| 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 "ctf-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 to the start of the file referenced by the passed-in |
| 51 | fd. The entries in CTF_FILES are referenced by name: the names are passed in |
| 52 | the names array, which must have CTF_FILES entries. |
| 53 | |
| 54 | Returns 0 on success, or an errno, or an ECTF_* value. */ |
| 55 | int |
| 56 | ctf_arc_write_fd (int fd, ctf_file_t **ctf_files, size_t ctf_file_cnt, |
| 57 | const char **names, size_t threshold) |
| 58 | { |
| 59 | const char *errmsg; |
| 60 | struct ctf_archive *archdr; |
| 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 CTF archive with %lu files\n", |
| 72 | (unsigned long) ctf_file_cnt); |
| 73 | |
| 74 | /* Figure out the size of the mmap()ed header, including the |
| 75 | ctf_archive_modent array. We assume that all of this needs no |
| 76 | padding: a likely assumption, given that it's all made up of |
| 77 | uint64_t's. */ |
| 78 | headersz = sizeof (struct ctf_archive) |
| 79 | + (ctf_file_cnt * sizeof (uint64_t) * 2); |
| 80 | ctf_dprintf ("headersz is %lu\n", (unsigned long) headersz); |
| 81 | |
| 82 | /* From now on we work in two pieces: an mmap()ed region from zero up to the |
| 83 | headersz, and a region updated via write() starting after that, containing |
| 84 | all the tables. Platforms that do not support mmap() just use write(). */ |
| 85 | ctf_startoffs = headersz; |
| 86 | if (lseek (fd, ctf_startoffs - 1, SEEK_SET) < 0) |
| 87 | { |
| 88 | errmsg = "ctf_arc_write(): cannot extend file while writing: %s\n"; |
| 89 | goto err; |
| 90 | } |
| 91 | |
| 92 | if (write (fd, &dummy, 1) < 0) |
| 93 | { |
| 94 | errmsg = "ctf_arc_write(): cannot extend file while writing: %s\n"; |
| 95 | goto err; |
| 96 | } |
| 97 | |
| 98 | if ((archdr = arc_mmap_header (fd, headersz)) == NULL) |
| 99 | { |
| 100 | errmsg = "ctf_arc_write(): Cannot mmap(): %s\n"; |
| 101 | goto err; |
| 102 | } |
| 103 | |
| 104 | /* Fill in everything we can, which is everything other than the name |
| 105 | table offset. */ |
| 106 | archdr->ctfa_magic = htole64 (CTFA_MAGIC); |
| 107 | archdr->ctfa_nfiles = htole64 (ctf_file_cnt); |
| 108 | archdr->ctfa_ctfs = htole64 (ctf_startoffs); |
| 109 | |
| 110 | /* We could validate that all CTF files have the same data model, but |
| 111 | since any reasonable construction process will be building things of |
| 112 | only one bitness anyway, this is pretty pointless, so just use the |
| 113 | model of the first CTF file for all of them. (It *is* valid to |
| 114 | create an empty archive: the value of ctfa_model is irrelevant in |
| 115 | this case, but we must be sure not to dereference uninitialized |
| 116 | memory.) */ |
| 117 | |
| 118 | if (ctf_file_cnt > 0) |
| 119 | archdr->ctfa_model = htole64 (ctf_getmodel (ctf_files[0])); |
| 120 | |
| 121 | /* Now write out the CTFs: ctf_archive_modent array via the mapping, |
| 122 | ctfs via write(). The names themselves have not been written yet: we |
| 123 | track them in a local strtab until the time is right, and sort the |
| 124 | modents array after construction. |
| 125 | |
| 126 | The name table is not sorted. */ |
| 127 | |
| 128 | for (i = 0, namesz = 0; i < le64toh (archdr->ctfa_nfiles); i++) |
| 129 | namesz += strlen (names[i]) + 1; |
| 130 | |
| 131 | nametbl = malloc (namesz); |
| 132 | if (nametbl == NULL) |
| 133 | { |
| 134 | errmsg = "Error writing named CTF to archive: %s\n"; |
| 135 | goto err_unmap; |
| 136 | } |
| 137 | |
| 138 | for (i = 0, namesz = 0, |
| 139 | modent = (ctf_archive_modent_t *) ((char *) archdr |
| 140 | + sizeof (struct ctf_archive)); |
| 141 | i < le64toh (archdr->ctfa_nfiles); i++) |
| 142 | { |
| 143 | off_t off; |
| 144 | |
| 145 | strcpy (&nametbl[namesz], names[i]); |
| 146 | |
| 147 | off = arc_write_one_ctf (ctf_files[i], fd, threshold); |
| 148 | if ((off < 0) && (off > -ECTF_BASE)) |
| 149 | { |
| 150 | errmsg = "ctf_arc_write(): Cannot determine file " |
| 151 | "position while writing to archive: %s"; |
| 152 | goto err_free; |
| 153 | } |
| 154 | if (off < 0) |
| 155 | { |
| 156 | errmsg = "ctf_arc_write(): Cannot write CTF file to archive: %s\n"; |
| 157 | errno = off * -1; |
| 158 | goto err_free; |
| 159 | } |
| 160 | |
| 161 | modent->name_offset = htole64 (namesz); |
| 162 | modent->ctf_offset = htole64 (off - ctf_startoffs); |
| 163 | namesz += strlen (names[i]) + 1; |
| 164 | modent++; |
| 165 | } |
| 166 | |
| 167 | ctf_qsort_r ((ctf_archive_modent_t *) ((char *) archdr |
| 168 | + sizeof (struct ctf_archive)), |
| 169 | le64toh (archdr->ctfa_nfiles), |
| 170 | sizeof (struct ctf_archive_modent), sort_modent_by_name, |
| 171 | nametbl); |
| 172 | |
| 173 | /* Now the name table. */ |
| 174 | |
| 175 | if ((nameoffs = lseek (fd, 0, SEEK_CUR)) < 0) |
| 176 | { |
| 177 | errmsg = "ctf_arc_write(): Cannot get current file position " |
| 178 | "in archive: %s\n"; |
| 179 | goto err_free; |
| 180 | } |
| 181 | archdr->ctfa_names = htole64 (nameoffs); |
| 182 | np = nametbl; |
| 183 | while (namesz > 0) |
| 184 | { |
| 185 | ssize_t len; |
| 186 | if ((len = write (fd, np, namesz)) < 0) |
| 187 | { |
| 188 | errmsg = "ctf_arc_write(): Cannot write name table to archive: %s\n"; |
| 189 | goto err_free; |
| 190 | } |
| 191 | namesz -= len; |
| 192 | np += len; |
| 193 | } |
| 194 | free (nametbl); |
| 195 | |
| 196 | if (arc_mmap_writeout (fd, archdr, headersz, &errmsg) < 0) |
| 197 | goto err_unmap; |
| 198 | if (arc_mmap_unmap (archdr, headersz, &errmsg) < 0) |
| 199 | goto err; |
| 200 | return 0; |
| 201 | |
| 202 | err_free: |
| 203 | free (nametbl); |
| 204 | err_unmap: |
| 205 | arc_mmap_unmap (archdr, headersz, NULL); |
| 206 | err: |
| 207 | ctf_dprintf (errmsg, errno < ECTF_BASE ? strerror (errno) : |
| 208 | ctf_errmsg (errno)); |
| 209 | return errno; |
| 210 | } |
| 211 | |
| 212 | /* Write out a CTF archive. The entries in CTF_FILES are referenced by name: |
| 213 | the names are passed in the names array, which must have CTF_FILES entries. |
| 214 | |
| 215 | If the filename is NULL, create a temporary file and return a pointer to it. |
| 216 | |
| 217 | Returns 0 on success, or an errno, or an ECTF_* value. */ |
| 218 | int |
| 219 | ctf_arc_write (const char *file, ctf_file_t ** ctf_files, size_t ctf_file_cnt, |
| 220 | const char **names, size_t threshold) |
| 221 | { |
| 222 | int err; |
| 223 | int fd; |
| 224 | |
| 225 | if ((fd = open (file, O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0666)) < 0) |
| 226 | { |
| 227 | ctf_dprintf ("ctf_arc_write(): cannot create %s: %s\n", file, |
| 228 | strerror (errno)); |
| 229 | return errno; |
| 230 | } |
| 231 | |
| 232 | err = ctf_arc_write_fd (fd, ctf_files, ctf_file_cnt, names, threshold); |
| 233 | if (err) |
| 234 | goto err; |
| 235 | |
| 236 | if ((err = close (fd)) < 0) |
| 237 | { |
| 238 | ctf_dprintf ("ctf_arc_write(): Cannot close after writing to archive: " |
| 239 | "%s\n", strerror (errno)); |
| 240 | goto err_close; |
| 241 | } |
| 242 | |
| 243 | err: |
| 244 | close (fd); |
| 245 | if (err < 0) |
| 246 | unlink (file); |
| 247 | |
| 248 | return err; |
| 249 | |
| 250 | err_close: |
| 251 | if (err < 0) |
| 252 | unlink (file); |
| 253 | |
| 254 | return err; |
| 255 | } |
| 256 | |
| 257 | /* Write one CTF file out. Return the file position of the written file (or |
| 258 | rather, of the file-size uint64_t that precedes it): negative return is a |
| 259 | negative errno or ctf_errno value. On error, the file position may no longer |
| 260 | be at the end of the file. */ |
| 261 | static off_t |
| 262 | arc_write_one_ctf (ctf_file_t * f, int fd, size_t threshold) |
| 263 | { |
| 264 | off_t off, end_off; |
| 265 | uint64_t ctfsz = 0; |
| 266 | char *ctfszp; |
| 267 | size_t ctfsz_len; |
| 268 | int (*writefn) (ctf_file_t * fp, int fd); |
| 269 | |
| 270 | if (ctf_serialize (f) < 0) |
| 271 | return f->ctf_errno * -1; |
| 272 | |
| 273 | if ((off = lseek (fd, 0, SEEK_CUR)) < 0) |
| 274 | return errno * -1; |
| 275 | |
| 276 | if (f->ctf_size > threshold) |
| 277 | writefn = ctf_compress_write; |
| 278 | else |
| 279 | writefn = ctf_write; |
| 280 | |
| 281 | /* This zero-write turns into the size in a moment. */ |
| 282 | ctfsz_len = sizeof (ctfsz); |
| 283 | ctfszp = (char *) &ctfsz; |
| 284 | while (ctfsz_len > 0) |
| 285 | { |
| 286 | ssize_t writelen = write (fd, ctfszp, ctfsz_len); |
| 287 | if (writelen < 0) |
| 288 | return errno * -1; |
| 289 | ctfsz_len -= writelen; |
| 290 | ctfszp += writelen; |
| 291 | } |
| 292 | |
| 293 | if (writefn (f, fd) != 0) |
| 294 | return f->ctf_errno * -1; |
| 295 | |
| 296 | if ((end_off = lseek (fd, 0, SEEK_CUR)) < 0) |
| 297 | return errno * -1; |
| 298 | ctfsz = htole64 (end_off - off); |
| 299 | |
| 300 | if ((lseek (fd, off, SEEK_SET)) < 0) |
| 301 | return errno * -1; |
| 302 | |
| 303 | /* ... here. */ |
| 304 | ctfsz_len = sizeof (ctfsz); |
| 305 | ctfszp = (char *) &ctfsz; |
| 306 | while (ctfsz_len > 0) |
| 307 | { |
| 308 | ssize_t writelen = write (fd, ctfszp, ctfsz_len); |
| 309 | if (writelen < 0) |
| 310 | return errno * -1; |
| 311 | ctfsz_len -= writelen; |
| 312 | ctfszp += writelen; |
| 313 | } |
| 314 | |
| 315 | end_off = LCTF_ALIGN_OFFS (end_off, 8); |
| 316 | if ((lseek (fd, end_off, SEEK_SET)) < 0) |
| 317 | return errno * -1; |
| 318 | |
| 319 | return off; |
| 320 | } |
| 321 | |
| 322 | /* qsort() function to sort the array of struct ctf_archive_modents into |
| 323 | ascending name order. */ |
| 324 | static int |
| 325 | sort_modent_by_name (const void *one, const void *two, void *n) |
| 326 | { |
| 327 | const struct ctf_archive_modent *a = one; |
| 328 | const struct ctf_archive_modent *b = two; |
| 329 | char *nametbl = n; |
| 330 | |
| 331 | return strcmp (&nametbl[le64toh (a->name_offset)], |
| 332 | &nametbl[le64toh (b->name_offset)]); |
| 333 | } |
| 334 | |
| 335 | /* bsearch() function to search for a given name in the sorted array of struct |
| 336 | ctf_archive_modents. */ |
| 337 | static int |
| 338 | search_modent_by_name (const void *key, const void *ent) |
| 339 | { |
| 340 | const char *k = key; |
| 341 | const struct ctf_archive_modent *v = ent; |
| 342 | |
| 343 | return strcmp (k, &search_nametbl[le64toh (v->name_offset)]); |
| 344 | } |
| 345 | |
| 346 | /* A trivial wrapper: open a CTF archive, from data in a buffer (which the |
| 347 | caller must preserve until ctf_arc_close() time). Returns the archive, or |
| 348 | NULL and an error in *err (if not NULL). */ |
| 349 | struct ctf_archive * |
| 350 | ctf_arc_bufopen (const void *buf, size_t size _libctf_unused_, int *errp) |
| 351 | { |
| 352 | struct ctf_archive *arc = (struct ctf_archive *) buf; |
| 353 | |
| 354 | if (le64toh (arc->ctfa_magic) != CTFA_MAGIC) |
| 355 | { |
| 356 | if (errp) |
| 357 | *errp = ECTF_FMT; |
| 358 | return NULL; |
| 359 | } |
| 360 | return arc; |
| 361 | } |
| 362 | |
| 363 | /* Open a CTF archive. Returns the archive, or NULL and an error in *err (if |
| 364 | not NULL). */ |
| 365 | struct ctf_archive * |
| 366 | ctf_arc_open_internal (const char *filename, int *errp) |
| 367 | { |
| 368 | const char *errmsg; |
| 369 | int fd; |
| 370 | struct stat s; |
| 371 | struct ctf_archive *arc; /* (Actually the whole file.) */ |
| 372 | |
| 373 | libctf_init_debug(); |
| 374 | if ((fd = open (filename, O_RDONLY)) < 0) |
| 375 | { |
| 376 | errmsg = "ctf_arc_open(): cannot open %s: %s\n"; |
| 377 | goto err; |
| 378 | } |
| 379 | if (fstat (fd, &s) < 0) |
| 380 | { |
| 381 | errmsg = "ctf_arc_open(): cannot stat %s: %s\n"; |
| 382 | goto err_close; |
| 383 | } |
| 384 | |
| 385 | if ((arc = arc_mmap_file (fd, s.st_size)) == NULL) |
| 386 | { |
| 387 | errmsg = "ctf_arc_open(): Cannot read in %s: %s\n"; |
| 388 | goto err_close; |
| 389 | } |
| 390 | |
| 391 | if (le64toh (arc->ctfa_magic) != CTFA_MAGIC) |
| 392 | { |
| 393 | errmsg = "ctf_arc_open(): Invalid magic number"; |
| 394 | errno = ECTF_FMT; |
| 395 | goto err_unmap; |
| 396 | } |
| 397 | |
| 398 | /* This horrible hack lets us know how much to unmap when the file is |
| 399 | closed. (We no longer need the magic number, and the mapping |
| 400 | is private.) */ |
| 401 | arc->ctfa_magic = s.st_size; |
| 402 | close (fd); |
| 403 | return arc; |
| 404 | |
| 405 | err_unmap: |
| 406 | arc_mmap_unmap (arc, s.st_size, NULL); |
| 407 | err_close: |
| 408 | close (fd); |
| 409 | err: |
| 410 | if (errp) |
| 411 | *errp = errno; |
| 412 | ctf_dprintf (errmsg, filename, errno < ECTF_BASE ? strerror (errno) : |
| 413 | ctf_errmsg (errno)); |
| 414 | return NULL; |
| 415 | } |
| 416 | |
| 417 | /* Close an archive. */ |
| 418 | void |
| 419 | ctf_arc_close_internal (struct ctf_archive *arc) |
| 420 | { |
| 421 | if (arc == NULL) |
| 422 | return; |
| 423 | |
| 424 | /* See the comment in ctf_arc_open(). */ |
| 425 | arc_mmap_unmap (arc, arc->ctfa_magic, NULL); |
| 426 | } |
| 427 | |
| 428 | /* Public entry point: close an archive, or CTF file. */ |
| 429 | void |
| 430 | ctf_arc_close (ctf_archive_t *arc) |
| 431 | { |
| 432 | if (arc == NULL) |
| 433 | return; |
| 434 | |
| 435 | if (arc->ctfi_is_archive) |
| 436 | ctf_arc_close_internal (arc->ctfi_archive); |
| 437 | else |
| 438 | ctf_file_close (arc->ctfi_file); |
| 439 | free ((void *) arc->ctfi_symsect.cts_data); |
| 440 | /* Do not free the ctfi_strsect: it is bound to the bfd. */ |
| 441 | free (arc->ctfi_data); |
| 442 | if (arc->ctfi_bfd_close) |
| 443 | arc->ctfi_bfd_close (arc); |
| 444 | free (arc); |
| 445 | } |
| 446 | |
| 447 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if |
| 448 | non-NULL. A name of NULL means to open the default file. */ |
| 449 | static ctf_file_t * |
| 450 | ctf_arc_open_by_name_internal (const struct ctf_archive *arc, |
| 451 | const ctf_sect_t *symsect, |
| 452 | const ctf_sect_t *strsect, |
| 453 | const char *name, int *errp) |
| 454 | { |
| 455 | struct ctf_archive_modent *modent; |
| 456 | |
| 457 | if (name == NULL) |
| 458 | name = _CTF_SECTION; /* The default name. */ |
| 459 | |
| 460 | ctf_dprintf ("ctf_arc_open_by_name(%s): opening\n", name); |
| 461 | |
| 462 | modent = (ctf_archive_modent_t *) ((char *) arc |
| 463 | + sizeof (struct ctf_archive)); |
| 464 | |
| 465 | search_nametbl = (char *) arc + le64toh (arc->ctfa_names); |
| 466 | modent = bsearch (name, modent, le64toh (arc->ctfa_nfiles), |
| 467 | sizeof (struct ctf_archive_modent), |
| 468 | search_modent_by_name); |
| 469 | |
| 470 | /* This is actually a common case and normal operation: no error |
| 471 | debug output. */ |
| 472 | if (modent == NULL) |
| 473 | { |
| 474 | if (errp) |
| 475 | *errp = ECTF_ARNNAME; |
| 476 | return NULL; |
| 477 | } |
| 478 | |
| 479 | return ctf_arc_open_by_offset (arc, symsect, strsect, |
| 480 | le64toh (modent->ctf_offset), errp); |
| 481 | } |
| 482 | |
| 483 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if |
| 484 | non-NULL. A name of NULL means to open the default file. |
| 485 | |
| 486 | Use the specified string and symbol table sections. |
| 487 | |
| 488 | Public entry point. */ |
| 489 | ctf_file_t * |
| 490 | ctf_arc_open_by_name_sections (const ctf_archive_t *arc, |
| 491 | const ctf_sect_t *symsect, |
| 492 | const ctf_sect_t *strsect, |
| 493 | const char *name, |
| 494 | int *errp) |
| 495 | { |
| 496 | if (arc->ctfi_is_archive) |
| 497 | { |
| 498 | ctf_file_t *ret; |
| 499 | ret = ctf_arc_open_by_name_internal (arc->ctfi_archive, symsect, strsect, |
| 500 | name, errp); |
| 501 | if (ret) |
| 502 | ret->ctf_archive = (ctf_archive_t *) arc; |
| 503 | return ret; |
| 504 | } |
| 505 | |
| 506 | if ((name != NULL) && (strcmp (name, _CTF_SECTION) != 0)) |
| 507 | { |
| 508 | if (errp) |
| 509 | *errp = ECTF_ARNNAME; |
| 510 | return NULL; |
| 511 | } |
| 512 | arc->ctfi_file->ctf_archive = (ctf_archive_t *) arc; |
| 513 | |
| 514 | /* Bump the refcount so that the user can ctf_file_close() it. */ |
| 515 | arc->ctfi_file->ctf_refcnt++; |
| 516 | return arc->ctfi_file; |
| 517 | } |
| 518 | |
| 519 | /* Return the ctf_file_t with the given name, or NULL if none, setting 'err' if |
| 520 | non-NULL. A name of NULL means to open the default file. |
| 521 | |
| 522 | Public entry point. */ |
| 523 | ctf_file_t * |
| 524 | ctf_arc_open_by_name (const ctf_archive_t *arc, const char *name, int *errp) |
| 525 | { |
| 526 | const ctf_sect_t *symsect = &arc->ctfi_symsect; |
| 527 | const ctf_sect_t *strsect = &arc->ctfi_strsect; |
| 528 | |
| 529 | if (symsect->cts_name == NULL) |
| 530 | symsect = NULL; |
| 531 | if (strsect->cts_name == NULL) |
| 532 | strsect = NULL; |
| 533 | |
| 534 | return ctf_arc_open_by_name_sections (arc, symsect, strsect, name, errp); |
| 535 | } |
| 536 | |
| 537 | /* Return the ctf_file_t at the given ctfa_ctfs-relative offset, or NULL if |
| 538 | none, setting 'err' if non-NULL. */ |
| 539 | static ctf_file_t * |
| 540 | ctf_arc_open_by_offset (const struct ctf_archive *arc, |
| 541 | const ctf_sect_t *symsect, |
| 542 | const ctf_sect_t *strsect, size_t offset, |
| 543 | int *errp) |
| 544 | { |
| 545 | ctf_sect_t ctfsect; |
| 546 | ctf_file_t *fp; |
| 547 | |
| 548 | ctf_dprintf ("ctf_arc_open_by_offset(%lu): opening\n", (unsigned long) offset); |
| 549 | |
| 550 | memset (&ctfsect, 0, sizeof (ctf_sect_t)); |
| 551 | |
| 552 | offset += le64toh (arc->ctfa_ctfs); |
| 553 | |
| 554 | ctfsect.cts_name = _CTF_SECTION; |
| 555 | ctfsect.cts_size = le64toh (*((uint64_t *) ((char *) arc + offset))); |
| 556 | ctfsect.cts_entsize = 1; |
| 557 | ctfsect.cts_data = (void *) ((char *) arc + offset + sizeof (uint64_t)); |
| 558 | fp = ctf_bufopen (&ctfsect, symsect, strsect, errp); |
| 559 | if (fp) |
| 560 | ctf_setmodel (fp, le64toh (arc->ctfa_model)); |
| 561 | return fp; |
| 562 | } |
| 563 | |
| 564 | /* Raw iteration over all CTF files in an archive. We pass the raw data for all |
| 565 | CTF files in turn to the specified callback function. */ |
| 566 | static int |
| 567 | ctf_archive_raw_iter_internal (const struct ctf_archive *arc, |
| 568 | ctf_archive_raw_member_f *func, void *data) |
| 569 | { |
| 570 | int rc; |
| 571 | size_t i; |
| 572 | struct ctf_archive_modent *modent; |
| 573 | const char *nametbl; |
| 574 | |
| 575 | modent = (ctf_archive_modent_t *) ((char *) arc |
| 576 | + sizeof (struct ctf_archive)); |
| 577 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); |
| 578 | |
| 579 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) |
| 580 | { |
| 581 | const char *name; |
| 582 | char *fp; |
| 583 | |
| 584 | name = &nametbl[le64toh (modent[i].name_offset)]; |
| 585 | fp = ((char *) arc + le64toh (arc->ctfa_ctfs) |
| 586 | + le64toh (modent[i].ctf_offset)); |
| 587 | |
| 588 | if ((rc = func (name, (void *) (fp + sizeof (uint64_t)), |
| 589 | le64toh (*((uint64_t *) fp)), data)) != 0) |
| 590 | return rc; |
| 591 | } |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | /* Raw iteration over all CTF files in an archive: public entry point. |
| 596 | |
| 597 | Returns -EINVAL if not supported for this sort of archive. */ |
| 598 | int |
| 599 | ctf_archive_raw_iter (const ctf_archive_t *arc, |
| 600 | ctf_archive_raw_member_f * func, void *data) |
| 601 | { |
| 602 | if (arc->ctfi_is_archive) |
| 603 | return ctf_archive_raw_iter_internal (arc->ctfi_archive, func, data); |
| 604 | |
| 605 | return -EINVAL; /* Not supported. */ |
| 606 | } |
| 607 | |
| 608 | /* Iterate over all CTF files in an archive. We pass all CTF files in turn to |
| 609 | the specified callback function. */ |
| 610 | static int |
| 611 | ctf_archive_iter_internal (const ctf_archive_t *wrapper, |
| 612 | const struct ctf_archive *arc, |
| 613 | const ctf_sect_t *symsect, |
| 614 | const ctf_sect_t *strsect, |
| 615 | ctf_archive_member_f *func, void *data) |
| 616 | { |
| 617 | int rc; |
| 618 | size_t i; |
| 619 | ctf_file_t *f; |
| 620 | struct ctf_archive_modent *modent; |
| 621 | const char *nametbl; |
| 622 | |
| 623 | modent = (ctf_archive_modent_t *) ((char *) arc |
| 624 | + sizeof (struct ctf_archive)); |
| 625 | nametbl = (((const char *) arc) + le64toh (arc->ctfa_names)); |
| 626 | |
| 627 | for (i = 0; i < le64toh (arc->ctfa_nfiles); i++) |
| 628 | { |
| 629 | const char *name; |
| 630 | |
| 631 | name = &nametbl[le64toh (modent[i].name_offset)]; |
| 632 | if ((f = ctf_arc_open_by_name_internal (arc, symsect, strsect, |
| 633 | name, &rc)) == NULL) |
| 634 | return rc; |
| 635 | |
| 636 | f->ctf_archive = (ctf_archive_t *) wrapper; |
| 637 | if ((rc = func (f, name, data)) != 0) |
| 638 | { |
| 639 | ctf_file_close (f); |
| 640 | return rc; |
| 641 | } |
| 642 | |
| 643 | ctf_file_close (f); |
| 644 | } |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | /* Iterate over all CTF files in an archive: public entry point. We pass all |
| 649 | CTF files in turn to the specified callback function. */ |
| 650 | int |
| 651 | ctf_archive_iter (const ctf_archive_t *arc, ctf_archive_member_f *func, |
| 652 | void *data) |
| 653 | { |
| 654 | const ctf_sect_t *symsect = &arc->ctfi_symsect; |
| 655 | const ctf_sect_t *strsect = &arc->ctfi_strsect; |
| 656 | |
| 657 | if (symsect->cts_name == NULL) |
| 658 | symsect = NULL; |
| 659 | if (strsect->cts_name == NULL) |
| 660 | strsect = NULL; |
| 661 | |
| 662 | if (arc->ctfi_is_archive) |
| 663 | return ctf_archive_iter_internal (arc, arc->ctfi_archive, symsect, strsect, |
| 664 | func, data); |
| 665 | |
| 666 | return func (arc->ctfi_file, _CTF_SECTION, data); |
| 667 | } |
| 668 | |
| 669 | #ifdef HAVE_MMAP |
| 670 | /* Map the header in. Only used on new, empty files. */ |
| 671 | static void *arc_mmap_header (int fd, size_t headersz) |
| 672 | { |
| 673 | void *hdr; |
| 674 | if ((hdr = mmap (NULL, headersz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, |
| 675 | 0)) == MAP_FAILED) |
| 676 | return NULL; |
| 677 | return hdr; |
| 678 | } |
| 679 | |
| 680 | /* mmap() the whole file, for reading only. (Map it writably, but privately: we |
| 681 | need to modify the region, but don't need anyone else to see the |
| 682 | modifications.) */ |
| 683 | static void *arc_mmap_file (int fd, size_t size) |
| 684 | { |
| 685 | void *arc; |
| 686 | if ((arc = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, |
| 687 | fd, 0)) == MAP_FAILED) |
| 688 | return NULL; |
| 689 | return arc; |
| 690 | } |
| 691 | |
| 692 | /* Persist the header to disk. */ |
| 693 | static int arc_mmap_writeout (int fd _libctf_unused_, void *header, |
| 694 | size_t headersz, const char **errmsg) |
| 695 | { |
| 696 | if (msync (header, headersz, MS_ASYNC) < 0) |
| 697 | { |
| 698 | if (errmsg) |
| 699 | *errmsg = "arc_mmap_writeout(): Cannot sync after writing to %s: %s\n"; |
| 700 | return -1; |
| 701 | } |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | /* Unmap the region. */ |
| 706 | static int arc_mmap_unmap (void *header, size_t headersz, const char **errmsg) |
| 707 | { |
| 708 | if (munmap (header, headersz) < 0) |
| 709 | { |
| 710 | if (errmsg) |
| 711 | *errmsg = "arc_mmap_munmap(): Cannot unmap after writing to %s: %s\n"; |
| 712 | return -1; |
| 713 | } |
| 714 | return 0; |
| 715 | } |
| 716 | #else |
| 717 | /* Map the header in. Only used on new, empty files. */ |
| 718 | static void *arc_mmap_header (int fd _libctf_unused_, size_t headersz) |
| 719 | { |
| 720 | void *hdr; |
| 721 | if ((hdr = malloc (headersz)) == NULL) |
| 722 | return NULL; |
| 723 | return hdr; |
| 724 | } |
| 725 | |
| 726 | /* Pull in the whole file, for reading only. We assume the current file |
| 727 | position is at the start of the file. */ |
| 728 | static void *arc_mmap_file (int fd, size_t size) |
| 729 | { |
| 730 | char *data; |
| 731 | |
| 732 | if ((data = malloc (size)) == NULL) |
| 733 | return NULL; |
| 734 | |
| 735 | if (ctf_pread (fd, data, size, 0) < 0) |
| 736 | { |
| 737 | free (data); |
| 738 | return NULL; |
| 739 | } |
| 740 | return data; |
| 741 | } |
| 742 | |
| 743 | /* Persist the header to disk. */ |
| 744 | static int arc_mmap_writeout (int fd, void *header, size_t headersz, |
| 745 | const char **errmsg) |
| 746 | { |
| 747 | ssize_t len; |
| 748 | size_t acc = 0; |
| 749 | char *data = (char *) header; |
| 750 | ssize_t count = headersz; |
| 751 | |
| 752 | if ((lseek (fd, 0, SEEK_SET)) < 0) |
| 753 | { |
| 754 | if (errmsg) |
| 755 | *errmsg = "arc_mmap_writeout(): Cannot seek while writing header to " |
| 756 | "%s: %s\n"; |
| 757 | return -1; |
| 758 | } |
| 759 | |
| 760 | while (headersz > 0) |
| 761 | { |
| 762 | if ((len = write (fd, data, count)) < 0) |
| 763 | { |
| 764 | if (errmsg) |
| 765 | *errmsg = "arc_mmap_writeout(): Cannot write header to %s: %s\n"; |
| 766 | return len; |
| 767 | } |
| 768 | if (len == EINTR) |
| 769 | continue; |
| 770 | |
| 771 | acc += len; |
| 772 | if (len == 0) /* EOF. */ |
| 773 | break; |
| 774 | |
| 775 | count -= len; |
| 776 | data += len; |
| 777 | } |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | /* Unmap the region. */ |
| 782 | static int arc_mmap_unmap (void *header, size_t headersz _libctf_unused_, |
| 783 | const char **errmsg _libctf_unused_) |
| 784 | { |
| 785 | free (header); |
| 786 | return 0; |
| 787 | } |
| 788 | #endif |