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