Commit | Line | Data |
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9402cc59 | 1 | /* CTF archive files. |
b3adc24a | 2 | Copyright (C) 2019-2020 Free Software Foundation, Inc. |
9402cc59 NA |
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 | ||
5537f9b9 NA |
47 | /* Write out a CTF archive to the start of the file referenced by the passed-in |
48 | fd. The entries in CTF_FILES are referenced by name: the names are passed in | |
49 | the names array, which must have CTF_FILES entries. | |
9402cc59 NA |
50 | |
51 | Returns 0 on success, or an errno, or an ECTF_* value. */ | |
52 | int | |
5537f9b9 NA |
53 | ctf_arc_write_fd (int fd, ctf_file_t **ctf_files, size_t ctf_file_cnt, |
54 | const char **names, size_t threshold) | |
9402cc59 NA |
55 | { |
56 | const char *errmsg; | |
57 | struct ctf_archive *archdr; | |
9402cc59 NA |
58 | size_t i; |
59 | char dummy = 0; | |
60 | size_t headersz; | |
61 | ssize_t namesz; | |
62 | size_t ctf_startoffs; /* Start of the section we are working over. */ | |
63 | char *nametbl = NULL; /* The name table. */ | |
64 | char *np; | |
65 | off_t nameoffs; | |
66 | struct ctf_archive_modent *modent; | |
67 | ||
5537f9b9 | 68 | ctf_dprintf ("Writing CTF archive with %lu files\n", |
62d8e3b7 | 69 | (unsigned long) ctf_file_cnt); |
9402cc59 | 70 | |
9402cc59 NA |
71 | /* Figure out the size of the mmap()ed header, including the |
72 | ctf_archive_modent array. We assume that all of this needs no | |
73 | padding: a likely assumption, given that it's all made up of | |
74 | uint64_t's. */ | |
75 | headersz = sizeof (struct ctf_archive) | |
76 | + (ctf_file_cnt * sizeof (uint64_t) * 2); | |
62d8e3b7 | 77 | ctf_dprintf ("headersz is %lu\n", (unsigned long) headersz); |
9402cc59 NA |
78 | |
79 | /* From now on we work in two pieces: an mmap()ed region from zero up to the | |
80 | headersz, and a region updated via write() starting after that, containing | |
81 | all the tables. Platforms that do not support mmap() just use write(). */ | |
82 | ctf_startoffs = headersz; | |
83 | if (lseek (fd, ctf_startoffs - 1, SEEK_SET) < 0) | |
84 | { | |
5537f9b9 NA |
85 | errmsg = "ctf_arc_write(): cannot extend file while writing: %s\n"; |
86 | goto err; | |
9402cc59 NA |
87 | } |
88 | ||
89 | if (write (fd, &dummy, 1) < 0) | |
90 | { | |
5537f9b9 NA |
91 | errmsg = "ctf_arc_write(): cannot extend file while writing: %s\n"; |
92 | goto err; | |
9402cc59 NA |
93 | } |
94 | ||
95 | if ((archdr = arc_mmap_header (fd, headersz)) == NULL) | |
96 | { | |
5537f9b9 NA |
97 | errmsg = "ctf_arc_write(): Cannot mmap(): %s\n"; |
98 | goto err; | |
9402cc59 NA |
99 | } |
100 | ||
101 | /* Fill in everything we can, which is everything other than the name | |
102 | table offset. */ | |
103 | archdr->ctfa_magic = htole64 (CTFA_MAGIC); | |
104 | archdr->ctfa_nfiles = htole64 (ctf_file_cnt); | |
105 | archdr->ctfa_ctfs = htole64 (ctf_startoffs); | |
106 | ||
107 | /* We could validate that all CTF files have the same data model, but | |
108 | since any reasonable construction process will be building things of | |
109 | only one bitness anyway, this is pretty pointless, so just use the | |
110 | model of the first CTF file for all of them. (It *is* valid to | |
111 | create an empty archive: the value of ctfa_model is irrelevant in | |
112 | this case, but we must be sure not to dereference uninitialized | |
113 | memory.) */ | |
114 | ||
115 | if (ctf_file_cnt > 0) | |
116 | archdr->ctfa_model = htole64 (ctf_getmodel (ctf_files[0])); | |
117 | ||
118 | /* Now write out the CTFs: ctf_archive_modent array via the mapping, | |
119 | ctfs via write(). The names themselves have not been written yet: we | |
120 | track them in a local strtab until the time is right, and sort the | |
121 | modents array after construction. | |
122 | ||
123 | The name table is not sorted. */ | |
124 | ||
125 | for (i = 0, namesz = 0; i < le64toh (archdr->ctfa_nfiles); i++) | |
126 | namesz += strlen (names[i]) + 1; | |
127 | ||
128 | nametbl = malloc (namesz); | |
129 | if (nametbl == NULL) | |
130 | { | |
5537f9b9 | 131 | errmsg = "Error writing named CTF to archive: %s\n"; |
9402cc59 NA |
132 | goto err_unmap; |
133 | } | |
134 | ||
135 | for (i = 0, namesz = 0, | |
136 | modent = (ctf_archive_modent_t *) ((char *) archdr | |
137 | + sizeof (struct ctf_archive)); | |
138 | i < le64toh (archdr->ctfa_nfiles); i++) | |
139 | { | |
140 | off_t off; | |
141 | ||
142 | strcpy (&nametbl[namesz], names[i]); | |
143 | ||
144 | off = arc_write_one_ctf (ctf_files[i], fd, threshold); | |
9402cc59 NA |
145 | if ((off < 0) && (off > -ECTF_BASE)) |
146 | { | |
147 | errmsg = "ctf_arc_write(): Cannot determine file " | |
5537f9b9 | 148 | "position while writing to archive: %s"; |
9402cc59 NA |
149 | goto err_free; |
150 | } | |
151 | if (off < 0) | |
152 | { | |
5537f9b9 | 153 | errmsg = "ctf_arc_write(): Cannot write CTF file to archive: %s\n"; |
9402cc59 NA |
154 | errno = off * -1; |
155 | goto err_free; | |
156 | } | |
157 | ||
158 | modent->name_offset = htole64 (namesz); | |
159 | modent->ctf_offset = htole64 (off - ctf_startoffs); | |
160 | namesz += strlen (names[i]) + 1; | |
161 | modent++; | |
162 | } | |
163 | ||
6b22174f NA |
164 | ctf_qsort_r ((ctf_archive_modent_t *) ((char *) archdr |
165 | + sizeof (struct ctf_archive)), | |
166 | le64toh (archdr->ctfa_nfiles), | |
167 | sizeof (struct ctf_archive_modent), sort_modent_by_name, | |
168 | nametbl); | |
9402cc59 NA |
169 | |
170 | /* Now the name table. */ | |
171 | ||
172 | if ((nameoffs = lseek (fd, 0, SEEK_CUR)) < 0) | |
173 | { | |
174 | errmsg = "ctf_arc_write(): Cannot get current file position " | |
5537f9b9 | 175 | "in archive: %s\n"; |
9402cc59 NA |
176 | goto err_free; |
177 | } | |
178 | archdr->ctfa_names = htole64 (nameoffs); | |
179 | np = nametbl; | |
180 | while (namesz > 0) | |
181 | { | |
182 | ssize_t len; | |
183 | if ((len = write (fd, np, namesz)) < 0) | |
184 | { | |
5537f9b9 | 185 | errmsg = "ctf_arc_write(): Cannot write name table to archive: %s\n"; |
9402cc59 NA |
186 | goto err_free; |
187 | } | |
188 | namesz -= len; | |
189 | np += len; | |
190 | } | |
191 | free (nametbl); | |
192 | ||
193 | if (arc_mmap_writeout (fd, archdr, headersz, &errmsg) < 0) | |
194 | goto err_unmap; | |
195 | if (arc_mmap_unmap (archdr, headersz, &errmsg) < 0) | |
5537f9b9 | 196 | goto err; |
9402cc59 NA |
197 | return 0; |
198 | ||
199 | err_free: | |
200 | free (nametbl); | |
201 | err_unmap: | |
202 | arc_mmap_unmap (archdr, headersz, NULL); | |
9402cc59 | 203 | err: |
5537f9b9 | 204 | ctf_dprintf (errmsg, errno < ECTF_BASE ? strerror (errno) : |
9402cc59 NA |
205 | ctf_errmsg (errno)); |
206 | return errno; | |
207 | } | |
208 | ||
5537f9b9 NA |
209 | /* Write out a CTF archive. The entries in CTF_FILES are referenced by name: |
210 | the names are passed in the names array, which must have CTF_FILES entries. | |
211 | ||
212 | If the filename is NULL, create a temporary file and return a pointer to it. | |
213 | ||
214 | Returns 0 on success, or an errno, or an ECTF_* value. */ | |
215 | int | |
216 | ctf_arc_write (const char *file, ctf_file_t ** ctf_files, size_t ctf_file_cnt, | |
217 | const char **names, size_t threshold) | |
218 | { | |
219 | int err; | |
220 | int fd; | |
221 | ||
222 | if ((fd = open (file, O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0666)) < 0) | |
223 | { | |
224 | ctf_dprintf ("ctf_arc_write(): cannot create %s: %s\n", file, | |
225 | strerror (errno)); | |
226 | return errno; | |
227 | } | |
228 | ||
229 | err = ctf_arc_write_fd (fd, ctf_files, ctf_file_cnt, names, threshold); | |
230 | if (err) | |
231 | goto err; | |
232 | ||
233 | if ((err = close (fd)) < 0) | |
234 | { | |
235 | ctf_dprintf ("ctf_arc_write(): Cannot close after writing to archive: " | |
236 | "%s\n", strerror (errno)); | |
237 | goto err_close; | |
238 | } | |
239 | ||
240 | err: | |
241 | close (fd); | |
242 | if (err < 0) | |
243 | unlink (file); | |
244 | ||
245 | return err; | |
246 | ||
247 | err_close: | |
248 | if (err < 0) | |
249 | unlink (file); | |
250 | ||
251 | return err; | |
252 | } | |
253 | ||
9402cc59 NA |
254 | /* Write one CTF file out. Return the file position of the written file (or |
255 | rather, of the file-size uint64_t that precedes it): negative return is a | |
256 | negative errno or ctf_errno value. On error, the file position may no longer | |
257 | be at the end of the file. */ | |
258 | static off_t | |
259 | arc_write_one_ctf (ctf_file_t * f, int fd, size_t threshold) | |
260 | { | |
261 | off_t off, end_off; | |
262 | uint64_t ctfsz = 0; | |
263 | char *ctfszp; | |
264 | size_t ctfsz_len; | |
265 | int (*writefn) (ctf_file_t * fp, int fd); | |
266 | ||
676c3ecb NA |
267 | if (ctf_serialize (f) < 0) |
268 | return f->ctf_errno * -1; | |
269 | ||
9402cc59 NA |
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 | ||
2e428e74 | 332 | /* bsearch_r() function to search for a given name in the sorted array of struct |
9402cc59 NA |
333 | ctf_archive_modents. */ |
334 | static int | |
2e428e74 | 335 | search_modent_by_name (const void *key, const void *ent, void *arg) |
9402cc59 NA |
336 | { |
337 | const char *k = key; | |
338 | const struct ctf_archive_modent *v = ent; | |
2e428e74 | 339 | const char *search_nametbl = arg; |
9402cc59 NA |
340 | |
341 | return strcmp (k, &search_nametbl[le64toh (v->name_offset)]); | |
342 | } | |
343 | ||
2f6ecaed NA |
344 | /* Make a new struct ctf_archive_internal wrapper for a ctf_archive or a |
345 | ctf_file. Closes ARC and/or FP on error. Arrange to free the SYMSECT or | |
346 | STRSECT, as needed, on close. */ | |
347 | ||
348 | struct ctf_archive_internal * | |
349 | ctf_new_archive_internal (int is_archive, struct ctf_archive *arc, | |
350 | ctf_file_t *fp, const ctf_sect_t *symsect, | |
351 | const ctf_sect_t *strsect, | |
352 | int *errp) | |
9402cc59 | 353 | { |
2f6ecaed | 354 | struct ctf_archive_internal *arci; |
9402cc59 | 355 | |
2f6ecaed | 356 | if ((arci = calloc (1, sizeof (struct ctf_archive_internal))) == NULL) |
9402cc59 | 357 | { |
2f6ecaed NA |
358 | if (is_archive) |
359 | ctf_arc_close_internal (arc); | |
360 | else | |
361 | ctf_file_close (fp); | |
362 | return (ctf_set_open_errno (errp, errno)); | |
9402cc59 | 363 | } |
2f6ecaed NA |
364 | arci->ctfi_is_archive = is_archive; |
365 | if (is_archive) | |
366 | arci->ctfi_archive = arc; | |
367 | else | |
368 | arci->ctfi_file = fp; | |
369 | if (symsect) | |
370 | memcpy (&arci->ctfi_symsect, symsect, sizeof (struct ctf_sect)); | |
371 | if (strsect) | |
372 | memcpy (&arci->ctfi_strsect, strsect, sizeof (struct ctf_sect)); | |
373 | arci->ctfi_free_symsect = 0; | |
374 | ||
375 | return arci; | |
376 | } | |
377 | ||
378 | /* Open a CTF archive or dictionary from data in a buffer (which the caller must | |
379 | preserve until ctf_arc_close() time). Returns the archive, or NULL and an | |
380 | error in *err (if not NULL). */ | |
381 | ctf_archive_t * | |
382 | ctf_arc_bufopen (const ctf_sect_t *ctfsect, const ctf_sect_t *symsect, | |
383 | const ctf_sect_t *strsect, int *errp) | |
384 | { | |
385 | struct ctf_archive *arc = NULL; | |
386 | int is_archive; | |
387 | ctf_file_t *fp = NULL; | |
388 | ||
389 | if (ctfsect->cts_size > sizeof (uint64_t) && | |
390 | ((*(uint64_t *) ctfsect->cts_data) == CTFA_MAGIC)) | |
391 | { | |
392 | /* The archive is mmappable, so this operation is trivial. */ | |
393 | ||
394 | is_archive = 1; | |
395 | arc = (struct ctf_archive *) ctfsect->cts_data; | |
396 | } | |
397 | else | |
398 | { | |
399 | is_archive = 0; | |
400 | if ((fp = ctf_bufopen (ctfsect, symsect, strsect, errp)) == NULL) | |
401 | { | |
402 | ctf_dprintf ("ctf_internal_open(): cannot open CTF: %s\n", | |
403 | ctf_errmsg (*errp)); | |
404 | return NULL; | |
405 | } | |
406 | } | |
407 | return ctf_new_archive_internal (is_archive, arc, fp, symsect, strsect, | |
408 | errp); | |
9402cc59 NA |
409 | } |
410 | ||
411 | /* Open a CTF archive. Returns the archive, or NULL and an error in *err (if | |
412 | not NULL). */ | |
413 | struct ctf_archive * | |
414 | ctf_arc_open_internal (const char *filename, int *errp) | |
415 | { | |
416 | const char *errmsg; | |
417 | int fd; | |
418 | struct stat s; | |
419 | struct ctf_archive *arc; /* (Actually the whole file.) */ | |
420 | ||
421 | libctf_init_debug(); | |
422 | if ((fd = open (filename, O_RDONLY)) < 0) | |
423 | { | |
424 | errmsg = "ctf_arc_open(): cannot open %s: %s\n"; | |
425 | goto err; | |
426 | } | |
427 | if (fstat (fd, &s) < 0) | |
428 | { | |
429 | errmsg = "ctf_arc_open(): cannot stat %s: %s\n"; | |
430 | goto err_close; | |
431 | } | |
432 | ||
433 | if ((arc = arc_mmap_file (fd, s.st_size)) == NULL) | |
434 | { | |
435 | errmsg = "ctf_arc_open(): Cannot read in %s: %s\n"; | |
436 | goto err_close; | |
437 | } | |
438 | ||
439 | if (le64toh (arc->ctfa_magic) != CTFA_MAGIC) | |
440 | { | |
441 | errmsg = "ctf_arc_open(): Invalid magic number"; | |
442 | errno = ECTF_FMT; | |
443 | goto err_unmap; | |
444 | } | |
445 | ||
446 | /* This horrible hack lets us know how much to unmap when the file is | |
447 | closed. (We no longer need the magic number, and the mapping | |
448 | is private.) */ | |
449 | arc->ctfa_magic = s.st_size; | |
450 | close (fd); | |
451 | return arc; | |
452 | ||
453 | err_unmap: | |
454 | arc_mmap_unmap (arc, s.st_size, NULL); | |
455 | err_close: | |
456 | close (fd); | |
457 | err: | |
458 | if (errp) | |
459 | *errp = errno; | |
460 | ctf_dprintf (errmsg, filename, errno < ECTF_BASE ? strerror (errno) : | |
461 | ctf_errmsg (errno)); | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | /* Close an archive. */ | |
466 | void | |
467 | ctf_arc_close_internal (struct ctf_archive *arc) | |
468 | { | |
469 | if (arc == NULL) | |
470 | return; | |
471 | ||
472 | /* See the comment in ctf_arc_open(). */ | |
473 | arc_mmap_unmap (arc, arc->ctfa_magic, NULL); | |
474 | } | |
475 | ||
476 | /* Public entry point: close an archive, or CTF file. */ | |
477 | void | |
478 | ctf_arc_close (ctf_archive_t *arc) | |
479 | { | |
480 | if (arc == NULL) | |
481 | return; | |
482 | ||
483 | if (arc->ctfi_is_archive) | |
484 | ctf_arc_close_internal (arc->ctfi_archive); | |
485 | else | |
486 | ctf_file_close (arc->ctfi_file); | |
2f6ecaed NA |
487 | if (arc->ctfi_free_symsect) |
488 | free ((void *) arc->ctfi_symsect.cts_data); | |
9402cc59 | 489 | free (arc->ctfi_data); |
f046147d NA |
490 | if (arc->ctfi_bfd_close) |
491 | arc->ctfi_bfd_close (arc); | |
9402cc59 NA |
492 | free (arc); |
493 | } | |
494 | ||
495 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
496 | non-NULL. A name of NULL means to open the default file. */ | |
497 | static ctf_file_t * | |
498 | ctf_arc_open_by_name_internal (const struct ctf_archive *arc, | |
499 | const ctf_sect_t *symsect, | |
500 | const ctf_sect_t *strsect, | |
501 | const char *name, int *errp) | |
502 | { | |
503 | struct ctf_archive_modent *modent; | |
2e428e74 | 504 | const char *search_nametbl; |
9402cc59 NA |
505 | |
506 | if (name == NULL) | |
507 | name = _CTF_SECTION; /* The default name. */ | |
508 | ||
509 | ctf_dprintf ("ctf_arc_open_by_name(%s): opening\n", name); | |
510 | ||
511 | modent = (ctf_archive_modent_t *) ((char *) arc | |
512 | + sizeof (struct ctf_archive)); | |
513 | ||
2e428e74 NA |
514 | search_nametbl = (const char *) arc + le64toh (arc->ctfa_names); |
515 | modent = bsearch_r (name, modent, le64toh (arc->ctfa_nfiles), | |
516 | sizeof (struct ctf_archive_modent), | |
517 | search_modent_by_name, (void *) search_nametbl); | |
9402cc59 NA |
518 | |
519 | /* This is actually a common case and normal operation: no error | |
520 | debug output. */ | |
521 | if (modent == NULL) | |
522 | { | |
523 | if (errp) | |
524 | *errp = ECTF_ARNNAME; | |
525 | return NULL; | |
526 | } | |
527 | ||
528 | return ctf_arc_open_by_offset (arc, symsect, strsect, | |
529 | le64toh (modent->ctf_offset), errp); | |
530 | } | |
531 | ||
532 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
533 | non-NULL. A name of NULL means to open the default file. | |
534 | ||
535 | Use the specified string and symbol table sections. | |
536 | ||
537 | Public entry point. */ | |
538 | ctf_file_t * | |
539 | ctf_arc_open_by_name_sections (const ctf_archive_t *arc, | |
540 | const ctf_sect_t *symsect, | |
541 | const ctf_sect_t *strsect, | |
542 | const char *name, | |
543 | int *errp) | |
544 | { | |
545 | if (arc->ctfi_is_archive) | |
546 | { | |
547 | ctf_file_t *ret; | |
548 | ret = ctf_arc_open_by_name_internal (arc->ctfi_archive, symsect, strsect, | |
549 | name, errp); | |
550 | if (ret) | |
551 | ret->ctf_archive = (ctf_archive_t *) arc; | |
552 | return ret; | |
553 | } | |
554 | ||
555 | if ((name != NULL) && (strcmp (name, _CTF_SECTION) != 0)) | |
556 | { | |
557 | if (errp) | |
558 | *errp = ECTF_ARNNAME; | |
559 | return NULL; | |
560 | } | |
561 | arc->ctfi_file->ctf_archive = (ctf_archive_t *) arc; | |
562 | ||
563 | /* Bump the refcount so that the user can ctf_file_close() it. */ | |
564 | arc->ctfi_file->ctf_refcnt++; | |
565 | return arc->ctfi_file; | |
566 | } | |
567 | ||
568 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
569 | non-NULL. A name of NULL means to open the default file. | |
570 | ||
571 | Public entry point. */ | |
572 | ctf_file_t * | |
573 | ctf_arc_open_by_name (const ctf_archive_t *arc, const char *name, int *errp) | |
574 | { | |
575 | const ctf_sect_t *symsect = &arc->ctfi_symsect; | |
576 | const ctf_sect_t *strsect = &arc->ctfi_strsect; | |
577 | ||
578 | if (symsect->cts_name == NULL) | |
579 | symsect = NULL; | |
580 | if (strsect->cts_name == NULL) | |
581 | strsect = NULL; | |
582 | ||
583 | return ctf_arc_open_by_name_sections (arc, symsect, strsect, name, errp); | |
584 | } | |
585 | ||
586 | /* Return the ctf_file_t at the given ctfa_ctfs-relative offset, or NULL if | |
587 | none, setting 'err' if non-NULL. */ | |
588 | static ctf_file_t * | |
589 | ctf_arc_open_by_offset (const struct ctf_archive *arc, | |
590 | const ctf_sect_t *symsect, | |
591 | const ctf_sect_t *strsect, size_t offset, | |
592 | int *errp) | |
593 | { | |
594 | ctf_sect_t ctfsect; | |
595 | ctf_file_t *fp; | |
596 | ||
62d8e3b7 | 597 | ctf_dprintf ("ctf_arc_open_by_offset(%lu): opening\n", (unsigned long) offset); |
9402cc59 | 598 | |
a0486bac | 599 | memset (&ctfsect, 0, sizeof (ctf_sect_t)); |
9402cc59 NA |
600 | |
601 | offset += le64toh (arc->ctfa_ctfs); | |
602 | ||
603 | ctfsect.cts_name = _CTF_SECTION; | |
9402cc59 NA |
604 | ctfsect.cts_size = le64toh (*((uint64_t *) ((char *) arc + offset))); |
605 | ctfsect.cts_entsize = 1; | |
9402cc59 NA |
606 | ctfsect.cts_data = (void *) ((char *) arc + offset + sizeof (uint64_t)); |
607 | fp = ctf_bufopen (&ctfsect, symsect, strsect, errp); | |
608 | if (fp) | |
609 | ctf_setmodel (fp, le64toh (arc->ctfa_model)); | |
610 | return fp; | |
611 | } | |
612 | ||
613 | /* Raw iteration over all CTF files in an archive. We pass the raw data for all | |
614 | CTF files in turn to the specified callback function. */ | |
615 | static int | |
616 | ctf_archive_raw_iter_internal (const struct ctf_archive *arc, | |
617 | ctf_archive_raw_member_f *func, void *data) | |
618 | { | |
619 | int rc; | |
620 | size_t i; | |
621 | struct ctf_archive_modent *modent; | |
622 | const char *nametbl; | |
623 | ||
624 | modent = (ctf_archive_modent_t *) ((char *) arc | |
625 | + sizeof (struct ctf_archive)); | |
626 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); | |
627 | ||
628 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) | |
629 | { | |
630 | const char *name; | |
631 | char *fp; | |
632 | ||
633 | name = &nametbl[le64toh (modent[i].name_offset)]; | |
634 | fp = ((char *) arc + le64toh (arc->ctfa_ctfs) | |
635 | + le64toh (modent[i].ctf_offset)); | |
636 | ||
637 | if ((rc = func (name, (void *) (fp + sizeof (uint64_t)), | |
638 | le64toh (*((uint64_t *) fp)), data)) != 0) | |
639 | return rc; | |
640 | } | |
641 | return 0; | |
642 | } | |
643 | ||
644 | /* Raw iteration over all CTF files in an archive: public entry point. | |
645 | ||
646 | Returns -EINVAL if not supported for this sort of archive. */ | |
647 | int | |
648 | ctf_archive_raw_iter (const ctf_archive_t *arc, | |
649 | ctf_archive_raw_member_f * func, void *data) | |
650 | { | |
651 | if (arc->ctfi_is_archive) | |
652 | return ctf_archive_raw_iter_internal (arc->ctfi_archive, func, data); | |
653 | ||
654 | return -EINVAL; /* Not supported. */ | |
655 | } | |
656 | ||
657 | /* Iterate over all CTF files in an archive. We pass all CTF files in turn to | |
658 | the specified callback function. */ | |
659 | static int | |
660 | ctf_archive_iter_internal (const ctf_archive_t *wrapper, | |
661 | const struct ctf_archive *arc, | |
662 | const ctf_sect_t *symsect, | |
663 | const ctf_sect_t *strsect, | |
664 | ctf_archive_member_f *func, void *data) | |
665 | { | |
666 | int rc; | |
667 | size_t i; | |
668 | ctf_file_t *f; | |
669 | struct ctf_archive_modent *modent; | |
670 | const char *nametbl; | |
671 | ||
672 | modent = (ctf_archive_modent_t *) ((char *) arc | |
673 | + sizeof (struct ctf_archive)); | |
674 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); | |
675 | ||
676 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) | |
677 | { | |
678 | const char *name; | |
679 | ||
680 | name = &nametbl[le64toh (modent[i].name_offset)]; | |
681 | if ((f = ctf_arc_open_by_name_internal (arc, symsect, strsect, | |
682 | name, &rc)) == NULL) | |
683 | return rc; | |
684 | ||
685 | f->ctf_archive = (ctf_archive_t *) wrapper; | |
686 | if ((rc = func (f, name, data)) != 0) | |
687 | { | |
688 | ctf_file_close (f); | |
689 | return rc; | |
690 | } | |
691 | ||
692 | ctf_file_close (f); | |
693 | } | |
694 | return 0; | |
695 | } | |
696 | ||
697 | /* Iterate over all CTF files in an archive: public entry point. We pass all | |
698 | CTF files in turn to the specified callback function. */ | |
699 | int | |
700 | ctf_archive_iter (const ctf_archive_t *arc, ctf_archive_member_f *func, | |
701 | void *data) | |
702 | { | |
703 | const ctf_sect_t *symsect = &arc->ctfi_symsect; | |
704 | const ctf_sect_t *strsect = &arc->ctfi_strsect; | |
705 | ||
706 | if (symsect->cts_name == NULL) | |
707 | symsect = NULL; | |
708 | if (strsect->cts_name == NULL) | |
709 | strsect = NULL; | |
710 | ||
711 | if (arc->ctfi_is_archive) | |
712 | return ctf_archive_iter_internal (arc, arc->ctfi_archive, symsect, strsect, | |
713 | func, data); | |
714 | ||
715 | return func (arc->ctfi_file, _CTF_SECTION, data); | |
716 | } | |
717 | ||
718 | #ifdef HAVE_MMAP | |
719 | /* Map the header in. Only used on new, empty files. */ | |
720 | static void *arc_mmap_header (int fd, size_t headersz) | |
721 | { | |
722 | void *hdr; | |
723 | if ((hdr = mmap (NULL, headersz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, | |
724 | 0)) == MAP_FAILED) | |
725 | return NULL; | |
726 | return hdr; | |
727 | } | |
728 | ||
729 | /* mmap() the whole file, for reading only. (Map it writably, but privately: we | |
730 | need to modify the region, but don't need anyone else to see the | |
731 | modifications.) */ | |
732 | static void *arc_mmap_file (int fd, size_t size) | |
733 | { | |
734 | void *arc; | |
735 | if ((arc = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, | |
736 | fd, 0)) == MAP_FAILED) | |
737 | return NULL; | |
738 | return arc; | |
739 | } | |
740 | ||
741 | /* Persist the header to disk. */ | |
742 | static int arc_mmap_writeout (int fd _libctf_unused_, void *header, | |
743 | size_t headersz, const char **errmsg) | |
744 | { | |
745 | if (msync (header, headersz, MS_ASYNC) < 0) | |
746 | { | |
747 | if (errmsg) | |
748 | *errmsg = "arc_mmap_writeout(): Cannot sync after writing to %s: %s\n"; | |
749 | return -1; | |
750 | } | |
751 | return 0; | |
752 | } | |
753 | ||
754 | /* Unmap the region. */ | |
755 | static int arc_mmap_unmap (void *header, size_t headersz, const char **errmsg) | |
756 | { | |
757 | if (munmap (header, headersz) < 0) | |
758 | { | |
759 | if (errmsg) | |
760 | *errmsg = "arc_mmap_munmap(): Cannot unmap after writing to %s: %s\n"; | |
761 | return -1; | |
762 | } | |
763 | return 0; | |
764 | } | |
765 | #else | |
766 | /* Map the header in. Only used on new, empty files. */ | |
f5e73be1 | 767 | static void *arc_mmap_header (int fd _libctf_unused_, size_t headersz) |
9402cc59 NA |
768 | { |
769 | void *hdr; | |
770 | if ((hdr = malloc (headersz)) == NULL) | |
771 | return NULL; | |
772 | return hdr; | |
773 | } | |
774 | ||
775 | /* Pull in the whole file, for reading only. We assume the current file | |
776 | position is at the start of the file. */ | |
777 | static void *arc_mmap_file (int fd, size_t size) | |
778 | { | |
779 | char *data; | |
780 | ||
781 | if ((data = malloc (size)) == NULL) | |
782 | return NULL; | |
783 | ||
784 | if (ctf_pread (fd, data, size, 0) < 0) | |
785 | { | |
786 | free (data); | |
787 | return NULL; | |
788 | } | |
789 | return data; | |
790 | } | |
791 | ||
792 | /* Persist the header to disk. */ | |
793 | static int arc_mmap_writeout (int fd, void *header, size_t headersz, | |
794 | const char **errmsg) | |
795 | { | |
796 | ssize_t len; | |
797 | size_t acc = 0; | |
798 | char *data = (char *) header; | |
799 | ssize_t count = headersz; | |
800 | ||
801 | if ((lseek (fd, 0, SEEK_SET)) < 0) | |
802 | { | |
803 | if (errmsg) | |
804 | *errmsg = "arc_mmap_writeout(): Cannot seek while writing header to " | |
805 | "%s: %s\n"; | |
806 | return -1; | |
807 | } | |
808 | ||
809 | while (headersz > 0) | |
810 | { | |
811 | if ((len = write (fd, data, count)) < 0) | |
812 | { | |
813 | if (errmsg) | |
814 | *errmsg = "arc_mmap_writeout(): Cannot write header to %s: %s\n"; | |
815 | return len; | |
816 | } | |
817 | if (len == EINTR) | |
818 | continue; | |
819 | ||
820 | acc += len; | |
821 | if (len == 0) /* EOF. */ | |
822 | break; | |
823 | ||
824 | count -= len; | |
825 | data += len; | |
826 | } | |
827 | return 0; | |
828 | } | |
829 | ||
830 | /* Unmap the region. */ | |
831 | static int arc_mmap_unmap (void *header, size_t headersz _libctf_unused_, | |
832 | const char **errmsg _libctf_unused_) | |
833 | { | |
834 | free (header); | |
835 | return 0; | |
836 | } | |
837 | #endif |