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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) | |
df16e041 | 231 | goto err_close; |
5537f9b9 NA |
232 | |
233 | if ((err = close (fd)) < 0) | |
df16e041 NC |
234 | ctf_dprintf ("ctf_arc_write(): Cannot close after writing to archive: " |
235 | "%s\n", strerror (errno)); | |
236 | goto err; | |
5537f9b9 NA |
237 | |
238 | err_close: | |
df16e041 NC |
239 | (void) close (fd); |
240 | err: | |
5537f9b9 NA |
241 | if (err < 0) |
242 | unlink (file); | |
243 | ||
244 | return err; | |
245 | } | |
246 | ||
9402cc59 NA |
247 | /* Write one CTF file out. Return the file position of the written file (or |
248 | rather, of the file-size uint64_t that precedes it): negative return is a | |
249 | negative errno or ctf_errno value. On error, the file position may no longer | |
250 | be at the end of the file. */ | |
251 | static off_t | |
252 | arc_write_one_ctf (ctf_file_t * f, int fd, size_t threshold) | |
253 | { | |
254 | off_t off, end_off; | |
255 | uint64_t ctfsz = 0; | |
256 | char *ctfszp; | |
257 | size_t ctfsz_len; | |
258 | int (*writefn) (ctf_file_t * fp, int fd); | |
259 | ||
676c3ecb NA |
260 | if (ctf_serialize (f) < 0) |
261 | return f->ctf_errno * -1; | |
262 | ||
9402cc59 NA |
263 | if ((off = lseek (fd, 0, SEEK_CUR)) < 0) |
264 | return errno * -1; | |
265 | ||
266 | if (f->ctf_size > threshold) | |
267 | writefn = ctf_compress_write; | |
268 | else | |
269 | writefn = ctf_write; | |
270 | ||
271 | /* This zero-write turns into the size in a moment. */ | |
272 | ctfsz_len = sizeof (ctfsz); | |
273 | ctfszp = (char *) &ctfsz; | |
274 | while (ctfsz_len > 0) | |
275 | { | |
276 | ssize_t writelen = write (fd, ctfszp, ctfsz_len); | |
277 | if (writelen < 0) | |
278 | return errno * -1; | |
279 | ctfsz_len -= writelen; | |
280 | ctfszp += writelen; | |
281 | } | |
282 | ||
283 | if (writefn (f, fd) != 0) | |
284 | return f->ctf_errno * -1; | |
285 | ||
286 | if ((end_off = lseek (fd, 0, SEEK_CUR)) < 0) | |
287 | return errno * -1; | |
288 | ctfsz = htole64 (end_off - off); | |
289 | ||
290 | if ((lseek (fd, off, SEEK_SET)) < 0) | |
291 | return errno * -1; | |
292 | ||
293 | /* ... here. */ | |
294 | ctfsz_len = sizeof (ctfsz); | |
295 | ctfszp = (char *) &ctfsz; | |
296 | while (ctfsz_len > 0) | |
297 | { | |
298 | ssize_t writelen = write (fd, ctfszp, ctfsz_len); | |
299 | if (writelen < 0) | |
300 | return errno * -1; | |
301 | ctfsz_len -= writelen; | |
302 | ctfszp += writelen; | |
303 | } | |
304 | ||
305 | end_off = LCTF_ALIGN_OFFS (end_off, 8); | |
306 | if ((lseek (fd, end_off, SEEK_SET)) < 0) | |
307 | return errno * -1; | |
308 | ||
309 | return off; | |
310 | } | |
311 | ||
312 | /* qsort() function to sort the array of struct ctf_archive_modents into | |
313 | ascending name order. */ | |
314 | static int | |
315 | sort_modent_by_name (const void *one, const void *two, void *n) | |
316 | { | |
317 | const struct ctf_archive_modent *a = one; | |
318 | const struct ctf_archive_modent *b = two; | |
319 | char *nametbl = n; | |
320 | ||
321 | return strcmp (&nametbl[le64toh (a->name_offset)], | |
322 | &nametbl[le64toh (b->name_offset)]); | |
323 | } | |
324 | ||
2e428e74 | 325 | /* bsearch_r() function to search for a given name in the sorted array of struct |
9402cc59 NA |
326 | ctf_archive_modents. */ |
327 | static int | |
2e428e74 | 328 | search_modent_by_name (const void *key, const void *ent, void *arg) |
9402cc59 NA |
329 | { |
330 | const char *k = key; | |
331 | const struct ctf_archive_modent *v = ent; | |
2e428e74 | 332 | const char *search_nametbl = arg; |
9402cc59 NA |
333 | |
334 | return strcmp (k, &search_nametbl[le64toh (v->name_offset)]); | |
335 | } | |
336 | ||
2f6ecaed NA |
337 | /* Make a new struct ctf_archive_internal wrapper for a ctf_archive or a |
338 | ctf_file. Closes ARC and/or FP on error. Arrange to free the SYMSECT or | |
339 | STRSECT, as needed, on close. */ | |
340 | ||
341 | struct ctf_archive_internal * | |
342 | ctf_new_archive_internal (int is_archive, struct ctf_archive *arc, | |
343 | ctf_file_t *fp, const ctf_sect_t *symsect, | |
344 | const ctf_sect_t *strsect, | |
345 | int *errp) | |
9402cc59 | 346 | { |
2f6ecaed | 347 | struct ctf_archive_internal *arci; |
9402cc59 | 348 | |
2f6ecaed | 349 | if ((arci = calloc (1, sizeof (struct ctf_archive_internal))) == NULL) |
9402cc59 | 350 | { |
2f6ecaed NA |
351 | if (is_archive) |
352 | ctf_arc_close_internal (arc); | |
353 | else | |
354 | ctf_file_close (fp); | |
355 | return (ctf_set_open_errno (errp, errno)); | |
9402cc59 | 356 | } |
2f6ecaed NA |
357 | arci->ctfi_is_archive = is_archive; |
358 | if (is_archive) | |
359 | arci->ctfi_archive = arc; | |
360 | else | |
361 | arci->ctfi_file = fp; | |
362 | if (symsect) | |
363 | memcpy (&arci->ctfi_symsect, symsect, sizeof (struct ctf_sect)); | |
364 | if (strsect) | |
365 | memcpy (&arci->ctfi_strsect, strsect, sizeof (struct ctf_sect)); | |
366 | arci->ctfi_free_symsect = 0; | |
367 | ||
368 | return arci; | |
369 | } | |
370 | ||
371 | /* Open a CTF archive or dictionary from data in a buffer (which the caller must | |
372 | preserve until ctf_arc_close() time). Returns the archive, or NULL and an | |
373 | error in *err (if not NULL). */ | |
374 | ctf_archive_t * | |
375 | ctf_arc_bufopen (const ctf_sect_t *ctfsect, const ctf_sect_t *symsect, | |
376 | const ctf_sect_t *strsect, int *errp) | |
377 | { | |
378 | struct ctf_archive *arc = NULL; | |
379 | int is_archive; | |
380 | ctf_file_t *fp = NULL; | |
381 | ||
382 | if (ctfsect->cts_size > sizeof (uint64_t) && | |
383 | ((*(uint64_t *) ctfsect->cts_data) == CTFA_MAGIC)) | |
384 | { | |
385 | /* The archive is mmappable, so this operation is trivial. */ | |
386 | ||
387 | is_archive = 1; | |
388 | arc = (struct ctf_archive *) ctfsect->cts_data; | |
389 | } | |
390 | else | |
391 | { | |
392 | is_archive = 0; | |
393 | if ((fp = ctf_bufopen (ctfsect, symsect, strsect, errp)) == NULL) | |
394 | { | |
395 | ctf_dprintf ("ctf_internal_open(): cannot open CTF: %s\n", | |
396 | ctf_errmsg (*errp)); | |
397 | return NULL; | |
398 | } | |
399 | } | |
400 | return ctf_new_archive_internal (is_archive, arc, fp, symsect, strsect, | |
401 | errp); | |
9402cc59 NA |
402 | } |
403 | ||
404 | /* Open a CTF archive. Returns the archive, or NULL and an error in *err (if | |
405 | not NULL). */ | |
406 | struct ctf_archive * | |
407 | ctf_arc_open_internal (const char *filename, int *errp) | |
408 | { | |
409 | const char *errmsg; | |
410 | int fd; | |
411 | struct stat s; | |
412 | struct ctf_archive *arc; /* (Actually the whole file.) */ | |
413 | ||
414 | libctf_init_debug(); | |
415 | if ((fd = open (filename, O_RDONLY)) < 0) | |
416 | { | |
417 | errmsg = "ctf_arc_open(): cannot open %s: %s\n"; | |
418 | goto err; | |
419 | } | |
420 | if (fstat (fd, &s) < 0) | |
421 | { | |
422 | errmsg = "ctf_arc_open(): cannot stat %s: %s\n"; | |
423 | goto err_close; | |
424 | } | |
425 | ||
426 | if ((arc = arc_mmap_file (fd, s.st_size)) == NULL) | |
427 | { | |
428 | errmsg = "ctf_arc_open(): Cannot read in %s: %s\n"; | |
429 | goto err_close; | |
430 | } | |
431 | ||
432 | if (le64toh (arc->ctfa_magic) != CTFA_MAGIC) | |
433 | { | |
434 | errmsg = "ctf_arc_open(): Invalid magic number"; | |
435 | errno = ECTF_FMT; | |
436 | goto err_unmap; | |
437 | } | |
438 | ||
439 | /* This horrible hack lets us know how much to unmap when the file is | |
440 | closed. (We no longer need the magic number, and the mapping | |
441 | is private.) */ | |
442 | arc->ctfa_magic = s.st_size; | |
443 | close (fd); | |
444 | return arc; | |
445 | ||
446 | err_unmap: | |
447 | arc_mmap_unmap (arc, s.st_size, NULL); | |
448 | err_close: | |
449 | close (fd); | |
450 | err: | |
451 | if (errp) | |
452 | *errp = errno; | |
453 | ctf_dprintf (errmsg, filename, errno < ECTF_BASE ? strerror (errno) : | |
454 | ctf_errmsg (errno)); | |
455 | return NULL; | |
456 | } | |
457 | ||
458 | /* Close an archive. */ | |
459 | void | |
460 | ctf_arc_close_internal (struct ctf_archive *arc) | |
461 | { | |
462 | if (arc == NULL) | |
463 | return; | |
464 | ||
465 | /* See the comment in ctf_arc_open(). */ | |
466 | arc_mmap_unmap (arc, arc->ctfa_magic, NULL); | |
467 | } | |
468 | ||
469 | /* Public entry point: close an archive, or CTF file. */ | |
470 | void | |
471 | ctf_arc_close (ctf_archive_t *arc) | |
472 | { | |
473 | if (arc == NULL) | |
474 | return; | |
475 | ||
476 | if (arc->ctfi_is_archive) | |
477 | ctf_arc_close_internal (arc->ctfi_archive); | |
478 | else | |
479 | ctf_file_close (arc->ctfi_file); | |
2f6ecaed NA |
480 | if (arc->ctfi_free_symsect) |
481 | free ((void *) arc->ctfi_symsect.cts_data); | |
9402cc59 | 482 | free (arc->ctfi_data); |
f046147d NA |
483 | if (arc->ctfi_bfd_close) |
484 | arc->ctfi_bfd_close (arc); | |
9402cc59 NA |
485 | free (arc); |
486 | } | |
487 | ||
488 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
489 | non-NULL. A name of NULL means to open the default file. */ | |
490 | static ctf_file_t * | |
491 | ctf_arc_open_by_name_internal (const struct ctf_archive *arc, | |
492 | const ctf_sect_t *symsect, | |
493 | const ctf_sect_t *strsect, | |
494 | const char *name, int *errp) | |
495 | { | |
496 | struct ctf_archive_modent *modent; | |
2e428e74 | 497 | const char *search_nametbl; |
9402cc59 NA |
498 | |
499 | if (name == NULL) | |
500 | name = _CTF_SECTION; /* The default name. */ | |
501 | ||
502 | ctf_dprintf ("ctf_arc_open_by_name(%s): opening\n", name); | |
503 | ||
504 | modent = (ctf_archive_modent_t *) ((char *) arc | |
505 | + sizeof (struct ctf_archive)); | |
506 | ||
2e428e74 NA |
507 | search_nametbl = (const char *) arc + le64toh (arc->ctfa_names); |
508 | modent = bsearch_r (name, modent, le64toh (arc->ctfa_nfiles), | |
509 | sizeof (struct ctf_archive_modent), | |
510 | search_modent_by_name, (void *) search_nametbl); | |
9402cc59 NA |
511 | |
512 | /* This is actually a common case and normal operation: no error | |
513 | debug output. */ | |
514 | if (modent == NULL) | |
515 | { | |
516 | if (errp) | |
517 | *errp = ECTF_ARNNAME; | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | return ctf_arc_open_by_offset (arc, symsect, strsect, | |
522 | le64toh (modent->ctf_offset), errp); | |
523 | } | |
524 | ||
525 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
526 | non-NULL. A name of NULL means to open the default file. | |
527 | ||
528 | Use the specified string and symbol table sections. | |
529 | ||
530 | Public entry point. */ | |
531 | ctf_file_t * | |
532 | ctf_arc_open_by_name_sections (const ctf_archive_t *arc, | |
533 | const ctf_sect_t *symsect, | |
534 | const ctf_sect_t *strsect, | |
535 | const char *name, | |
536 | int *errp) | |
537 | { | |
538 | if (arc->ctfi_is_archive) | |
539 | { | |
540 | ctf_file_t *ret; | |
541 | ret = ctf_arc_open_by_name_internal (arc->ctfi_archive, symsect, strsect, | |
542 | name, errp); | |
543 | if (ret) | |
544 | ret->ctf_archive = (ctf_archive_t *) arc; | |
545 | return ret; | |
546 | } | |
547 | ||
548 | if ((name != NULL) && (strcmp (name, _CTF_SECTION) != 0)) | |
549 | { | |
550 | if (errp) | |
551 | *errp = ECTF_ARNNAME; | |
552 | return NULL; | |
553 | } | |
554 | arc->ctfi_file->ctf_archive = (ctf_archive_t *) arc; | |
555 | ||
556 | /* Bump the refcount so that the user can ctf_file_close() it. */ | |
557 | arc->ctfi_file->ctf_refcnt++; | |
558 | return arc->ctfi_file; | |
559 | } | |
560 | ||
561 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if | |
562 | non-NULL. A name of NULL means to open the default file. | |
563 | ||
564 | Public entry point. */ | |
565 | ctf_file_t * | |
566 | ctf_arc_open_by_name (const ctf_archive_t *arc, const char *name, int *errp) | |
567 | { | |
568 | const ctf_sect_t *symsect = &arc->ctfi_symsect; | |
569 | const ctf_sect_t *strsect = &arc->ctfi_strsect; | |
570 | ||
571 | if (symsect->cts_name == NULL) | |
572 | symsect = NULL; | |
573 | if (strsect->cts_name == NULL) | |
574 | strsect = NULL; | |
575 | ||
576 | return ctf_arc_open_by_name_sections (arc, symsect, strsect, name, errp); | |
577 | } | |
578 | ||
579 | /* Return the ctf_file_t at the given ctfa_ctfs-relative offset, or NULL if | |
580 | none, setting 'err' if non-NULL. */ | |
581 | static ctf_file_t * | |
582 | ctf_arc_open_by_offset (const struct ctf_archive *arc, | |
583 | const ctf_sect_t *symsect, | |
584 | const ctf_sect_t *strsect, size_t offset, | |
585 | int *errp) | |
586 | { | |
587 | ctf_sect_t ctfsect; | |
588 | ctf_file_t *fp; | |
589 | ||
62d8e3b7 | 590 | ctf_dprintf ("ctf_arc_open_by_offset(%lu): opening\n", (unsigned long) offset); |
9402cc59 | 591 | |
a0486bac | 592 | memset (&ctfsect, 0, sizeof (ctf_sect_t)); |
9402cc59 NA |
593 | |
594 | offset += le64toh (arc->ctfa_ctfs); | |
595 | ||
596 | ctfsect.cts_name = _CTF_SECTION; | |
9402cc59 NA |
597 | ctfsect.cts_size = le64toh (*((uint64_t *) ((char *) arc + offset))); |
598 | ctfsect.cts_entsize = 1; | |
9402cc59 NA |
599 | ctfsect.cts_data = (void *) ((char *) arc + offset + sizeof (uint64_t)); |
600 | fp = ctf_bufopen (&ctfsect, symsect, strsect, errp); | |
601 | if (fp) | |
602 | ctf_setmodel (fp, le64toh (arc->ctfa_model)); | |
603 | return fp; | |
604 | } | |
605 | ||
606 | /* Raw iteration over all CTF files in an archive. We pass the raw data for all | |
607 | CTF files in turn to the specified callback function. */ | |
608 | static int | |
609 | ctf_archive_raw_iter_internal (const struct ctf_archive *arc, | |
610 | ctf_archive_raw_member_f *func, void *data) | |
611 | { | |
612 | int rc; | |
613 | size_t i; | |
614 | struct ctf_archive_modent *modent; | |
615 | const char *nametbl; | |
616 | ||
617 | modent = (ctf_archive_modent_t *) ((char *) arc | |
618 | + sizeof (struct ctf_archive)); | |
619 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); | |
620 | ||
621 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) | |
622 | { | |
623 | const char *name; | |
624 | char *fp; | |
625 | ||
626 | name = &nametbl[le64toh (modent[i].name_offset)]; | |
627 | fp = ((char *) arc + le64toh (arc->ctfa_ctfs) | |
628 | + le64toh (modent[i].ctf_offset)); | |
629 | ||
630 | if ((rc = func (name, (void *) (fp + sizeof (uint64_t)), | |
631 | le64toh (*((uint64_t *) fp)), data)) != 0) | |
632 | return rc; | |
633 | } | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /* Raw iteration over all CTF files in an archive: public entry point. | |
638 | ||
639 | Returns -EINVAL if not supported for this sort of archive. */ | |
640 | int | |
641 | ctf_archive_raw_iter (const ctf_archive_t *arc, | |
642 | ctf_archive_raw_member_f * func, void *data) | |
643 | { | |
644 | if (arc->ctfi_is_archive) | |
645 | return ctf_archive_raw_iter_internal (arc->ctfi_archive, func, data); | |
646 | ||
647 | return -EINVAL; /* Not supported. */ | |
648 | } | |
649 | ||
650 | /* Iterate over all CTF files in an archive. We pass all CTF files in turn to | |
651 | the specified callback function. */ | |
652 | static int | |
653 | ctf_archive_iter_internal (const ctf_archive_t *wrapper, | |
654 | const struct ctf_archive *arc, | |
655 | const ctf_sect_t *symsect, | |
656 | const ctf_sect_t *strsect, | |
657 | ctf_archive_member_f *func, void *data) | |
658 | { | |
659 | int rc; | |
660 | size_t i; | |
661 | ctf_file_t *f; | |
662 | struct ctf_archive_modent *modent; | |
663 | const char *nametbl; | |
664 | ||
665 | modent = (ctf_archive_modent_t *) ((char *) arc | |
666 | + sizeof (struct ctf_archive)); | |
667 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); | |
668 | ||
669 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) | |
670 | { | |
671 | const char *name; | |
672 | ||
673 | name = &nametbl[le64toh (modent[i].name_offset)]; | |
674 | if ((f = ctf_arc_open_by_name_internal (arc, symsect, strsect, | |
675 | name, &rc)) == NULL) | |
676 | return rc; | |
677 | ||
678 | f->ctf_archive = (ctf_archive_t *) wrapper; | |
679 | if ((rc = func (f, name, data)) != 0) | |
680 | { | |
681 | ctf_file_close (f); | |
682 | return rc; | |
683 | } | |
684 | ||
685 | ctf_file_close (f); | |
686 | } | |
687 | return 0; | |
688 | } | |
689 | ||
690 | /* Iterate over all CTF files in an archive: public entry point. We pass all | |
691 | CTF files in turn to the specified callback function. */ | |
692 | int | |
693 | ctf_archive_iter (const ctf_archive_t *arc, ctf_archive_member_f *func, | |
694 | void *data) | |
695 | { | |
696 | const ctf_sect_t *symsect = &arc->ctfi_symsect; | |
697 | const ctf_sect_t *strsect = &arc->ctfi_strsect; | |
698 | ||
699 | if (symsect->cts_name == NULL) | |
700 | symsect = NULL; | |
701 | if (strsect->cts_name == NULL) | |
702 | strsect = NULL; | |
703 | ||
704 | if (arc->ctfi_is_archive) | |
705 | return ctf_archive_iter_internal (arc, arc->ctfi_archive, symsect, strsect, | |
706 | func, data); | |
707 | ||
708 | return func (arc->ctfi_file, _CTF_SECTION, data); | |
709 | } | |
710 | ||
711 | #ifdef HAVE_MMAP | |
712 | /* Map the header in. Only used on new, empty files. */ | |
713 | static void *arc_mmap_header (int fd, size_t headersz) | |
714 | { | |
715 | void *hdr; | |
716 | if ((hdr = mmap (NULL, headersz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, | |
717 | 0)) == MAP_FAILED) | |
718 | return NULL; | |
719 | return hdr; | |
720 | } | |
721 | ||
722 | /* mmap() the whole file, for reading only. (Map it writably, but privately: we | |
723 | need to modify the region, but don't need anyone else to see the | |
724 | modifications.) */ | |
725 | static void *arc_mmap_file (int fd, size_t size) | |
726 | { | |
727 | void *arc; | |
728 | if ((arc = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, | |
729 | fd, 0)) == MAP_FAILED) | |
730 | return NULL; | |
731 | return arc; | |
732 | } | |
733 | ||
734 | /* Persist the header to disk. */ | |
735 | static int arc_mmap_writeout (int fd _libctf_unused_, void *header, | |
736 | size_t headersz, const char **errmsg) | |
737 | { | |
738 | if (msync (header, headersz, MS_ASYNC) < 0) | |
739 | { | |
740 | if (errmsg) | |
741 | *errmsg = "arc_mmap_writeout(): Cannot sync after writing to %s: %s\n"; | |
742 | return -1; | |
743 | } | |
744 | return 0; | |
745 | } | |
746 | ||
747 | /* Unmap the region. */ | |
748 | static int arc_mmap_unmap (void *header, size_t headersz, const char **errmsg) | |
749 | { | |
750 | if (munmap (header, headersz) < 0) | |
751 | { | |
752 | if (errmsg) | |
753 | *errmsg = "arc_mmap_munmap(): Cannot unmap after writing to %s: %s\n"; | |
754 | return -1; | |
755 | } | |
756 | return 0; | |
757 | } | |
758 | #else | |
759 | /* Map the header in. Only used on new, empty files. */ | |
f5e73be1 | 760 | static void *arc_mmap_header (int fd _libctf_unused_, size_t headersz) |
9402cc59 NA |
761 | { |
762 | void *hdr; | |
763 | if ((hdr = malloc (headersz)) == NULL) | |
764 | return NULL; | |
765 | return hdr; | |
766 | } | |
767 | ||
768 | /* Pull in the whole file, for reading only. We assume the current file | |
769 | position is at the start of the file. */ | |
770 | static void *arc_mmap_file (int fd, size_t size) | |
771 | { | |
772 | char *data; | |
773 | ||
774 | if ((data = malloc (size)) == NULL) | |
775 | return NULL; | |
776 | ||
777 | if (ctf_pread (fd, data, size, 0) < 0) | |
778 | { | |
779 | free (data); | |
780 | return NULL; | |
781 | } | |
782 | return data; | |
783 | } | |
784 | ||
785 | /* Persist the header to disk. */ | |
786 | static int arc_mmap_writeout (int fd, void *header, size_t headersz, | |
787 | const char **errmsg) | |
788 | { | |
789 | ssize_t len; | |
790 | size_t acc = 0; | |
791 | char *data = (char *) header; | |
792 | ssize_t count = headersz; | |
793 | ||
794 | if ((lseek (fd, 0, SEEK_SET)) < 0) | |
795 | { | |
796 | if (errmsg) | |
797 | *errmsg = "arc_mmap_writeout(): Cannot seek while writing header to " | |
798 | "%s: %s\n"; | |
799 | return -1; | |
800 | } | |
801 | ||
802 | while (headersz > 0) | |
803 | { | |
804 | if ((len = write (fd, data, count)) < 0) | |
805 | { | |
806 | if (errmsg) | |
807 | *errmsg = "arc_mmap_writeout(): Cannot write header to %s: %s\n"; | |
808 | return len; | |
809 | } | |
810 | if (len == EINTR) | |
811 | continue; | |
812 | ||
813 | acc += len; | |
814 | if (len == 0) /* EOF. */ | |
815 | break; | |
816 | ||
817 | count -= len; | |
818 | data += len; | |
819 | } | |
820 | return 0; | |
821 | } | |
822 | ||
823 | /* Unmap the region. */ | |
824 | static int arc_mmap_unmap (void *header, size_t headersz _libctf_unused_, | |
825 | const char **errmsg _libctf_unused_) | |
826 | { | |
827 | free (header); | |
828 | return 0; | |
829 | } | |
830 | #endif |