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9402cc59 NA |
1 | /* CTF archive files. |
2 | Copyright (C) 2019 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of libctf. | |
5 | ||
6 | libctf is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
14 | See the GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; see the file COPYING. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <ctf-impl.h> | |
21 | #include <sys/types.h> | |
22 | #include <sys/stat.h> | |
23 | #include <elf.h> | |
a0486bac | 24 | #include "ctf-endian.h" |
9402cc59 NA |
25 | #include <errno.h> |
26 | #include <fcntl.h> | |
27 | #include <stdio.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
31 | #ifdef HAVE_MMAP | |
32 | #include <sys/mman.h> | |
33 | #endif | |
34 | ||
35 | static off_t arc_write_one_ctf (ctf_file_t * f, int fd, size_t threshold); | |
36 | static ctf_file_t *ctf_arc_open_by_offset (const struct ctf_archive *arc, | |
37 | const ctf_sect_t *symsect, | |
38 | const ctf_sect_t *strsect, | |
39 | size_t offset, int *errp); | |
40 | static int sort_modent_by_name (const void *one, const void *two, void *n); | |
41 | static void *arc_mmap_header (int fd, size_t headersz); | |
42 | static void *arc_mmap_file (int fd, size_t size); | |
43 | static int arc_mmap_writeout (int fd, void *header, size_t headersz, | |
44 | const char **errmsg); | |
45 | static int arc_mmap_unmap (void *header, size_t headersz, const char **errmsg); | |
46 | ||
47 | /* bsearch() internal state. */ | |
48 | static __thread char *search_nametbl; | |
49 | ||
5537f9b9 NA |
50 | /* Write out a CTF archive to the start of the file referenced by the passed-in |
51 | fd. The entries in CTF_FILES are referenced by name: the names are passed in | |
52 | the names array, which must have CTF_FILES entries. | |
9402cc59 NA |
53 | |
54 | Returns 0 on success, or an errno, or an ECTF_* value. */ | |
55 | int | |
5537f9b9 NA |
56 | ctf_arc_write_fd (int fd, ctf_file_t **ctf_files, size_t ctf_file_cnt, |
57 | const char **names, size_t threshold) | |
9402cc59 NA |
58 | { |
59 | const char *errmsg; | |
60 | struct ctf_archive *archdr; | |
9402cc59 NA |
61 | size_t i; |
62 | char dummy = 0; | |
63 | size_t headersz; | |
64 | ssize_t namesz; | |
65 | size_t ctf_startoffs; /* Start of the section we are working over. */ | |
66 | char *nametbl = NULL; /* The name table. */ | |
67 | char *np; | |
68 | off_t nameoffs; | |
69 | struct ctf_archive_modent *modent; | |
70 | ||
5537f9b9 | 71 | ctf_dprintf ("Writing CTF archive with %lu files\n", |
62d8e3b7 | 72 | (unsigned long) ctf_file_cnt); |
9402cc59 | 73 | |
9402cc59 NA |
74 | /* Figure out the size of the mmap()ed header, including the |
75 | ctf_archive_modent array. We assume that all of this needs no | |
76 | padding: a likely assumption, given that it's all made up of | |
77 | uint64_t's. */ | |
78 | headersz = sizeof (struct ctf_archive) | |
79 | + (ctf_file_cnt * sizeof (uint64_t) * 2); | |
62d8e3b7 | 80 | ctf_dprintf ("headersz is %lu\n", (unsigned long) headersz); |
9402cc59 NA |
81 | |
82 | /* From now on we work in two pieces: an mmap()ed region from zero up to the | |
83 | headersz, and a region updated via write() starting after that, containing | |
84 | all the tables. Platforms that do not support mmap() just use write(). */ | |
85 | ctf_startoffs = headersz; | |
86 | if (lseek (fd, ctf_startoffs - 1, SEEK_SET) < 0) | |
87 | { | |
5537f9b9 NA |
88 | errmsg = "ctf_arc_write(): cannot extend file while writing: %s\n"; |
89 | goto err; | |
9402cc59 NA |
90 | } |
91 | ||
92 | if (write (fd, &dummy, 1) < 0) | |
93 | { | |
5537f9b9 NA |
94 | errmsg = "ctf_arc_write(): cannot extend file while writing: %s\n"; |
95 | goto err; | |
9402cc59 NA |
96 | } |
97 | ||
98 | if ((archdr = arc_mmap_header (fd, headersz)) == NULL) | |
99 | { | |
5537f9b9 NA |
100 | errmsg = "ctf_arc_write(): Cannot mmap(): %s\n"; |
101 | goto err; | |
9402cc59 NA |
102 | } |
103 | ||
104 | /* Fill in everything we can, which is everything other than the name | |
105 | table offset. */ | |
106 | archdr->ctfa_magic = htole64 (CTFA_MAGIC); | |
107 | archdr->ctfa_nfiles = htole64 (ctf_file_cnt); | |
108 | archdr->ctfa_ctfs = htole64 (ctf_startoffs); | |
109 | ||
110 | /* We could validate that all CTF files have the same data model, but | |
111 | since any reasonable construction process will be building things of | |
112 | only one bitness anyway, this is pretty pointless, so just use the | |
113 | model of the first CTF file for all of them. (It *is* valid to | |
114 | create an empty archive: the value of ctfa_model is irrelevant in | |
115 | this case, but we must be sure not to dereference uninitialized | |
116 | memory.) */ | |
117 | ||
118 | if (ctf_file_cnt > 0) | |
119 | archdr->ctfa_model = htole64 (ctf_getmodel (ctf_files[0])); | |
120 | ||
121 | /* Now write out the CTFs: ctf_archive_modent array via the mapping, | |
122 | ctfs via write(). The names themselves have not been written yet: we | |
123 | track them in a local strtab until the time is right, and sort the | |
124 | modents array after construction. | |
125 | ||
126 | The name table is not sorted. */ | |
127 | ||
128 | for (i = 0, namesz = 0; i < le64toh (archdr->ctfa_nfiles); i++) | |
129 | namesz += strlen (names[i]) + 1; | |
130 | ||
131 | nametbl = malloc (namesz); | |
132 | if (nametbl == NULL) | |
133 | { | |
5537f9b9 | 134 | errmsg = "Error writing named CTF to archive: %s\n"; |
9402cc59 NA |
135 | goto err_unmap; |
136 | } | |
137 | ||
138 | for (i = 0, namesz = 0, | |
139 | modent = (ctf_archive_modent_t *) ((char *) archdr | |
140 | + sizeof (struct ctf_archive)); | |
141 | i < le64toh (archdr->ctfa_nfiles); i++) | |
142 | { | |
143 | off_t off; | |
144 | ||
145 | strcpy (&nametbl[namesz], names[i]); | |
146 | ||
147 | off = arc_write_one_ctf (ctf_files[i], fd, threshold); | |
9402cc59 NA |
148 | if ((off < 0) && (off > -ECTF_BASE)) |
149 | { | |
150 | errmsg = "ctf_arc_write(): Cannot determine file " | |
5537f9b9 | 151 | "position while writing to archive: %s"; |
9402cc59 NA |
152 | goto err_free; |
153 | } | |
154 | if (off < 0) | |
155 | { | |
5537f9b9 | 156 | errmsg = "ctf_arc_write(): Cannot write CTF file to archive: %s\n"; |
9402cc59 NA |
157 | errno = off * -1; |
158 | goto err_free; | |
159 | } | |
160 | ||
161 | modent->name_offset = htole64 (namesz); | |
162 | modent->ctf_offset = htole64 (off - ctf_startoffs); | |
163 | namesz += strlen (names[i]) + 1; | |
164 | modent++; | |
165 | } | |
166 | ||
6b22174f NA |
167 | ctf_qsort_r ((ctf_archive_modent_t *) ((char *) archdr |
168 | + sizeof (struct ctf_archive)), | |
169 | le64toh (archdr->ctfa_nfiles), | |
170 | sizeof (struct ctf_archive_modent), sort_modent_by_name, | |
171 | nametbl); | |
9402cc59 NA |
172 | |
173 | /* Now the name table. */ | |
174 | ||
175 | if ((nameoffs = lseek (fd, 0, SEEK_CUR)) < 0) | |
176 | { | |
177 | errmsg = "ctf_arc_write(): Cannot get current file position " | |
5537f9b9 | 178 | "in archive: %s\n"; |
9402cc59 NA |
179 | goto err_free; |
180 | } | |
181 | archdr->ctfa_names = htole64 (nameoffs); | |
182 | np = nametbl; | |
183 | while (namesz > 0) | |
184 | { | |
185 | ssize_t len; | |
186 | if ((len = write (fd, np, namesz)) < 0) | |
187 | { | |
5537f9b9 | 188 | errmsg = "ctf_arc_write(): Cannot write name table to archive: %s\n"; |
9402cc59 NA |
189 | goto err_free; |
190 | } | |
191 | namesz -= len; | |
192 | np += len; | |
193 | } | |
194 | free (nametbl); | |
195 | ||
196 | if (arc_mmap_writeout (fd, archdr, headersz, &errmsg) < 0) | |
197 | goto err_unmap; | |
198 | if (arc_mmap_unmap (archdr, headersz, &errmsg) < 0) | |
5537f9b9 | 199 | goto err; |
9402cc59 NA |
200 | return 0; |
201 | ||
202 | err_free: | |
203 | free (nametbl); | |
204 | err_unmap: | |
205 | arc_mmap_unmap (archdr, headersz, NULL); | |
9402cc59 | 206 | err: |
5537f9b9 | 207 | ctf_dprintf (errmsg, errno < ECTF_BASE ? strerror (errno) : |
9402cc59 NA |
208 | ctf_errmsg (errno)); |
209 | return errno; | |
210 | } | |
211 | ||
5537f9b9 NA |
212 | /* Write out a CTF archive. The entries in CTF_FILES are referenced by name: |
213 | the names are passed in the names array, which must have CTF_FILES entries. | |
214 | ||
215 | If the filename is NULL, create a temporary file and return a pointer to it. | |
216 | ||
217 | Returns 0 on success, or an errno, or an ECTF_* value. */ | |
218 | int | |
219 | ctf_arc_write (const char *file, ctf_file_t ** ctf_files, size_t ctf_file_cnt, | |
220 | const char **names, size_t threshold) | |
221 | { | |
222 | int err; | |
223 | int fd; | |
224 | ||
225 | if ((fd = open (file, O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0666)) < 0) | |
226 | { | |
227 | ctf_dprintf ("ctf_arc_write(): cannot create %s: %s\n", file, | |
228 | strerror (errno)); | |
229 | return errno; | |
230 | } | |
231 | ||
232 | err = ctf_arc_write_fd (fd, ctf_files, ctf_file_cnt, names, threshold); | |
233 | if (err) | |
234 | goto err; | |
235 | ||
236 | if ((err = close (fd)) < 0) | |
237 | { | |
238 | ctf_dprintf ("ctf_arc_write(): Cannot close after writing to archive: " | |
239 | "%s\n", strerror (errno)); | |
240 | goto err_close; | |
241 | } | |
242 | ||
243 | err: | |
244 | close (fd); | |
245 | if (err < 0) | |
246 | unlink (file); | |
247 | ||
248 | return err; | |
249 | ||
250 | err_close: | |
251 | if (err < 0) | |
252 | unlink (file); | |
253 | ||
254 | return err; | |
255 | } | |
256 | ||
9402cc59 NA |
257 | /* Write one CTF file out. Return the file position of the written file (or |
258 | rather, of the file-size uint64_t that precedes it): negative return is a | |
259 | negative errno or ctf_errno value. On error, the file position may no longer | |
260 | be at the end of the file. */ | |
261 | static off_t | |
262 | arc_write_one_ctf (ctf_file_t * f, int fd, size_t threshold) | |
263 | { | |
264 | off_t off, end_off; | |
265 | uint64_t ctfsz = 0; | |
266 | char *ctfszp; | |
267 | size_t ctfsz_len; | |
268 | int (*writefn) (ctf_file_t * fp, int fd); | |
269 | ||
270 | if ((off = lseek (fd, 0, SEEK_CUR)) < 0) | |
271 | return errno * -1; | |
272 | ||
273 | if (f->ctf_size > threshold) | |
274 | writefn = ctf_compress_write; | |
275 | else | |
276 | writefn = ctf_write; | |
277 | ||
278 | /* This zero-write turns into the size in a moment. */ | |
279 | ctfsz_len = sizeof (ctfsz); | |
280 | ctfszp = (char *) &ctfsz; | |
281 | while (ctfsz_len > 0) | |
282 | { | |
283 | ssize_t writelen = write (fd, ctfszp, ctfsz_len); | |
284 | if (writelen < 0) | |
285 | return errno * -1; | |
286 | ctfsz_len -= writelen; | |
287 | ctfszp += writelen; | |
288 | } | |
289 | ||
290 | if (writefn (f, fd) != 0) | |
291 | return f->ctf_errno * -1; | |
292 | ||
293 | if ((end_off = lseek (fd, 0, SEEK_CUR)) < 0) | |
294 | return errno * -1; | |
295 | ctfsz = htole64 (end_off - off); | |
296 | ||
297 | if ((lseek (fd, off, SEEK_SET)) < 0) | |
298 | return errno * -1; | |
299 | ||
300 | /* ... here. */ | |
301 | ctfsz_len = sizeof (ctfsz); | |
302 | ctfszp = (char *) &ctfsz; | |
303 | while (ctfsz_len > 0) | |
304 | { | |
305 | ssize_t writelen = write (fd, ctfszp, ctfsz_len); | |
306 | if (writelen < 0) | |
307 | return errno * -1; | |
308 | ctfsz_len -= writelen; | |
309 | ctfszp += writelen; | |
310 | } | |
311 | ||
312 | end_off = LCTF_ALIGN_OFFS (end_off, 8); | |
313 | if ((lseek (fd, end_off, SEEK_SET)) < 0) | |
314 | return errno * -1; | |
315 | ||
316 | return off; | |
317 | } | |
318 | ||
319 | /* qsort() function to sort the array of struct ctf_archive_modents into | |
320 | ascending name order. */ | |
321 | static int | |
322 | sort_modent_by_name (const void *one, const void *two, void *n) | |
323 | { | |
324 | const struct ctf_archive_modent *a = one; | |
325 | const struct ctf_archive_modent *b = two; | |
326 | char *nametbl = n; | |
327 | ||
328 | return strcmp (&nametbl[le64toh (a->name_offset)], | |
329 | &nametbl[le64toh (b->name_offset)]); | |
330 | } | |
331 | ||
332 | /* bsearch() function to search for a given name in the sorted array of struct | |
333 | ctf_archive_modents. */ | |
334 | static int | |
335 | search_modent_by_name (const void *key, const void *ent) | |
336 | { | |
337 | const char *k = key; | |
338 | const struct ctf_archive_modent *v = ent; | |
339 | ||
340 | return strcmp (k, &search_nametbl[le64toh (v->name_offset)]); | |
341 | } | |
342 | ||
343 | /* A trivial wrapper: open a CTF archive, from data in a buffer (which the | |
344 | caller must preserve until ctf_arc_close() time). Returns the archive, or | |
345 | NULL and an error in *err (if not NULL). */ | |
346 | struct ctf_archive * | |
347 | ctf_arc_bufopen (const void *buf, size_t size _libctf_unused_, int *errp) | |
348 | { | |
349 | struct ctf_archive *arc = (struct ctf_archive *) buf; | |
350 | ||
351 | if (le64toh (arc->ctfa_magic) != CTFA_MAGIC) | |
352 | { | |
353 | if (errp) | |
354 | *errp = ECTF_FMT; | |
355 | return NULL; | |
356 | } | |
357 | return arc; | |
358 | } | |
359 | ||
360 | /* Open a CTF archive. Returns the archive, or NULL and an error in *err (if | |
361 | not NULL). */ | |
362 | struct ctf_archive * | |
363 | ctf_arc_open_internal (const char *filename, int *errp) | |
364 | { | |
365 | const char *errmsg; | |
366 | int fd; | |
367 | struct stat s; | |
368 | struct ctf_archive *arc; /* (Actually the whole file.) */ | |
369 | ||
370 | libctf_init_debug(); | |
371 | if ((fd = open (filename, O_RDONLY)) < 0) | |
372 | { | |
373 | errmsg = "ctf_arc_open(): cannot open %s: %s\n"; | |
374 | goto err; | |
375 | } | |
376 | if (fstat (fd, &s) < 0) | |
377 | { | |
378 | errmsg = "ctf_arc_open(): cannot stat %s: %s\n"; | |
379 | goto err_close; | |
380 | } | |
381 | ||
382 | if ((arc = arc_mmap_file (fd, s.st_size)) == NULL) | |
383 | { | |
384 | errmsg = "ctf_arc_open(): Cannot read in %s: %s\n"; | |
385 | goto err_close; | |
386 | } | |
387 | ||
388 | if (le64toh (arc->ctfa_magic) != CTFA_MAGIC) | |
389 | { | |
390 | errmsg = "ctf_arc_open(): Invalid magic number"; | |
391 | errno = ECTF_FMT; | |
392 | goto err_unmap; | |
393 | } | |
394 | ||
395 | /* This horrible hack lets us know how much to unmap when the file is | |
396 | closed. (We no longer need the magic number, and the mapping | |
397 | is private.) */ | |
398 | arc->ctfa_magic = s.st_size; | |
399 | close (fd); | |
400 | return arc; | |
401 | ||
402 | err_unmap: | |
403 | arc_mmap_unmap (arc, s.st_size, NULL); | |
404 | err_close: | |
405 | close (fd); | |
406 | err: | |
407 | if (errp) | |
408 | *errp = errno; | |
409 | ctf_dprintf (errmsg, filename, errno < ECTF_BASE ? strerror (errno) : | |
410 | ctf_errmsg (errno)); | |
411 | return NULL; | |
412 | } | |
413 | ||
414 | /* Close an archive. */ | |
415 | void | |
416 | ctf_arc_close_internal (struct ctf_archive *arc) | |
417 | { | |
418 | if (arc == NULL) | |
419 | return; | |
420 | ||
421 | /* See the comment in ctf_arc_open(). */ | |
422 | arc_mmap_unmap (arc, arc->ctfa_magic, NULL); | |
423 | } | |
424 | ||
425 | /* Public entry point: close an archive, or CTF file. */ | |
426 | void | |
427 | ctf_arc_close (ctf_archive_t *arc) | |
428 | { | |
429 | if (arc == NULL) | |
430 | return; | |
431 | ||
432 | if (arc->ctfi_is_archive) | |
433 | ctf_arc_close_internal (arc->ctfi_archive); | |
434 | else | |
435 | ctf_file_close (arc->ctfi_file); | |
436 | free ((void *) arc->ctfi_symsect.cts_data); | |
6d5944fc | 437 | /* Do not free the ctfi_strsect: it is bound to the bfd. */ |
9402cc59 NA |
438 | free (arc->ctfi_data); |
439 | free (arc); | |
440 | } | |
441 | ||
442 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
443 | non-NULL. A name of NULL means to open the default file. */ | |
444 | static ctf_file_t * | |
445 | ctf_arc_open_by_name_internal (const struct ctf_archive *arc, | |
446 | const ctf_sect_t *symsect, | |
447 | const ctf_sect_t *strsect, | |
448 | const char *name, int *errp) | |
449 | { | |
450 | struct ctf_archive_modent *modent; | |
451 | ||
452 | if (name == NULL) | |
453 | name = _CTF_SECTION; /* The default name. */ | |
454 | ||
455 | ctf_dprintf ("ctf_arc_open_by_name(%s): opening\n", name); | |
456 | ||
457 | modent = (ctf_archive_modent_t *) ((char *) arc | |
458 | + sizeof (struct ctf_archive)); | |
459 | ||
460 | search_nametbl = (char *) arc + le64toh (arc->ctfa_names); | |
461 | modent = bsearch (name, modent, le64toh (arc->ctfa_nfiles), | |
462 | sizeof (struct ctf_archive_modent), | |
463 | search_modent_by_name); | |
464 | ||
465 | /* This is actually a common case and normal operation: no error | |
466 | debug output. */ | |
467 | if (modent == NULL) | |
468 | { | |
469 | if (errp) | |
470 | *errp = ECTF_ARNNAME; | |
471 | return NULL; | |
472 | } | |
473 | ||
474 | return ctf_arc_open_by_offset (arc, symsect, strsect, | |
475 | le64toh (modent->ctf_offset), errp); | |
476 | } | |
477 | ||
478 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
479 | non-NULL. A name of NULL means to open the default file. | |
480 | ||
481 | Use the specified string and symbol table sections. | |
482 | ||
483 | Public entry point. */ | |
484 | ctf_file_t * | |
485 | ctf_arc_open_by_name_sections (const ctf_archive_t *arc, | |
486 | const ctf_sect_t *symsect, | |
487 | const ctf_sect_t *strsect, | |
488 | const char *name, | |
489 | int *errp) | |
490 | { | |
491 | if (arc->ctfi_is_archive) | |
492 | { | |
493 | ctf_file_t *ret; | |
494 | ret = ctf_arc_open_by_name_internal (arc->ctfi_archive, symsect, strsect, | |
495 | name, errp); | |
496 | if (ret) | |
497 | ret->ctf_archive = (ctf_archive_t *) arc; | |
498 | return ret; | |
499 | } | |
500 | ||
501 | if ((name != NULL) && (strcmp (name, _CTF_SECTION) != 0)) | |
502 | { | |
503 | if (errp) | |
504 | *errp = ECTF_ARNNAME; | |
505 | return NULL; | |
506 | } | |
507 | arc->ctfi_file->ctf_archive = (ctf_archive_t *) arc; | |
508 | ||
509 | /* Bump the refcount so that the user can ctf_file_close() it. */ | |
510 | arc->ctfi_file->ctf_refcnt++; | |
511 | return arc->ctfi_file; | |
512 | } | |
513 | ||
514 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
515 | non-NULL. A name of NULL means to open the default file. | |
516 | ||
517 | Public entry point. */ | |
518 | ctf_file_t * | |
519 | ctf_arc_open_by_name (const ctf_archive_t *arc, const char *name, int *errp) | |
520 | { | |
521 | const ctf_sect_t *symsect = &arc->ctfi_symsect; | |
522 | const ctf_sect_t *strsect = &arc->ctfi_strsect; | |
523 | ||
524 | if (symsect->cts_name == NULL) | |
525 | symsect = NULL; | |
526 | if (strsect->cts_name == NULL) | |
527 | strsect = NULL; | |
528 | ||
529 | return ctf_arc_open_by_name_sections (arc, symsect, strsect, name, errp); | |
530 | } | |
531 | ||
532 | /* Return the ctf_file_t at the given ctfa_ctfs-relative offset, or NULL if | |
533 | none, setting 'err' if non-NULL. */ | |
534 | static ctf_file_t * | |
535 | ctf_arc_open_by_offset (const struct ctf_archive *arc, | |
536 | const ctf_sect_t *symsect, | |
537 | const ctf_sect_t *strsect, size_t offset, | |
538 | int *errp) | |
539 | { | |
540 | ctf_sect_t ctfsect; | |
541 | ctf_file_t *fp; | |
542 | ||
62d8e3b7 | 543 | ctf_dprintf ("ctf_arc_open_by_offset(%lu): opening\n", (unsigned long) offset); |
9402cc59 | 544 | |
a0486bac | 545 | memset (&ctfsect, 0, sizeof (ctf_sect_t)); |
9402cc59 NA |
546 | |
547 | offset += le64toh (arc->ctfa_ctfs); | |
548 | ||
549 | ctfsect.cts_name = _CTF_SECTION; | |
9402cc59 NA |
550 | ctfsect.cts_size = le64toh (*((uint64_t *) ((char *) arc + offset))); |
551 | ctfsect.cts_entsize = 1; | |
9402cc59 NA |
552 | ctfsect.cts_data = (void *) ((char *) arc + offset + sizeof (uint64_t)); |
553 | fp = ctf_bufopen (&ctfsect, symsect, strsect, errp); | |
554 | if (fp) | |
555 | ctf_setmodel (fp, le64toh (arc->ctfa_model)); | |
556 | return fp; | |
557 | } | |
558 | ||
559 | /* Raw iteration over all CTF files in an archive. We pass the raw data for all | |
560 | CTF files in turn to the specified callback function. */ | |
561 | static int | |
562 | ctf_archive_raw_iter_internal (const struct ctf_archive *arc, | |
563 | ctf_archive_raw_member_f *func, void *data) | |
564 | { | |
565 | int rc; | |
566 | size_t i; | |
567 | struct ctf_archive_modent *modent; | |
568 | const char *nametbl; | |
569 | ||
570 | modent = (ctf_archive_modent_t *) ((char *) arc | |
571 | + sizeof (struct ctf_archive)); | |
572 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); | |
573 | ||
574 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) | |
575 | { | |
576 | const char *name; | |
577 | char *fp; | |
578 | ||
579 | name = &nametbl[le64toh (modent[i].name_offset)]; | |
580 | fp = ((char *) arc + le64toh (arc->ctfa_ctfs) | |
581 | + le64toh (modent[i].ctf_offset)); | |
582 | ||
583 | if ((rc = func (name, (void *) (fp + sizeof (uint64_t)), | |
584 | le64toh (*((uint64_t *) fp)), data)) != 0) | |
585 | return rc; | |
586 | } | |
587 | return 0; | |
588 | } | |
589 | ||
590 | /* Raw iteration over all CTF files in an archive: public entry point. | |
591 | ||
592 | Returns -EINVAL if not supported for this sort of archive. */ | |
593 | int | |
594 | ctf_archive_raw_iter (const ctf_archive_t *arc, | |
595 | ctf_archive_raw_member_f * func, void *data) | |
596 | { | |
597 | if (arc->ctfi_is_archive) | |
598 | return ctf_archive_raw_iter_internal (arc->ctfi_archive, func, data); | |
599 | ||
600 | return -EINVAL; /* Not supported. */ | |
601 | } | |
602 | ||
603 | /* Iterate over all CTF files in an archive. We pass all CTF files in turn to | |
604 | the specified callback function. */ | |
605 | static int | |
606 | ctf_archive_iter_internal (const ctf_archive_t *wrapper, | |
607 | const struct ctf_archive *arc, | |
608 | const ctf_sect_t *symsect, | |
609 | const ctf_sect_t *strsect, | |
610 | ctf_archive_member_f *func, void *data) | |
611 | { | |
612 | int rc; | |
613 | size_t i; | |
614 | ctf_file_t *f; | |
615 | struct ctf_archive_modent *modent; | |
616 | const char *nametbl; | |
617 | ||
618 | modent = (ctf_archive_modent_t *) ((char *) arc | |
619 | + sizeof (struct ctf_archive)); | |
620 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); | |
621 | ||
622 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) | |
623 | { | |
624 | const char *name; | |
625 | ||
626 | name = &nametbl[le64toh (modent[i].name_offset)]; | |
627 | if ((f = ctf_arc_open_by_name_internal (arc, symsect, strsect, | |
628 | name, &rc)) == NULL) | |
629 | return rc; | |
630 | ||
631 | f->ctf_archive = (ctf_archive_t *) wrapper; | |
632 | if ((rc = func (f, name, data)) != 0) | |
633 | { | |
634 | ctf_file_close (f); | |
635 | return rc; | |
636 | } | |
637 | ||
638 | ctf_file_close (f); | |
639 | } | |
640 | return 0; | |
641 | } | |
642 | ||
643 | /* Iterate over all CTF files in an archive: public entry point. We pass all | |
644 | CTF files in turn to the specified callback function. */ | |
645 | int | |
646 | ctf_archive_iter (const ctf_archive_t *arc, ctf_archive_member_f *func, | |
647 | void *data) | |
648 | { | |
649 | const ctf_sect_t *symsect = &arc->ctfi_symsect; | |
650 | const ctf_sect_t *strsect = &arc->ctfi_strsect; | |
651 | ||
652 | if (symsect->cts_name == NULL) | |
653 | symsect = NULL; | |
654 | if (strsect->cts_name == NULL) | |
655 | strsect = NULL; | |
656 | ||
657 | if (arc->ctfi_is_archive) | |
658 | return ctf_archive_iter_internal (arc, arc->ctfi_archive, symsect, strsect, | |
659 | func, data); | |
660 | ||
661 | return func (arc->ctfi_file, _CTF_SECTION, data); | |
662 | } | |
663 | ||
664 | #ifdef HAVE_MMAP | |
665 | /* Map the header in. Only used on new, empty files. */ | |
666 | static void *arc_mmap_header (int fd, size_t headersz) | |
667 | { | |
668 | void *hdr; | |
669 | if ((hdr = mmap (NULL, headersz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, | |
670 | 0)) == MAP_FAILED) | |
671 | return NULL; | |
672 | return hdr; | |
673 | } | |
674 | ||
675 | /* mmap() the whole file, for reading only. (Map it writably, but privately: we | |
676 | need to modify the region, but don't need anyone else to see the | |
677 | modifications.) */ | |
678 | static void *arc_mmap_file (int fd, size_t size) | |
679 | { | |
680 | void *arc; | |
681 | if ((arc = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, | |
682 | fd, 0)) == MAP_FAILED) | |
683 | return NULL; | |
684 | return arc; | |
685 | } | |
686 | ||
687 | /* Persist the header to disk. */ | |
688 | static int arc_mmap_writeout (int fd _libctf_unused_, void *header, | |
689 | size_t headersz, const char **errmsg) | |
690 | { | |
691 | if (msync (header, headersz, MS_ASYNC) < 0) | |
692 | { | |
693 | if (errmsg) | |
694 | *errmsg = "arc_mmap_writeout(): Cannot sync after writing to %s: %s\n"; | |
695 | return -1; | |
696 | } | |
697 | return 0; | |
698 | } | |
699 | ||
700 | /* Unmap the region. */ | |
701 | static int arc_mmap_unmap (void *header, size_t headersz, const char **errmsg) | |
702 | { | |
703 | if (munmap (header, headersz) < 0) | |
704 | { | |
705 | if (errmsg) | |
706 | *errmsg = "arc_mmap_munmap(): Cannot unmap after writing to %s: %s\n"; | |
707 | return -1; | |
708 | } | |
709 | return 0; | |
710 | } | |
711 | #else | |
712 | /* Map the header in. Only used on new, empty files. */ | |
f5e73be1 | 713 | static void *arc_mmap_header (int fd _libctf_unused_, size_t headersz) |
9402cc59 NA |
714 | { |
715 | void *hdr; | |
716 | if ((hdr = malloc (headersz)) == NULL) | |
717 | return NULL; | |
718 | return hdr; | |
719 | } | |
720 | ||
721 | /* Pull in the whole file, for reading only. We assume the current file | |
722 | position is at the start of the file. */ | |
723 | static void *arc_mmap_file (int fd, size_t size) | |
724 | { | |
725 | char *data; | |
726 | ||
727 | if ((data = malloc (size)) == NULL) | |
728 | return NULL; | |
729 | ||
730 | if (ctf_pread (fd, data, size, 0) < 0) | |
731 | { | |
732 | free (data); | |
733 | return NULL; | |
734 | } | |
735 | return data; | |
736 | } | |
737 | ||
738 | /* Persist the header to disk. */ | |
739 | static int arc_mmap_writeout (int fd, void *header, size_t headersz, | |
740 | const char **errmsg) | |
741 | { | |
742 | ssize_t len; | |
743 | size_t acc = 0; | |
744 | char *data = (char *) header; | |
745 | ssize_t count = headersz; | |
746 | ||
747 | if ((lseek (fd, 0, SEEK_SET)) < 0) | |
748 | { | |
749 | if (errmsg) | |
750 | *errmsg = "arc_mmap_writeout(): Cannot seek while writing header to " | |
751 | "%s: %s\n"; | |
752 | return -1; | |
753 | } | |
754 | ||
755 | while (headersz > 0) | |
756 | { | |
757 | if ((len = write (fd, data, count)) < 0) | |
758 | { | |
759 | if (errmsg) | |
760 | *errmsg = "arc_mmap_writeout(): Cannot write header to %s: %s\n"; | |
761 | return len; | |
762 | } | |
763 | if (len == EINTR) | |
764 | continue; | |
765 | ||
766 | acc += len; | |
767 | if (len == 0) /* EOF. */ | |
768 | break; | |
769 | ||
770 | count -= len; | |
771 | data += len; | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | ||
776 | /* Unmap the region. */ | |
777 | static int arc_mmap_unmap (void *header, size_t headersz _libctf_unused_, | |
778 | const char **errmsg _libctf_unused_) | |
779 | { | |
780 | free (header); | |
781 | return 0; | |
782 | } | |
783 | #endif |