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a0007dfa | 1 | /* Copyright (C) 2002, 2003, 2004, 2005 |
2 | Free Software Foundation, Inc. | |
4ee9c684 | 3 | Contributed by Andy Vaught |
4 | ||
5 | This file is part of the GNU Fortran 95 runtime library (libgfortran). | |
6 | ||
7 | Libgfortran 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 2, or (at your option) | |
10 | any later version. | |
11 | ||
b417ea8c | 12 | In addition to the permissions in the GNU General Public License, the |
13 | Free Software Foundation gives you unlimited permission to link the | |
14 | compiled version of this file into combinations with other programs, | |
15 | and to distribute those combinations without any restriction coming | |
16 | from the use of this file. (The General Public License restrictions | |
17 | do apply in other respects; for example, they cover modification of | |
18 | the file, and distribution when not linked into a combine | |
19 | executable.) | |
20 | ||
4ee9c684 | 21 | Libgfortran is distributed in the hope that it will be useful, |
22 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | GNU General Public License for more details. | |
25 | ||
26 | You should have received a copy of the GNU General Public License | |
27 | along with Libgfortran; see the file COPYING. If not, write to | |
5ac2525b | 28 | the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
29 | Boston, MA 02110-1301, USA. */ | |
4ee9c684 | 30 | |
31 | /* Unix stream I/O module */ | |
32 | ||
33 | #include "config.h" | |
34 | #include <stdlib.h> | |
35 | #include <limits.h> | |
36 | ||
37 | #include <unistd.h> | |
91e6f54a | 38 | #include <stdio.h> |
4ee9c684 | 39 | #include <sys/stat.h> |
40 | #include <fcntl.h> | |
2639e4cd | 41 | #include <assert.h> |
4ee9c684 | 42 | |
4ee9c684 | 43 | #include <string.h> |
44 | #include <errno.h> | |
45 | ||
46 | #include "libgfortran.h" | |
47 | #include "io.h" | |
60c514ba | 48 | #include "unix.h" |
4ee9c684 | 49 | |
8df8ec57 | 50 | #ifndef SSIZE_MAX |
51 | #define SSIZE_MAX SHRT_MAX | |
52 | #endif | |
53 | ||
4ee9c684 | 54 | #ifndef PATH_MAX |
55 | #define PATH_MAX 1024 | |
56 | #endif | |
57 | ||
d2455565 | 58 | #ifndef PROT_READ |
59 | #define PROT_READ 1 | |
60 | #endif | |
61 | ||
62 | #ifndef PROT_WRITE | |
63 | #define PROT_WRITE 2 | |
64 | #endif | |
65 | ||
7dfba97b | 66 | /* These flags aren't defined on all targets (mingw32), so provide them |
67 | here. */ | |
68 | #ifndef S_IRGRP | |
69 | #define S_IRGRP 0 | |
70 | #endif | |
71 | ||
72 | #ifndef S_IWGRP | |
73 | #define S_IWGRP 0 | |
74 | #endif | |
75 | ||
76 | #ifndef S_IROTH | |
77 | #define S_IROTH 0 | |
78 | #endif | |
79 | ||
80 | #ifndef S_IWOTH | |
81 | #define S_IWOTH 0 | |
82 | #endif | |
83 | ||
4ee9c684 | 84 | /* This implementation of stream I/O is based on the paper: |
85 | * | |
86 | * "Exploiting the advantages of mapped files for stream I/O", | |
87 | * O. Krieger, M. Stumm and R. Umrau, "Proceedings of the 1992 Winter | |
88 | * USENIX conference", p. 27-42. | |
89 | * | |
90 | * It differs in a number of ways from the version described in the | |
91 | * paper. First of all, threads are not an issue during I/O and we | |
92 | * also don't have to worry about having multiple regions, since | |
93 | * fortran's I/O model only allows you to be one place at a time. | |
94 | * | |
95 | * On the other hand, we have to be able to writing at the end of a | |
96 | * stream, read from the start of a stream or read and write blocks of | |
97 | * bytes from an arbitrary position. After opening a file, a pointer | |
98 | * to a stream structure is returned, which is used to handle file | |
99 | * accesses until the file is closed. | |
100 | * | |
101 | * salloc_at_r(stream, len, where)-- Given a stream pointer, return a | |
102 | * pointer to a block of memory that mirror the file at position | |
103 | * 'where' that is 'len' bytes long. The len integer is updated to | |
104 | * reflect how many bytes were actually read. The only reason for a | |
105 | * short read is end of file. The file pointer is updated. The | |
106 | * pointer is valid until the next call to salloc_*. | |
107 | * | |
108 | * salloc_at_w(stream, len, where)-- Given the stream pointer, returns | |
109 | * a pointer to a block of memory that is updated to reflect the state | |
110 | * of the file. The length of the buffer is always equal to that | |
111 | * requested. The buffer must be completely set by the caller. When | |
112 | * data has been written, the sfree() function must be called to | |
113 | * indicate that the caller is done writing data to the buffer. This | |
114 | * may or may not cause a physical write. | |
115 | * | |
116 | * Short forms of these are salloc_r() and salloc_w() which drop the | |
117 | * 'where' parameter and use the current file pointer. */ | |
118 | ||
119 | ||
4ee9c684 | 120 | /*move_pos_offset()-- Move the record pointer right or left |
121 | *relative to current position */ | |
122 | ||
123 | int | |
124 | move_pos_offset (stream* st, int pos_off) | |
125 | { | |
126 | unix_stream * str = (unix_stream*)st; | |
127 | if (pos_off < 0) | |
128 | { | |
363dcb81 | 129 | str->logical_offset += pos_off; |
4ee9c684 | 130 | |
363dcb81 | 131 | if (str->dirty_offset + str->ndirty > str->logical_offset) |
4ee9c684 | 132 | { |
363dcb81 | 133 | if (str->ndirty + pos_off > 0) |
134 | str->ndirty += pos_off; | |
4ee9c684 | 135 | else |
136 | { | |
137 | str->dirty_offset += pos_off + pos_off; | |
363dcb81 | 138 | str->ndirty = 0; |
4ee9c684 | 139 | } |
140 | } | |
141 | ||
363dcb81 | 142 | return pos_off; |
4ee9c684 | 143 | } |
363dcb81 | 144 | return 0; |
4ee9c684 | 145 | } |
146 | ||
147 | ||
148 | /* fix_fd()-- Given a file descriptor, make sure it is not one of the | |
149 | * standard descriptors, returning a non-standard descriptor. If the | |
150 | * user specifies that system errors should go to standard output, | |
151 | * then closes standard output, we don't want the system errors to a | |
152 | * file that has been given file descriptor 1 or 0. We want to send | |
153 | * the error to the invalid descriptor. */ | |
154 | ||
155 | static int | |
156 | fix_fd (int fd) | |
157 | { | |
158 | int input, output, error; | |
159 | ||
160 | input = output = error = 0; | |
161 | ||
7145fd06 | 162 | /* Unix allocates the lowest descriptors first, so a loop is not |
163 | required, but this order is. */ | |
4ee9c684 | 164 | |
165 | if (fd == STDIN_FILENO) | |
166 | { | |
167 | fd = dup (fd); | |
168 | input = 1; | |
169 | } | |
170 | if (fd == STDOUT_FILENO) | |
171 | { | |
172 | fd = dup (fd); | |
173 | output = 1; | |
174 | } | |
175 | if (fd == STDERR_FILENO) | |
176 | { | |
177 | fd = dup (fd); | |
178 | error = 1; | |
179 | } | |
180 | ||
181 | if (input) | |
182 | close (STDIN_FILENO); | |
183 | if (output) | |
184 | close (STDOUT_FILENO); | |
185 | if (error) | |
186 | close (STDERR_FILENO); | |
187 | ||
188 | return fd; | |
189 | } | |
190 | ||
353c8a95 | 191 | int |
192 | is_preconnected (stream * s) | |
193 | { | |
194 | int fd; | |
195 | ||
196 | fd = ((unix_stream *) s)->fd; | |
197 | if (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO) | |
198 | return 1; | |
199 | else | |
200 | return 0; | |
201 | } | |
4ee9c684 | 202 | |
2488b3b6 | 203 | /* If the stream corresponds to a preconnected unit, we flush the |
204 | corresponding C stream. This is bugware for mixed C-Fortran codes | |
205 | where the C code doesn't flush I/O before returning. */ | |
206 | void | |
207 | flush_if_preconnected (stream * s) | |
208 | { | |
209 | int fd; | |
210 | ||
211 | fd = ((unix_stream *) s)->fd; | |
212 | if (fd == STDIN_FILENO) | |
213 | fflush (stdin); | |
214 | else if (fd == STDOUT_FILENO) | |
215 | fflush (stdout); | |
216 | else if (fd == STDERR_FILENO) | |
217 | fflush (stderr); | |
218 | } | |
219 | ||
4ee9c684 | 220 | |
b2a112ca | 221 | /* Reset a stream after reading/writing. Assumes that the buffers have |
222 | been flushed. */ | |
223 | ||
224 | inline static void | |
225 | reset_stream (unix_stream * s, size_t bytes_rw) | |
4ee9c684 | 226 | { |
b2a112ca | 227 | s->physical_offset += bytes_rw; |
228 | s->logical_offset = s->physical_offset; | |
229 | if (s->file_length != -1 && s->physical_offset > s->file_length) | |
230 | s->file_length = s->physical_offset; | |
231 | } | |
4ee9c684 | 232 | |
4ee9c684 | 233 | |
b2a112ca | 234 | /* Read bytes into a buffer, allowing for short reads. If the nbytes |
235 | * argument is less on return than on entry, it is because we've hit | |
236 | * the end of file. */ | |
4ee9c684 | 237 | |
b2a112ca | 238 | static int |
239 | do_read (unix_stream * s, void * buf, size_t * nbytes) | |
240 | { | |
241 | ssize_t trans; | |
242 | size_t bytes_left; | |
243 | char *buf_st; | |
244 | int status; | |
245 | ||
246 | status = 0; | |
247 | bytes_left = *nbytes; | |
248 | buf_st = (char *) buf; | |
249 | ||
250 | /* We must read in a loop since some systems don't restart system | |
251 | calls in case of a signal. */ | |
252 | while (bytes_left > 0) | |
253 | { | |
254 | /* Requests between SSIZE_MAX and SIZE_MAX are undefined by SUSv3, | |
255 | so we must read in chunks smaller than SSIZE_MAX. */ | |
256 | trans = (bytes_left < SSIZE_MAX) ? bytes_left : SSIZE_MAX; | |
257 | trans = read (s->fd, buf_st, trans); | |
258 | if (trans < 0) | |
259 | { | |
260 | if (errno == EINTR) | |
261 | continue; | |
262 | else | |
263 | { | |
264 | status = errno; | |
265 | break; | |
266 | } | |
267 | } | |
268 | else if (trans == 0) /* We hit EOF. */ | |
269 | break; | |
270 | buf_st += trans; | |
271 | bytes_left -= trans; | |
4ee9c684 | 272 | } |
273 | ||
b2a112ca | 274 | *nbytes -= bytes_left; |
275 | return status; | |
4ee9c684 | 276 | } |
277 | ||
278 | ||
b2a112ca | 279 | /* Write a buffer to a stream, allowing for short writes. */ |
4ee9c684 | 280 | |
281 | static int | |
b2a112ca | 282 | do_write (unix_stream * s, const void * buf, size_t * nbytes) |
4ee9c684 | 283 | { |
b2a112ca | 284 | ssize_t trans; |
285 | size_t bytes_left; | |
286 | char *buf_st; | |
287 | int status; | |
288 | ||
289 | status = 0; | |
290 | bytes_left = *nbytes; | |
291 | buf_st = (char *) buf; | |
292 | ||
293 | /* We must write in a loop since some systems don't restart system | |
294 | calls in case of a signal. */ | |
295 | while (bytes_left > 0) | |
4ee9c684 | 296 | { |
b2a112ca | 297 | /* Requests between SSIZE_MAX and SIZE_MAX are undefined by SUSv3, |
298 | so we must write in chunks smaller than SSIZE_MAX. */ | |
299 | trans = (bytes_left < SSIZE_MAX) ? bytes_left : SSIZE_MAX; | |
300 | trans = write (s->fd, buf_st, trans); | |
301 | if (trans < 0) | |
302 | { | |
303 | if (errno == EINTR) | |
304 | continue; | |
305 | else | |
306 | { | |
307 | status = errno; | |
308 | break; | |
309 | } | |
310 | } | |
311 | buf_st += trans; | |
312 | bytes_left -= trans; | |
4ee9c684 | 313 | } |
314 | ||
b2a112ca | 315 | *nbytes -= bytes_left; |
316 | return status; | |
4ee9c684 | 317 | } |
4ee9c684 | 318 | |
319 | ||
320 | /* get_oserror()-- Get the most recent operating system error. For | |
321 | * unix, this is errno. */ | |
322 | ||
323 | const char * | |
324 | get_oserror (void) | |
325 | { | |
4ee9c684 | 326 | return strerror (errno); |
327 | } | |
328 | ||
329 | ||
330 | /* sys_exit()-- Terminate the program with an exit code */ | |
331 | ||
332 | void | |
333 | sys_exit (int code) | |
334 | { | |
4ee9c684 | 335 | exit (code); |
336 | } | |
337 | ||
338 | ||
4ee9c684 | 339 | /********************************************************************* |
340 | File descriptor stream functions | |
341 | *********************************************************************/ | |
342 | ||
b2a112ca | 343 | |
4ee9c684 | 344 | /* fd_flush()-- Write bytes that need to be written */ |
345 | ||
346 | static try | |
347 | fd_flush (unix_stream * s) | |
348 | { | |
b2a112ca | 349 | size_t writelen; |
350 | ||
4ee9c684 | 351 | if (s->ndirty == 0) |
352 | return SUCCESS;; | |
353 | ||
354 | if (s->physical_offset != s->dirty_offset && | |
355 | lseek (s->fd, s->dirty_offset, SEEK_SET) < 0) | |
356 | return FAILURE; | |
357 | ||
b2a112ca | 358 | writelen = s->ndirty; |
359 | if (do_write (s, s->buffer + (s->dirty_offset - s->buffer_offset), | |
360 | &writelen) != 0) | |
4ee9c684 | 361 | return FAILURE; |
362 | ||
b2a112ca | 363 | s->physical_offset = s->dirty_offset + writelen; |
5a78b88f | 364 | |
365 | /* don't increment file_length if the file is non-seekable */ | |
366 | if (s->file_length != -1 && s->physical_offset > s->file_length) | |
b2a112ca | 367 | s->file_length = s->physical_offset; |
368 | ||
369 | s->ndirty -= writelen; | |
370 | if (s->ndirty != 0) | |
371 | return FAILURE; | |
4ee9c684 | 372 | |
373 | return SUCCESS; | |
374 | } | |
375 | ||
376 | ||
377 | /* fd_alloc()-- Arrange a buffer such that the salloc() request can be | |
378 | * satisfied. This subroutine gets the buffer ready for whatever is | |
379 | * to come next. */ | |
380 | ||
381 | static void | |
a0007dfa | 382 | fd_alloc (unix_stream * s, gfc_offset where, |
383 | int *len __attribute__ ((unused))) | |
4ee9c684 | 384 | { |
385 | char *new_buffer; | |
386 | int n, read_len; | |
387 | ||
388 | if (*len <= BUFFER_SIZE) | |
389 | { | |
390 | new_buffer = s->small_buffer; | |
391 | read_len = BUFFER_SIZE; | |
392 | } | |
393 | else | |
394 | { | |
395 | new_buffer = get_mem (*len); | |
396 | read_len = *len; | |
397 | } | |
398 | ||
399 | /* Salvage bytes currently within the buffer. This is important for | |
400 | * devices that cannot seek. */ | |
401 | ||
402 | if (s->buffer != NULL && s->buffer_offset <= where && | |
403 | where <= s->buffer_offset + s->active) | |
404 | { | |
405 | ||
406 | n = s->active - (where - s->buffer_offset); | |
407 | memmove (new_buffer, s->buffer + (where - s->buffer_offset), n); | |
408 | ||
409 | s->active = n; | |
410 | } | |
411 | else | |
412 | { /* new buffer starts off empty */ | |
413 | s->active = 0; | |
414 | } | |
415 | ||
416 | s->buffer_offset = where; | |
417 | ||
418 | /* free the old buffer if necessary */ | |
419 | ||
420 | if (s->buffer != NULL && s->buffer != s->small_buffer) | |
421 | free_mem (s->buffer); | |
422 | ||
423 | s->buffer = new_buffer; | |
424 | s->len = read_len; | |
4ee9c684 | 425 | } |
426 | ||
427 | ||
428 | /* fd_alloc_r_at()-- Allocate a stream buffer for reading. Either | |
429 | * we've already buffered the data or we need to load it. Returns | |
430 | * NULL on I/O error. */ | |
431 | ||
432 | static char * | |
b093181d | 433 | fd_alloc_r_at (unix_stream * s, int *len, gfc_offset where) |
4ee9c684 | 434 | { |
b093181d | 435 | gfc_offset m; |
4ee9c684 | 436 | |
437 | if (where == -1) | |
438 | where = s->logical_offset; | |
439 | ||
440 | if (s->buffer != NULL && s->buffer_offset <= where && | |
441 | where + *len <= s->buffer_offset + s->active) | |
442 | { | |
443 | ||
444 | /* Return a position within the current buffer */ | |
445 | ||
446 | s->logical_offset = where + *len; | |
447 | return s->buffer + where - s->buffer_offset; | |
448 | } | |
449 | ||
450 | fd_alloc (s, where, len); | |
451 | ||
452 | m = where + s->active; | |
453 | ||
454 | if (s->physical_offset != m && lseek (s->fd, m, SEEK_SET) < 0) | |
455 | return NULL; | |
456 | ||
fef3501c | 457 | /* do_read() hangs on read from terminals for *BSD-systems. Only |
458 | use read() in that case. */ | |
459 | ||
460 | if (s->special_file) | |
461 | { | |
462 | ssize_t n; | |
463 | ||
464 | n = read (s->fd, s->buffer + s->active, s->len - s->active); | |
465 | if (n < 0) | |
466 | return NULL; | |
467 | ||
468 | s->physical_offset = where + n; | |
469 | s->active += n; | |
470 | } | |
471 | else | |
472 | { | |
473 | size_t n; | |
4ee9c684 | 474 | |
fef3501c | 475 | n = s->len - s->active; |
476 | if (do_read (s, s->buffer + s->active, &n) != 0) | |
477 | return NULL; | |
478 | ||
479 | s->physical_offset = where + n; | |
480 | s->active += n; | |
481 | } | |
4ee9c684 | 482 | |
4ee9c684 | 483 | if (s->active < *len) |
484 | *len = s->active; /* Bytes actually available */ | |
485 | ||
486 | s->logical_offset = where + *len; | |
487 | ||
488 | return s->buffer; | |
489 | } | |
490 | ||
491 | ||
492 | /* fd_alloc_w_at()-- Allocate a stream buffer for writing. Either | |
493 | * we've already buffered the data or we need to load it. */ | |
494 | ||
495 | static char * | |
b093181d | 496 | fd_alloc_w_at (unix_stream * s, int *len, gfc_offset where) |
4ee9c684 | 497 | { |
b093181d | 498 | gfc_offset n; |
4ee9c684 | 499 | |
500 | if (where == -1) | |
501 | where = s->logical_offset; | |
502 | ||
503 | if (s->buffer == NULL || s->buffer_offset > where || | |
504 | where + *len > s->buffer_offset + s->len) | |
505 | { | |
506 | ||
507 | if (fd_flush (s) == FAILURE) | |
508 | return NULL; | |
509 | fd_alloc (s, where, len); | |
510 | } | |
511 | ||
512 | /* Return a position within the current buffer */ | |
5a78b88f | 513 | if (s->ndirty == 0 |
514 | || where > s->dirty_offset + s->ndirty | |
515 | || s->dirty_offset > where + *len) | |
516 | { /* Discontiguous blocks, start with a clean buffer. */ | |
517 | /* Flush the buffer. */ | |
518 | if (s->ndirty != 0) | |
519 | fd_flush (s); | |
520 | s->dirty_offset = where; | |
521 | s->ndirty = *len; | |
4ee9c684 | 522 | } |
523 | else | |
5a78b88f | 524 | { |
525 | gfc_offset start; /* Merge with the existing data. */ | |
526 | if (where < s->dirty_offset) | |
527 | start = where; | |
528 | else | |
529 | start = s->dirty_offset; | |
530 | if (where + *len > s->dirty_offset + s->ndirty) | |
531 | s->ndirty = where + *len - start; | |
532 | else | |
533 | s->ndirty = s->dirty_offset + s->ndirty - start; | |
534 | s->dirty_offset = start; | |
4ee9c684 | 535 | } |
536 | ||
537 | s->logical_offset = where + *len; | |
538 | ||
f82543e7 | 539 | if (where + *len > s->file_length) |
540 | s->file_length = where + *len; | |
541 | ||
4ee9c684 | 542 | n = s->logical_offset - s->buffer_offset; |
543 | if (n > s->active) | |
544 | s->active = n; | |
545 | ||
546 | return s->buffer + where - s->buffer_offset; | |
547 | } | |
548 | ||
549 | ||
550 | static try | |
551 | fd_sfree (unix_stream * s) | |
552 | { | |
4ee9c684 | 553 | if (s->ndirty != 0 && |
554 | (s->buffer != s->small_buffer || options.all_unbuffered || | |
555 | s->unbuffered)) | |
556 | return fd_flush (s); | |
557 | ||
558 | return SUCCESS; | |
559 | } | |
560 | ||
561 | ||
b2a112ca | 562 | static try |
b093181d | 563 | fd_seek (unix_stream * s, gfc_offset offset) |
4ee9c684 | 564 | { |
b3ac1032 | 565 | if (s->physical_offset == offset) /* Are we lucky and avoid syscall? */ |
566 | { | |
567 | s->logical_offset = offset; | |
568 | return SUCCESS; | |
569 | } | |
4ee9c684 | 570 | |
b3ac1032 | 571 | s->physical_offset = s->logical_offset = offset; |
25545daf | 572 | s->active = 0; |
b3ac1032 | 573 | |
574 | return (lseek (s->fd, offset, SEEK_SET) < 0) ? FAILURE : SUCCESS; | |
4ee9c684 | 575 | } |
576 | ||
577 | ||
578 | /* truncate_file()-- Given a unit, truncate the file at the current | |
579 | * position. Sets the physical location to the new end of the file. | |
580 | * Returns nonzero on error. */ | |
581 | ||
582 | static try | |
583 | fd_truncate (unix_stream * s) | |
584 | { | |
5a78b88f | 585 | if (lseek (s->fd, s->logical_offset, SEEK_SET) == -1) |
4ee9c684 | 586 | return FAILURE; |
587 | ||
5a78b88f | 588 | /* non-seekable files, like terminals and fifo's fail the lseek. |
227e9423 | 589 | Using ftruncate on a seekable special file (like /dev/null) |
1c201879 | 590 | is undefined, so we treat it as if the ftruncate succeeded. |
227e9423 | 591 | */ |
a54b1ce7 | 592 | #ifdef HAVE_FTRUNCATE |
227e9423 | 593 | if (s->special_file || ftruncate (s->fd, s->logical_offset)) |
a54b1ce7 | 594 | #else |
595 | #ifdef HAVE_CHSIZE | |
227e9423 | 596 | if (s->special_file || chsize (s->fd, s->logical_offset)) |
a54b1ce7 | 597 | #endif |
598 | #endif | |
72909c79 | 599 | { |
600 | s->physical_offset = s->file_length = 0; | |
1c201879 | 601 | return SUCCESS; |
72909c79 | 602 | } |
5a78b88f | 603 | |
604 | s->physical_offset = s->file_length = s->logical_offset; | |
8c39329b | 605 | s->active = 0; |
4ee9c684 | 606 | return SUCCESS; |
607 | } | |
608 | ||
609 | ||
56f281a2 | 610 | /* Similar to memset(), but operating on a stream instead of a string. |
611 | Takes care of not using too much memory. */ | |
612 | ||
613 | static try | |
614 | fd_sset (unix_stream * s, int c, size_t n) | |
615 | { | |
616 | size_t bytes_left; | |
617 | int trans; | |
618 | void *p; | |
619 | ||
620 | bytes_left = n; | |
621 | ||
622 | while (bytes_left > 0) | |
623 | { | |
624 | /* memset() in chunks of BUFFER_SIZE. */ | |
625 | trans = (bytes_left < BUFFER_SIZE) ? bytes_left : BUFFER_SIZE; | |
626 | ||
627 | p = fd_alloc_w_at (s, &trans, -1); | |
628 | if (p) | |
629 | memset (p, c, trans); | |
630 | else | |
631 | return FAILURE; | |
632 | ||
633 | bytes_left -= trans; | |
634 | } | |
635 | ||
636 | return SUCCESS; | |
637 | } | |
b2a112ca | 638 | |
639 | ||
640 | /* Stream read function. Avoids using a buffer for big reads. The | |
641 | interface is like POSIX read(), but the nbytes argument is a | |
642 | pointer; on return it contains the number of bytes written. The | |
643 | function return value is the status indicator (0 for success). */ | |
644 | ||
645 | static int | |
646 | fd_read (unix_stream * s, void * buf, size_t * nbytes) | |
647 | { | |
648 | void *p; | |
649 | int tmp, status; | |
650 | ||
651 | if (*nbytes < BUFFER_SIZE && !s->unbuffered) | |
652 | { | |
653 | tmp = *nbytes; | |
654 | p = fd_alloc_r_at (s, &tmp, -1); | |
655 | if (p) | |
656 | { | |
657 | *nbytes = tmp; | |
658 | memcpy (buf, p, *nbytes); | |
659 | return 0; | |
660 | } | |
661 | else | |
662 | { | |
663 | *nbytes = 0; | |
664 | return errno; | |
665 | } | |
666 | } | |
667 | ||
668 | /* If the request is bigger than BUFFER_SIZE we flush the buffers | |
669 | and read directly. */ | |
670 | if (fd_flush (s) == FAILURE) | |
671 | { | |
672 | *nbytes = 0; | |
673 | return errno; | |
674 | } | |
675 | ||
b3ac1032 | 676 | if (is_seekable ((stream *) s) && fd_seek (s, s->logical_offset) == FAILURE) |
b2a112ca | 677 | { |
678 | *nbytes = 0; | |
679 | return errno; | |
680 | } | |
681 | ||
682 | status = do_read (s, buf, nbytes); | |
683 | reset_stream (s, *nbytes); | |
684 | return status; | |
685 | } | |
686 | ||
687 | ||
688 | /* Stream write function. Avoids using a buffer for big writes. The | |
689 | interface is like POSIX write(), but the nbytes argument is a | |
690 | pointer; on return it contains the number of bytes written. The | |
691 | function return value is the status indicator (0 for success). */ | |
692 | ||
693 | static int | |
694 | fd_write (unix_stream * s, const void * buf, size_t * nbytes) | |
695 | { | |
696 | void *p; | |
697 | int tmp, status; | |
698 | ||
699 | if (*nbytes < BUFFER_SIZE && !s->unbuffered) | |
700 | { | |
701 | tmp = *nbytes; | |
702 | p = fd_alloc_w_at (s, &tmp, -1); | |
703 | if (p) | |
704 | { | |
705 | *nbytes = tmp; | |
706 | memcpy (p, buf, *nbytes); | |
707 | return 0; | |
708 | } | |
709 | else | |
710 | { | |
711 | *nbytes = 0; | |
712 | return errno; | |
713 | } | |
714 | } | |
715 | ||
716 | /* If the request is bigger than BUFFER_SIZE we flush the buffers | |
717 | and write directly. */ | |
718 | if (fd_flush (s) == FAILURE) | |
719 | { | |
720 | *nbytes = 0; | |
721 | return errno; | |
722 | } | |
723 | ||
b3ac1032 | 724 | if (is_seekable ((stream *) s) && fd_seek (s, s->logical_offset) == FAILURE) |
b2a112ca | 725 | { |
726 | *nbytes = 0; | |
727 | return errno; | |
728 | } | |
729 | ||
730 | status = do_write (s, buf, nbytes); | |
731 | reset_stream (s, *nbytes); | |
732 | return status; | |
733 | } | |
734 | ||
735 | ||
4ee9c684 | 736 | static try |
737 | fd_close (unix_stream * s) | |
738 | { | |
4ee9c684 | 739 | if (fd_flush (s) == FAILURE) |
740 | return FAILURE; | |
741 | ||
742 | if (s->buffer != NULL && s->buffer != s->small_buffer) | |
743 | free_mem (s->buffer); | |
744 | ||
f8f6940b | 745 | if (s->fd != STDOUT_FILENO && s->fd != STDERR_FILENO) |
746 | { | |
747 | if (close (s->fd) < 0) | |
748 | return FAILURE; | |
749 | } | |
4ee9c684 | 750 | |
751 | free_mem (s); | |
752 | ||
753 | return SUCCESS; | |
754 | } | |
755 | ||
756 | ||
757 | static void | |
758 | fd_open (unix_stream * s) | |
759 | { | |
4ee9c684 | 760 | if (isatty (s->fd)) |
761 | s->unbuffered = 1; | |
762 | ||
763 | s->st.alloc_r_at = (void *) fd_alloc_r_at; | |
764 | s->st.alloc_w_at = (void *) fd_alloc_w_at; | |
765 | s->st.sfree = (void *) fd_sfree; | |
766 | s->st.close = (void *) fd_close; | |
767 | s->st.seek = (void *) fd_seek; | |
768 | s->st.truncate = (void *) fd_truncate; | |
b2a112ca | 769 | s->st.read = (void *) fd_read; |
770 | s->st.write = (void *) fd_write; | |
56f281a2 | 771 | s->st.set = (void *) fd_sset; |
4ee9c684 | 772 | |
773 | s->buffer = NULL; | |
774 | } | |
775 | ||
776 | ||
4ee9c684 | 777 | |
b2a112ca | 778 | |
4ee9c684 | 779 | /********************************************************************* |
780 | memory stream functions - These are used for internal files | |
781 | ||
782 | The idea here is that a single stream structure is created and all | |
783 | requests must be satisfied from it. The location and size of the | |
784 | buffer is the character variable supplied to the READ or WRITE | |
785 | statement. | |
786 | ||
787 | *********************************************************************/ | |
788 | ||
789 | ||
790 | static char * | |
b093181d | 791 | mem_alloc_r_at (unix_stream * s, int *len, gfc_offset where) |
4ee9c684 | 792 | { |
b093181d | 793 | gfc_offset n; |
4ee9c684 | 794 | |
795 | if (where == -1) | |
796 | where = s->logical_offset; | |
797 | ||
798 | if (where < s->buffer_offset || where > s->buffer_offset + s->active) | |
799 | return NULL; | |
800 | ||
4ee9c684 | 801 | s->logical_offset = where + *len; |
802 | ||
11de4bf9 | 803 | n = s->buffer_offset + s->active - where; |
4ee9c684 | 804 | if (*len > n) |
805 | *len = n; | |
806 | ||
807 | return s->buffer + (where - s->buffer_offset); | |
808 | } | |
809 | ||
810 | ||
811 | static char * | |
b093181d | 812 | mem_alloc_w_at (unix_stream * s, int *len, gfc_offset where) |
4ee9c684 | 813 | { |
b093181d | 814 | gfc_offset m; |
4ee9c684 | 815 | |
2639e4cd | 816 | assert (*len >= 0); /* Negative values not allowed. */ |
817 | ||
4ee9c684 | 818 | if (where == -1) |
819 | where = s->logical_offset; | |
820 | ||
821 | m = where + *len; | |
822 | ||
2639e4cd | 823 | if (where < s->buffer_offset) |
4ee9c684 | 824 | return NULL; |
825 | ||
2639e4cd | 826 | if (m > s->file_length) |
72231bd6 | 827 | return NULL; |
2639e4cd | 828 | |
4ee9c684 | 829 | s->logical_offset = m; |
830 | ||
831 | return s->buffer + (where - s->buffer_offset); | |
832 | } | |
833 | ||
834 | ||
b2a112ca | 835 | /* Stream read function for internal units. This is not actually used |
836 | at the moment, as all internal IO is formatted and the formatted IO | |
837 | routines use mem_alloc_r_at. */ | |
838 | ||
839 | static int | |
840 | mem_read (unix_stream * s, void * buf, size_t * nbytes) | |
841 | { | |
842 | void *p; | |
843 | int tmp; | |
844 | ||
845 | tmp = *nbytes; | |
846 | p = mem_alloc_r_at (s, &tmp, -1); | |
847 | if (p) | |
848 | { | |
849 | *nbytes = tmp; | |
850 | memcpy (buf, p, *nbytes); | |
851 | return 0; | |
852 | } | |
853 | else | |
854 | { | |
855 | *nbytes = 0; | |
856 | return errno; | |
857 | } | |
858 | } | |
859 | ||
860 | ||
861 | /* Stream write function for internal units. This is not actually used | |
862 | at the moment, as all internal IO is formatted and the formatted IO | |
863 | routines use mem_alloc_w_at. */ | |
864 | ||
865 | static int | |
866 | mem_write (unix_stream * s, const void * buf, size_t * nbytes) | |
867 | { | |
868 | void *p; | |
869 | int tmp; | |
870 | ||
871 | errno = 0; | |
872 | ||
873 | tmp = *nbytes; | |
874 | p = mem_alloc_w_at (s, &tmp, -1); | |
875 | if (p) | |
876 | { | |
877 | *nbytes = tmp; | |
878 | memcpy (p, buf, *nbytes); | |
879 | return 0; | |
880 | } | |
881 | else | |
882 | { | |
883 | *nbytes = 0; | |
884 | return errno; | |
885 | } | |
886 | } | |
887 | ||
888 | ||
4ee9c684 | 889 | static int |
b093181d | 890 | mem_seek (unix_stream * s, gfc_offset offset) |
4ee9c684 | 891 | { |
4ee9c684 | 892 | if (offset > s->file_length) |
893 | { | |
894 | errno = ESPIPE; | |
895 | return FAILURE; | |
896 | } | |
897 | ||
898 | s->logical_offset = offset; | |
899 | return SUCCESS; | |
900 | } | |
901 | ||
902 | ||
56f281a2 | 903 | static try |
904 | mem_set (unix_stream * s, int c, size_t n) | |
905 | { | |
906 | void *p; | |
907 | int len; | |
908 | ||
909 | len = n; | |
910 | ||
911 | p = mem_alloc_w_at (s, &len, -1); | |
912 | if (p) | |
913 | { | |
914 | memset (p, c, len); | |
915 | return SUCCESS; | |
916 | } | |
917 | else | |
918 | return FAILURE; | |
919 | } | |
920 | ||
921 | ||
4ee9c684 | 922 | static int |
a0007dfa | 923 | mem_truncate (unix_stream * s __attribute__ ((unused))) |
4ee9c684 | 924 | { |
4ee9c684 | 925 | return SUCCESS; |
926 | } | |
927 | ||
928 | ||
929 | static try | |
930 | mem_close (unix_stream * s) | |
931 | { | |
46ca759c | 932 | if (s != NULL) |
933 | free_mem (s); | |
4ee9c684 | 934 | |
935 | return SUCCESS; | |
936 | } | |
937 | ||
938 | ||
939 | static try | |
a0007dfa | 940 | mem_sfree (unix_stream * s __attribute__ ((unused))) |
4ee9c684 | 941 | { |
4ee9c684 | 942 | return SUCCESS; |
943 | } | |
944 | ||
945 | ||
946 | ||
947 | /********************************************************************* | |
948 | Public functions -- A reimplementation of this module needs to | |
949 | define functional equivalents of the following. | |
950 | *********************************************************************/ | |
951 | ||
952 | /* empty_internal_buffer()-- Zero the buffer of Internal file */ | |
953 | ||
954 | void | |
955 | empty_internal_buffer(stream *strm) | |
956 | { | |
7145fd06 | 957 | unix_stream * s = (unix_stream *) strm; |
958 | memset(s->buffer, ' ', s->file_length); | |
4ee9c684 | 959 | } |
960 | ||
961 | /* open_internal()-- Returns a stream structure from an internal file */ | |
962 | ||
963 | stream * | |
964 | open_internal (char *base, int length) | |
965 | { | |
966 | unix_stream *s; | |
967 | ||
968 | s = get_mem (sizeof (unix_stream)); | |
8f8ad899 | 969 | memset (s, '\0', sizeof (unix_stream)); |
4ee9c684 | 970 | |
971 | s->buffer = base; | |
972 | s->buffer_offset = 0; | |
973 | ||
974 | s->logical_offset = 0; | |
975 | s->active = s->file_length = length; | |
976 | ||
977 | s->st.alloc_r_at = (void *) mem_alloc_r_at; | |
978 | s->st.alloc_w_at = (void *) mem_alloc_w_at; | |
979 | s->st.sfree = (void *) mem_sfree; | |
980 | s->st.close = (void *) mem_close; | |
981 | s->st.seek = (void *) mem_seek; | |
982 | s->st.truncate = (void *) mem_truncate; | |
b2a112ca | 983 | s->st.read = (void *) mem_read; |
984 | s->st.write = (void *) mem_write; | |
56f281a2 | 985 | s->st.set = (void *) mem_set; |
4ee9c684 | 986 | |
987 | return (stream *) s; | |
988 | } | |
989 | ||
990 | ||
991 | /* fd_to_stream()-- Given an open file descriptor, build a stream | |
992 | * around it. */ | |
993 | ||
994 | static stream * | |
f0b5d33f | 995 | fd_to_stream (int fd, int prot) |
4ee9c684 | 996 | { |
997 | struct stat statbuf; | |
998 | unix_stream *s; | |
999 | ||
1000 | s = get_mem (sizeof (unix_stream)); | |
8f8ad899 | 1001 | memset (s, '\0', sizeof (unix_stream)); |
4ee9c684 | 1002 | |
1003 | s->fd = fd; | |
1004 | s->buffer_offset = 0; | |
1005 | s->physical_offset = 0; | |
1006 | s->logical_offset = 0; | |
1007 | s->prot = prot; | |
1008 | ||
1009 | /* Get the current length of the file. */ | |
1010 | ||
1011 | fstat (fd, &statbuf); | |
1012 | s->file_length = S_ISREG (statbuf.st_mode) ? statbuf.st_size : -1; | |
227e9423 | 1013 | s->special_file = !S_ISREG (statbuf.st_mode); |
4ee9c684 | 1014 | |
4ee9c684 | 1015 | fd_open (s); |
4ee9c684 | 1016 | |
1017 | return (stream *) s; | |
1018 | } | |
1019 | ||
1020 | ||
771c1b50 | 1021 | /* Given the Fortran unit number, convert it to a C file descriptor. */ |
1022 | ||
1023 | int | |
60c514ba | 1024 | unit_to_fd (int unit) |
771c1b50 | 1025 | { |
771c1b50 | 1026 | gfc_unit *us; |
60c514ba | 1027 | int fd; |
771c1b50 | 1028 | |
60c514ba | 1029 | us = find_unit (unit); |
771c1b50 | 1030 | if (us == NULL) |
1031 | return -1; | |
1032 | ||
60c514ba | 1033 | fd = ((unix_stream *) us->s)->fd; |
1034 | unlock_unit (us); | |
1035 | return fd; | |
771c1b50 | 1036 | } |
1037 | ||
1038 | ||
4ee9c684 | 1039 | /* unpack_filename()-- Given a fortran string and a pointer to a |
1040 | * buffer that is PATH_MAX characters, convert the fortran string to a | |
1041 | * C string in the buffer. Returns nonzero if this is not possible. */ | |
1042 | ||
1dc95e51 | 1043 | int |
4ee9c684 | 1044 | unpack_filename (char *cstring, const char *fstring, int len) |
1045 | { | |
4ee9c684 | 1046 | len = fstrlen (fstring, len); |
1047 | if (len >= PATH_MAX) | |
1048 | return 1; | |
1049 | ||
1050 | memmove (cstring, fstring, len); | |
1051 | cstring[len] = '\0'; | |
1052 | ||
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | ||
1057 | /* tempfile()-- Generate a temporary filename for a scratch file and | |
1058 | * open it. mkstemp() opens the file for reading and writing, but the | |
1059 | * library mode prevents anything that is not allowed. The descriptor | |
7dfba97b | 1060 | * is returned, which is -1 on error. The template is pointed to by |
60c514ba | 1061 | * opp->file, which is copied into the unit structure |
4ee9c684 | 1062 | * and freed later. */ |
1063 | ||
1064 | static int | |
60c514ba | 1065 | tempfile (st_parameter_open *opp) |
4ee9c684 | 1066 | { |
1067 | const char *tempdir; | |
1068 | char *template; | |
1069 | int fd; | |
1070 | ||
1071 | tempdir = getenv ("GFORTRAN_TMPDIR"); | |
1072 | if (tempdir == NULL) | |
1073 | tempdir = getenv ("TMP"); | |
ac09d5cc | 1074 | if (tempdir == NULL) |
1075 | tempdir = getenv ("TEMP"); | |
4ee9c684 | 1076 | if (tempdir == NULL) |
1077 | tempdir = DEFAULT_TEMPDIR; | |
1078 | ||
1079 | template = get_mem (strlen (tempdir) + 20); | |
1080 | ||
7dfba97b | 1081 | st_sprintf (template, "%s/gfortrantmpXXXXXX", tempdir); |
1082 | ||
1083 | #ifdef HAVE_MKSTEMP | |
4ee9c684 | 1084 | |
1085 | fd = mkstemp (template); | |
1086 | ||
7dfba97b | 1087 | #else /* HAVE_MKSTEMP */ |
1088 | ||
1089 | if (mktemp (template)) | |
1090 | do | |
cf6a3896 | 1091 | #if defined(HAVE_CRLF) && defined(O_BINARY) |
cf55c3cf | 1092 | fd = open (template, O_RDWR | O_CREAT | O_EXCL | O_BINARY, |
1093 | S_IREAD | S_IWRITE); | |
1094 | #else | |
ac09d5cc | 1095 | fd = open (template, O_RDWR | O_CREAT | O_EXCL, S_IREAD | S_IWRITE); |
cf55c3cf | 1096 | #endif |
7dfba97b | 1097 | while (!(fd == -1 && errno == EEXIST) && mktemp (template)); |
1098 | else | |
1099 | fd = -1; | |
1100 | ||
1101 | #endif /* HAVE_MKSTEMP */ | |
1102 | ||
4ee9c684 | 1103 | if (fd < 0) |
1104 | free_mem (template); | |
1105 | else | |
1106 | { | |
60c514ba | 1107 | opp->file = template; |
1108 | opp->file_len = strlen (template); /* Don't include trailing nul */ | |
4ee9c684 | 1109 | } |
1110 | ||
1111 | return fd; | |
1112 | } | |
1113 | ||
1114 | ||
6d12c489 | 1115 | /* regular_file()-- Open a regular file. |
2d6ba0f9 | 1116 | * Change flags->action if it is ACTION_UNSPECIFIED on entry, |
1117 | * unless an error occurs. | |
6d12c489 | 1118 | * Returns the descriptor, which is less than zero on error. */ |
4ee9c684 | 1119 | |
1120 | static int | |
60c514ba | 1121 | regular_file (st_parameter_open *opp, unit_flags *flags) |
4ee9c684 | 1122 | { |
1123 | char path[PATH_MAX + 1]; | |
4ee9c684 | 1124 | int mode; |
6d12c489 | 1125 | int rwflag; |
2d6ba0f9 | 1126 | int crflag; |
6d12c489 | 1127 | int fd; |
4ee9c684 | 1128 | |
60c514ba | 1129 | if (unpack_filename (path, opp->file, opp->file_len)) |
4ee9c684 | 1130 | { |
1131 | errno = ENOENT; /* Fake an OS error */ | |
1132 | return -1; | |
1133 | } | |
1134 | ||
6d12c489 | 1135 | rwflag = 0; |
4ee9c684 | 1136 | |
6d12c489 | 1137 | switch (flags->action) |
4ee9c684 | 1138 | { |
1139 | case ACTION_READ: | |
6d12c489 | 1140 | rwflag = O_RDONLY; |
4ee9c684 | 1141 | break; |
1142 | ||
1143 | case ACTION_WRITE: | |
6d12c489 | 1144 | rwflag = O_WRONLY; |
4ee9c684 | 1145 | break; |
1146 | ||
1147 | case ACTION_READWRITE: | |
6d12c489 | 1148 | case ACTION_UNSPECIFIED: |
1149 | rwflag = O_RDWR; | |
4ee9c684 | 1150 | break; |
1151 | ||
1152 | default: | |
60c514ba | 1153 | internal_error (&opp->common, "regular_file(): Bad action"); |
4ee9c684 | 1154 | } |
1155 | ||
6d12c489 | 1156 | switch (flags->status) |
4ee9c684 | 1157 | { |
1158 | case STATUS_NEW: | |
2d6ba0f9 | 1159 | crflag = O_CREAT | O_EXCL; |
4ee9c684 | 1160 | break; |
1161 | ||
2d6ba0f9 | 1162 | case STATUS_OLD: /* open will fail if the file does not exist*/ |
1163 | crflag = 0; | |
4ee9c684 | 1164 | break; |
1165 | ||
1166 | case STATUS_UNKNOWN: | |
1167 | case STATUS_SCRATCH: | |
2d6ba0f9 | 1168 | crflag = O_CREAT; |
4ee9c684 | 1169 | break; |
1170 | ||
1171 | case STATUS_REPLACE: | |
2d6ba0f9 | 1172 | crflag = O_CREAT | O_TRUNC; |
4ee9c684 | 1173 | break; |
1174 | ||
1175 | default: | |
60c514ba | 1176 | internal_error (&opp->common, "regular_file(): Bad status"); |
4ee9c684 | 1177 | } |
1178 | ||
6d12c489 | 1179 | /* rwflag |= O_LARGEFILE; */ |
4ee9c684 | 1180 | |
cf6a3896 | 1181 | #if defined(HAVE_CRLF) && defined(O_BINARY) |
cf55c3cf | 1182 | crflag |= O_BINARY; |
1183 | #endif | |
1184 | ||
6d12c489 | 1185 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; |
2d6ba0f9 | 1186 | fd = open (path, rwflag | crflag, mode); |
1187 | if (flags->action != ACTION_UNSPECIFIED) | |
1188 | return fd; | |
1189 | ||
1190 | if (fd >= 0) | |
6d12c489 | 1191 | { |
2d6ba0f9 | 1192 | flags->action = ACTION_READWRITE; |
1193 | return fd; | |
6d12c489 | 1194 | } |
2d6ba0f9 | 1195 | if (errno != EACCES) |
1196 | return fd; | |
1197 | ||
1198 | /* retry for read-only access */ | |
1199 | rwflag = O_RDONLY; | |
1200 | fd = open (path, rwflag | crflag, mode); | |
1201 | if (fd >=0) | |
1202 | { | |
1203 | flags->action = ACTION_READ; | |
1204 | return fd; /* success */ | |
1205 | } | |
1206 | ||
1207 | if (errno != EACCES) | |
1208 | return fd; /* failure */ | |
1209 | ||
1210 | /* retry for write-only access */ | |
1211 | rwflag = O_WRONLY; | |
1212 | fd = open (path, rwflag | crflag, mode); | |
1213 | if (fd >=0) | |
1214 | { | |
1215 | flags->action = ACTION_WRITE; | |
1216 | return fd; /* success */ | |
1217 | } | |
1218 | return fd; /* failure */ | |
4ee9c684 | 1219 | } |
1220 | ||
1221 | ||
1222 | /* open_external()-- Open an external file, unix specific version. | |
6d12c489 | 1223 | * Change flags->action if it is ACTION_UNSPECIFIED on entry. |
4ee9c684 | 1224 | * Returns NULL on operating system error. */ |
1225 | ||
1226 | stream * | |
60c514ba | 1227 | open_external (st_parameter_open *opp, unit_flags *flags) |
4ee9c684 | 1228 | { |
1229 | int fd, prot; | |
1230 | ||
6d12c489 | 1231 | if (flags->status == STATUS_SCRATCH) |
1232 | { | |
60c514ba | 1233 | fd = tempfile (opp); |
6d12c489 | 1234 | if (flags->action == ACTION_UNSPECIFIED) |
1235 | flags->action = ACTION_READWRITE; | |
1dc95e51 | 1236 | |
1237 | #if HAVE_UNLINK_OPEN_FILE | |
6d12c489 | 1238 | /* We can unlink scratch files now and it will go away when closed. */ |
60c514ba | 1239 | if (fd >= 0) |
1240 | unlink (opp->file); | |
1dc95e51 | 1241 | #endif |
6d12c489 | 1242 | } |
1243 | else | |
1244 | { | |
2d6ba0f9 | 1245 | /* regular_file resets flags->action if it is ACTION_UNSPECIFIED and |
1246 | * if it succeeds */ | |
60c514ba | 1247 | fd = regular_file (opp, flags); |
6d12c489 | 1248 | } |
4ee9c684 | 1249 | |
1250 | if (fd < 0) | |
1251 | return NULL; | |
1252 | fd = fix_fd (fd); | |
1253 | ||
6d12c489 | 1254 | switch (flags->action) |
4ee9c684 | 1255 | { |
1256 | case ACTION_READ: | |
1257 | prot = PROT_READ; | |
1258 | break; | |
1259 | ||
1260 | case ACTION_WRITE: | |
1261 | prot = PROT_WRITE; | |
1262 | break; | |
1263 | ||
1264 | case ACTION_READWRITE: | |
1265 | prot = PROT_READ | PROT_WRITE; | |
1266 | break; | |
1267 | ||
1268 | default: | |
60c514ba | 1269 | internal_error (&opp->common, "open_external(): Bad action"); |
4ee9c684 | 1270 | } |
1271 | ||
f0b5d33f | 1272 | return fd_to_stream (fd, prot); |
4ee9c684 | 1273 | } |
1274 | ||
1275 | ||
1276 | /* input_stream()-- Return a stream pointer to the default input stream. | |
1277 | * Called on initialization. */ | |
1278 | ||
1279 | stream * | |
1280 | input_stream (void) | |
1281 | { | |
f0b5d33f | 1282 | return fd_to_stream (STDIN_FILENO, PROT_READ); |
4ee9c684 | 1283 | } |
1284 | ||
1285 | ||
ff81ee3b | 1286 | /* output_stream()-- Return a stream pointer to the default output stream. |
4ee9c684 | 1287 | * Called on initialization. */ |
1288 | ||
1289 | stream * | |
1290 | output_stream (void) | |
1291 | { | |
f0b5d33f | 1292 | return fd_to_stream (STDOUT_FILENO, PROT_WRITE); |
4ee9c684 | 1293 | } |
1294 | ||
1295 | ||
ff81ee3b | 1296 | /* error_stream()-- Return a stream pointer to the default error stream. |
1297 | * Called on initialization. */ | |
1298 | ||
1299 | stream * | |
1300 | error_stream (void) | |
1301 | { | |
f0b5d33f | 1302 | return fd_to_stream (STDERR_FILENO, PROT_WRITE); |
ff81ee3b | 1303 | } |
1304 | ||
4ee9c684 | 1305 | /* init_error_stream()-- Return a pointer to the error stream. This |
1306 | * subroutine is called when the stream is needed, rather than at | |
1307 | * initialization. We want to work even if memory has been seriously | |
1308 | * corrupted. */ | |
1309 | ||
1310 | stream * | |
60c514ba | 1311 | init_error_stream (unix_stream *error) |
4ee9c684 | 1312 | { |
60c514ba | 1313 | memset (error, '\0', sizeof (*error)); |
4ee9c684 | 1314 | |
60c514ba | 1315 | error->fd = options.use_stderr ? STDERR_FILENO : STDOUT_FILENO; |
4ee9c684 | 1316 | |
60c514ba | 1317 | error->st.alloc_w_at = (void *) fd_alloc_w_at; |
1318 | error->st.sfree = (void *) fd_sfree; | |
4ee9c684 | 1319 | |
60c514ba | 1320 | error->unbuffered = 1; |
1321 | error->buffer = error->small_buffer; | |
4ee9c684 | 1322 | |
60c514ba | 1323 | return (stream *) error; |
4ee9c684 | 1324 | } |
1325 | ||
1326 | ||
1327 | /* compare_file_filename()-- Given an open stream and a fortran string | |
1328 | * that is a filename, figure out if the file is the same as the | |
1329 | * filename. */ | |
1330 | ||
1331 | int | |
daad4fd5 | 1332 | compare_file_filename (gfc_unit *u, const char *name, int len) |
4ee9c684 | 1333 | { |
1334 | char path[PATH_MAX + 1]; | |
daad4fd5 | 1335 | struct stat st1; |
1336 | #ifdef HAVE_WORKING_STAT | |
1337 | struct stat st2; | |
1338 | #endif | |
4ee9c684 | 1339 | |
1340 | if (unpack_filename (path, name, len)) | |
1341 | return 0; /* Can't be the same */ | |
1342 | ||
1343 | /* If the filename doesn't exist, then there is no match with the | |
1344 | * existing file. */ | |
1345 | ||
1346 | if (stat (path, &st1) < 0) | |
1347 | return 0; | |
1348 | ||
daad4fd5 | 1349 | #ifdef HAVE_WORKING_STAT |
1350 | fstat (((unix_stream *) (u->s))->fd, &st2); | |
4ee9c684 | 1351 | return (st1.st_dev == st2.st_dev) && (st1.st_ino == st2.st_ino); |
daad4fd5 | 1352 | #else |
1353 | if (len != u->file_len) | |
1354 | return 0; | |
1355 | return (memcmp(path, u->file, len) == 0); | |
1356 | #endif | |
4ee9c684 | 1357 | } |
1358 | ||
1359 | ||
60c514ba | 1360 | #ifdef HAVE_WORKING_STAT |
1361 | # define FIND_FILE0_DECL struct stat *st | |
1362 | # define FIND_FILE0_ARGS st | |
1363 | #else | |
1364 | # define FIND_FILE0_DECL const char *file, gfc_charlen_type file_len | |
1365 | # define FIND_FILE0_ARGS file, file_len | |
1366 | #endif | |
1367 | ||
4ee9c684 | 1368 | /* find_file0()-- Recursive work function for find_file() */ |
1369 | ||
f02dd226 | 1370 | static gfc_unit * |
60c514ba | 1371 | find_file0 (gfc_unit *u, FIND_FILE0_DECL) |
4ee9c684 | 1372 | { |
f02dd226 | 1373 | gfc_unit *v; |
4ee9c684 | 1374 | |
1375 | if (u == NULL) | |
1376 | return NULL; | |
1377 | ||
daad4fd5 | 1378 | #ifdef HAVE_WORKING_STAT |
60c514ba | 1379 | if (u->s != NULL |
1380 | && fstat (((unix_stream *) u->s)->fd, &st[1]) >= 0 && | |
1381 | st[0].st_dev == st[1].st_dev && st[0].st_ino == st[1].st_ino) | |
4ee9c684 | 1382 | return u; |
daad4fd5 | 1383 | #else |
60c514ba | 1384 | if (compare_string (u->file_len, u->file, file_len, file) == 0) |
daad4fd5 | 1385 | return u; |
1386 | #endif | |
4ee9c684 | 1387 | |
60c514ba | 1388 | v = find_file0 (u->left, FIND_FILE0_ARGS); |
4ee9c684 | 1389 | if (v != NULL) |
1390 | return v; | |
1391 | ||
60c514ba | 1392 | v = find_file0 (u->right, FIND_FILE0_ARGS); |
4ee9c684 | 1393 | if (v != NULL) |
1394 | return v; | |
1395 | ||
1396 | return NULL; | |
1397 | } | |
1398 | ||
1399 | ||
1400 | /* find_file()-- Take the current filename and see if there is a unit | |
1401 | * that has the file already open. Returns a pointer to the unit if so. */ | |
1402 | ||
f02dd226 | 1403 | gfc_unit * |
60c514ba | 1404 | find_file (const char *file, gfc_charlen_type file_len) |
4ee9c684 | 1405 | { |
1406 | char path[PATH_MAX + 1]; | |
60c514ba | 1407 | struct stat st[2]; |
1408 | gfc_unit *u; | |
4ee9c684 | 1409 | |
60c514ba | 1410 | if (unpack_filename (path, file, file_len)) |
4ee9c684 | 1411 | return NULL; |
1412 | ||
60c514ba | 1413 | if (stat (path, &st[0]) < 0) |
4ee9c684 | 1414 | return NULL; |
1415 | ||
60c514ba | 1416 | __gthread_mutex_lock (&unit_lock); |
1417 | retry: | |
1418 | u = find_file0 (unit_root, FIND_FILE0_ARGS); | |
1419 | if (u != NULL) | |
1420 | { | |
1421 | /* Fast path. */ | |
1422 | if (! __gthread_mutex_trylock (&u->lock)) | |
1423 | { | |
1424 | /* assert (u->closed == 0); */ | |
1425 | __gthread_mutex_unlock (&unit_lock); | |
1426 | return u; | |
1427 | } | |
1428 | ||
1429 | inc_waiting_locked (u); | |
1430 | } | |
1431 | __gthread_mutex_unlock (&unit_lock); | |
1432 | if (u != NULL) | |
1433 | { | |
1434 | __gthread_mutex_lock (&u->lock); | |
1435 | if (u->closed) | |
1436 | { | |
1437 | __gthread_mutex_lock (&unit_lock); | |
1438 | __gthread_mutex_unlock (&u->lock); | |
1439 | if (predec_waiting_locked (u) == 0) | |
1440 | free_mem (u); | |
1441 | goto retry; | |
1442 | } | |
1443 | ||
1444 | dec_waiting_unlocked (u); | |
1445 | } | |
1446 | return u; | |
1447 | } | |
1448 | ||
1449 | static gfc_unit * | |
1450 | flush_all_units_1 (gfc_unit *u, int min_unit) | |
1451 | { | |
1452 | while (u != NULL) | |
1453 | { | |
1454 | if (u->unit_number > min_unit) | |
1455 | { | |
1456 | gfc_unit *r = flush_all_units_1 (u->left, min_unit); | |
1457 | if (r != NULL) | |
1458 | return r; | |
1459 | } | |
1460 | if (u->unit_number >= min_unit) | |
1461 | { | |
1462 | if (__gthread_mutex_trylock (&u->lock)) | |
1463 | return u; | |
1464 | if (u->s) | |
1465 | flush (u->s); | |
1466 | __gthread_mutex_unlock (&u->lock); | |
1467 | } | |
1468 | u = u->right; | |
1469 | } | |
1470 | return NULL; | |
1471 | } | |
1472 | ||
1473 | void | |
1474 | flush_all_units (void) | |
1475 | { | |
1476 | gfc_unit *u; | |
1477 | int min_unit = 0; | |
1478 | ||
1479 | __gthread_mutex_lock (&unit_lock); | |
1480 | do | |
1481 | { | |
1482 | u = flush_all_units_1 (unit_root, min_unit); | |
1483 | if (u != NULL) | |
1484 | inc_waiting_locked (u); | |
1485 | __gthread_mutex_unlock (&unit_lock); | |
1486 | if (u == NULL) | |
1487 | return; | |
1488 | ||
1489 | __gthread_mutex_lock (&u->lock); | |
1490 | ||
1491 | min_unit = u->unit_number + 1; | |
1492 | ||
1493 | if (u->closed == 0) | |
1494 | { | |
1495 | flush (u->s); | |
1496 | __gthread_mutex_lock (&unit_lock); | |
1497 | __gthread_mutex_unlock (&u->lock); | |
1498 | (void) predec_waiting_locked (u); | |
1499 | } | |
1500 | else | |
1501 | { | |
1502 | __gthread_mutex_lock (&unit_lock); | |
1503 | __gthread_mutex_unlock (&u->lock); | |
1504 | if (predec_waiting_locked (u) == 0) | |
1505 | free_mem (u); | |
1506 | } | |
1507 | } | |
1508 | while (1); | |
4ee9c684 | 1509 | } |
1510 | ||
1511 | ||
1512 | /* stream_at_bof()-- Returns nonzero if the stream is at the beginning | |
1513 | * of the file. */ | |
1514 | ||
1515 | int | |
1516 | stream_at_bof (stream * s) | |
1517 | { | |
1518 | unix_stream *us; | |
1519 | ||
5df4b62f | 1520 | if (!is_seekable (s)) |
1521 | return 0; | |
4ee9c684 | 1522 | |
5df4b62f | 1523 | us = (unix_stream *) s; |
4ee9c684 | 1524 | |
1525 | return us->logical_offset == 0; | |
1526 | } | |
1527 | ||
1528 | ||
cf6a3896 | 1529 | /* stream_at_eof()-- Returns nonzero if the stream is at the end |
4ee9c684 | 1530 | * of the file. */ |
1531 | ||
1532 | int | |
1533 | stream_at_eof (stream * s) | |
1534 | { | |
1535 | unix_stream *us; | |
1536 | ||
5df4b62f | 1537 | if (!is_seekable (s)) |
1538 | return 0; | |
4ee9c684 | 1539 | |
5df4b62f | 1540 | us = (unix_stream *) s; |
4ee9c684 | 1541 | |
1542 | return us->logical_offset == us->dirty_offset; | |
1543 | } | |
1544 | ||
1545 | ||
1546 | /* delete_file()-- Given a unit structure, delete the file associated | |
1547 | * with the unit. Returns nonzero if something went wrong. */ | |
1548 | ||
1549 | int | |
f02dd226 | 1550 | delete_file (gfc_unit * u) |
4ee9c684 | 1551 | { |
1552 | char path[PATH_MAX + 1]; | |
1553 | ||
1554 | if (unpack_filename (path, u->file, u->file_len)) | |
1555 | { /* Shouldn't be possible */ | |
1556 | errno = ENOENT; | |
1557 | return 1; | |
1558 | } | |
1559 | ||
1560 | return unlink (path); | |
1561 | } | |
1562 | ||
1563 | ||
1564 | /* file_exists()-- Returns nonzero if the current filename exists on | |
1565 | * the system */ | |
1566 | ||
1567 | int | |
60c514ba | 1568 | file_exists (const char *file, gfc_charlen_type file_len) |
4ee9c684 | 1569 | { |
1570 | char path[PATH_MAX + 1]; | |
1571 | struct stat statbuf; | |
1572 | ||
60c514ba | 1573 | if (unpack_filename (path, file, file_len)) |
4ee9c684 | 1574 | return 0; |
1575 | ||
1576 | if (stat (path, &statbuf) < 0) | |
1577 | return 0; | |
1578 | ||
1579 | return 1; | |
1580 | } | |
1581 | ||
1582 | ||
1583 | ||
fb35179a | 1584 | static const char yes[] = "YES", no[] = "NO", unknown[] = "UNKNOWN"; |
4ee9c684 | 1585 | |
1586 | /* inquire_sequential()-- Given a fortran string, determine if the | |
1587 | * file is suitable for sequential access. Returns a C-style | |
1588 | * string. */ | |
1589 | ||
1590 | const char * | |
1591 | inquire_sequential (const char *string, int len) | |
1592 | { | |
1593 | char path[PATH_MAX + 1]; | |
1594 | struct stat statbuf; | |
1595 | ||
1596 | if (string == NULL || | |
1597 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1598 | return unknown; | |
1599 | ||
1600 | if (S_ISREG (statbuf.st_mode) || | |
1601 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1602 | return yes; | |
1603 | ||
1604 | if (S_ISDIR (statbuf.st_mode) || S_ISBLK (statbuf.st_mode)) | |
1605 | return no; | |
1606 | ||
1607 | return unknown; | |
1608 | } | |
1609 | ||
1610 | ||
1611 | /* inquire_direct()-- Given a fortran string, determine if the file is | |
1612 | * suitable for direct access. Returns a C-style string. */ | |
1613 | ||
1614 | const char * | |
1615 | inquire_direct (const char *string, int len) | |
1616 | { | |
1617 | char path[PATH_MAX + 1]; | |
1618 | struct stat statbuf; | |
1619 | ||
1620 | if (string == NULL || | |
1621 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1622 | return unknown; | |
1623 | ||
1624 | if (S_ISREG (statbuf.st_mode) || S_ISBLK (statbuf.st_mode)) | |
1625 | return yes; | |
1626 | ||
1627 | if (S_ISDIR (statbuf.st_mode) || | |
1628 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1629 | return no; | |
1630 | ||
1631 | return unknown; | |
1632 | } | |
1633 | ||
1634 | ||
1635 | /* inquire_formatted()-- Given a fortran string, determine if the file | |
1636 | * is suitable for formatted form. Returns a C-style string. */ | |
1637 | ||
1638 | const char * | |
1639 | inquire_formatted (const char *string, int len) | |
1640 | { | |
1641 | char path[PATH_MAX + 1]; | |
1642 | struct stat statbuf; | |
1643 | ||
1644 | if (string == NULL || | |
1645 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1646 | return unknown; | |
1647 | ||
1648 | if (S_ISREG (statbuf.st_mode) || | |
1649 | S_ISBLK (statbuf.st_mode) || | |
1650 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1651 | return yes; | |
1652 | ||
1653 | if (S_ISDIR (statbuf.st_mode)) | |
1654 | return no; | |
1655 | ||
1656 | return unknown; | |
1657 | } | |
1658 | ||
1659 | ||
1660 | /* inquire_unformatted()-- Given a fortran string, determine if the file | |
1661 | * is suitable for unformatted form. Returns a C-style string. */ | |
1662 | ||
1663 | const char * | |
1664 | inquire_unformatted (const char *string, int len) | |
1665 | { | |
4ee9c684 | 1666 | return inquire_formatted (string, len); |
1667 | } | |
1668 | ||
1669 | ||
1670 | /* inquire_access()-- Given a fortran string, determine if the file is | |
1671 | * suitable for access. */ | |
1672 | ||
1673 | static const char * | |
1674 | inquire_access (const char *string, int len, int mode) | |
1675 | { | |
1676 | char path[PATH_MAX + 1]; | |
1677 | ||
1678 | if (string == NULL || unpack_filename (path, string, len) || | |
1679 | access (path, mode) < 0) | |
1680 | return no; | |
1681 | ||
1682 | return yes; | |
1683 | } | |
1684 | ||
1685 | ||
1686 | /* inquire_read()-- Given a fortran string, determine if the file is | |
1687 | * suitable for READ access. */ | |
1688 | ||
1689 | const char * | |
1690 | inquire_read (const char *string, int len) | |
1691 | { | |
4ee9c684 | 1692 | return inquire_access (string, len, R_OK); |
1693 | } | |
1694 | ||
1695 | ||
1696 | /* inquire_write()-- Given a fortran string, determine if the file is | |
1697 | * suitable for READ access. */ | |
1698 | ||
1699 | const char * | |
1700 | inquire_write (const char *string, int len) | |
1701 | { | |
4ee9c684 | 1702 | return inquire_access (string, len, W_OK); |
1703 | } | |
1704 | ||
1705 | ||
1706 | /* inquire_readwrite()-- Given a fortran string, determine if the file is | |
1707 | * suitable for read and write access. */ | |
1708 | ||
1709 | const char * | |
1710 | inquire_readwrite (const char *string, int len) | |
1711 | { | |
4ee9c684 | 1712 | return inquire_access (string, len, R_OK | W_OK); |
1713 | } | |
1714 | ||
1715 | ||
1716 | /* file_length()-- Return the file length in bytes, -1 if unknown */ | |
1717 | ||
b093181d | 1718 | gfc_offset |
4ee9c684 | 1719 | file_length (stream * s) |
1720 | { | |
4ee9c684 | 1721 | return ((unix_stream *) s)->file_length; |
1722 | } | |
1723 | ||
1724 | ||
1725 | /* file_position()-- Return the current position of the file */ | |
1726 | ||
b093181d | 1727 | gfc_offset |
4ee9c684 | 1728 | file_position (stream * s) |
1729 | { | |
4ee9c684 | 1730 | return ((unix_stream *) s)->logical_offset; |
1731 | } | |
1732 | ||
1733 | ||
1734 | /* is_seekable()-- Return nonzero if the stream is seekable, zero if | |
1735 | * it is not */ | |
1736 | ||
1737 | int | |
1738 | is_seekable (stream * s) | |
1739 | { | |
b2a112ca | 1740 | /* By convention, if file_length == -1, the file is not |
1741 | seekable. */ | |
5a78b88f | 1742 | return ((unix_stream *) s)->file_length!=-1; |
4ee9c684 | 1743 | } |
1744 | ||
b0342e98 | 1745 | try |
1746 | flush (stream *s) | |
1747 | { | |
1748 | return fd_flush( (unix_stream *) s); | |
1749 | } | |
1750 | ||
60d77e0d | 1751 | int |
1752 | stream_isatty (stream *s) | |
1753 | { | |
1754 | return isatty (((unix_stream *) s)->fd); | |
1755 | } | |
1756 | ||
1757 | char * | |
1758 | stream_ttyname (stream *s) | |
1759 | { | |
f2c0a16d | 1760 | #ifdef HAVE_TTYNAME |
60d77e0d | 1761 | return ttyname (((unix_stream *) s)->fd); |
f2c0a16d | 1762 | #else |
1763 | return NULL; | |
1764 | #endif | |
60d77e0d | 1765 | } |
1766 | ||
16de8065 | 1767 | gfc_offset |
1768 | stream_offset (stream *s) | |
1769 | { | |
1770 | return (((unix_stream *) s)->logical_offset); | |
1771 | } | |
1772 | ||
4ee9c684 | 1773 | |
1774 | /* How files are stored: This is an operating-system specific issue, | |
1775 | and therefore belongs here. There are three cases to consider. | |
1776 | ||
1777 | Direct Access: | |
1778 | Records are written as block of bytes corresponding to the record | |
1779 | length of the file. This goes for both formatted and unformatted | |
1780 | records. Positioning is done explicitly for each data transfer, | |
1781 | so positioning is not much of an issue. | |
1782 | ||
1783 | Sequential Formatted: | |
1784 | Records are separated by newline characters. The newline character | |
1785 | is prohibited from appearing in a string. If it does, this will be | |
1786 | messed up on the next read. End of file is also the end of a record. | |
1787 | ||
1788 | Sequential Unformatted: | |
1789 | In this case, we are merely copying bytes to and from main storage, | |
1790 | yet we need to keep track of varying record lengths. We adopt | |
1791 | the solution used by f2c. Each record contains a pair of length | |
1792 | markers: | |
1793 | ||
1794 | Length of record n in bytes | |
1795 | Data of record n | |
1796 | Length of record n in bytes | |
1797 | ||
1798 | Length of record n+1 in bytes | |
1799 | Data of record n+1 | |
1800 | Length of record n+1 in bytes | |
1801 | ||
1802 | The length is stored at the end of a record to allow backspacing to the | |
1803 | previous record. Between data transfer statements, the file pointer | |
1804 | is left pointing to the first length of the current record. | |
1805 | ||
1806 | ENDFILE records are never explicitly stored. | |
1807 | ||
1808 | */ |