]>
Commit | Line | Data |
---|---|---|
cce855bc JA |
1 | /* redir.c -- Functions to perform input and output redirection. */ |
2 | ||
3185942a | 3 | /* Copyright (C) 1997-2009 Free Software Foundation, Inc. |
cce855bc JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
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 | |
3185942a JA |
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 | |
3185942a JA |
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" | |
b80f6443 | 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" | |
b80f6443 | 46 | #include "bashintl.h" |
cce855bc | 47 | #include "memalloc.h" |
3185942a JA |
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 | ||
3185942a JA |
60 | #define SHELL_FD_BASE 10 |
61 | ||
b80f6443 JA |
62 | int expanding_redir; |
63 | ||
cce855bc | 64 | extern int posixly_correct; |
495aee44 | 65 | extern int last_command_exit_value; |
cce855bc JA |
66 | extern REDIRECT *redirection_undo_list; |
67 | extern REDIRECT *exec_redirection_undo_list; | |
68 | ||
69 | /* Static functions defined and used in this file. */ | |
f73dda09 | 70 | static void add_exec_redirect __P((REDIRECT *)); |
3185942a | 71 | static int add_undo_redirect __P((int, enum r_instruction, int)); |
495aee44 | 72 | static int add_undo_close_redirect __P((int)); |
f73dda09 JA |
73 | static int expandable_redirection_filename __P((REDIRECT *)); |
74 | static int stdin_redirection __P((enum r_instruction, int)); | |
3185942a | 75 | static int undoablefd __P((int)); |
b80f6443 | 76 | static int do_redirection_internal __P((REDIRECT *, int)); |
f73dda09 JA |
77 | |
78 | static int write_here_document __P((int, WORD_DESC *)); | |
7117c2d2 JA |
79 | static int write_here_string __P((int, WORD_DESC *)); |
80 | static int here_document_to_fd __P((WORD_DESC *, enum r_instruction)); | |
f73dda09 JA |
81 | |
82 | static int redir_special_open __P((int, char *, int, int, enum r_instruction)); | |
83 | static int noclobber_open __P((char *, int, int, enum r_instruction)); | |
84 | static int redir_open __P((char *, int, int, enum r_instruction)); | |
cce855bc | 85 | |
0001803f CR |
86 | static int redir_varassign __P((REDIRECT *, int)); |
87 | static int redir_varvalue __P((REDIRECT *)); | |
88 | ||
7117c2d2 JA |
89 | /* Spare redirector used when translating [N]>&WORD[-] or [N]<&WORD[-] to |
90 | a new redirection and when creating the redirection undo list. */ | |
cce855bc JA |
91 | static REDIRECTEE rd; |
92 | ||
93 | /* Set to errno when a here document cannot be created for some reason. | |
94 | Used to print a reasonable error message. */ | |
95 | static int heredoc_errno; | |
96 | ||
495aee44 CR |
97 | #define REDIRECTION_ERROR(r, e, fd) \ |
98 | do { \ | |
99 | if ((r) < 0) \ | |
100 | { \ | |
101 | if (fd >= 0) \ | |
102 | close (fd); \ | |
103 | last_command_exit_value = EXECUTION_FAILURE;\ | |
104 | return ((e) == 0 ? EINVAL : (e));\ | |
105 | } \ | |
106 | } while (0) | |
107 | ||
cce855bc JA |
108 | void |
109 | redirection_error (temp, error) | |
110 | REDIRECT *temp; | |
111 | int error; | |
112 | { | |
f73dda09 | 113 | char *filename, *allocname; |
bb70624e | 114 | int oflags; |
cce855bc | 115 | |
f73dda09 | 116 | allocname = 0; |
0001803f CR |
117 | if (temp->rflags & REDIR_VARASSIGN) |
118 | filename = savestring (temp->redirector.filename->word); | |
119 | else if (temp->redirector.dest < 0) | |
f73dda09 JA |
120 | /* This can happen when read_token_word encounters overflow, like in |
121 | exec 4294967297>x */ | |
b80f6443 | 122 | filename = _("file descriptor out of range"); |
f73dda09 | 123 | #ifdef EBADF |
3185942a | 124 | /* This error can never involve NOCLOBBER */ |
0001803f | 125 | else if (error != NOCLOBBER_REDIRECT && temp->redirector.dest >= 0 && error == EBADF) |
7117c2d2 JA |
126 | { |
127 | /* If we're dealing with two file descriptors, we have to guess about | |
128 | which one is invalid; in the cases of r_{duplicating,move}_input and | |
129 | r_{duplicating,move}_output we're here because dup2() failed. */ | |
130 | switch (temp->instruction) | |
131 | { | |
132 | case r_duplicating_input: | |
133 | case r_duplicating_output: | |
134 | case r_move_input: | |
135 | case r_move_output: | |
136 | filename = allocname = itos (temp->redirectee.dest); | |
137 | break; | |
0001803f CR |
138 | case r_duplicating_input_word: |
139 | if (temp->redirector.dest == 0) /* Guess */ | |
140 | filename = temp->redirectee.filename->word; /* XXX */ | |
141 | else | |
142 | filename = allocname = itos (temp->redirector.dest); | |
143 | break; | |
144 | case r_duplicating_output_word: | |
145 | if (temp->redirector.dest == 1) /* Guess */ | |
146 | filename = temp->redirectee.filename->word; /* XXX */ | |
147 | else | |
148 | filename = allocname = itos (temp->redirector.dest); | |
149 | break; | |
7117c2d2 | 150 | default: |
0001803f | 151 | filename = allocname = itos (temp->redirector.dest); |
7117c2d2 JA |
152 | break; |
153 | } | |
154 | } | |
f73dda09 JA |
155 | #endif |
156 | else if (expandable_redirection_filename (temp)) | |
cce855bc | 157 | { |
0001803f | 158 | expandable_filename: |
bb70624e JA |
159 | if (posixly_correct && interactive_shell == 0) |
160 | { | |
161 | oflags = temp->redirectee.filename->flags; | |
162 | temp->redirectee.filename->flags |= W_NOGLOB; | |
163 | } | |
f73dda09 | 164 | filename = allocname = redirection_expand (temp->redirectee.filename); |
bb70624e | 165 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 | 166 | temp->redirectee.filename->flags = oflags; |
cce855bc | 167 | if (filename == 0) |
f73dda09 | 168 | filename = temp->redirectee.filename->word; |
cce855bc | 169 | } |
f73dda09 JA |
170 | else if (temp->redirectee.dest < 0) |
171 | filename = "file descriptor out of range"; | |
cce855bc | 172 | else |
f73dda09 | 173 | filename = allocname = itos (temp->redirectee.dest); |
cce855bc JA |
174 | |
175 | switch (error) | |
176 | { | |
177 | case AMBIGUOUS_REDIRECT: | |
b80f6443 | 178 | internal_error (_("%s: ambiguous redirect"), filename); |
cce855bc JA |
179 | break; |
180 | ||
181 | case NOCLOBBER_REDIRECT: | |
b80f6443 | 182 | internal_error (_("%s: cannot overwrite existing file"), filename); |
cce855bc JA |
183 | break; |
184 | ||
185 | #if defined (RESTRICTED_SHELL) | |
186 | case RESTRICTED_REDIRECT: | |
b80f6443 | 187 | internal_error (_("%s: restricted: cannot redirect output"), filename); |
cce855bc JA |
188 | break; |
189 | #endif /* RESTRICTED_SHELL */ | |
190 | ||
191 | case HEREDOC_REDIRECT: | |
3185942a | 192 | internal_error (_("cannot create temp file for here-document: %s"), strerror (heredoc_errno)); |
cce855bc JA |
193 | break; |
194 | ||
0001803f CR |
195 | case BADVAR_REDIRECT: |
196 | internal_error (_("%s: cannot assign fd to variable"), filename); | |
197 | break; | |
198 | ||
cce855bc JA |
199 | default: |
200 | internal_error ("%s: %s", filename, strerror (error)); | |
201 | break; | |
202 | } | |
203 | ||
f73dda09 | 204 | FREE (allocname); |
cce855bc JA |
205 | } |
206 | ||
b80f6443 JA |
207 | /* Perform the redirections on LIST. If flags & RX_ACTIVE, then actually |
208 | make input and output file descriptors, otherwise just do whatever is | |
209 | neccessary for side effecting. flags & RX_UNDOABLE says to remember | |
210 | how to undo the redirections later, if non-zero. If flags & RX_CLEXEC | |
211 | is non-zero, file descriptors opened in do_redirection () have their | |
212 | close-on-exec flag set. */ | |
cce855bc | 213 | int |
b80f6443 | 214 | do_redirections (list, flags) |
cce855bc | 215 | REDIRECT *list; |
b80f6443 | 216 | int flags; |
cce855bc JA |
217 | { |
218 | int error; | |
219 | REDIRECT *temp; | |
220 | ||
b80f6443 | 221 | if (flags & RX_UNDOABLE) |
cce855bc JA |
222 | { |
223 | if (redirection_undo_list) | |
224 | { | |
225 | dispose_redirects (redirection_undo_list); | |
226 | redirection_undo_list = (REDIRECT *)NULL; | |
227 | } | |
228 | if (exec_redirection_undo_list) | |
229 | dispose_exec_redirects (); | |
230 | } | |
231 | ||
232 | for (temp = list; temp; temp = temp->next) | |
233 | { | |
b80f6443 | 234 | error = do_redirection_internal (temp, flags); |
cce855bc JA |
235 | if (error) |
236 | { | |
237 | redirection_error (temp, error); | |
238 | return (error); | |
239 | } | |
240 | } | |
241 | return (0); | |
242 | } | |
243 | ||
244 | /* Return non-zero if the redirection pointed to by REDIRECT has a | |
245 | redirectee.filename that can be expanded. */ | |
246 | static int | |
247 | expandable_redirection_filename (redirect) | |
248 | REDIRECT *redirect; | |
249 | { | |
250 | switch (redirect->instruction) | |
251 | { | |
252 | case r_output_direction: | |
253 | case r_appending_to: | |
254 | case r_input_direction: | |
255 | case r_inputa_direction: | |
256 | case r_err_and_out: | |
3185942a | 257 | case r_append_err_and_out: |
cce855bc JA |
258 | case r_input_output: |
259 | case r_output_force: | |
260 | case r_duplicating_input_word: | |
261 | case r_duplicating_output_word: | |
7117c2d2 JA |
262 | case r_move_input_word: |
263 | case r_move_output_word: | |
cce855bc JA |
264 | return 1; |
265 | ||
266 | default: | |
267 | return 0; | |
268 | } | |
269 | } | |
270 | ||
271 | /* Expand the word in WORD returning a string. If WORD expands to | |
272 | multiple words (or no words), then return NULL. */ | |
273 | char * | |
274 | redirection_expand (word) | |
275 | WORD_DESC *word; | |
276 | { | |
277 | char *result; | |
278 | WORD_LIST *tlist1, *tlist2; | |
bb70624e JA |
279 | WORD_DESC *w; |
280 | ||
281 | w = copy_word (word); | |
282 | if (posixly_correct) | |
283 | w->flags |= W_NOSPLIT; | |
cce855bc | 284 | |
bb70624e | 285 | tlist1 = make_word_list (w, (WORD_LIST *)NULL); |
b80f6443 | 286 | expanding_redir = 1; |
cce855bc | 287 | tlist2 = expand_words_no_vars (tlist1); |
b80f6443 | 288 | expanding_redir = 0; |
cce855bc JA |
289 | dispose_words (tlist1); |
290 | ||
291 | if (!tlist2 || tlist2->next) | |
292 | { | |
293 | /* We expanded to no words, or to more than a single word. | |
294 | Dispose of the word list and return NULL. */ | |
295 | if (tlist2) | |
296 | dispose_words (tlist2); | |
297 | return ((char *)NULL); | |
298 | } | |
299 | result = string_list (tlist2); /* XXX savestring (tlist2->word->word)? */ | |
300 | dispose_words (tlist2); | |
301 | return (result); | |
302 | } | |
303 | ||
7117c2d2 JA |
304 | static int |
305 | write_here_string (fd, redirectee) | |
306 | int fd; | |
307 | WORD_DESC *redirectee; | |
308 | { | |
309 | char *herestr; | |
310 | int herelen, n, e; | |
311 | ||
0001803f | 312 | expanding_redir = 1; |
7117c2d2 | 313 | herestr = expand_string_to_string (redirectee->word, 0); |
0001803f | 314 | expanding_redir = 0; |
b80f6443 | 315 | herelen = STRLEN (herestr); |
7117c2d2 JA |
316 | |
317 | n = write (fd, herestr, herelen); | |
318 | if (n == herelen) | |
319 | { | |
320 | n = write (fd, "\n", 1); | |
321 | herelen = 1; | |
322 | } | |
323 | e = errno; | |
b80f6443 | 324 | FREE (herestr); |
7117c2d2 JA |
325 | if (n != herelen) |
326 | { | |
327 | if (e == 0) | |
328 | e = ENOSPC; | |
329 | return e; | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
cce855bc JA |
334 | /* Write the text of the here document pointed to by REDIRECTEE to the file |
335 | descriptor FD, which is already open to a temp file. Return 0 if the | |
336 | write is successful, otherwise return errno. */ | |
337 | static int | |
338 | write_here_document (fd, redirectee) | |
339 | int fd; | |
340 | WORD_DESC *redirectee; | |
341 | { | |
342 | char *document; | |
343 | int document_len, fd2; | |
344 | FILE *fp; | |
345 | register WORD_LIST *t, *tlist; | |
346 | ||
347 | /* Expand the text if the word that was specified had | |
348 | no quoting. The text that we expand is treated | |
349 | exactly as if it were surrounded by double quotes. */ | |
350 | ||
351 | if (redirectee->flags & W_QUOTED) | |
352 | { | |
353 | document = redirectee->word; | |
354 | document_len = strlen (document); | |
355 | /* Set errno to something reasonable if the write fails. */ | |
356 | if (write (fd, document, document_len) < document_len) | |
357 | { | |
358 | if (errno == 0) | |
359 | errno = ENOSPC; | |
360 | return (errno); | |
361 | } | |
362 | else | |
28ef6c31 | 363 | return 0; |
cce855bc JA |
364 | } |
365 | ||
0001803f | 366 | expanding_redir = 1; |
cce855bc | 367 | tlist = expand_string (redirectee->word, Q_HERE_DOCUMENT); |
0001803f CR |
368 | expanding_redir = 0; |
369 | ||
cce855bc JA |
370 | if (tlist) |
371 | { | |
372 | /* Try using buffered I/O (stdio) and writing a word | |
373 | at a time, letting stdio do the work of buffering | |
374 | for us rather than managing our own strings. Most | |
375 | stdios are not particularly fast, however -- this | |
376 | may need to be reconsidered later. */ | |
377 | if ((fd2 = dup (fd)) < 0 || (fp = fdopen (fd2, "w")) == NULL) | |
378 | { | |
379 | if (fd2 >= 0) | |
380 | close (fd2); | |
381 | return (errno); | |
382 | } | |
383 | errno = 0; | |
384 | for (t = tlist; t; t = t->next) | |
385 | { | |
386 | /* This is essentially the body of | |
387 | string_list_internal expanded inline. */ | |
388 | document = t->word->word; | |
389 | document_len = strlen (document); | |
390 | if (t != tlist) | |
391 | putc (' ', fp); /* separator */ | |
392 | fwrite (document, document_len, 1, fp); | |
393 | if (ferror (fp)) | |
394 | { | |
395 | if (errno == 0) | |
396 | errno = ENOSPC; | |
397 | fd2 = errno; | |
398 | fclose(fp); | |
399 | dispose_words (tlist); | |
400 | return (fd2); | |
401 | } | |
402 | } | |
cce855bc | 403 | dispose_words (tlist); |
f73dda09 JA |
404 | if (fclose (fp) != 0) |
405 | { | |
406 | if (errno == 0) | |
407 | errno = ENOSPC; | |
408 | return (errno); | |
409 | } | |
cce855bc JA |
410 | } |
411 | return 0; | |
412 | } | |
413 | ||
414 | /* Create a temporary file holding the text of the here document pointed to | |
415 | by REDIRECTEE, and return a file descriptor open for reading to the temp | |
416 | file. Return -1 on any error, and make sure errno is set appropriately. */ | |
417 | static int | |
7117c2d2 | 418 | here_document_to_fd (redirectee, ri) |
cce855bc | 419 | WORD_DESC *redirectee; |
7117c2d2 | 420 | enum r_instruction ri; |
cce855bc | 421 | { |
28ef6c31 | 422 | char *filename; |
bb70624e | 423 | int r, fd, fd2; |
cce855bc | 424 | |
3185942a | 425 | fd = sh_mktmpfd ("sh-thd", MT_USERANDOM|MT_USETMPDIR, &filename); |
cce855bc JA |
426 | |
427 | /* If we failed for some reason other than the file existing, abort */ | |
428 | if (fd < 0) | |
28ef6c31 JA |
429 | { |
430 | FREE (filename); | |
431 | return (fd); | |
432 | } | |
cce855bc JA |
433 | |
434 | errno = r = 0; /* XXX */ | |
435 | /* write_here_document returns 0 on success, errno on failure. */ | |
436 | if (redirectee->word) | |
7117c2d2 JA |
437 | r = (ri != r_reading_string) ? write_here_document (fd, redirectee) |
438 | : write_here_string (fd, redirectee); | |
cce855bc | 439 | |
cce855bc JA |
440 | if (r) |
441 | { | |
bb70624e | 442 | close (fd); |
cce855bc | 443 | unlink (filename); |
28ef6c31 | 444 | free (filename); |
cce855bc JA |
445 | errno = r; |
446 | return (-1); | |
447 | } | |
448 | ||
bb70624e JA |
449 | /* In an attempt to avoid races, we close the first fd only after opening |
450 | the second. */ | |
cce855bc | 451 | /* Make the document really temporary. Also make it the input. */ |
495aee44 | 452 | fd2 = open (filename, O_RDONLY|O_BINARY, 0600); |
cce855bc | 453 | |
bb70624e | 454 | if (fd2 < 0) |
cce855bc JA |
455 | { |
456 | r = errno; | |
457 | unlink (filename); | |
28ef6c31 | 458 | free (filename); |
bb70624e | 459 | close (fd); |
cce855bc JA |
460 | errno = r; |
461 | return -1; | |
462 | } | |
463 | ||
bb70624e | 464 | close (fd); |
cce855bc JA |
465 | if (unlink (filename) < 0) |
466 | { | |
467 | r = errno; | |
bb70624e | 468 | close (fd2); |
28ef6c31 | 469 | free (filename); |
cce855bc JA |
470 | errno = r; |
471 | return (-1); | |
472 | } | |
473 | ||
28ef6c31 | 474 | free (filename); |
bb70624e | 475 | return (fd2); |
cce855bc JA |
476 | } |
477 | ||
bb70624e JA |
478 | #define RF_DEVFD 1 |
479 | #define RF_DEVSTDERR 2 | |
480 | #define RF_DEVSTDIN 3 | |
481 | #define RF_DEVSTDOUT 4 | |
482 | #define RF_DEVTCP 5 | |
483 | #define RF_DEVUDP 6 | |
484 | ||
485 | /* A list of pattern/value pairs for filenames that the redirection | |
486 | code handles specially. */ | |
487 | static STRING_INT_ALIST _redir_special_filenames[] = { | |
488 | #if !defined (HAVE_DEV_FD) | |
489 | { "/dev/fd/[0-9]*", RF_DEVFD }, | |
490 | #endif | |
491 | #if !defined (HAVE_DEV_STDIN) | |
492 | { "/dev/stderr", RF_DEVSTDERR }, | |
493 | { "/dev/stdin", RF_DEVSTDIN }, | |
494 | { "/dev/stdout", RF_DEVSTDOUT }, | |
495 | #endif | |
496 | #if defined (NETWORK_REDIRECTIONS) | |
497 | { "/dev/tcp/*/*", RF_DEVTCP }, | |
498 | { "/dev/udp/*/*", RF_DEVUDP }, | |
499 | #endif | |
500 | { (char *)NULL, -1 } | |
501 | }; | |
502 | ||
503 | static int | |
504 | redir_special_open (spec, filename, flags, mode, ri) | |
505 | int spec; | |
506 | char *filename; | |
507 | int flags, mode; | |
508 | enum r_instruction ri; | |
509 | { | |
510 | int fd; | |
f73dda09 | 511 | #if !defined (HAVE_DEV_FD) |
7117c2d2 | 512 | intmax_t lfd; |
f73dda09 | 513 | #endif |
bb70624e JA |
514 | |
515 | fd = -1; | |
516 | switch (spec) | |
517 | { | |
518 | #if !defined (HAVE_DEV_FD) | |
519 | case RF_DEVFD: | |
f73dda09 JA |
520 | if (all_digits (filename+8) && legal_number (filename+8, &lfd) && lfd == (int)lfd) |
521 | { | |
522 | fd = lfd; | |
3185942a | 523 | fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); |
f73dda09 | 524 | } |
bb70624e JA |
525 | else |
526 | fd = AMBIGUOUS_REDIRECT; | |
527 | break; | |
528 | #endif | |
529 | ||
530 | #if !defined (HAVE_DEV_STDIN) | |
531 | case RF_DEVSTDIN: | |
3185942a | 532 | fd = fcntl (0, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
533 | break; |
534 | case RF_DEVSTDOUT: | |
3185942a | 535 | fd = fcntl (1, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
536 | break; |
537 | case RF_DEVSTDERR: | |
3185942a | 538 | fd = fcntl (2, F_DUPFD, SHELL_FD_BASE); |
bb70624e JA |
539 | break; |
540 | #endif | |
541 | ||
542 | #if defined (NETWORK_REDIRECTIONS) | |
543 | case RF_DEVTCP: | |
544 | case RF_DEVUDP: | |
545 | #if defined (HAVE_NETWORK) | |
546 | fd = netopen (filename); | |
547 | #else | |
b80f6443 | 548 | internal_warning (_("/dev/(tcp|udp)/host/port not supported without networking")); |
bb70624e JA |
549 | fd = open (filename, flags, mode); |
550 | #endif | |
551 | break; | |
552 | #endif /* NETWORK_REDIRECTIONS */ | |
553 | } | |
554 | ||
555 | return fd; | |
556 | } | |
557 | ||
cce855bc JA |
558 | /* Open FILENAME with FLAGS in noclobber mode, hopefully avoiding most |
559 | race conditions and avoiding the problem where the file is replaced | |
560 | between the stat(2) and open(2). */ | |
561 | static int | |
bb70624e | 562 | noclobber_open (filename, flags, mode, ri) |
cce855bc | 563 | char *filename; |
bb70624e | 564 | int flags, mode; |
cce855bc JA |
565 | enum r_instruction ri; |
566 | { | |
567 | int r, fd; | |
568 | struct stat finfo, finfo2; | |
569 | ||
570 | /* If the file exists and is a regular file, return an error | |
571 | immediately. */ | |
572 | r = stat (filename, &finfo); | |
573 | if (r == 0 && (S_ISREG (finfo.st_mode))) | |
574 | return (NOCLOBBER_REDIRECT); | |
575 | ||
576 | /* If the file was not present (r != 0), make sure we open it | |
577 | exclusively so that if it is created before we open it, our open | |
578 | will fail. Make sure that we do not truncate an existing file. | |
579 | Note that we don't turn on O_EXCL unless the stat failed -- if | |
580 | the file was not a regular file, we leave O_EXCL off. */ | |
581 | flags &= ~O_TRUNC; | |
582 | if (r != 0) | |
583 | { | |
bb70624e | 584 | fd = open (filename, flags|O_EXCL, mode); |
cce855bc JA |
585 | return ((fd < 0 && errno == EEXIST) ? NOCLOBBER_REDIRECT : fd); |
586 | } | |
bb70624e | 587 | fd = open (filename, flags, mode); |
cce855bc JA |
588 | |
589 | /* If the open failed, return the file descriptor right away. */ | |
590 | if (fd < 0) | |
591 | return (errno == EEXIST ? NOCLOBBER_REDIRECT : fd); | |
592 | ||
593 | /* OK, the open succeeded, but the file may have been changed from a | |
594 | non-regular file to a regular file between the stat and the open. | |
595 | We are assuming that the O_EXCL open handles the case where FILENAME | |
596 | did not exist and is symlinked to an existing file between the stat | |
597 | and open. */ | |
598 | ||
599 | /* If we can open it and fstat the file descriptor, and neither check | |
600 | revealed that it was a regular file, and the file has not been replaced, | |
601 | return the file descriptor. */ | |
602 | if ((fstat (fd, &finfo2) == 0) && (S_ISREG (finfo2.st_mode) == 0) && | |
603 | r == 0 && (S_ISREG (finfo.st_mode) == 0) && | |
604 | same_file (filename, filename, &finfo, &finfo2)) | |
605 | return fd; | |
606 | ||
607 | /* The file has been replaced. badness. */ | |
608 | close (fd); | |
609 | errno = EEXIST; | |
610 | return (NOCLOBBER_REDIRECT); | |
611 | } | |
612 | ||
bb70624e JA |
613 | static int |
614 | redir_open (filename, flags, mode, ri) | |
615 | char *filename; | |
616 | int flags, mode; | |
617 | enum r_instruction ri; | |
618 | { | |
619 | int fd, r; | |
620 | ||
621 | r = find_string_in_alist (filename, _redir_special_filenames, 1); | |
622 | if (r >= 0) | |
623 | return (redir_special_open (r, filename, flags, mode, ri)); | |
624 | ||
625 | /* If we are in noclobber mode, you are not allowed to overwrite | |
626 | existing files. Check before opening. */ | |
28ef6c31 | 627 | if (noclobber && CLOBBERING_REDIRECT (ri)) |
bb70624e JA |
628 | { |
629 | fd = noclobber_open (filename, flags, mode, ri); | |
630 | if (fd == NOCLOBBER_REDIRECT) | |
631 | return (NOCLOBBER_REDIRECT); | |
632 | } | |
633 | else | |
634 | { | |
635 | fd = open (filename, flags, mode); | |
636 | #if defined (AFS) | |
637 | if ((fd < 0) && (errno == EACCES)) | |
95732b49 JA |
638 | { |
639 | fd = open (filename, flags & ~O_CREAT, mode); | |
640 | errno = EACCES; /* restore errno */ | |
641 | } | |
bb70624e JA |
642 | #endif /* AFS */ |
643 | } | |
644 | ||
645 | return fd; | |
646 | } | |
647 | ||
3185942a JA |
648 | static int |
649 | undoablefd (fd) | |
650 | int fd; | |
651 | { | |
652 | int clexec; | |
653 | ||
654 | clexec = fcntl (fd, F_GETFD, 0); | |
655 | if (clexec == -1 || (fd >= SHELL_FD_BASE && clexec == 1)) | |
656 | return 0; | |
657 | return 1; | |
658 | } | |
659 | ||
cce855bc JA |
660 | /* Do the specific redirection requested. Returns errno or one of the |
661 | special redirection errors (*_REDIRECT) in case of error, 0 on success. | |
b80f6443 JA |
662 | If flags & RX_ACTIVE is zero, then just do whatever is neccessary to |
663 | produce the appropriate side effects. flags & RX_UNDOABLE, if non-zero, | |
664 | says to remember how to undo each redirection. If flags & RX_CLEXEC is | |
665 | non-zero, then we set all file descriptors > 2 that we open to be | |
666 | close-on-exec. */ | |
cce855bc | 667 | static int |
b80f6443 | 668 | do_redirection_internal (redirect, flags) |
cce855bc | 669 | REDIRECT *redirect; |
b80f6443 | 670 | int flags; |
cce855bc JA |
671 | { |
672 | WORD_DESC *redirectee; | |
bb70624e | 673 | int redir_fd, fd, redirector, r, oflags; |
7117c2d2 | 674 | intmax_t lfd; |
cce855bc JA |
675 | char *redirectee_word; |
676 | enum r_instruction ri; | |
677 | REDIRECT *new_redirect; | |
0001803f | 678 | REDIRECTEE sd; |
cce855bc JA |
679 | |
680 | redirectee = redirect->redirectee.filename; | |
681 | redir_fd = redirect->redirectee.dest; | |
0001803f | 682 | redirector = redirect->redirector.dest; |
cce855bc JA |
683 | ri = redirect->instruction; |
684 | ||
0628567a JA |
685 | if (redirect->flags & RX_INTERNAL) |
686 | flags |= RX_INTERNAL; | |
95732b49 | 687 | |
7117c2d2 | 688 | if (TRANSLATE_REDIRECT (ri)) |
cce855bc | 689 | { |
0001803f CR |
690 | /* We have [N]>&WORD[-] or [N]<&WORD[-] (or {V}>&WORD[-] or {V}<&WORD-). |
691 | and WORD, then translate the redirection into a new one and | |
692 | continue. */ | |
cce855bc JA |
693 | redirectee_word = redirection_expand (redirectee); |
694 | ||
7117c2d2 JA |
695 | /* XXX - what to do with [N]<&$w- where w is unset or null? ksh93 |
696 | closes N. */ | |
cce855bc JA |
697 | if (redirectee_word == 0) |
698 | return (AMBIGUOUS_REDIRECT); | |
699 | else if (redirectee_word[0] == '-' && redirectee_word[1] == '\0') | |
700 | { | |
0001803f | 701 | sd = redirect->redirector; |
f73dda09 | 702 | rd.dest = 0; |
0001803f | 703 | new_redirect = make_redirection (sd, r_close_this, rd, 0); |
cce855bc JA |
704 | } |
705 | else if (all_digits (redirectee_word)) | |
706 | { | |
0001803f | 707 | sd = redirect->redirector; |
f73dda09 JA |
708 | if (legal_number (redirectee_word, &lfd) && (int)lfd == lfd) |
709 | rd.dest = lfd; | |
cce855bc | 710 | else |
f73dda09 | 711 | rd.dest = -1; /* XXX */ |
7117c2d2 JA |
712 | switch (ri) |
713 | { | |
714 | case r_duplicating_input_word: | |
0001803f | 715 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
7117c2d2 JA |
716 | break; |
717 | case r_duplicating_output_word: | |
0001803f | 718 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
7117c2d2 JA |
719 | break; |
720 | case r_move_input_word: | |
0001803f | 721 | new_redirect = make_redirection (sd, r_move_input, rd, 0); |
7117c2d2 JA |
722 | break; |
723 | case r_move_output_word: | |
0001803f | 724 | new_redirect = make_redirection (sd, r_move_output, rd, 0); |
7117c2d2 JA |
725 | break; |
726 | } | |
cce855bc | 727 | } |
0001803f | 728 | else if (ri == r_duplicating_output_word && (redirect->rflags & REDIR_VARASSIGN) == 0 && redirector == 1) |
cce855bc | 729 | { |
0001803f | 730 | sd = redirect->redirector; |
28ef6c31 | 731 | rd.filename = make_bare_word (redirectee_word); |
0001803f | 732 | new_redirect = make_redirection (sd, r_err_and_out, rd, 0); |
cce855bc JA |
733 | } |
734 | else | |
735 | { | |
736 | free (redirectee_word); | |
737 | return (AMBIGUOUS_REDIRECT); | |
738 | } | |
739 | ||
740 | free (redirectee_word); | |
741 | ||
742 | /* Set up the variables needed by the rest of the function from the | |
743 | new redirection. */ | |
744 | if (new_redirect->instruction == r_err_and_out) | |
745 | { | |
746 | char *alloca_hack; | |
747 | ||
748 | /* Copy the word without allocating any memory that must be | |
749 | explicitly freed. */ | |
750 | redirectee = (WORD_DESC *)alloca (sizeof (WORD_DESC)); | |
751 | xbcopy ((char *)new_redirect->redirectee.filename, | |
752 | (char *)redirectee, sizeof (WORD_DESC)); | |
753 | ||
754 | alloca_hack = (char *) | |
755 | alloca (1 + strlen (new_redirect->redirectee.filename->word)); | |
756 | redirectee->word = alloca_hack; | |
757 | strcpy (redirectee->word, new_redirect->redirectee.filename->word); | |
758 | } | |
759 | else | |
760 | /* It's guaranteed to be an integer, and shouldn't be freed. */ | |
761 | redirectee = new_redirect->redirectee.filename; | |
762 | ||
763 | redir_fd = new_redirect->redirectee.dest; | |
0001803f | 764 | redirector = new_redirect->redirector.dest; |
cce855bc JA |
765 | ri = new_redirect->instruction; |
766 | ||
767 | /* Overwrite the flags element of the old redirect with the new value. */ | |
768 | redirect->flags = new_redirect->flags; | |
769 | dispose_redirects (new_redirect); | |
770 | } | |
771 | ||
772 | switch (ri) | |
773 | { | |
774 | case r_output_direction: | |
775 | case r_appending_to: | |
776 | case r_input_direction: | |
777 | case r_inputa_direction: | |
778 | case r_err_and_out: /* command &>filename */ | |
3185942a | 779 | case r_append_err_and_out: /* command &>> filename */ |
cce855bc JA |
780 | case r_input_output: |
781 | case r_output_force: | |
bb70624e | 782 | if (posixly_correct && interactive_shell == 0) |
28ef6c31 JA |
783 | { |
784 | oflags = redirectee->flags; | |
785 | redirectee->flags |= W_NOGLOB; | |
786 | } | |
cce855bc | 787 | redirectee_word = redirection_expand (redirectee); |
bb70624e JA |
788 | if (posixly_correct && interactive_shell == 0) |
789 | redirectee->flags = oflags; | |
cce855bc JA |
790 | |
791 | if (redirectee_word == 0) | |
792 | return (AMBIGUOUS_REDIRECT); | |
793 | ||
794 | #if defined (RESTRICTED_SHELL) | |
795 | if (restricted && (WRITE_REDIRECT (ri))) | |
796 | { | |
797 | free (redirectee_word); | |
798 | return (RESTRICTED_REDIRECT); | |
799 | } | |
800 | #endif /* RESTRICTED_SHELL */ | |
801 | ||
bb70624e | 802 | fd = redir_open (redirectee_word, redirect->flags, 0666, ri); |
cce855bc JA |
803 | free (redirectee_word); |
804 | ||
bb70624e | 805 | if (fd == NOCLOBBER_REDIRECT) |
28ef6c31 | 806 | return (fd); |
bb70624e | 807 | |
cce855bc JA |
808 | if (fd < 0) |
809 | return (errno); | |
810 | ||
b80f6443 | 811 | if (flags & RX_ACTIVE) |
cce855bc | 812 | { |
0001803f | 813 | if (redirect->rflags & REDIR_VARASSIGN) |
495aee44 CR |
814 | { |
815 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
816 | r = errno; | |
817 | if (redirector < 0) | |
818 | sys_error (_("redirection error: cannot duplicate fd")); | |
819 | REDIRECTION_ERROR (redirector, r, fd); | |
820 | } | |
0001803f | 821 | |
b80f6443 | 822 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
823 | { |
824 | /* Only setup to undo it if the thing to undo is active. */ | |
825 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
495aee44 | 826 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 827 | else |
495aee44 CR |
828 | r = add_undo_close_redirect (redirector); |
829 | if (r < 0 && (redirect->rflags & REDIR_VARASSIGN)) | |
830 | close (redirector); | |
831 | REDIRECTION_ERROR (r, errno, fd); | |
f73dda09 | 832 | } |
cce855bc JA |
833 | |
834 | #if defined (BUFFERED_INPUT) | |
835 | check_bash_input (redirector); | |
836 | #endif | |
837 | ||
3185942a JA |
838 | /* Make sure there is no pending output before we change the state |
839 | of the underlying file descriptor, since the builtins use stdio | |
840 | for output. */ | |
841 | if (redirector == 1 && fileno (stdout) == redirector) | |
842 | { | |
843 | fflush (stdout); | |
844 | fpurge (stdout); | |
845 | } | |
846 | else if (redirector == 2 && fileno (stderr) == redirector) | |
847 | { | |
848 | fflush (stderr); | |
849 | fpurge (stderr); | |
850 | } | |
851 | ||
0001803f CR |
852 | if (redirect->rflags & REDIR_VARASSIGN) |
853 | { | |
854 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
855 | { | |
856 | close (redirector); | |
857 | close (fd); | |
858 | return (r); /* XXX */ | |
859 | } | |
860 | } | |
861 | else if ((fd != redirector) && (dup2 (fd, redirector) < 0)) | |
cce855bc JA |
862 | return (errno); |
863 | ||
864 | #if defined (BUFFERED_INPUT) | |
865 | /* Do not change the buffered stream for an implicit redirection | |
866 | of /dev/null to fd 0 for asynchronous commands without job | |
867 | control (r_inputa_direction). */ | |
868 | if (ri == r_input_direction || ri == r_input_output) | |
869 | duplicate_buffered_stream (fd, redirector); | |
870 | #endif /* BUFFERED_INPUT */ | |
871 | ||
872 | /* | |
873 | * If we're remembering, then this is the result of a while, for | |
874 | * or until loop with a loop redirection, or a function/builtin | |
875 | * executing in the parent shell with a redirection. In the | |
876 | * function/builtin case, we want to set all file descriptors > 2 | |
877 | * to be close-on-exec to duplicate the effect of the old | |
878 | * for i = 3 to NOFILE close(i) loop. In the case of the loops, | |
879 | * both sh and ksh leave the file descriptors open across execs. | |
880 | * The Posix standard mentions only the exec builtin. | |
881 | */ | |
b80f6443 | 882 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
883 | SET_CLOSE_ON_EXEC (redirector); |
884 | } | |
885 | ||
886 | if (fd != redirector) | |
887 | { | |
888 | #if defined (BUFFERED_INPUT) | |
889 | if (INPUT_REDIRECT (ri)) | |
890 | close_buffered_fd (fd); | |
891 | else | |
892 | #endif /* !BUFFERED_INPUT */ | |
893 | close (fd); /* Don't close what we just opened! */ | |
894 | } | |
895 | ||
896 | /* If we are hacking both stdout and stderr, do the stderr | |
0001803f | 897 | redirection here. XXX - handle {var} here? */ |
3185942a | 898 | if (ri == r_err_and_out || ri == r_append_err_and_out) |
cce855bc | 899 | { |
b80f6443 | 900 | if (flags & RX_ACTIVE) |
cce855bc | 901 | { |
b80f6443 | 902 | if (flags & RX_UNDOABLE) |
3185942a | 903 | add_undo_redirect (2, ri, -1); |
cce855bc JA |
904 | if (dup2 (1, 2) < 0) |
905 | return (errno); | |
906 | } | |
907 | } | |
908 | break; | |
909 | ||
910 | case r_reading_until: | |
911 | case r_deblank_reading_until: | |
7117c2d2 | 912 | case r_reading_string: |
cce855bc JA |
913 | /* REDIRECTEE is a pointer to a WORD_DESC containing the text of |
914 | the new input. Place it in a temporary file. */ | |
915 | if (redirectee) | |
916 | { | |
7117c2d2 | 917 | fd = here_document_to_fd (redirectee, ri); |
cce855bc JA |
918 | |
919 | if (fd < 0) | |
920 | { | |
921 | heredoc_errno = errno; | |
922 | return (HEREDOC_REDIRECT); | |
923 | } | |
924 | ||
0001803f | 925 | if (redirect->rflags & REDIR_VARASSIGN) |
495aee44 CR |
926 | { |
927 | redirector = fcntl (fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
928 | r = errno; | |
929 | if (redirector < 0) | |
930 | sys_error (_("redirection error: cannot duplicate fd")); | |
931 | REDIRECTION_ERROR (redirector, r, fd); | |
932 | } | |
0001803f | 933 | |
b80f6443 | 934 | if (flags & RX_ACTIVE) |
cce855bc | 935 | { |
b80f6443 | 936 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
937 | { |
938 | /* Only setup to undo it if the thing to undo is active. */ | |
939 | if ((fd != redirector) && (fcntl (redirector, F_GETFD, 0) != -1)) | |
495aee44 | 940 | r = add_undo_redirect (redirector, ri, -1); |
f73dda09 | 941 | else |
495aee44 CR |
942 | r = add_undo_close_redirect (redirector); |
943 | if (r < 0 && (redirect->rflags & REDIR_VARASSIGN)) | |
944 | close (redirector); | |
945 | REDIRECTION_ERROR (r, errno, fd); | |
f73dda09 | 946 | } |
cce855bc JA |
947 | |
948 | #if defined (BUFFERED_INPUT) | |
949 | check_bash_input (redirector); | |
950 | #endif | |
0001803f CR |
951 | if (redirect->rflags & REDIR_VARASSIGN) |
952 | { | |
953 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
954 | { | |
955 | close (redirector); | |
956 | close (fd); | |
957 | return (r); /* XXX */ | |
958 | } | |
959 | } | |
960 | else if (fd != redirector && dup2 (fd, redirector) < 0) | |
cce855bc JA |
961 | { |
962 | r = errno; | |
963 | close (fd); | |
964 | return (r); | |
965 | } | |
966 | ||
967 | #if defined (BUFFERED_INPUT) | |
968 | duplicate_buffered_stream (fd, redirector); | |
969 | #endif | |
970 | ||
b80f6443 | 971 | if ((flags & RX_CLEXEC) && (redirector > 2)) |
cce855bc JA |
972 | SET_CLOSE_ON_EXEC (redirector); |
973 | } | |
974 | ||
bb70624e | 975 | if (fd != redirector) |
cce855bc | 976 | #if defined (BUFFERED_INPUT) |
bb70624e | 977 | close_buffered_fd (fd); |
cce855bc | 978 | #else |
bb70624e | 979 | close (fd); |
cce855bc JA |
980 | #endif |
981 | } | |
982 | break; | |
983 | ||
984 | case r_duplicating_input: | |
985 | case r_duplicating_output: | |
7117c2d2 JA |
986 | case r_move_input: |
987 | case r_move_output: | |
0001803f | 988 | if ((flags & RX_ACTIVE) && (redirect->rflags & REDIR_VARASSIGN)) |
495aee44 CR |
989 | { |
990 | redirector = fcntl (redir_fd, F_DUPFD, SHELL_FD_BASE); /* XXX try this for now */ | |
991 | r = errno; | |
992 | if (redirector < 0) | |
993 | sys_error (_("redirection error: cannot duplicate fd")); | |
994 | REDIRECTION_ERROR (redirector, r, -1); | |
995 | } | |
0001803f | 996 | |
b80f6443 | 997 | if ((flags & RX_ACTIVE) && (redir_fd != redirector)) |
cce855bc | 998 | { |
b80f6443 | 999 | if (flags & RX_UNDOABLE) |
f73dda09 JA |
1000 | { |
1001 | /* Only setup to undo it if the thing to undo is active. */ | |
1002 | if (fcntl (redirector, F_GETFD, 0) != -1) | |
495aee44 | 1003 | r = add_undo_redirect (redirector, ri, redir_fd); |
f73dda09 | 1004 | else |
495aee44 CR |
1005 | r = add_undo_close_redirect (redirector); |
1006 | if (r < 0 && (redirect->rflags & REDIR_VARASSIGN)) | |
1007 | close (redirector); | |
1008 | REDIRECTION_ERROR (r, errno, -1); | |
f73dda09 | 1009 | } |
cce855bc JA |
1010 | #if defined (BUFFERED_INPUT) |
1011 | check_bash_input (redirector); | |
1012 | #endif | |
0001803f CR |
1013 | if (redirect->rflags & REDIR_VARASSIGN) |
1014 | { | |
1015 | if ((r = redir_varassign (redirect, redirector)) < 0) | |
1016 | { | |
1017 | close (redirector); | |
1018 | return (r); /* XXX */ | |
1019 | } | |
1020 | } | |
cce855bc | 1021 | /* This is correct. 2>&1 means dup2 (1, 2); */ |
0001803f | 1022 | else if (dup2 (redir_fd, redirector) < 0) |
cce855bc JA |
1023 | return (errno); |
1024 | ||
1025 | #if defined (BUFFERED_INPUT) | |
7117c2d2 | 1026 | if (ri == r_duplicating_input || ri == r_move_input) |
cce855bc JA |
1027 | duplicate_buffered_stream (redir_fd, redirector); |
1028 | #endif /* BUFFERED_INPUT */ | |
1029 | ||
1030 | /* First duplicate the close-on-exec state of redirectee. dup2 | |
1031 | leaves the flag unset on the new descriptor, which means it | |
1032 | stays open. Only set the close-on-exec bit for file descriptors | |
1033 | greater than 2 in any case, since 0-2 should always be open | |
95732b49 JA |
1034 | unless closed by something like `exec 2<&-'. It should always |
1035 | be safe to set fds > 2 to close-on-exec if they're being used to | |
1036 | save file descriptors < 2, since we don't need to preserve the | |
1037 | state of the close-on-exec flag for those fds -- they should | |
1038 | always be open. */ | |
cce855bc JA |
1039 | /* if ((already_set || set_unconditionally) && (ok_to_set)) |
1040 | set_it () */ | |
95732b49 JA |
1041 | #if 0 |
1042 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || redir_fd < 2 || (flags & RX_CLEXEC)) && | |
1043 | (redirector > 2)) | |
1044 | #else | |
1045 | if (((fcntl (redir_fd, F_GETFD, 0) == 1) || (redir_fd < 2 && (flags & RX_INTERNAL)) || (flags & RX_CLEXEC)) && | |
cce855bc | 1046 | (redirector > 2)) |
95732b49 | 1047 | #endif |
cce855bc | 1048 | SET_CLOSE_ON_EXEC (redirector); |
7117c2d2 | 1049 | |
3185942a JA |
1050 | /* When undoing saving of non-standard file descriptors (>=3) using |
1051 | file descriptors >= SHELL_FD_BASE, we set the saving fd to be | |
1052 | close-on-exec and use a flag to decide how to set close-on-exec | |
1053 | when the fd is restored. */ | |
1054 | if ((redirect->flags & RX_INTERNAL) && (redirect->flags & RX_SAVCLEXEC) && redirector >= 3 && redir_fd >= SHELL_FD_BASE) | |
1055 | SET_OPEN_ON_EXEC (redirector); | |
1056 | ||
7117c2d2 JA |
1057 | /* dup-and-close redirection */ |
1058 | if (ri == r_move_input || ri == r_move_output) | |
3185942a | 1059 | { |
0001803f CR |
1060 | xtrace_fdchk (redir_fd); |
1061 | ||
3185942a JA |
1062 | close (redir_fd); |
1063 | #if defined (COPROCESS_SUPPORT) | |
1064 | coproc_fdchk (redir_fd); /* XXX - loses coproc fds */ | |
1065 | #endif | |
1066 | } | |
cce855bc JA |
1067 | } |
1068 | break; | |
1069 | ||
1070 | case r_close_this: | |
b80f6443 | 1071 | if (flags & RX_ACTIVE) |
cce855bc | 1072 | { |
0001803f CR |
1073 | if (redirect->rflags & REDIR_VARASSIGN) |
1074 | { | |
1075 | redirector = redir_varvalue (redirect); | |
1076 | if (redirector < 0) | |
1077 | return AMBIGUOUS_REDIRECT; | |
1078 | } | |
1079 | ||
495aee44 | 1080 | r = 0; |
b80f6443 | 1081 | if ((flags & RX_UNDOABLE) && (fcntl (redirector, F_GETFD, 0) != -1)) |
495aee44 CR |
1082 | { |
1083 | r = add_undo_redirect (redirector, ri, -1); | |
1084 | REDIRECTION_ERROR (r, errno, redirector); | |
1085 | } | |
3185942a JA |
1086 | |
1087 | #if defined (COPROCESS_SUPPORT) | |
1088 | coproc_fdchk (redirector); | |
1089 | #endif | |
0001803f | 1090 | xtrace_fdchk (redirector); |
cce855bc JA |
1091 | |
1092 | #if defined (BUFFERED_INPUT) | |
1093 | check_bash_input (redirector); | |
774d3bf6 | 1094 | r = close_buffered_fd (redirector); |
cce855bc | 1095 | #else /* !BUFFERED_INPUT */ |
774d3bf6 | 1096 | r = close (redirector); |
cce855bc | 1097 | #endif /* !BUFFERED_INPUT */ |
774d3bf6 CR |
1098 | if (r < 0 && (flags & RX_INTERNAL) && (errno == EIO || errno == ENOSPC)) |
1099 | REDIRECTION_ERROR (r, errno, -1); | |
cce855bc JA |
1100 | } |
1101 | break; | |
1102 | ||
1103 | case r_duplicating_input_word: | |
1104 | case r_duplicating_output_word: | |
1105 | break; | |
1106 | } | |
1107 | return (0); | |
1108 | } | |
1109 | ||
cce855bc JA |
1110 | /* Remember the file descriptor associated with the slot FD, |
1111 | on REDIRECTION_UNDO_LIST. Note that the list will be reversed | |
1112 | before it is executed. Any redirections that need to be undone | |
1113 | even if REDIRECTION_UNDO_LIST is discarded by the exec builtin | |
3185942a JA |
1114 | are also saved on EXEC_REDIRECTION_UNDO_LIST. FDBASE says where to |
1115 | start the duplicating. If it's less than SHELL_FD_BASE, we're ok, | |
1116 | and can use SHELL_FD_BASE (-1 == don't care). If it's >= SHELL_FD_BASE, | |
1117 | we have to make sure we don't use fdbase to save a file descriptor, | |
1118 | since we're going to use it later (e.g., make sure we don't save fd 0 | |
1119 | to fd 10 if we have a redirection like 0<&10). If the value of fdbase | |
1120 | puts the process over its fd limit, causing fcntl to fail, we try | |
495aee44 | 1121 | again with SHELL_FD_BASE. Return 0 on success, -1 on error. */ |
cce855bc | 1122 | static int |
3185942a | 1123 | add_undo_redirect (fd, ri, fdbase) |
cce855bc | 1124 | int fd; |
0628567a | 1125 | enum r_instruction ri; |
3185942a | 1126 | int fdbase; |
cce855bc JA |
1127 | { |
1128 | int new_fd, clexec_flag; | |
1129 | REDIRECT *new_redirect, *closer, *dummy_redirect; | |
0001803f | 1130 | REDIRECTEE sd; |
cce855bc | 1131 | |
3185942a JA |
1132 | new_fd = fcntl (fd, F_DUPFD, (fdbase < SHELL_FD_BASE) ? SHELL_FD_BASE : fdbase+1); |
1133 | if (new_fd < 0) | |
1134 | new_fd = fcntl (fd, F_DUPFD, SHELL_FD_BASE); | |
cce855bc JA |
1135 | |
1136 | if (new_fd < 0) | |
1137 | { | |
b80f6443 | 1138 | sys_error (_("redirection error: cannot duplicate fd")); |
cce855bc JA |
1139 | return (-1); |
1140 | } | |
1141 | ||
1142 | clexec_flag = fcntl (fd, F_GETFD, 0); | |
1143 | ||
0001803f | 1144 | sd.dest = new_fd; |
f73dda09 | 1145 | rd.dest = 0; |
0001803f | 1146 | closer = make_redirection (sd, r_close_this, rd, 0); |
95732b49 | 1147 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1148 | dummy_redirect = copy_redirects (closer); |
1149 | ||
0001803f | 1150 | sd.dest = fd; |
f73dda09 | 1151 | rd.dest = new_fd; |
28ef6c31 | 1152 | if (fd == 0) |
0001803f | 1153 | new_redirect = make_redirection (sd, r_duplicating_input, rd, 0); |
28ef6c31 | 1154 | else |
0001803f | 1155 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
95732b49 | 1156 | new_redirect->flags |= RX_INTERNAL; |
3185942a JA |
1157 | if (clexec_flag == 0 && fd >= 3 && new_fd >= SHELL_FD_BASE) |
1158 | new_redirect->flags |= RX_SAVCLEXEC; | |
cce855bc JA |
1159 | new_redirect->next = closer; |
1160 | ||
1161 | closer->next = redirection_undo_list; | |
1162 | redirection_undo_list = new_redirect; | |
1163 | ||
1164 | /* Save redirections that need to be undone even if the undo list | |
1165 | is thrown away by the `exec' builtin. */ | |
1166 | add_exec_redirect (dummy_redirect); | |
1167 | ||
95732b49 JA |
1168 | /* experimental: if we're saving a redirection to undo for a file descriptor |
1169 | above SHELL_FD_BASE, add a redirection to be undone if the exec builtin | |
3185942a JA |
1170 | causes redirections to be discarded. There needs to be a difference |
1171 | between fds that are used to save other fds and then are the target of | |
495aee44 | 1172 | user redirections and fds that are just the target of user redirections. |
3185942a JA |
1173 | We use the close-on-exec flag to tell the difference; fds > SHELL_FD_BASE |
1174 | that have the close-on-exec flag set are assumed to be fds used internally | |
1175 | to save others. */ | |
1176 | if (fd >= SHELL_FD_BASE && ri != r_close_this && clexec_flag) | |
95732b49 | 1177 | { |
0001803f | 1178 | sd.dest = fd; |
95732b49 | 1179 | rd.dest = new_fd; |
0001803f | 1180 | new_redirect = make_redirection (sd, r_duplicating_output, rd, 0); |
3185942a JA |
1181 | new_redirect->flags |= RX_INTERNAL; |
1182 | ||
95732b49 | 1183 | add_exec_redirect (new_redirect); |
95732b49 JA |
1184 | } |
1185 | ||
cce855bc JA |
1186 | /* File descriptors used only for saving others should always be |
1187 | marked close-on-exec. Unfortunately, we have to preserve the | |
1188 | close-on-exec state of the file descriptor we are saving, since | |
1189 | fcntl (F_DUPFD) sets the new file descriptor to remain open | |
1190 | across execs. If, however, the file descriptor whose state we | |
1191 | are saving is <= 2, we can just set the close-on-exec flag, | |
1192 | because file descriptors 0-2 should always be open-on-exec, | |
1193 | and the restore above in do_redirection() will take care of it. */ | |
1194 | if (clexec_flag || fd < 3) | |
1195 | SET_CLOSE_ON_EXEC (new_fd); | |
3185942a JA |
1196 | else if (redirection_undo_list->flags & RX_SAVCLEXEC) |
1197 | SET_CLOSE_ON_EXEC (new_fd); | |
cce855bc JA |
1198 | |
1199 | return (0); | |
1200 | } | |
1201 | ||
1202 | /* Set up to close FD when we are finished with the current command | |
495aee44 CR |
1203 | and its redirections. Return 0 on success, -1 on error. */ |
1204 | static int | |
cce855bc JA |
1205 | add_undo_close_redirect (fd) |
1206 | int fd; | |
1207 | { | |
1208 | REDIRECT *closer; | |
0001803f | 1209 | REDIRECTEE sd; |
cce855bc | 1210 | |
0001803f | 1211 | sd.dest = fd; |
f73dda09 | 1212 | rd.dest = 0; |
0001803f | 1213 | closer = make_redirection (sd, r_close_this, rd, 0); |
95732b49 | 1214 | closer->flags |= RX_INTERNAL; |
cce855bc JA |
1215 | closer->next = redirection_undo_list; |
1216 | redirection_undo_list = closer; | |
495aee44 CR |
1217 | |
1218 | return 0; | |
cce855bc JA |
1219 | } |
1220 | ||
1221 | static void | |
1222 | add_exec_redirect (dummy_redirect) | |
1223 | REDIRECT *dummy_redirect; | |
1224 | { | |
1225 | dummy_redirect->next = exec_redirection_undo_list; | |
1226 | exec_redirection_undo_list = dummy_redirect; | |
1227 | } | |
1228 | ||
bb70624e JA |
1229 | /* Return 1 if the redirection specified by RI and REDIRECTOR alters the |
1230 | standard input. */ | |
1231 | static int | |
1232 | stdin_redirection (ri, redirector) | |
1233 | enum r_instruction ri; | |
1234 | int redirector; | |
1235 | { | |
1236 | switch (ri) | |
1237 | { | |
1238 | case r_input_direction: | |
1239 | case r_inputa_direction: | |
1240 | case r_input_output: | |
1241 | case r_reading_until: | |
1242 | case r_deblank_reading_until: | |
7117c2d2 | 1243 | case r_reading_string: |
bb70624e JA |
1244 | return (1); |
1245 | case r_duplicating_input: | |
1246 | case r_duplicating_input_word: | |
1247 | case r_close_this: | |
1248 | return (redirector == 0); | |
1249 | case r_output_direction: | |
1250 | case r_appending_to: | |
1251 | case r_duplicating_output: | |
1252 | case r_err_and_out: | |
3185942a | 1253 | case r_append_err_and_out: |
bb70624e JA |
1254 | case r_output_force: |
1255 | case r_duplicating_output_word: | |
1256 | return (0); | |
1257 | } | |
1258 | return (0); | |
1259 | } | |
1260 | ||
cce855bc JA |
1261 | /* Return non-zero if any of the redirections in REDIRS alter the standard |
1262 | input. */ | |
1263 | int | |
1264 | stdin_redirects (redirs) | |
1265 | REDIRECT *redirs; | |
1266 | { | |
1267 | REDIRECT *rp; | |
1268 | int n; | |
1269 | ||
1270 | for (n = 0, rp = redirs; rp; rp = rp->next) | |
0001803f CR |
1271 | if ((rp->rflags & REDIR_VARASSIGN) == 0) |
1272 | n += stdin_redirection (rp->instruction, rp->redirector.dest); | |
cce855bc JA |
1273 | return n; |
1274 | } | |
0001803f CR |
1275 | |
1276 | /* These don't yet handle array references */ | |
1277 | static int | |
1278 | redir_varassign (redir, fd) | |
1279 | REDIRECT *redir; | |
1280 | int fd; | |
1281 | { | |
1282 | WORD_DESC *w; | |
1283 | SHELL_VAR *v; | |
1284 | ||
1285 | w = redir->redirector.filename; | |
1286 | v = bind_var_to_int (w->word, fd); | |
1287 | if (v == 0 || readonly_p (v) || noassign_p (v)) | |
1288 | return BADVAR_REDIRECT; | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static int | |
1294 | redir_varvalue (redir) | |
1295 | REDIRECT *redir; | |
1296 | { | |
1297 | SHELL_VAR *v; | |
1298 | char *val; | |
1299 | intmax_t vmax; | |
1300 | int i; | |
1301 | ||
1302 | /* XXX - handle set -u here? */ | |
1303 | v = find_variable (redir->redirector.filename->word); | |
1304 | if (v == 0 || invisible_p (v)) | |
1305 | return -1; | |
1306 | ||
1307 | val = get_variable_value (v); | |
1308 | if (val == 0 || *val == 0) | |
1309 | return -1; | |
1310 | ||
1311 | if (legal_number (val, &vmax) < 0) | |
1312 | return -1; | |
1313 | ||
1314 | i = vmax; /* integer truncation */ | |
1315 | return i; | |
1316 | } |