanded to no words, or to more than a single word. | |
258 | Dispose of the word list and return NULL. */ | |
259 | if (tlist2) | |
260 | dispose_words (tlist2); | |
261 | return ((char *)NULL); | |
262 | } | |
263 | result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */ | |
264 | dispose_words (tlist2); | |
265 | return (result); | |
266 | } | |
267 | ||
7117c2d2 JA |
268 | static int |
269 | write_here_string (fd, redirectee) | |
270 | int fd; | |
271 | WORD_DESC *redirectee; | |
272 | { | |
273 | char *herestr; | |
274 | int herelen, n, e; | |
275 | ||
276 | herestr = expand_string_to_string (redirectee->word, 0); | |
d3a24ed2 | 277 | herelen = STRLEN (herestr); |
7117c2d2 JA |
278 | |
279 | n = write (fd, herestr, herelen); | |
280 | if (n == herelen) | |
281 | { | |
282 | n = write (fd, "\n", 1); | |
283 | herelen = 1; | |
284 | } | |
285 | e = errno; | |
d3a24ed2 | 286 | FREE (herestr); |
7117c2d2 JA |
287 | if (n != herelen) |
288 | { | |
289 | if (e == 0) | |
290 | e = ENOSPC; | |
291 | return e; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
cce855bc JA |
296 | /* Write the text of the here document pointed to by REDIRECTEE to the file |
297 | descriptor FD, which is already open to a temp file. Return 0 if the | |
298 | write is successful, otherwise return errno. */ | |
299 | static int | |
300 | write_here_document (fd, redirectee) | |
301 | int fd; | |
302 | WORD_DESC *redirectee; | |
303 | { | |
304 | char *document; | |
305 | int document_len, fd2; | |
306 | FILE *fp; | |
307 | register WORD_LIST *t, *tlist; | |
308 | ||
309 | /* Expand the text if the word that was specified had | |
310 | no quoting. The text that we expand is treated | |
311 | exactly as if it were surrounded by double quotes. */ | |
312 | ||
313 | if (redirectee->flags & W_QUOTED) | |
314 | { | |
315 | document = redirectee->word; | |
316 | document_len = strlen (document); | |
317 | /* Set errno to something reasonable if the write fails. */ | |
318 | if (write (fd, document, document_len) < document_len) | |
319 | { | |
320 | if (errno == 0) | |
321 | errno = ENOSPC; | |
322 | return (errno); | |
323 | } | |
324 | else | |
28ef6c31 | 325 | return 0; |
cce855bc JA |
326 | } |
327 | ||
328 | tlist = expand_string (redirectee->word, Q_HERE_DOCUMENT); | |
329 | if (tlist) | |
330 | { | |
331 | /* Try using buffered I/O (stdio) and writing a word | |
332 | at a time, letting stdio do the work of buffering | |
333 | for us rather than managing our own strings. Most | |
334 | stdios are not particularly fast, however -- this | |
335 | may need to be reconsidered later. */ | |
336 | if ((fd2 = dup (fd)) < 0 || (fp = fdopen (fd2, "w")) == NULL) | |
337 | { | |
338 | if (fd2 >= 0) | |
339 | close (fd2); | |
340 | return (errno); | |
341 | } | |
342 | errno = 0; | |
343 | for (t = tlist; t; t = t->next) | |
344 | { | |
345 | /* This is essentially the body of | |
346 | string_list_internal expanded inline. */ | |
347 | document = t->word->word; | |
348 | document_len = strlen (document); | |
349 | if (t != tlist) | |
350 | putc (' ', fp); /* separator */ | |
351 | fwrite (document, document_len, 1, fp); | |
352 | if (ferror (fp)) | |
353 | { | |
354 | if (errno == 0) | |
355 | errno = ENOSPC; | |
356 | fd2 = errno; | |
357 | fclose(fp); | |
358 | dispose_words (tlist); | |
359 | return (fd2); | |
360 | } | |
361 | } | |
cce855bc | 362 | dispose_words (tlist); |
f73dda09 JA |
363 | if (fclose (fp) != 0) |
364 | { | |
365 | if (errno == 0) | |
366 | errno = ENOSPC; | |
367 | return (errno); | |
368 | } | |
cce855bc JA |
369 | } |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* Create a temporary file holding the text of the here document pointed to | |
374 | by REDIRECTEE, and return a file descriptor open for reading to the temp | |
375 | file. Return -1 on any error, and make sure errno is set appropriately. */ | |
376 | static int | |
7117c2d2 | 377 | here_document_to_fd (redirectee, ri) |
cce855bc | 378 | WORD_DESC *redirectee; |
7117c2d2 | 379 | enum r_instruction ri; |
cce855bc | 380 | { |
28ef6c31 | 381 | char *filename; |
bb70624e | 382 | int r, fd, fd2; |
cce855bc | 383 | |
d3ad40de | 384 | fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename); |
cce855bc JA |
385 | |
386 | /* If we failed for some reason other than the file existing, abort */ | |
387 | if (fd < 0) | |
28ef6c31 JA |
388 | { |
389 | FREE (filename); | |
390 | return (fd); | |
391 | } | |
cce855bc JA |
392 | |
393 | errno = r = 0; /* XXX */ | |
394 | /* write_here_document returns 0 on success, errno on failure. */ | |
395 | if (redirectee->word) | |
7117c2d2 JA |
396 | r = (ri != r_reading_string) ? write_here_document (fd, redirectee) |
397 | : write_here_string (fd, redirectee); | |
cce855bc | 398 | |
cce855bc JA |
399 | if (r) |
400 | { | |
bb70624e | 401 | close (fd); |
cce855bc | 402 | unlink (filename); |
28ef6c31 | 403 | free (filename); |
cce855bc JA |
404 | errno = r; |
405 | return (-1); | |
406 | } | |
407 | ||
bb70624e JA |
408 | /* In an attempt to avoid races, we close the first fd only after opening |
409 | the second. */ | |
cce855bc | 410 | /* Make the document really temporary. Also make it the input. */ |
bb70624e | 411 | fd2 = open (filename, O_RDONLY, 0600); |
cce855bc | 412 | |
bb70624e | 413 | if (fd2 < 0) |
cce855bc JA |
414 | { |
415 | r = errno; | |
416 | unlink (filename); | |
28ef6c31 | 417 | free (filename); |
bb70624e | 418 | close (fd); |
cce855bc JA |
419 | errno = r; |
420 | return -1; | |
421 | } | |
422 | ||
bb70624e | 423 | close (fd); |
cce855bc JA |
424 | if (unlink (filename) < 0) |
425 | { | |
426 | r = errno; | |
28ef6c31 JA |
427 | #if defined (__CYGWIN__) |
428 | /* Under CygWin 1.1.0, the unlink will fail if the file is | |
429 | open. This hack will allow the previous action of silently | |
430 | ignoring the error, but will still leave the file there. This | |
431 | needs some kind of magic. */ | |
432 | if (r == EACCES) | |
433 | return (fd2); | |
434 | #endif /* __CYGWIN__ */ | |
bb70624e | 435 | close (fd2); |
28ef6c31 | 436 | free (filename); |
cce855bc JA |
437 | errno = r; |
438 | return (-1); | |
439 | } | |
440 | ||
28ef6c31 | 441 | free (filename); |
bb70624e | 442 | return (fd2); |
cce855bc JA |
443 | } |
444 | ||
bb70624e JA |
445 | #define RF_DEVFD 1 |
446 | #define RF_DEVSTDERR 2 | |
447 | #define RF_DEVSTDIN 3 | |
448 | #define RF_DEVSTDOUT 4 | |
449 | #define RF_DEVTCP 5 | |
450 | #define RF_DEVUDP 6 | |
451 | ||
452 | /* A list of pattern/value pairs for filenames that the redirection | |
453 | code handles specially. */ | |
454 | static STRING_INT_ALIST _redir_special_filenames[] = { | |
455 | #if !defined (HAVE_DEV_FD) | |
456 | { "/dev/fd/[0-9]*", RF_DEVFD }, | |
457 | #endif | |
458 | #if !defined (HAVE_DEV_STDIN) | |
459 | { "/dev/stderr", RF_DEVSTDERR }, | |
460 | { "/dev/stdin", RF_DEVSTDIN }, | |
461 | { "/dev/stdout", RF_DEVSTDOUT }, | |
462 | #endif | |
463 | #if defined (NETWORK_REDIRECTIONS) | |
464 | { "/dev/tcp/*/*", RF_DEVTCP }, | |
465 | { "/dev/udp/*/*", RF_DEVUDP }, | |
466 | #endif | |
467 | { (char *)NULL, -1 } | |
468 | }; | |
469 | ||
470 | static int | |
471 | redir_special_open (spec, filename, flags, mode, ri) | |
472 | int spec; | |
473 | char *filename; | |
474 | int flags, mode; | |
475 | enum r_instruction ri; | |
476 | { | |
477 | int fd; | |
f73dda09 | 478 | #if !defined (HAVE_DEV_FD) |
7117c2d2 | 479 | intmax_t lfd; |
f73dda09 | 480 | #endif |
bb70624e JA |
481 | |
482 | fd = -1; | |
483 | switch (spec) | |
484 | { | |
485 | #if !defined (HAVE_DEV_FD) | |
486 | case RF_DEVFD: | |
f73dda09 JA |
487 | if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd) |
488 | { | |
489 | fd = lfd; | |
b0c16657 | 490 | fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); |
f73dda09 | 491 | } |
bb70624e JA |
492 | else |
493 | fd = AMBIGUOUS_REDIRECT; | |
494 | break; | |
495 | #endif | |
496 | ||
497 | #if !defined (HAVE_DEV_STDIN) | |
498 | case RF_DEVSTDIN: | |
b0c16657 | 499 | fd = fcntl (0, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
500 | break; |
501 | case RF_DEVSTDOUT: | |
b0c16657 | 502 | fd = fcntl (1, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
503 | break; |
504 | case RF_DEVSTDERR: | |
b0c16657 | 505 | fd = fcntl (2, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
506 | break; |
507 | #endif | |
508 | ||
509 | #if defined (NETWORK_REDIRECTIONS) | |
510 | case RF_DEVTCP: | |
511 | case RF_DEVUDP: | |
512 | #if defined (HAVE_NETWORK) | |
513 | fd = netopen (filename); | |
514 | #else | |
5e13499c | 515 | internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking")); |
bb70624e JA |
516 | fd = open (filename, flags, mode); |
517 | #endif | |
518 | break; | |
519 | #endif /* NETWORK_REDIRECTIONS */ | |
520 | } | |
521 | ||
522 | return fd; | |
523 | } | |
524 | ||
cce855bc JA |
525 | /* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most |
526 | race conditions and avoiding the problem where the file is replaced | |
527 | between the stat(2) and open(2). */ | |
528 | static int | |
bb70624e | 529 | noclobber_open (filename, flags, mode, ri) |
cce855bc | 530 | char *filename; |
bb70624e | 531 | int flags, mode; |
cce855bc JA |
532 | enum r_instruction ri; |
533 | { | |
534 | int r, fd; | |
535 | struct stat finfo, finfo2; | |
536 | ||
537 | /* If the file exists and is a regular file, return an error | |
538 | immediately. */ | |
539 | r = stat (filename, &finfo); | |
540 | if (r == 0 && (S_ISREG (finfo.st_mode))) | |
541 | return (NOCLOBBER_REDIRECT); | |
542 | ||
543 | /* If the file was not present (r != 0), make sure we open it | |
544 | exclusively so that if it is created before we open it, our open | |
545 | will fail. Make sure that we do not truncate an existing file. | |
546 | Note that we don't turn on O_EXCL unless the stat failed -- if | |
547 | the file was not a regular file, we leave O_EXCL off. */ | |
548 | flags &= ~O_TRUNC; | |
549 | if (r != 0) | |
550 | { | |
bb70624e | 551 | fd = open (filename, flags|O_EXCL, mode); |
cce855bc JA |
552 | return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd); |
553 | } | |
bb70624e | 554 | fd = open (filename, flags, mode); |
cce855bc JA |
555 | |
556 | /* If the open failed, return the file descriptor right away. */ | |
557 | if (fd < 0) | |
558 | return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd); | |
559 | ||
560 | /* OK, the open succeeded, but the file may have been changed from a | |
561 | non-regular file to a regular file between the stat and the open. | |
562 | We are assuming that the O_EXCL open handles the case where FILENAME | |
563 | did not exist and is symlinked to an existing file between the stat | |
564 | and open. */ | |
565 | ||
566 | /* If we can open it and fstat the file descriptor, and neither check | |
567 | revealed that it was a regular file, and the file has not been replaced, | |
568 | return the file descriptor. */ | |
569 | if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) && | |
570 | r == 0 && (S_ISREG (finfo.st_mode) == 0) && | |
571 | same_file (filename, filename, &finfo, &finfo2)) | |
572 | return fd; | |
573 | ||
574 | /* The file has been replaced. badness. */ | |
575 | close (fd); | |
576 | errno = EEXIST; | |
577 | return (NOCLOBBER_REDIRECT); | |
578 | } | |
579 | ||
bb70624e JA |
580 | static int |
581 | redir_open (filename, flags, mode, ri) | |
582 | char *filename; | |
583 | int flags, mode; | |
584 | enum r_instruction ri; | |
585 | { | |
586 | int fd, r; | |
587 | ||
588 | r = find_string_in_alist (filename, _redir_special_filenames, 1); | |
589 | if (r >= 0) | |
590 | return (redir_special_open (r, filename, flags, mode, ri)); | |
591 | ||
592 | /* If we are in noclobber mode, you are not allowed to overwrite | |
593 | existing files. Check before opening. */ | |
28ef6c31 | 594 | if (noclobber && CLOBBERING_REDIRECT (ri)) |
bb70624e JA |
595 | { |
596 | fd = noclobber_open (filename, flags, mode, ri); | |
597 | if (fd == NOCLOBBER_REDIRECT) | |
598 | return (NOCLOBBER_REDIRECT); | |
599 | } | |
600 | else | |
601 | { | |
602 | fd = open (filename, flags, mode); | |
603 | #if defined (AFS) | |
604 | if ((fd < 0) && (errno == EACCES)) | |
4f00fe31 CR |
605 | { |
606 | fd = open (filename, flags & ~O_CREAT, mode); | |
607 | errno = EACCES; /* restore errno */ | |
608 | } | |
bb70624e JA |
609 | #endif /* AFS */ |
610 | } | |
611 | ||
612 | return fd; | |
613 | } | |
614 | ||
cce855bc JA |
615 | /* Do the specific redirection requested. Returns errno or one of the |
616 | special redirection errors (*_REDIRECT) in case of error, 0 on success. | |
d3a24ed2 CR |
617 | If flags & RX_ACTIVE is zero, then just do whatever is neccessary to |
618 | produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero, | |
619 | says to remember how to undo each redirection. If flags & RX_CLEXEC is | |
620 | non-zero, then we set all file descriptors > 2 that we open to be | |
621 | close-on-exec. */ | |
cce855bc | 622 | static int |
d3a24ed2 | 623 | do_redirection_internal (redirect, flags) |
cce855bc | 624 | REDIRECT *redirect; |
d3a24ed2 | 625 | int flags; |
cce855bc JA |
626 | { |
627 | WORD_DESC *redirectee; | |
bb70624e | 628 | int redir_fd, fd, redirector, r, oflags; |
7117c2d2 | 629 | intmax_t lfd; |
cce855bc JA |
630 | char *redirectee_word; |
631 | enum r_instruction ri; | |
632 | REDIRECT *new_redirect; | |
633 | ||
634 | redirectee = redirect->redirectee.filename; | |
635 | redir_fd = redirect->redirectee.dest; | |
636 | redirector = redirect->redirector; | |
637 | ri = redirect->instruction; | |
638 | ||
d3ad40de CR |
639 | if (redirect->flags & RX_INTERNAL) |
640 | flags |= RX_INTERNAL; | |
e225d5a9 | 641 | |
7117c2d2 | 642 | if (TRANSLATE_REDIRECT (ri)) |
cce855bc | 643 | { |
7117c2d2 | 644 | /* We have [N]>&WORD[-] or [N]<&WORD[-]. Expand WORD, then translate |
cce855bc JA |
645 | the redirection into a new one and continue. */ |
646 | redirectee_word = redirection_expand (redirectee); | |
647 | ||
7117c2d2 JA |
648 | /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93 |
649 | closes N. */ | |
cce855bc JA |
650 | if (redirectee_word == 0) |
651 | return (AMBIGUOUS_REDIRECT); | |
652 | else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0') | |
653 | { | |
f73dda09 | 654 | rd.dest = 0; |
cce855bc JA |
655 | new_redirect = make_redirection (redirector, r_close_this, rd); |
656 | } | |
657 | else if (all_digits (redirectee_word)) | |
658 | { | |
f73dda09 JA |
659 | if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd) |
660 | rd.dest = lfd; | |
cce855bc | 661 | else |
f73dda09 | 662 | rd.dest = -1; /* XXX */ |
7117c2d2 JA |
663 | switch (ri) |
664 | { | |
665 | case r_duplicating_input_word: | |
666 | new_redirect = make_redirection (redirector, r_duplicating_input, rd); | |
667 | break; | |
668 | case r_duplicating_output_word: | |
669 | new_redirect = make_redirection (redirector, r_duplicating_output, rd); | |
670 | break; | |
671 | case r_move_input_word: | |
672 | new_redirect = make_redirection (redirector, r_move_input, rd); | |
673 | break; | |
674 | case r_move_output_word: | |
675 | new_redirect = make_redirection (redirector, r_move_output, rd); | |
676 | break; | |
677 | } | |
cce855bc JA |
678 | } |
679 | else if (ri == r_duplicating_output_word && redirector == 1) | |
680 | { | |
28ef6c31 JA |
681 | rd.filename = make_bare_word (redirectee_word); |
682 | new_redirect = make_redirection (1, r_err_and_out, rd); | |
cce855bc JA |
683 | } |
684 | else | |
685 | { | |
686 | free (redirectee_word); | |
687 | return (AMBIGUOUS_REDIRECT); | |
688 | } | |
689 | ||
690 | free (redirectee_word); | |
691 | ||
692 | /* Set up the variables needed by the rest of the function from the | |
693 | new redirection. */ | |
694 | if (new_redirect->instruction == r_err_and_out) | |
695 | { | |
696 | char *alloca_hack; | |
697 | ||
698 | /* Copy the word without allocating any memory that must be | |
699 | explicitly freed. */ | |
700 | redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC)); | |
701 | xbcopy ((char *)new_redirect->redirectee.filename, | |
702 | (char *)redirectee, sizeof (WORD_DESC)); | |
703 | ||
704 | alloca_hack = (char *) | |
705 | alloca (1 + strlen (new_redirect->redirectee.filename->word)); | |
706 | redirectee->word = alloca_hack; | |
707 | strcpy (redirectee->word, new_redirect->redirectee.filename->word); | |
708 | } | |
709 | else | |
710 | /* It's guaranteed to be an integer, and shouldn't be freed. */ | |
711 | redirectee = new_redirect->redirectee.filename; | |
712 | ||
713 | redir_fd = new_redirect->redirectee.dest; | |
714 | redirector = new_redirect->redirector; | |
715 | ri = new_redirect->instruction; | |
716 | ||
717 | /* Overwrite the flags element of the old redirect with the new value. */ | |
718 | redirect->flags = new_redirect->flags; | |
719 | dispose_redirects (new_redirect); | |
720 | } | |
721 | ||
722 | switch (ri) | |
723 | { | |
724 | case r_output_direction: | |
725 | case r_appending_to: | |
726 | case r_input_direction: | |
727 | case r_inputa_direction: | |
728 | case r_err_and_out: /* command &>filename */ | |
8943768b | 729 | case r_append_err_and_out: /* command &>> filename */ |
cce855bc JA |
730 | case r_input_output: |
731 | case r_output_force: | |
bb70624e | 732 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 JA |
733 | { |
734 | oflags = redirectee->flags; | |
735 | redirectee->flags |= W_NOGLOB; | |
736 | } | |
cce855bc | 737 | redirectee_word = redirection_expand (redirectee); |
bb70624e JA |
738 | if (posixly_correct && interactive_shell == 0) |
739 | redirectee->flags = oflags; | |
cce855bc JA |
740 | |
741 | if (redirectee_word == 0) | |
742 | return (AMBIGUOUS_REDIRECT); | |
743 | ||
744 | #if defined (RESTRICTED_SHELL) | |
745 | if (restricted && (WRITE_REDIRECT (ri))) | |
746 | { | |
747 | free (redirectee_word); | |
748 | return (RESTRICTED_REDIRECT); | |
749 | } | |
750 | #endif /* RESTRICTED_SHELL */ | |
751 | ||
bb70624e | 752 | fd = redir_open (redirectee_word, redirect->flags, 0666, ri); |
cce855bc JA |
753 | free (redirectee_word); |
754 | ||
bb70624e | 755 | if (fd == NOCLOBBER_REDIRECT) |
28ef6c31 | 756 | return (fd); |
bb70624e | 757 | |
cce855bc JA |
758 | if (fd < 0) |
759 | return (errno); | |
760 | ||
d3a24ed2 | 761 | if (flags & RX_ACTIVE) |
cce855bc | 762 | { |
d3a24ed2 | 763 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
764 | { |
765 | /* Only setup to undo it if the thing to undo is active. */ | |
766 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
d3ad40de | 767 | add_undo_redirect (redirector, ri); |
f73dda09 JA |
768 | else |
769 | add_undo_close_redirect (redirector); | |
770 | } | |
cce855bc JA |
771 | |
772 | #if defined (BUFFERED_INPUT) | |
773 | check_bash_input (redirector); | |
774 | #endif | |
775 | ||
b709b946 CR |
776 | /* Make sure there is no pending output before we change the state |
777 | of the underlying file descriptor, since the builtins use stdio | |
778 | for output. */ | |
779 | if (redirector == 1 && fileno (stdout) == redirector) | |
53ac45a3 CR |
780 | { |
781 | fflush (stdout); | |
782 | fpurge (stdout); | |
783 | } | |
b246176e CR |
784 | else if (redirector == 2 && fileno (stderr) == redirector) |
785 | { | |
786 | fflush (stderr); | |
787 | fpurge (stderr); | |
788 | } | |
b709b946 | 789 | |
cce855bc JA |
790 | if ((fd != redirector) && (dup2 (fd, redirector) < 0)) |
791 | return (errno); | |
792 | ||
793 | #if defined (BUFFERED_INPUT) | |
794 | /* Do not change the buffered stream for an implicit redirection | |
795 | of /dev/null to fd 0 for asynchronous commands without job | |
796 | control (r_inputa_direction). */ | |
797 | if (ri == r_input_direction || ri == r_input_output) | |
798 | duplicate_buffered_stream (fd, redirector); | |
799 | #endif /* BUFFERED_INPUT */ | |
800 | ||
801 | /* | |
802 | * If we're remembering, then this is the result of a while, for | |
803 | * or until loop with a loop redirection, or a function/builtin | |
804 | * executing in the parent shell with a redirection. In the | |
805 | * function/builtin case, we want to set all file descriptors > 2 | |
806 | * to be close-on-exec to duplicate the effect of the old | |
807 | * for i = 3 to NOFILE close(i) loop. In the case of the loops, | |
808 | * both sh and ksh leave the file descriptors open across execs. | |
809 | * The Posix standard mentions only the exec builtin. | |
810 | */ | |
d3a24ed2 | 811 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
812 | SET_CLOSE_ON_EXEC (redirector); |
813 | } | |
814 | ||
815 | if (fd != redirector) | |
816 | { | |
817 | #if defined (BUFFERED_INPUT) | |
818 | if (INPUT_REDIRECT (ri)) | |
819 | close_buffered_fd (fd); | |
820 | else | |
821 | #endif /* !BUFFERED_INPUT */ | |
822 | close (fd); /* Don't close what we just opened! */ | |
823 | } | |
824 | ||
825 | /* If we are hacking both stdout and stderr, do the stderr | |
826 | redirection here. */ | |
8943768b | 827 | if (ri == r_err_and_out || ri == r_append_err_and_out) |
cce855bc | 828 | { |
d3a24ed2 | 829 | if (flags & RX_ACTIVE) |
cce855bc | 830 | { |
d3a24ed2 | 831 | if (flags & RX_UNDOABLE) |
d3ad40de | 832 | add_undo_redirect (2, ri); |
cce855bc JA |
833 | if (dup2 (1, 2) < 0) |
834 | return (errno); | |
835 | } | |
836 | } | |
837 | break; | |
838 | ||
839 | case r_reading_until: | |
840 | case r_deblank_reading_until: | |
7117c2d2 | 841 | case r_reading_string: |
cce855bc JA |
842 | /* REDIRECTEE is a pointer to a WORD_DESC containing the text of |
843 | the new input. Place it in a temporary file. */ | |
844 | if (redirectee) | |
845 | { | |
7117c2d2 | 846 | fd = here_document_to_fd (redirectee, ri); |
cce855bc JA |
847 | |
848 | if (fd < 0) | |
849 | { | |
850 | heredoc_errno = errno; | |
851 | return (HEREDOC_REDIRECT); | |
852 | } | |
853 | ||
d3a24ed2 | 854 | if (flags & RX_ACTIVE) |
cce855bc | 855 | { |
d3a24ed2 | 856 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
857 | { |
858 | /* Only setup to undo it if the thing to undo is active. */ | |
859 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
d3ad40de | 860 | add_undo_redirect (redirector, ri); |
f73dda09 JA |
861 | else |
862 | add_undo_close_redirect (redirector); | |
863 | } | |
cce855bc JA |
864 | |
865 | #if defined (BUFFERED_INPUT) | |
866 | check_bash_input (redirector); | |
867 | #endif | |
868 | if (fd != redirector && dup2 (fd, redirector) < 0) | |
869 | { | |
870 | r = errno; | |
871 | close (fd); | |
872 | return (r); | |
873 | } | |
874 | ||
875 | #if defined (BUFFERED_INPUT) | |
876 | duplicate_buffered_stream (fd, redirector); | |
877 | #endif | |
878 | ||
d3a24ed2 | 879 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
880 | SET_CLOSE_ON_EXEC (redirector); |
881 | } | |
882 | ||
bb70624e | 883 | if (fd != redirector) |
cce855bc | 884 | #if defined (BUFFERED_INPUT) |
bb70624e | 885 | close_buffered_fd (fd); |
cce855bc | 886 | #else |
bb70624e | 887 | close (fd); |
cce855bc JA |
888 | #endif |
889 | } | |
890 | break; | |
891 | ||
892 | case r_duplicating_input: | |
893 | case r_duplicating_output: | |
7117c2d2 JA |
894 | case r_move_input: |
895 | case r_move_output: | |
d3a24ed2 | 896 | if ((flags & RX_ACTIVE) && (redir_fd != redirector)) |
cce855bc | 897 | { |
d3a24ed2 | 898 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
899 | { |
900 | /* Only setup to undo it if the thing to undo is active. */ | |
901 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
d3ad40de | 902 | add_undo_redirect (redirector, ri); |
f73dda09 JA |
903 | else |
904 | add_undo_close_redirect (redirector); | |
905 | } | |
cce855bc JA |
906 | #if defined (BUFFERED_INPUT) |
907 | check_bash_input (redirector); | |
908 | #endif | |
909 | /* This is correct. 2>&1 means dup2 (1, 2); */ | |
910 | if (dup2 (redir_fd, redirector) < 0) | |
911 | return (errno); | |
912 | ||
913 | #if defined (BUFFERED_INPUT) | |
7117c2d2 | 914 | if (ri == r_duplicating_input || ri == r_move_input) |
cce855bc JA |
915 | duplicate_buffered_stream (redir_fd, redirector); |
916 | #endif /* BUFFERED_INPUT */ | |
917 | ||
918 | /* First duplicate the close-on-exec state of redirectee. dup2 | |
919 | leaves the flag unset on the new descriptor, which means it | |
920 | stays open. Only set the close-on-exec bit for file descriptors | |
921 | greater than 2 in any case, since 0-2 should always be open | |
f75912ae CR |
922 | unless closed by something like `exec 2<&-'. It should always |
923 | be safe to set fds > 2 to close-on-exec if they're being used to | |
924 | save file descriptors < 2, since we don't need to preserve the | |
925 | state of the close-on-exec flag for those fds -- they should | |
926 | always be open. */ | |
cce855bc JA |
927 | /* if ((already_set || set_unconditionally) && (ok_to_set)) |
928 | set_it () */ | |
e225d5a9 | 929 | #if 0 |
f75912ae | 930 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) && |
cce855bc | 931 | (redirector > 2)) |
e225d5a9 CR |
932 | #else |
933 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) && | |
934 | (redirector > 2)) | |
935 | #endif | |
cce855bc | 936 | SET_CLOSE_ON_EXEC (redirector); |
7117c2d2 JA |
937 | |
938 | /* dup-and-close redirection */ | |
939 | if (ri == r_move_input || ri == r_move_output) | |
09767ff0 CR |
940 | { |
941 | close (redir_fd); | |
942 | #if defined (COPROCESS_SUPPORT) | |
8e1a6eaa | 943 | coproc_fdchk (redir_fd); /* XXX - loses coproc fds */ |
09767ff0 CR |
944 | #endif |
945 | } | |
cce855bc JA |
946 | } |
947 | break; | |
948 | ||
949 | case r_close_this: | |
d3a24ed2 | 950 | if (flags & RX_ACTIVE) |
cce855bc | 951 | { |
d3a24ed2 | 952 | if ((flags & RX_UNDOABLE) && (fcntl (redirector, F_GETFD, 0) != -1)) |
d3ad40de | 953 | add_undo_redirect (redirector, ri); |
cce855bc | 954 | |
09767ff0 | 955 | #if defined (COPROCESS_SUPPORT) |
8e1a6eaa | 956 | coproc_fdchk (redirector); |
09767ff0 CR |
957 | #endif |
958 | ||
cce855bc JA |
959 | #if defined (BUFFERED_INPUT) |
960 | check_bash_input (redirector); | |
961 | close_buffered_fd (redirector); | |
962 | #else /* !BUFFERED_INPUT */ | |
963 | close (redirector); | |
964 | #endif /* !BUFFERED_INPUT */ | |
965 | } | |
966 | break; | |
967 | ||
968 | case r_duplicating_input_word: | |
969 | case r_duplicating_output_word: | |
970 | break; | |
971 | } | |
972 | return (0); | |
973 | } | |
974 | ||
cce855bc JA |
975 | /* Remember the file descriptor associated with the slot FD, |
976 | on REDIRECTION_UNDO_LIST. Note that the list will be reversed | |
977 | before it is executed. Any redirections that need to be undone | |
978 | even if REDIRECTION_UNDO_LIST is discarded by the exec builtin | |
979 | are also saved on EXEC_REDIRECTION_UNDO_LIST. */ | |
980 | static int | |
d3ad40de | 981 | add_undo_redirect (fd, ri) |
cce855bc | 982 | int fd; |
d3ad40de | 983 | enum r_instruction ri; |
cce855bc JA |
984 | { |
985 | int new_fd, clexec_flag; | |
986 | REDIRECT *new_redirect, *closer, *dummy_redirect; | |
987 | ||
988 | new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); | |
989 | ||
990 | if (new_fd < 0) | |
991 | { | |
5e13499c | 992 | sys_error (_("redirection error: cannot duplicate fd")); |
cce855bc JA |
993 | return (-1); |
994 | } | |
995 | ||
996 | clexec_flag = fcntl (fd, F_GETFD, 0); | |
997 | ||
f73dda09 | 998 | rd.dest = 0; |
cce855bc | 999 | closer = make_redirection (new_fd, r_close_this, rd); |
e225d5a9 | 1000 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1001 | dummy_redirect = copy_redirects (closer); |
1002 | ||
f73dda09 | 1003 | rd.dest = new_fd; |
28ef6c31 JA |
1004 | if (fd == 0) |
1005 | new_redirect = make_redirection (fd, r_duplicating_input, rd); | |
1006 | else | |
1007 | new_redirect = make_redirection (fd, r_duplicating_output, rd); | |
e225d5a9 | 1008 | new_redirect->flags |= RX_INTERNAL; |
cce855bc JA |
1009 | new_redirect->next = closer; |
1010 | ||
1011 | closer->next = redirection_undo_list; | |
1012 | redirection_undo_list = new_redirect; | |
1013 | ||
1014 | /* Save redirections that need to be undone even if the undo list | |
1015 | is thrown away by the `exec' builtin. */ | |
1016 | add_exec_redirect (dummy_redirect); | |
1017 | ||
cac4cdbf CR |
1018 | /* experimental: if we're saving a redirection to undo for a file descriptor |
1019 | above SHELL_FD_BASE, add a redirection to be undone if the exec builtin | |
b0c16657 CR |
1020 | causes redirections to be discarded. There needs to be a difference |
1021 | between fds that are used to save other fds and then are the target of | |
1022 | user redirctions and fds that are just the target of user redirections. | |
1023 | We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE | |
1024 | that have the close-on-exec flag set are assumed to be fds used internally | |
1025 | to save others. */ | |
1026 | if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag) | |
cac4cdbf CR |
1027 | { |
1028 | rd.dest = new_fd; | |
1029 | new_redirect = make_redirection (fd, r_duplicating_output, rd); | |
b0c16657 CR |
1030 | new_redirect->flags |= RX_INTERNAL; |
1031 | ||
cac4cdbf | 1032 | add_exec_redirect (new_redirect); |
cac4cdbf CR |
1033 | } |
1034 | ||
cce855bc JA |
1035 | /* File descriptors used only for saving others should always be |
1036 | marked close-on-exec. Unfortunately, we have to preserve the | |
1037 | close-on-exec state of the file descriptor we are saving, since | |
1038 | fcntl (F_DUPFD) sets the new file descriptor to remain open | |
1039 | across execs. If, however, the file descriptor whose state we | |
1040 | are saving is <= 2, we can just set the close-on-exec flag, | |
1041 | because file descriptors 0-2 should always be open-on-exec, | |
1042 | and the restore above in do_redirection() will take care of it. */ | |
1043 | if (clexec_flag || fd < 3) | |
1044 | SET_CLOSE_ON_EXEC (new_fd); | |
1045 | ||
1046 | return (0); | |
1047 | } | |
1048 | ||
1049 | /* Set up to close FD when we are finished with the current command | |
1050 | and its redirections. */ | |
1051 | static void | |
1052 | add_undo_close_redirect (fd) | |
1053 | int fd; | |
1054 | { | |
1055 | REDIRECT *closer; | |
1056 | ||
f73dda09 | 1057 | rd.dest = 0; |
cce855bc | 1058 | closer = make_redirection (fd, r_close_this, rd); |
e225d5a9 | 1059 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1060 | closer->next = redirection_undo_list; |
1061 | redirection_undo_list = closer; | |
1062 | } | |
1063 | ||
1064 | static void | |
1065 | add_exec_redirect (dummy_redirect) | |
1066 | REDIRECT *dummy_redirect; | |
1067 | { | |
1068 | dummy_redirect->next = exec_redirection_undo_list; | |
1069 | exec_redirection_undo_list = dummy_redirect; | |
1070 | } | |
1071 | ||
bb70624e JA |
1072 | /* Return 1 if the redirection specified by RI and REDIRECTOR alters the |
1073 | standard input. */ | |
1074 | static int | |
1075 | stdin_redirection (ri, redirector) | |
1076 | enum r_instruction ri; | |
1077 | int redirector; | |
1078 | { | |
1079 | switch (ri) | |
1080 | { | |
1081 | case r_input_direction: | |
1082 | case r_inputa_direction: | |
1083 | case r_input_output: | |
1084 | case r_reading_until: | |
1085 | case r_deblank_reading_until: | |
7117c2d2 | 1086 | case r_reading_string: |
bb70624e JA |
1087 | return (1); |
1088 | case r_duplicating_input: | |
1089 | case r_duplicating_input_word: | |
1090 | case r_close_this: | |
1091 | return (redirector == 0); | |
1092 | case r_output_direction: | |
1093 | case r_appending_to: | |
1094 | case r_duplicating_output: | |
1095 | case r_err_and_out: | |
8943768b | 1096 | case r_append_err_and_out: |
bb70624e JA |
1097 | case r_output_force: |
1098 | case r_duplicating_output_word: | |
1099 | return (0); | |
1100 | } | |
1101 | return (0); | |
1102 | } | |
1103 | ||
cce855bc JA |
1104 | /* Return non-zero if any of the redirections in REDIRS alter the standard |
1105 | input. */ | |
1106 | int | |
1107 | stdin_redirects (redirs) | |
1108 | REDIRECT *redirs; | |
1109 | { | |
1110 | REDIRECT *rp; | |
1111 | int n; | |
1112 | ||
1113 | for (n = 0, rp = redirs; rp; rp = rp->next) | |
bb70624e | 1114 | n += stdin_redirection (rp->instruction, rp->redirector); |
cce855bc JA |
1115 | return n; |
1116 | } |