1 | /* Copyright (C) 1993-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Written by Per Bothner <bothner@cygnus.com>. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. |
18 | |
19 | As a special exception, if you link the code in this file with |
20 | files compiled with a GNU compiler to produce an executable, |
21 | that does not cause the resulting executable to be covered by |
22 | the GNU Lesser General Public License. This exception does not |
23 | however invalidate any other reasons why the executable file |
24 | might be covered by the GNU Lesser General Public License. |
25 | This exception applies to code released by its copyright holders |
26 | in files containing the exception. */ |
27 | |
28 | |
29 | #ifndef _POSIX_SOURCE |
30 | # define _POSIX_SOURCE |
31 | #endif |
32 | #include "libioP.h" |
33 | #include <assert.h> |
34 | #include <fcntl.h> |
35 | #include <sys/mman.h> |
36 | #include <sys/param.h> |
37 | #include <sys/types.h> |
38 | #include <sys/stat.h> |
39 | #include <string.h> |
40 | #include <errno.h> |
41 | #include <unistd.h> |
42 | #include <stdlib.h> |
43 | #if _LIBC |
44 | # include "../wcsmbs/wcsmbsload.h" |
45 | # include "../iconv/gconv_charset.h" |
46 | # include "../iconv/gconv_int.h" |
47 | # include <shlib-compat.h> |
48 | # include <not-cancel.h> |
49 | # include <kernel-features.h> |
50 | #endif |
51 | #ifndef errno |
52 | extern int errno; |
53 | #endif |
54 | #ifndef __set_errno |
55 | # define __set_errno(Val) errno = (Val) |
56 | #endif |
57 | |
58 | |
59 | #ifdef _LIBC |
60 | # define open(Name, Flags, Prot) __open (Name, Flags, Prot) |
61 | # define lseek(FD, Offset, Whence) __lseek (FD, Offset, Whence) |
62 | # define read(FD, Buf, NBytes) __read (FD, Buf, NBytes) |
63 | # define write(FD, Buf, NBytes) __write (FD, Buf, NBytes) |
64 | #else |
65 | # define _IO_new_do_write _IO_do_write |
66 | # define _IO_new_file_attach _IO_file_attach |
67 | # define _IO_new_file_close_it _IO_file_close_it |
68 | # define _IO_new_file_finish _IO_file_finish |
69 | # define _IO_new_file_fopen _IO_file_fopen |
70 | # define _IO_new_file_init _IO_file_init |
71 | # define _IO_new_file_setbuf _IO_file_setbuf |
72 | # define _IO_new_file_sync _IO_file_sync |
73 | # define _IO_new_file_overflow _IO_file_overflow |
74 | # define _IO_new_file_seekoff _IO_file_seekoff |
75 | # define _IO_new_file_underflow _IO_file_underflow |
76 | # define _IO_new_file_write _IO_file_write |
77 | # define _IO_new_file_xsputn _IO_file_xsputn |
78 | #endif |
79 | |
80 | |
81 | #ifdef _LIBC |
82 | extern struct __gconv_trans_data __libio_translit attribute_hidden; |
83 | #endif |
84 | |
85 | |
86 | /* An fstream can be in at most one of put mode, get mode, or putback mode. |
87 | Putback mode is a variant of get mode. |
88 | |
89 | In a filebuf, there is only one current position, instead of two |
90 | separate get and put pointers. In get mode, the current position |
91 | is that of gptr(); in put mode that of pptr(). |
92 | |
93 | The position in the buffer that corresponds to the position |
94 | in external file system is normally _IO_read_end, except in putback |
95 | mode, when it is _IO_save_end and also when the file is in append mode, |
96 | since switching from read to write mode automatically sends the position in |
97 | the external file system to the end of file. |
98 | If the field _fb._offset is >= 0, it gives the offset in |
99 | the file as a whole corresponding to eGptr(). (?) |
100 | |
101 | PUT MODE: |
102 | If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end, |
103 | and _IO_read_base are equal to each other. These are usually equal |
104 | to _IO_buf_base, though not necessarily if we have switched from |
105 | get mode to put mode. (The reason is to maintain the invariant |
106 | that _IO_read_end corresponds to the external file position.) |
107 | _IO_write_base is non-NULL and usually equal to _IO_buf_base. |
108 | We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode. |
109 | The un-flushed character are those between _IO_write_base and _IO_write_ptr. |
110 | |
111 | GET MODE: |
112 | If a filebuf is in get or putback mode, eback() != egptr(). |
113 | In get mode, the unread characters are between gptr() and egptr(). |
114 | The OS file position corresponds to that of egptr(). |
115 | |
116 | PUTBACK MODE: |
117 | Putback mode is used to remember "excess" characters that have |
118 | been sputbackc'd in a separate putback buffer. |
119 | In putback mode, the get buffer points to the special putback buffer. |
120 | The unread characters are the characters between gptr() and egptr() |
121 | in the putback buffer, as well as the area between save_gptr() |
122 | and save_egptr(), which point into the original reserve buffer. |
123 | (The pointers save_gptr() and save_egptr() are the values |
124 | of gptr() and egptr() at the time putback mode was entered.) |
125 | The OS position corresponds to that of save_egptr(). |
126 | |
127 | LINE BUFFERED OUTPUT: |
128 | During line buffered output, _IO_write_base==base() && epptr()==base(). |
129 | However, ptr() may be anywhere between base() and ebuf(). |
130 | This forces a call to filebuf::overflow(int C) on every put. |
131 | If there is more space in the buffer, and C is not a '\n', |
132 | then C is inserted, and pptr() incremented. |
133 | |
134 | UNBUFFERED STREAMS: |
135 | If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer. |
136 | */ |
137 | |
138 | #define CLOSED_FILEBUF_FLAGS \ |
139 | (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET) |
140 | |
141 | |
142 | void |
143 | _IO_new_file_init_internal (struct _IO_FILE_plus *fp) |
144 | { |
145 | /* POSIX.1 allows another file handle to be used to change the position |
146 | of our file descriptor. Hence we actually don't know the actual |
147 | position before we do the first fseek (and until a following fflush). */ |
148 | fp->file._offset = _IO_pos_BAD; |
149 | fp->file._IO_file_flags |= CLOSED_FILEBUF_FLAGS; |
150 | |
151 | _IO_link_in (fp); |
152 | fp->file._fileno = -1; |
153 | } |
154 | |
155 | /* External version of _IO_new_file_init_internal which switches off |
156 | vtable validation. */ |
157 | void |
158 | _IO_new_file_init (struct _IO_FILE_plus *fp) |
159 | { |
160 | IO_set_accept_foreign_vtables (&_IO_vtable_check); |
161 | _IO_new_file_init_internal (fp); |
162 | } |
163 | |
164 | int |
165 | _IO_new_file_close_it (_IO_FILE *fp) |
166 | { |
167 | int write_status; |
168 | if (!_IO_file_is_open (fp)) |
169 | return EOF; |
170 | |
171 | if ((fp->_flags & _IO_NO_WRITES) == 0 |
172 | && (fp->_flags & _IO_CURRENTLY_PUTTING) != 0) |
173 | write_status = _IO_do_flush (fp); |
174 | else |
175 | write_status = 0; |
176 | |
177 | _IO_unsave_markers (fp); |
178 | |
179 | int close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
180 | ? _IO_SYSCLOSE (fp) : 0); |
181 | |
182 | /* Free buffer. */ |
183 | #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T |
184 | if (fp->_mode > 0) |
185 | { |
186 | if (_IO_have_wbackup (fp)) |
187 | _IO_free_wbackup_area (fp); |
188 | _IO_wsetb (fp, NULL, NULL, 0); |
189 | _IO_wsetg (fp, NULL, NULL, NULL); |
190 | _IO_wsetp (fp, NULL, NULL); |
191 | } |
192 | #endif |
193 | _IO_setb (fp, NULL, NULL, 0); |
194 | _IO_setg (fp, NULL, NULL, NULL); |
195 | _IO_setp (fp, NULL, NULL); |
196 | |
197 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
198 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
199 | fp->_fileno = -1; |
200 | fp->_offset = _IO_pos_BAD; |
201 | |
202 | return close_status ? close_status : write_status; |
203 | } |
204 | libc_hidden_ver (_IO_new_file_close_it, _IO_file_close_it) |
205 | |
206 | void |
207 | _IO_new_file_finish (_IO_FILE *fp, int dummy) |
208 | { |
209 | if (_IO_file_is_open (fp)) |
210 | { |
211 | _IO_do_flush (fp); |
212 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) |
213 | _IO_SYSCLOSE (fp); |
214 | } |
215 | _IO_default_finish (fp, 0); |
216 | } |
217 | libc_hidden_ver (_IO_new_file_finish, _IO_file_finish) |
218 | |
219 | _IO_FILE * |
220 | _IO_file_open (_IO_FILE *fp, const char *filename, int posix_mode, int prot, |
221 | int read_write, int is32not64) |
222 | { |
223 | int fdesc; |
224 | #ifdef _LIBC |
225 | if (__glibc_unlikely (fp->_flags2 & _IO_FLAGS2_NOTCANCEL)) |
226 | fdesc = open_not_cancel (filename, |
227 | posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot); |
228 | else |
229 | fdesc = open (filename, posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot); |
230 | #else |
231 | fdesc = open (filename, posix_mode, prot); |
232 | #endif |
233 | if (fdesc < 0) |
234 | return NULL; |
235 | fp->_fileno = fdesc; |
236 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
237 | /* For append mode, send the file offset to the end of the file. Don't |
238 | update the offset cache though, since the file handle is not active. */ |
239 | if ((read_write & (_IO_IS_APPENDING | _IO_NO_READS)) |
240 | == (_IO_IS_APPENDING | _IO_NO_READS)) |
241 | { |
242 | _IO_off64_t new_pos = _IO_SYSSEEK (fp, 0, _IO_seek_end); |
243 | if (new_pos == _IO_pos_BAD && errno != ESPIPE) |
244 | { |
245 | close_not_cancel (fdesc); |
246 | return NULL; |
247 | } |
248 | } |
249 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
250 | return fp; |
251 | } |
252 | libc_hidden_def (_IO_file_open) |
253 | |
254 | _IO_FILE * |
255 | _IO_new_file_fopen (_IO_FILE *fp, const char *filename, const char *mode, |
256 | int is32not64) |
257 | { |
258 | int oflags = 0, omode; |
259 | int read_write; |
260 | int oprot = 0666; |
261 | int i; |
262 | _IO_FILE *result; |
263 | #ifdef _LIBC |
264 | const char *cs; |
265 | const char *last_recognized; |
266 | #endif |
267 | |
268 | if (_IO_file_is_open (fp)) |
269 | return 0; |
270 | switch (*mode) |
271 | { |
272 | case 'r': |
273 | omode = O_RDONLY; |
274 | read_write = _IO_NO_WRITES; |
275 | break; |
276 | case 'w': |
277 | omode = O_WRONLY; |
278 | oflags = O_CREAT|O_TRUNC; |
279 | read_write = _IO_NO_READS; |
280 | break; |
281 | case 'a': |
282 | omode = O_WRONLY; |
283 | oflags = O_CREAT|O_APPEND; |
284 | read_write = _IO_NO_READS|_IO_IS_APPENDING; |
285 | break; |
286 | default: |
287 | __set_errno (EINVAL); |
288 | return NULL; |
289 | } |
290 | #ifdef _LIBC |
291 | last_recognized = mode; |
292 | #endif |
293 | for (i = 1; i < 7; ++i) |
294 | { |
295 | switch (*++mode) |
296 | { |
297 | case '\0': |
298 | break; |
299 | case '+': |
300 | omode = O_RDWR; |
301 | read_write &= _IO_IS_APPENDING; |
302 | #ifdef _LIBC |
303 | last_recognized = mode; |
304 | #endif |
305 | continue; |
306 | case 'x': |
307 | oflags |= O_EXCL; |
308 | #ifdef _LIBC |
309 | last_recognized = mode; |
310 | #endif |
311 | continue; |
312 | case 'b': |
313 | #ifdef _LIBC |
314 | last_recognized = mode; |
315 | #endif |
316 | continue; |
317 | case 'm': |
318 | fp->_flags2 |= _IO_FLAGS2_MMAP; |
319 | continue; |
320 | case 'c': |
321 | fp->_flags2 |= _IO_FLAGS2_NOTCANCEL; |
322 | continue; |
323 | case 'e': |
324 | #ifdef O_CLOEXEC |
325 | oflags |= O_CLOEXEC; |
326 | #endif |
327 | fp->_flags2 |= _IO_FLAGS2_CLOEXEC; |
328 | continue; |
329 | default: |
330 | /* Ignore. */ |
331 | continue; |
332 | } |
333 | break; |
334 | } |
335 | |
336 | result = _IO_file_open (fp, filename, omode|oflags, oprot, read_write, |
337 | is32not64); |
338 | |
339 | if (result != NULL) |
340 | { |
341 | #ifndef __ASSUME_O_CLOEXEC |
342 | if ((fp->_flags2 & _IO_FLAGS2_CLOEXEC) != 0 && __have_o_cloexec <= 0) |
343 | { |
344 | int fd = _IO_fileno (fp); |
345 | if (__have_o_cloexec == 0) |
346 | { |
347 | int flags = __fcntl (fd, F_GETFD); |
348 | __have_o_cloexec = (flags & FD_CLOEXEC) == 0 ? -1 : 1; |
349 | } |
350 | if (__have_o_cloexec < 0) |
351 | __fcntl (fd, F_SETFD, FD_CLOEXEC); |
352 | } |
353 | #endif |
354 | |
355 | /* Test whether the mode string specifies the conversion. */ |
356 | cs = strstr (last_recognized + 1, ",ccs=" ); |
357 | if (cs != NULL) |
358 | { |
359 | /* Yep. Load the appropriate conversions and set the orientation |
360 | to wide. */ |
361 | struct gconv_fcts fcts; |
362 | struct _IO_codecvt *cc; |
363 | char *endp = __strchrnul (cs + 5, ','); |
364 | char *ccs = malloc (endp - (cs + 5) + 3); |
365 | |
366 | if (ccs == NULL) |
367 | { |
368 | int malloc_err = errno; /* Whatever malloc failed with. */ |
369 | (void) _IO_file_close_it (fp); |
370 | __set_errno (malloc_err); |
371 | return NULL; |
372 | } |
373 | |
374 | *((char *) __mempcpy (ccs, cs + 5, endp - (cs + 5))) = '\0'; |
375 | strip (ccs, ccs); |
376 | |
377 | if (__wcsmbs_named_conv (&fcts, ccs[2] == '\0' |
378 | ? upstr (ccs, cs + 5) : ccs) != 0) |
379 | { |
380 | /* Something went wrong, we cannot load the conversion modules. |
381 | This means we cannot proceed since the user explicitly asked |
382 | for these. */ |
383 | (void) _IO_file_close_it (fp); |
384 | free (ccs); |
385 | __set_errno (EINVAL); |
386 | return NULL; |
387 | } |
388 | |
389 | free (ccs); |
390 | |
391 | assert (fcts.towc_nsteps == 1); |
392 | assert (fcts.tomb_nsteps == 1); |
393 | |
394 | fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end; |
395 | fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base; |
396 | |
397 | /* Clear the state. We start all over again. */ |
398 | memset (&fp->_wide_data->_IO_state, '\0', sizeof (__mbstate_t)); |
399 | memset (&fp->_wide_data->_IO_last_state, '\0', sizeof (__mbstate_t)); |
400 | |
401 | cc = fp->_codecvt = &fp->_wide_data->_codecvt; |
402 | |
403 | /* The functions are always the same. */ |
404 | *cc = __libio_codecvt; |
405 | |
406 | cc->__cd_in.__cd.__nsteps = fcts.towc_nsteps; |
407 | cc->__cd_in.__cd.__steps = fcts.towc; |
408 | |
409 | cc->__cd_in.__cd.__data[0].__invocation_counter = 0; |
410 | cc->__cd_in.__cd.__data[0].__internal_use = 1; |
411 | cc->__cd_in.__cd.__data[0].__flags = __GCONV_IS_LAST; |
412 | cc->__cd_in.__cd.__data[0].__statep = &result->_wide_data->_IO_state; |
413 | |
414 | cc->__cd_out.__cd.__nsteps = fcts.tomb_nsteps; |
415 | cc->__cd_out.__cd.__steps = fcts.tomb; |
416 | |
417 | cc->__cd_out.__cd.__data[0].__invocation_counter = 0; |
418 | cc->__cd_out.__cd.__data[0].__internal_use = 1; |
419 | cc->__cd_out.__cd.__data[0].__flags |
420 | = __GCONV_IS_LAST | __GCONV_TRANSLIT; |
421 | cc->__cd_out.__cd.__data[0].__statep = |
422 | &result->_wide_data->_IO_state; |
423 | |
424 | /* From now on use the wide character callback functions. */ |
425 | _IO_JUMPS_FILE_plus (fp) = fp->_wide_data->_wide_vtable; |
426 | |
427 | /* Set the mode now. */ |
428 | result->_mode = 1; |
429 | } |
430 | } |
431 | |
432 | return result; |
433 | } |
434 | libc_hidden_ver (_IO_new_file_fopen, _IO_file_fopen) |
435 | |
436 | _IO_FILE * |
437 | _IO_new_file_attach (_IO_FILE *fp, int fd) |
438 | { |
439 | if (_IO_file_is_open (fp)) |
440 | return NULL; |
441 | fp->_fileno = fd; |
442 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); |
443 | fp->_flags |= _IO_DELETE_DONT_CLOSE; |
444 | /* Get the current position of the file. */ |
445 | /* We have to do that since that may be junk. */ |
446 | fp->_offset = _IO_pos_BAD; |
447 | int save_errno = errno; |
448 | if (_IO_SEEKOFF (fp, (_IO_off64_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) |
449 | == _IO_pos_BAD && errno != ESPIPE) |
450 | return NULL; |
451 | __set_errno (save_errno); |
452 | return fp; |
453 | } |
454 | libc_hidden_ver (_IO_new_file_attach, _IO_file_attach) |
455 | |
456 | _IO_FILE * |
457 | _IO_new_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len) |
458 | { |
459 | if (_IO_default_setbuf (fp, p, len) == NULL) |
460 | return NULL; |
461 | |
462 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
463 | = fp->_IO_buf_base; |
464 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
465 | |
466 | return fp; |
467 | } |
468 | libc_hidden_ver (_IO_new_file_setbuf, _IO_file_setbuf) |
469 | |
470 | |
471 | _IO_FILE * |
472 | _IO_file_setbuf_mmap (_IO_FILE *fp, char *p, _IO_ssize_t len) |
473 | { |
474 | _IO_FILE *result; |
475 | |
476 | /* Change the function table. */ |
477 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
478 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
479 | |
480 | /* And perform the normal operation. */ |
481 | result = _IO_new_file_setbuf (fp, p, len); |
482 | |
483 | /* If the call failed, restore to using mmap. */ |
484 | if (result == NULL) |
485 | { |
486 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_mmap; |
487 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap; |
488 | } |
489 | |
490 | return result; |
491 | } |
492 | |
493 | static _IO_size_t new_do_write (_IO_FILE *, const char *, _IO_size_t); |
494 | |
495 | /* Write TO_DO bytes from DATA to FP. |
496 | Then mark FP as having empty buffers. */ |
497 | |
498 | int |
499 | _IO_new_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
500 | { |
501 | return (to_do == 0 |
502 | || (_IO_size_t) new_do_write (fp, data, to_do) == to_do) ? 0 : EOF; |
503 | } |
504 | libc_hidden_ver (_IO_new_do_write, _IO_do_write) |
505 | |
506 | static |
507 | _IO_size_t |
508 | new_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
509 | { |
510 | _IO_size_t count; |
511 | if (fp->_flags & _IO_IS_APPENDING) |
512 | /* On a system without a proper O_APPEND implementation, |
513 | you would need to sys_seek(0, SEEK_END) here, but is |
514 | not needed nor desirable for Unix- or Posix-like systems. |
515 | Instead, just indicate that offset (before and after) is |
516 | unpredictable. */ |
517 | fp->_offset = _IO_pos_BAD; |
518 | else if (fp->_IO_read_end != fp->_IO_write_base) |
519 | { |
520 | _IO_off64_t new_pos |
521 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
522 | if (new_pos == _IO_pos_BAD) |
523 | return 0; |
524 | fp->_offset = new_pos; |
525 | } |
526 | count = _IO_SYSWRITE (fp, data, to_do); |
527 | if (fp->_cur_column && count) |
528 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
529 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
530 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base; |
531 | fp->_IO_write_end = (fp->_mode <= 0 |
532 | && (fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
533 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
534 | return count; |
535 | } |
536 | |
537 | int |
538 | _IO_new_file_underflow (_IO_FILE *fp) |
539 | { |
540 | _IO_ssize_t count; |
541 | #if 0 |
542 | /* SysV does not make this test; take it out for compatibility */ |
543 | if (fp->_flags & _IO_EOF_SEEN) |
544 | return (EOF); |
545 | #endif |
546 | |
547 | if (fp->_flags & _IO_NO_READS) |
548 | { |
549 | fp->_flags |= _IO_ERR_SEEN; |
550 | __set_errno (EBADF); |
551 | return EOF; |
552 | } |
553 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
554 | return *(unsigned char *) fp->_IO_read_ptr; |
555 | |
556 | if (fp->_IO_buf_base == NULL) |
557 | { |
558 | /* Maybe we already have a push back pointer. */ |
559 | if (fp->_IO_save_base != NULL) |
560 | { |
561 | free (fp->_IO_save_base); |
562 | fp->_flags &= ~_IO_IN_BACKUP; |
563 | } |
564 | _IO_doallocbuf (fp); |
565 | } |
566 | |
567 | /* Flush all line buffered files before reading. */ |
568 | /* FIXME This can/should be moved to genops ?? */ |
569 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) |
570 | { |
571 | #if 0 |
572 | _IO_flush_all_linebuffered (); |
573 | #else |
574 | /* We used to flush all line-buffered stream. This really isn't |
575 | required by any standard. My recollection is that |
576 | traditional Unix systems did this for stdout. stderr better |
577 | not be line buffered. So we do just that here |
578 | explicitly. --drepper */ |
579 | _IO_acquire_lock (_IO_stdout); |
580 | |
581 | if ((_IO_stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF)) |
582 | == (_IO_LINKED | _IO_LINE_BUF)) |
583 | _IO_OVERFLOW (_IO_stdout, EOF); |
584 | |
585 | _IO_release_lock (_IO_stdout); |
586 | #endif |
587 | } |
588 | |
589 | _IO_switch_to_get_mode (fp); |
590 | |
591 | /* This is very tricky. We have to adjust those |
592 | pointers before we call _IO_SYSREAD () since |
593 | we may longjump () out while waiting for |
594 | input. Those pointers may be screwed up. H.J. */ |
595 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; |
596 | fp->_IO_read_end = fp->_IO_buf_base; |
597 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
598 | = fp->_IO_buf_base; |
599 | |
600 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
601 | fp->_IO_buf_end - fp->_IO_buf_base); |
602 | if (count <= 0) |
603 | { |
604 | if (count == 0) |
605 | fp->_flags |= _IO_EOF_SEEN; |
606 | else |
607 | fp->_flags |= _IO_ERR_SEEN, count = 0; |
608 | } |
609 | fp->_IO_read_end += count; |
610 | if (count == 0) |
611 | { |
612 | /* If a stream is read to EOF, the calling application may switch active |
613 | handles. As a result, our offset cache would no longer be valid, so |
614 | unset it. */ |
615 | fp->_offset = _IO_pos_BAD; |
616 | return EOF; |
617 | } |
618 | if (fp->_offset != _IO_pos_BAD) |
619 | _IO_pos_adjust (fp->_offset, count); |
620 | return *(unsigned char *) fp->_IO_read_ptr; |
621 | } |
622 | libc_hidden_ver (_IO_new_file_underflow, _IO_file_underflow) |
623 | |
624 | /* Guts of underflow callback if we mmap the file. This stats the file and |
625 | updates the stream state to match. In the normal case we return zero. |
626 | If the file is no longer eligible for mmap, its jump tables are reset to |
627 | the vanilla ones and we return nonzero. */ |
628 | static int |
629 | mmap_remap_check (_IO_FILE *fp) |
630 | { |
631 | struct stat64 st; |
632 | |
633 | if (_IO_SYSSTAT (fp, &st) == 0 |
634 | && S_ISREG (st.st_mode) && st.st_size != 0 |
635 | /* Limit the file size to 1MB for 32-bit machines. */ |
636 | && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024)) |
637 | { |
638 | const size_t pagesize = __getpagesize (); |
639 | # define ROUNDED(x) (((x) + pagesize - 1) & ~(pagesize - 1)) |
640 | if (ROUNDED (st.st_size) < ROUNDED (fp->_IO_buf_end |
641 | - fp->_IO_buf_base)) |
642 | { |
643 | /* We can trim off some pages past the end of the file. */ |
644 | (void) __munmap (fp->_IO_buf_base + ROUNDED (st.st_size), |
645 | ROUNDED (fp->_IO_buf_end - fp->_IO_buf_base) |
646 | - ROUNDED (st.st_size)); |
647 | fp->_IO_buf_end = fp->_IO_buf_base + st.st_size; |
648 | } |
649 | else if (ROUNDED (st.st_size) > ROUNDED (fp->_IO_buf_end |
650 | - fp->_IO_buf_base)) |
651 | { |
652 | /* The file added some pages. We need to remap it. */ |
653 | void *p; |
654 | #ifdef _G_HAVE_MREMAP |
655 | p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end |
656 | - fp->_IO_buf_base), |
657 | ROUNDED (st.st_size), MREMAP_MAYMOVE); |
658 | if (p == MAP_FAILED) |
659 | { |
660 | (void) __munmap (fp->_IO_buf_base, |
661 | fp->_IO_buf_end - fp->_IO_buf_base); |
662 | goto punt; |
663 | } |
664 | #else |
665 | (void) __munmap (fp->_IO_buf_base, |
666 | fp->_IO_buf_end - fp->_IO_buf_base); |
667 | p = __mmap64 (NULL, st.st_size, PROT_READ, MAP_SHARED, |
668 | fp->_fileno, 0); |
669 | if (p == MAP_FAILED) |
670 | goto punt; |
671 | #endif |
672 | fp->_IO_buf_base = p; |
673 | fp->_IO_buf_end = fp->_IO_buf_base + st.st_size; |
674 | } |
675 | else |
676 | { |
677 | /* The number of pages didn't change. */ |
678 | fp->_IO_buf_end = fp->_IO_buf_base + st.st_size; |
679 | } |
680 | # undef ROUNDED |
681 | |
682 | fp->_offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
683 | _IO_setg (fp, fp->_IO_buf_base, |
684 | fp->_offset < fp->_IO_buf_end - fp->_IO_buf_base |
685 | ? fp->_IO_buf_base + fp->_offset : fp->_IO_buf_end, |
686 | fp->_IO_buf_end); |
687 | |
688 | /* If we are already positioned at or past the end of the file, don't |
689 | change the current offset. If not, seek past what we have mapped, |
690 | mimicking the position left by a normal underflow reading into its |
691 | buffer until EOF. */ |
692 | |
693 | if (fp->_offset < fp->_IO_buf_end - fp->_IO_buf_base) |
694 | { |
695 | if (__lseek64 (fp->_fileno, fp->_IO_buf_end - fp->_IO_buf_base, |
696 | SEEK_SET) |
697 | != fp->_IO_buf_end - fp->_IO_buf_base) |
698 | fp->_flags |= _IO_ERR_SEEN; |
699 | else |
700 | fp->_offset = fp->_IO_buf_end - fp->_IO_buf_base; |
701 | } |
702 | |
703 | return 0; |
704 | } |
705 | else |
706 | { |
707 | /* Life is no longer good for mmap. Punt it. */ |
708 | (void) __munmap (fp->_IO_buf_base, |
709 | fp->_IO_buf_end - fp->_IO_buf_base); |
710 | punt: |
711 | fp->_IO_buf_base = fp->_IO_buf_end = NULL; |
712 | _IO_setg (fp, NULL, NULL, NULL); |
713 | if (fp->_mode <= 0) |
714 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
715 | else |
716 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps; |
717 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
718 | |
719 | return 1; |
720 | } |
721 | } |
722 | |
723 | /* Special callback replacing the underflow callbacks if we mmap the file. */ |
724 | int |
725 | _IO_file_underflow_mmap (_IO_FILE *fp) |
726 | { |
727 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
728 | return *(unsigned char *) fp->_IO_read_ptr; |
729 | |
730 | if (__glibc_unlikely (mmap_remap_check (fp))) |
731 | /* We punted to the regular file functions. */ |
732 | return _IO_UNDERFLOW (fp); |
733 | |
734 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
735 | return *(unsigned char *) fp->_IO_read_ptr; |
736 | |
737 | fp->_flags |= _IO_EOF_SEEN; |
738 | return EOF; |
739 | } |
740 | |
741 | static void |
742 | decide_maybe_mmap (_IO_FILE *fp) |
743 | { |
744 | /* We use the file in read-only mode. This could mean we can |
745 | mmap the file and use it without any copying. But not all |
746 | file descriptors are for mmap-able objects and on 32-bit |
747 | machines we don't want to map files which are too large since |
748 | this would require too much virtual memory. */ |
749 | struct stat64 st; |
750 | |
751 | if (_IO_SYSSTAT (fp, &st) == 0 |
752 | && S_ISREG (st.st_mode) && st.st_size != 0 |
753 | /* Limit the file size to 1MB for 32-bit machines. */ |
754 | && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024) |
755 | /* Sanity check. */ |
756 | && (fp->_offset == _IO_pos_BAD || fp->_offset <= st.st_size)) |
757 | { |
758 | /* Try to map the file. */ |
759 | void *p; |
760 | |
761 | p = __mmap64 (NULL, st.st_size, PROT_READ, MAP_SHARED, fp->_fileno, 0); |
762 | if (p != MAP_FAILED) |
763 | { |
764 | /* OK, we managed to map the file. Set the buffer up and use a |
765 | special jump table with simplified underflow functions which |
766 | never tries to read anything from the file. */ |
767 | |
768 | if (__lseek64 (fp->_fileno, st.st_size, SEEK_SET) != st.st_size) |
769 | { |
770 | (void) __munmap (p, st.st_size); |
771 | fp->_offset = _IO_pos_BAD; |
772 | } |
773 | else |
774 | { |
775 | _IO_setb (fp, p, (char *) p + st.st_size, 0); |
776 | |
777 | if (fp->_offset == _IO_pos_BAD) |
778 | fp->_offset = 0; |
779 | |
780 | _IO_setg (fp, p, p + fp->_offset, p + st.st_size); |
781 | fp->_offset = st.st_size; |
782 | |
783 | if (fp->_mode <= 0) |
784 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_mmap; |
785 | else |
786 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps_mmap; |
787 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap; |
788 | |
789 | return; |
790 | } |
791 | } |
792 | } |
793 | |
794 | /* We couldn't use mmap, so revert to the vanilla file operations. */ |
795 | |
796 | if (fp->_mode <= 0) |
797 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
798 | else |
799 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps; |
800 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
801 | } |
802 | |
803 | int |
804 | _IO_file_underflow_maybe_mmap (_IO_FILE *fp) |
805 | { |
806 | /* This is the first read attempt. Choose mmap or vanilla operations |
807 | and then punt to the chosen underflow routine. */ |
808 | decide_maybe_mmap (fp); |
809 | return _IO_UNDERFLOW (fp); |
810 | } |
811 | |
812 | |
813 | int |
814 | _IO_new_file_overflow (_IO_FILE *f, int ch) |
815 | { |
816 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ |
817 | { |
818 | f->_flags |= _IO_ERR_SEEN; |
819 | __set_errno (EBADF); |
820 | return EOF; |
821 | } |
822 | /* If currently reading or no buffer allocated. */ |
823 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0 || f->_IO_write_base == NULL) |
824 | { |
825 | /* Allocate a buffer if needed. */ |
826 | if (f->_IO_write_base == NULL) |
827 | { |
828 | _IO_doallocbuf (f); |
829 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); |
830 | } |
831 | /* Otherwise must be currently reading. |
832 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, |
833 | logically slide the buffer forwards one block (by setting the |
834 | read pointers to all point at the beginning of the block). This |
835 | makes room for subsequent output. |
836 | Otherwise, set the read pointers to _IO_read_end (leaving that |
837 | alone, so it can continue to correspond to the external position). */ |
838 | if (__glibc_unlikely (_IO_in_backup (f))) |
839 | { |
840 | size_t nbackup = f->_IO_read_end - f->_IO_read_ptr; |
841 | _IO_free_backup_area (f); |
842 | f->_IO_read_base -= MIN (nbackup, |
843 | f->_IO_read_base - f->_IO_buf_base); |
844 | f->_IO_read_ptr = f->_IO_read_base; |
845 | } |
846 | |
847 | if (f->_IO_read_ptr == f->_IO_buf_end) |
848 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; |
849 | f->_IO_write_ptr = f->_IO_read_ptr; |
850 | f->_IO_write_base = f->_IO_write_ptr; |
851 | f->_IO_write_end = f->_IO_buf_end; |
852 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; |
853 | |
854 | f->_flags |= _IO_CURRENTLY_PUTTING; |
855 | if (f->_mode <= 0 && f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
856 | f->_IO_write_end = f->_IO_write_ptr; |
857 | } |
858 | if (ch == EOF) |
859 | return _IO_do_write (f, f->_IO_write_base, |
860 | f->_IO_write_ptr - f->_IO_write_base); |
861 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
862 | if (_IO_do_flush (f) == EOF) |
863 | return EOF; |
864 | *f->_IO_write_ptr++ = ch; |
865 | if ((f->_flags & _IO_UNBUFFERED) |
866 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) |
867 | if (_IO_do_write (f, f->_IO_write_base, |
868 | f->_IO_write_ptr - f->_IO_write_base) == EOF) |
869 | return EOF; |
870 | return (unsigned char) ch; |
871 | } |
872 | libc_hidden_ver (_IO_new_file_overflow, _IO_file_overflow) |
873 | |
874 | int |
875 | _IO_new_file_sync (_IO_FILE *fp) |
876 | { |
877 | _IO_ssize_t delta; |
878 | int retval = 0; |
879 | |
880 | /* char* ptr = cur_ptr(); */ |
881 | if (fp->_IO_write_ptr > fp->_IO_write_base) |
882 | if (_IO_do_flush(fp)) return EOF; |
883 | delta = fp->_IO_read_ptr - fp->_IO_read_end; |
884 | if (delta != 0) |
885 | { |
886 | #ifdef TODO |
887 | if (_IO_in_backup (fp)) |
888 | delta -= eGptr () - Gbase (); |
889 | #endif |
890 | _IO_off64_t new_pos = _IO_SYSSEEK (fp, delta, 1); |
891 | if (new_pos != (_IO_off64_t) EOF) |
892 | fp->_IO_read_end = fp->_IO_read_ptr; |
893 | #ifdef ESPIPE |
894 | else if (errno == ESPIPE) |
895 | ; /* Ignore error from unseekable devices. */ |
896 | #endif |
897 | else |
898 | retval = EOF; |
899 | } |
900 | if (retval != EOF) |
901 | fp->_offset = _IO_pos_BAD; |
902 | /* FIXME: Cleanup - can this be shared? */ |
903 | /* setg(base(), ptr, ptr); */ |
904 | return retval; |
905 | } |
906 | libc_hidden_ver (_IO_new_file_sync, _IO_file_sync) |
907 | |
908 | static int |
909 | _IO_file_sync_mmap (_IO_FILE *fp) |
910 | { |
911 | if (fp->_IO_read_ptr != fp->_IO_read_end) |
912 | { |
913 | #ifdef TODO |
914 | if (_IO_in_backup (fp)) |
915 | delta -= eGptr () - Gbase (); |
916 | #endif |
917 | if (__lseek64 (fp->_fileno, fp->_IO_read_ptr - fp->_IO_buf_base, |
918 | SEEK_SET) |
919 | != fp->_IO_read_ptr - fp->_IO_buf_base) |
920 | { |
921 | fp->_flags |= _IO_ERR_SEEN; |
922 | return EOF; |
923 | } |
924 | } |
925 | fp->_offset = fp->_IO_read_ptr - fp->_IO_buf_base; |
926 | fp->_IO_read_end = fp->_IO_read_ptr = fp->_IO_read_base; |
927 | return 0; |
928 | } |
929 | |
930 | /* ftell{,o} implementation. The only time we modify the state of the stream |
931 | is when we have unflushed writes. In that case we seek to the end and |
932 | record that offset in the stream object. */ |
933 | static _IO_off64_t |
934 | do_ftell (_IO_FILE *fp) |
935 | { |
936 | _IO_off64_t result, offset = 0; |
937 | |
938 | /* No point looking at unflushed data if we haven't allocated buffers |
939 | yet. */ |
940 | if (fp->_IO_buf_base != NULL) |
941 | { |
942 | bool unflushed_writes = fp->_IO_write_ptr > fp->_IO_write_base; |
943 | |
944 | bool append_mode = (fp->_flags & _IO_IS_APPENDING) == _IO_IS_APPENDING; |
945 | |
946 | /* When we have unflushed writes in append mode, seek to the end of the |
947 | file and record that offset. This is the only time we change the file |
948 | stream state and it is safe since the file handle is active. */ |
949 | if (unflushed_writes && append_mode) |
950 | { |
951 | result = _IO_SYSSEEK (fp, 0, _IO_seek_end); |
952 | if (result == _IO_pos_BAD) |
953 | return EOF; |
954 | else |
955 | fp->_offset = result; |
956 | } |
957 | |
958 | /* Adjust for unflushed data. */ |
959 | if (!unflushed_writes) |
960 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
961 | /* We don't trust _IO_read_end to represent the current file offset when |
962 | writing in append mode because the value would have to be shifted to |
963 | the end of the file during a flush. Use the write base instead, along |
964 | with the new offset we got above when we did a seek to the end of the |
965 | file. */ |
966 | else if (append_mode) |
967 | offset += fp->_IO_write_ptr - fp->_IO_write_base; |
968 | /* For all other modes, _IO_read_end represents the file offset. */ |
969 | else |
970 | offset += fp->_IO_write_ptr - fp->_IO_read_end; |
971 | } |
972 | |
973 | if (fp->_offset != _IO_pos_BAD) |
974 | result = fp->_offset; |
975 | else |
976 | result = _IO_SYSSEEK (fp, 0, _IO_seek_cur); |
977 | |
978 | if (result == EOF) |
979 | return result; |
980 | |
981 | result += offset; |
982 | |
983 | if (result < 0) |
984 | { |
985 | __set_errno (EINVAL); |
986 | return EOF; |
987 | } |
988 | |
989 | return result; |
990 | } |
991 | |
992 | _IO_off64_t |
993 | _IO_new_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
994 | { |
995 | _IO_off64_t result; |
996 | _IO_off64_t delta, new_offset; |
997 | long count; |
998 | |
999 | /* Short-circuit into a separate function. We don't want to mix any |
1000 | functionality and we don't want to touch anything inside the FILE |
1001 | object. */ |
1002 | if (mode == 0) |
1003 | return do_ftell (fp); |
1004 | |
1005 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file |
1006 | offset of the underlying file must be exact. */ |
1007 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end |
1008 | && fp->_IO_write_base == fp->_IO_write_ptr); |
1009 | |
1010 | bool was_writing = (fp->_IO_write_ptr > fp->_IO_write_base |
1011 | || _IO_in_put_mode (fp)); |
1012 | |
1013 | /* Flush unwritten characters. |
1014 | (This may do an unneeded write if we seek within the buffer. |
1015 | But to be able to switch to reading, we would need to set |
1016 | egptr to pptr. That can't be done in the current design, |
1017 | which assumes file_ptr() is eGptr. Anyway, since we probably |
1018 | end up flushing when we close(), it doesn't make much difference.) |
1019 | FIXME: simulate mem-mapped files. */ |
1020 | if (was_writing && _IO_switch_to_get_mode (fp)) |
1021 | return EOF; |
1022 | |
1023 | if (fp->_IO_buf_base == NULL) |
1024 | { |
1025 | /* It could be that we already have a pushback buffer. */ |
1026 | if (fp->_IO_read_base != NULL) |
1027 | { |
1028 | free (fp->_IO_read_base); |
1029 | fp->_flags &= ~_IO_IN_BACKUP; |
1030 | } |
1031 | _IO_doallocbuf (fp); |
1032 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
1033 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
1034 | } |
1035 | |
1036 | switch (dir) |
1037 | { |
1038 | case _IO_seek_cur: |
1039 | /* Adjust for read-ahead (bytes is buffer). */ |
1040 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
1041 | |
1042 | if (fp->_offset == _IO_pos_BAD) |
1043 | goto dumb; |
1044 | /* Make offset absolute, assuming current pointer is file_ptr(). */ |
1045 | offset += fp->_offset; |
1046 | if (offset < 0) |
1047 | { |
1048 | __set_errno (EINVAL); |
1049 | return EOF; |
1050 | } |
1051 | |
1052 | dir = _IO_seek_set; |
1053 | break; |
1054 | case _IO_seek_set: |
1055 | break; |
1056 | case _IO_seek_end: |
1057 | { |
1058 | struct stat64 st; |
1059 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) |
1060 | { |
1061 | offset += st.st_size; |
1062 | dir = _IO_seek_set; |
1063 | } |
1064 | else |
1065 | goto dumb; |
1066 | } |
1067 | } |
1068 | /* At this point, dir==_IO_seek_set. */ |
1069 | |
1070 | /* If destination is within current buffer, optimize: */ |
1071 | if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL |
1072 | && !_IO_in_backup (fp)) |
1073 | { |
1074 | _IO_off64_t start_offset = (fp->_offset |
1075 | - (fp->_IO_read_end - fp->_IO_buf_base)); |
1076 | if (offset >= start_offset && offset < fp->_offset) |
1077 | { |
1078 | _IO_setg (fp, fp->_IO_buf_base, |
1079 | fp->_IO_buf_base + (offset - start_offset), |
1080 | fp->_IO_read_end); |
1081 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
1082 | |
1083 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
1084 | goto resync; |
1085 | } |
1086 | } |
1087 | |
1088 | if (fp->_flags & _IO_NO_READS) |
1089 | goto dumb; |
1090 | |
1091 | /* Try to seek to a block boundary, to improve kernel page management. */ |
1092 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); |
1093 | delta = offset - new_offset; |
1094 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) |
1095 | { |
1096 | new_offset = offset; |
1097 | delta = 0; |
1098 | } |
1099 | result = _IO_SYSSEEK (fp, new_offset, 0); |
1100 | if (result < 0) |
1101 | return EOF; |
1102 | if (delta == 0) |
1103 | count = 0; |
1104 | else |
1105 | { |
1106 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
1107 | (must_be_exact |
1108 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); |
1109 | if (count < delta) |
1110 | { |
1111 | /* We weren't allowed to read, but try to seek the remainder. */ |
1112 | offset = count == EOF ? delta : delta-count; |
1113 | dir = _IO_seek_cur; |
1114 | goto dumb; |
1115 | } |
1116 | } |
1117 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, |
1118 | fp->_IO_buf_base + count); |
1119 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
1120 | fp->_offset = result + count; |
1121 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
1122 | return offset; |
1123 | dumb: |
1124 | |
1125 | _IO_unsave_markers (fp); |
1126 | result = _IO_SYSSEEK (fp, offset, dir); |
1127 | if (result != EOF) |
1128 | { |
1129 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
1130 | fp->_offset = result; |
1131 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
1132 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
1133 | } |
1134 | return result; |
1135 | |
1136 | resync: |
1137 | /* We need to do it since it is possible that the file offset in |
1138 | the kernel may be changed behind our back. It may happen when |
1139 | we fopen a file and then do a fork. One process may access the |
1140 | file and the kernel file offset will be changed. */ |
1141 | if (fp->_offset >= 0) |
1142 | _IO_SYSSEEK (fp, fp->_offset, 0); |
1143 | |
1144 | return offset; |
1145 | } |
1146 | libc_hidden_ver (_IO_new_file_seekoff, _IO_file_seekoff) |
1147 | |
1148 | _IO_off64_t |
1149 | _IO_file_seekoff_mmap (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
1150 | { |
1151 | _IO_off64_t result; |
1152 | |
1153 | /* If we are only interested in the current position, calculate it and |
1154 | return right now. This calculation does the right thing when we are |
1155 | using a pushback buffer, but in the usual case has the same value as |
1156 | (fp->_IO_read_ptr - fp->_IO_buf_base). */ |
1157 | if (mode == 0) |
1158 | return fp->_offset - (fp->_IO_read_end - fp->_IO_read_ptr); |
1159 | |
1160 | switch (dir) |
1161 | { |
1162 | case _IO_seek_cur: |
1163 | /* Adjust for read-ahead (bytes is buffer). */ |
1164 | offset += fp->_IO_read_ptr - fp->_IO_read_base; |
1165 | break; |
1166 | case _IO_seek_set: |
1167 | break; |
1168 | case _IO_seek_end: |
1169 | offset += fp->_IO_buf_end - fp->_IO_buf_base; |
1170 | break; |
1171 | } |
1172 | /* At this point, dir==_IO_seek_set. */ |
1173 | |
1174 | if (offset < 0) |
1175 | { |
1176 | /* No negative offsets are valid. */ |
1177 | __set_errno (EINVAL); |
1178 | return EOF; |
1179 | } |
1180 | |
1181 | result = _IO_SYSSEEK (fp, offset, 0); |
1182 | if (result < 0) |
1183 | return EOF; |
1184 | |
1185 | if (offset > fp->_IO_buf_end - fp->_IO_buf_base) |
1186 | /* One can fseek arbitrarily past the end of the file |
1187 | and it is meaningless until one attempts to read. |
1188 | Leave the buffer pointers in EOF state until underflow. */ |
1189 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_end, fp->_IO_buf_end); |
1190 | else |
1191 | /* Adjust the read pointers to match the file position, |
1192 | but so the next read attempt will call underflow. */ |
1193 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + offset, |
1194 | fp->_IO_buf_base + offset); |
1195 | |
1196 | fp->_offset = result; |
1197 | |
1198 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
1199 | |
1200 | return offset; |
1201 | } |
1202 | |
1203 | static _IO_off64_t |
1204 | _IO_file_seekoff_maybe_mmap (_IO_FILE *fp, _IO_off64_t offset, int dir, |
1205 | int mode) |
1206 | { |
1207 | /* We only get here when we haven't tried to read anything yet. |
1208 | So there is nothing more useful for us to do here than just |
1209 | the underlying lseek call. */ |
1210 | |
1211 | _IO_off64_t result = _IO_SYSSEEK (fp, offset, dir); |
1212 | if (result < 0) |
1213 | return EOF; |
1214 | |
1215 | fp->_offset = result; |
1216 | return result; |
1217 | } |
1218 | |
1219 | _IO_ssize_t |
1220 | _IO_file_read (_IO_FILE *fp, void *buf, _IO_ssize_t size) |
1221 | { |
1222 | return (__builtin_expect (fp->_flags2 & _IO_FLAGS2_NOTCANCEL, 0) |
1223 | ? read_not_cancel (fp->_fileno, buf, size) |
1224 | : read (fp->_fileno, buf, size)); |
1225 | } |
1226 | libc_hidden_def (_IO_file_read) |
1227 | |
1228 | _IO_off64_t |
1229 | _IO_file_seek (_IO_FILE *fp, _IO_off64_t offset, int dir) |
1230 | { |
1231 | return __lseek64 (fp->_fileno, offset, dir); |
1232 | } |
1233 | libc_hidden_def (_IO_file_seek) |
1234 | |
1235 | int |
1236 | _IO_file_stat (_IO_FILE *fp, void *st) |
1237 | { |
1238 | return __fxstat64 (_STAT_VER, fp->_fileno, (struct stat64 *) st); |
1239 | } |
1240 | libc_hidden_def (_IO_file_stat) |
1241 | |
1242 | int |
1243 | _IO_file_close_mmap (_IO_FILE *fp) |
1244 | { |
1245 | /* In addition to closing the file descriptor we have to unmap the file. */ |
1246 | (void) __munmap (fp->_IO_buf_base, fp->_IO_buf_end - fp->_IO_buf_base); |
1247 | fp->_IO_buf_base = fp->_IO_buf_end = NULL; |
1248 | /* Cancelling close should be avoided if possible since it leaves an |
1249 | unrecoverable state behind. */ |
1250 | return close_not_cancel (fp->_fileno); |
1251 | } |
1252 | |
1253 | int |
1254 | _IO_file_close (_IO_FILE *fp) |
1255 | { |
1256 | /* Cancelling close should be avoided if possible since it leaves an |
1257 | unrecoverable state behind. */ |
1258 | return close_not_cancel (fp->_fileno); |
1259 | } |
1260 | libc_hidden_def (_IO_file_close) |
1261 | |
1262 | _IO_ssize_t |
1263 | _IO_new_file_write (_IO_FILE *f, const void *data, _IO_ssize_t n) |
1264 | { |
1265 | _IO_ssize_t to_do = n; |
1266 | while (to_do > 0) |
1267 | { |
1268 | _IO_ssize_t count = (__builtin_expect (f->_flags2 |
1269 | & _IO_FLAGS2_NOTCANCEL, 0) |
1270 | ? write_not_cancel (f->_fileno, data, to_do) |
1271 | : write (f->_fileno, data, to_do)); |
1272 | if (count < 0) |
1273 | { |
1274 | f->_flags |= _IO_ERR_SEEN; |
1275 | break; |
1276 | } |
1277 | to_do -= count; |
1278 | data = (void *) ((char *) data + count); |
1279 | } |
1280 | n -= to_do; |
1281 | if (f->_offset >= 0) |
1282 | f->_offset += n; |
1283 | return n; |
1284 | } |
1285 | |
1286 | _IO_size_t |
1287 | _IO_new_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n) |
1288 | { |
1289 | const char *s = (const char *) data; |
1290 | _IO_size_t to_do = n; |
1291 | int must_flush = 0; |
1292 | _IO_size_t count = 0; |
1293 | |
1294 | if (n <= 0) |
1295 | return 0; |
1296 | /* This is an optimized implementation. |
1297 | If the amount to be written straddles a block boundary |
1298 | (or the filebuf is unbuffered), use sys_write directly. */ |
1299 | |
1300 | /* First figure out how much space is available in the buffer. */ |
1301 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) |
1302 | { |
1303 | count = f->_IO_buf_end - f->_IO_write_ptr; |
1304 | if (count >= n) |
1305 | { |
1306 | const char *p; |
1307 | for (p = s + n; p > s; ) |
1308 | { |
1309 | if (*--p == '\n') |
1310 | { |
1311 | count = p - s + 1; |
1312 | must_flush = 1; |
1313 | break; |
1314 | } |
1315 | } |
1316 | } |
1317 | } |
1318 | else if (f->_IO_write_end > f->_IO_write_ptr) |
1319 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ |
1320 | |
1321 | /* Then fill the buffer. */ |
1322 | if (count > 0) |
1323 | { |
1324 | if (count > to_do) |
1325 | count = to_do; |
1326 | #ifdef _LIBC |
1327 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
1328 | #else |
1329 | memcpy (f->_IO_write_ptr, s, count); |
1330 | f->_IO_write_ptr += count; |
1331 | #endif |
1332 | s += count; |
1333 | to_do -= count; |
1334 | } |
1335 | if (to_do + must_flush > 0) |
1336 | { |
1337 | _IO_size_t block_size, do_write; |
1338 | /* Next flush the (full) buffer. */ |
1339 | if (_IO_OVERFLOW (f, EOF) == EOF) |
1340 | /* If nothing else has to be written we must not signal the |
1341 | caller that everything has been written. */ |
1342 | return to_do == 0 ? EOF : n - to_do; |
1343 | |
1344 | /* Try to maintain alignment: write a whole number of blocks. */ |
1345 | block_size = f->_IO_buf_end - f->_IO_buf_base; |
1346 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
1347 | |
1348 | if (do_write) |
1349 | { |
1350 | count = new_do_write (f, s, do_write); |
1351 | to_do -= count; |
1352 | if (count < do_write) |
1353 | return n - to_do; |
1354 | } |
1355 | |
1356 | /* Now write out the remainder. Normally, this will fit in the |
1357 | buffer, but it's somewhat messier for line-buffered files, |
1358 | so we let _IO_default_xsputn handle the general case. */ |
1359 | if (to_do) |
1360 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
1361 | } |
1362 | return n - to_do; |
1363 | } |
1364 | libc_hidden_ver (_IO_new_file_xsputn, _IO_file_xsputn) |
1365 | |
1366 | _IO_size_t |
1367 | _IO_file_xsgetn (_IO_FILE *fp, void *data, _IO_size_t n) |
1368 | { |
1369 | _IO_size_t want, have; |
1370 | _IO_ssize_t count; |
1371 | char *s = data; |
1372 | |
1373 | want = n; |
1374 | |
1375 | if (fp->_IO_buf_base == NULL) |
1376 | { |
1377 | /* Maybe we already have a push back pointer. */ |
1378 | if (fp->_IO_save_base != NULL) |
1379 | { |
1380 | free (fp->_IO_save_base); |
1381 | fp->_flags &= ~_IO_IN_BACKUP; |
1382 | } |
1383 | _IO_doallocbuf (fp); |
1384 | } |
1385 | |
1386 | while (want > 0) |
1387 | { |
1388 | have = fp->_IO_read_end - fp->_IO_read_ptr; |
1389 | if (want <= have) |
1390 | { |
1391 | memcpy (s, fp->_IO_read_ptr, want); |
1392 | fp->_IO_read_ptr += want; |
1393 | want = 0; |
1394 | } |
1395 | else |
1396 | { |
1397 | if (have > 0) |
1398 | { |
1399 | #ifdef _LIBC |
1400 | s = __mempcpy (s, fp->_IO_read_ptr, have); |
1401 | #else |
1402 | memcpy (s, fp->_IO_read_ptr, have); |
1403 | s += have; |
1404 | #endif |
1405 | want -= have; |
1406 | fp->_IO_read_ptr += have; |
1407 | } |
1408 | |
1409 | /* Check for backup and repeat */ |
1410 | if (_IO_in_backup (fp)) |
1411 | { |
1412 | _IO_switch_to_main_get_area (fp); |
1413 | continue; |
1414 | } |
1415 | |
1416 | /* If we now want less than a buffer, underflow and repeat |
1417 | the copy. Otherwise, _IO_SYSREAD directly to |
1418 | the user buffer. */ |
1419 | if (fp->_IO_buf_base |
1420 | && want < (size_t) (fp->_IO_buf_end - fp->_IO_buf_base)) |
1421 | { |
1422 | if (__underflow (fp) == EOF) |
1423 | break; |
1424 | |
1425 | continue; |
1426 | } |
1427 | |
1428 | /* These must be set before the sysread as we might longjmp out |
1429 | waiting for input. */ |
1430 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
1431 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
1432 | |
1433 | /* Try to maintain alignment: read a whole number of blocks. */ |
1434 | count = want; |
1435 | if (fp->_IO_buf_base) |
1436 | { |
1437 | _IO_size_t block_size = fp->_IO_buf_end - fp->_IO_buf_base; |
1438 | if (block_size >= 128) |
1439 | count -= want % block_size; |
1440 | } |
1441 | |
1442 | count = _IO_SYSREAD (fp, s, count); |
1443 | if (count <= 0) |
1444 | { |
1445 | if (count == 0) |
1446 | fp->_flags |= _IO_EOF_SEEN; |
1447 | else |
1448 | fp->_flags |= _IO_ERR_SEEN; |
1449 | |
1450 | break; |
1451 | } |
1452 | |
1453 | s += count; |
1454 | want -= count; |
1455 | if (fp->_offset != _IO_pos_BAD) |
1456 | _IO_pos_adjust (fp->_offset, count); |
1457 | } |
1458 | } |
1459 | |
1460 | return n - want; |
1461 | } |
1462 | libc_hidden_def (_IO_file_xsgetn) |
1463 | |
1464 | static _IO_size_t |
1465 | _IO_file_xsgetn_mmap (_IO_FILE *fp, void *data, _IO_size_t n) |
1466 | { |
1467 | _IO_size_t have; |
1468 | char *read_ptr = fp->_IO_read_ptr; |
1469 | char *s = (char *) data; |
1470 | |
1471 | have = fp->_IO_read_end - fp->_IO_read_ptr; |
1472 | |
1473 | if (have < n) |
1474 | { |
1475 | if (__glibc_unlikely (_IO_in_backup (fp))) |
1476 | { |
1477 | #ifdef _LIBC |
1478 | s = __mempcpy (s, read_ptr, have); |
1479 | #else |
1480 | memcpy (s, read_ptr, have); |
1481 | s += have; |
1482 | #endif |
1483 | n -= have; |
1484 | _IO_switch_to_main_get_area (fp); |
1485 | read_ptr = fp->_IO_read_ptr; |
1486 | have = fp->_IO_read_end - fp->_IO_read_ptr; |
1487 | } |
1488 | |
1489 | if (have < n) |
1490 | { |
1491 | /* Check that we are mapping all of the file, in case it grew. */ |
1492 | if (__glibc_unlikely (mmap_remap_check (fp))) |
1493 | /* We punted mmap, so complete with the vanilla code. */ |
1494 | return s - (char *) data + _IO_XSGETN (fp, data, n); |
1495 | |
1496 | read_ptr = fp->_IO_read_ptr; |
1497 | have = fp->_IO_read_end - read_ptr; |
1498 | } |
1499 | } |
1500 | |
1501 | if (have < n) |
1502 | fp->_flags |= _IO_EOF_SEEN; |
1503 | |
1504 | if (have != 0) |
1505 | { |
1506 | have = MIN (have, n); |
1507 | #ifdef _LIBC |
1508 | s = __mempcpy (s, read_ptr, have); |
1509 | #else |
1510 | memcpy (s, read_ptr, have); |
1511 | s += have; |
1512 | #endif |
1513 | fp->_IO_read_ptr = read_ptr + have; |
1514 | } |
1515 | |
1516 | return s - (char *) data; |
1517 | } |
1518 | |
1519 | static _IO_size_t |
1520 | _IO_file_xsgetn_maybe_mmap (_IO_FILE *fp, void *data, _IO_size_t n) |
1521 | { |
1522 | /* We only get here if this is the first attempt to read something. |
1523 | Decide which operations to use and then punt to the chosen one. */ |
1524 | |
1525 | decide_maybe_mmap (fp); |
1526 | return _IO_XSGETN (fp, data, n); |
1527 | } |
1528 | |
1529 | #ifdef _LIBC |
1530 | versioned_symbol (libc, _IO_new_do_write, _IO_do_write, GLIBC_2_1); |
1531 | versioned_symbol (libc, _IO_new_file_attach, _IO_file_attach, GLIBC_2_1); |
1532 | versioned_symbol (libc, _IO_new_file_close_it, _IO_file_close_it, GLIBC_2_1); |
1533 | versioned_symbol (libc, _IO_new_file_finish, _IO_file_finish, GLIBC_2_1); |
1534 | versioned_symbol (libc, _IO_new_file_fopen, _IO_file_fopen, GLIBC_2_1); |
1535 | versioned_symbol (libc, _IO_new_file_init, _IO_file_init, GLIBC_2_1); |
1536 | versioned_symbol (libc, _IO_new_file_setbuf, _IO_file_setbuf, GLIBC_2_1); |
1537 | versioned_symbol (libc, _IO_new_file_sync, _IO_file_sync, GLIBC_2_1); |
1538 | versioned_symbol (libc, _IO_new_file_overflow, _IO_file_overflow, GLIBC_2_1); |
1539 | versioned_symbol (libc, _IO_new_file_seekoff, _IO_file_seekoff, GLIBC_2_1); |
1540 | versioned_symbol (libc, _IO_new_file_underflow, _IO_file_underflow, GLIBC_2_1); |
1541 | versioned_symbol (libc, _IO_new_file_write, _IO_file_write, GLIBC_2_1); |
1542 | versioned_symbol (libc, _IO_new_file_xsputn, _IO_file_xsputn, GLIBC_2_1); |
1543 | #endif |
1544 | |
1545 | const struct _IO_jump_t _IO_file_jumps libio_vtable = |
1546 | { |
1547 | JUMP_INIT_DUMMY, |
1548 | JUMP_INIT(finish, _IO_file_finish), |
1549 | JUMP_INIT(overflow, _IO_file_overflow), |
1550 | JUMP_INIT(underflow, _IO_file_underflow), |
1551 | JUMP_INIT(uflow, _IO_default_uflow), |
1552 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
1553 | JUMP_INIT(xsputn, _IO_file_xsputn), |
1554 | JUMP_INIT(xsgetn, _IO_file_xsgetn), |
1555 | JUMP_INIT(seekoff, _IO_new_file_seekoff), |
1556 | JUMP_INIT(seekpos, _IO_default_seekpos), |
1557 | JUMP_INIT(setbuf, _IO_new_file_setbuf), |
1558 | JUMP_INIT(sync, _IO_new_file_sync), |
1559 | JUMP_INIT(doallocate, _IO_file_doallocate), |
1560 | JUMP_INIT(read, _IO_file_read), |
1561 | JUMP_INIT(write, _IO_new_file_write), |
1562 | JUMP_INIT(seek, _IO_file_seek), |
1563 | JUMP_INIT(close, _IO_file_close), |
1564 | JUMP_INIT(stat, _IO_file_stat), |
1565 | JUMP_INIT(showmanyc, _IO_default_showmanyc), |
1566 | JUMP_INIT(imbue, _IO_default_imbue) |
1567 | }; |
1568 | libc_hidden_data_def (_IO_file_jumps) |
1569 | |
1570 | const struct _IO_jump_t _IO_file_jumps_mmap libio_vtable = |
1571 | { |
1572 | JUMP_INIT_DUMMY, |
1573 | JUMP_INIT(finish, _IO_file_finish), |
1574 | JUMP_INIT(overflow, _IO_file_overflow), |
1575 | JUMP_INIT(underflow, _IO_file_underflow_mmap), |
1576 | JUMP_INIT(uflow, _IO_default_uflow), |
1577 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
1578 | JUMP_INIT(xsputn, _IO_new_file_xsputn), |
1579 | JUMP_INIT(xsgetn, _IO_file_xsgetn_mmap), |
1580 | JUMP_INIT(seekoff, _IO_file_seekoff_mmap), |
1581 | JUMP_INIT(seekpos, _IO_default_seekpos), |
1582 | JUMP_INIT(setbuf, (_IO_setbuf_t) _IO_file_setbuf_mmap), |
1583 | JUMP_INIT(sync, _IO_file_sync_mmap), |
1584 | JUMP_INIT(doallocate, _IO_file_doallocate), |
1585 | JUMP_INIT(read, _IO_file_read), |
1586 | JUMP_INIT(write, _IO_new_file_write), |
1587 | JUMP_INIT(seek, _IO_file_seek), |
1588 | JUMP_INIT(close, _IO_file_close_mmap), |
1589 | JUMP_INIT(stat, _IO_file_stat), |
1590 | JUMP_INIT(showmanyc, _IO_default_showmanyc), |
1591 | JUMP_INIT(imbue, _IO_default_imbue) |
1592 | }; |
1593 | |
1594 | const struct _IO_jump_t _IO_file_jumps_maybe_mmap libio_vtable = |
1595 | { |
1596 | JUMP_INIT_DUMMY, |
1597 | JUMP_INIT(finish, _IO_file_finish), |
1598 | JUMP_INIT(overflow, _IO_file_overflow), |
1599 | JUMP_INIT(underflow, _IO_file_underflow_maybe_mmap), |
1600 | JUMP_INIT(uflow, _IO_default_uflow), |
1601 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
1602 | JUMP_INIT(xsputn, _IO_new_file_xsputn), |
1603 | JUMP_INIT(xsgetn, _IO_file_xsgetn_maybe_mmap), |
1604 | JUMP_INIT(seekoff, _IO_file_seekoff_maybe_mmap), |
1605 | JUMP_INIT(seekpos, _IO_default_seekpos), |
1606 | JUMP_INIT(setbuf, (_IO_setbuf_t) _IO_file_setbuf_mmap), |
1607 | JUMP_INIT(sync, _IO_new_file_sync), |
1608 | JUMP_INIT(doallocate, _IO_file_doallocate), |
1609 | JUMP_INIT(read, _IO_file_read), |
1610 | JUMP_INIT(write, _IO_new_file_write), |
1611 | JUMP_INIT(seek, _IO_file_seek), |
1612 | JUMP_INIT(close, _IO_file_close), |
1613 | JUMP_INIT(stat, _IO_file_stat), |
1614 | JUMP_INIT(showmanyc, _IO_default_showmanyc), |
1615 | JUMP_INIT(imbue, _IO_default_imbue) |
1616 | }; |
1617 | |