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