1 /* 2 * Copyright (c) Ian F. Darwin 1986-1995. 3 * Software written by Ian F. Darwin and others; 4 * maintained 1995-present by Christos Zoulas and others. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice immediately at the beginning of the file, without modification, 11 * this list of conditions, and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 /* 29 * compress routines: 30 * zmagic() - returns 0 if not recognized, uncompresses and prints 31 * information if recognized 32 * uncompress(method, old, n, newch) - uncompress old into new, 33 * using method, return sizeof new 34 */ 35 #include "file.h" 36 37 #ifndef lint 38 FILE_RCSID("@(#)$File: compress.c,v 1.106 2017/11/02 20:25:39 christos Exp $") 39 #endif 40 41 #include "magic.h" 42 #include <stdlib.h> 43 #ifdef HAVE_UNISTD_H 44 #include <unistd.h> 45 #endif 46 #include <string.h> 47 #include <errno.h> 48 #include <ctype.h> 49 #include <stdarg.h> 50 #ifdef HAVE_SIGNAL_H 51 #include <signal.h> 52 # ifndef HAVE_SIG_T 53 typedef void (*sig_t)(int); 54 # endif /* HAVE_SIG_T */ 55 #endif 56 #if !defined(__MINGW32__) && !defined(WIN32) 57 #include <sys/ioctl.h> 58 #endif 59 #ifdef HAVE_SYS_WAIT_H 60 #include <sys/wait.h> 61 #endif 62 #if defined(HAVE_SYS_TIME_H) 63 #include <sys/time.h> 64 #endif 65 #if defined(HAVE_ZLIB_H) && defined(ZLIBSUPPORT) 66 #define BUILTIN_DECOMPRESS 67 #include <zlib.h> 68 #endif 69 #ifdef DEBUG 70 int tty = -1; 71 #define DPRINTF(...) do { \ 72 if (tty == -1) \ 73 tty = open("/dev/tty", O_RDWR); \ 74 if (tty == -1) \ 75 abort(); \ 76 dprintf(tty, __VA_ARGS__); \ 77 } while (/*CONSTCOND*/0) 78 #else 79 #define DPRINTF(...) 80 #endif 81 82 #ifdef ZLIBSUPPORT 83 /* 84 * The following python code is not really used because ZLIBSUPPORT is only 85 * defined if we have a built-in zlib, and the built-in zlib handles that. 86 * That is not true for android where we have zlib.h and not -lz. 87 */ 88 static const char zlibcode[] = 89 "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))"; 90 91 static const char *zlib_args[] = { "python", "-c", zlibcode, NULL }; 92 93 static int 94 zlibcmp(const unsigned char *buf) 95 { 96 unsigned short x = 1; 97 unsigned char *s = CAST(unsigned char *, CAST(void *, &x)); 98 99 if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0) 100 return 0; 101 if (s[0] != 1) /* endianness test */ 102 x = buf[0] | (buf[1] << 8); 103 else 104 x = buf[1] | (buf[0] << 8); 105 if (x % 31) 106 return 0; 107 return 1; 108 } 109 #endif 110 111 #define gzip_flags "-cd" 112 #define lrzip_flags "-do" 113 #define lzip_flags gzip_flags 114 115 static const char *gzip_args[] = { 116 "gzip", gzip_flags, NULL 117 }; 118 static const char *uncompress_args[] = { 119 "uncompress", "-c", NULL 120 }; 121 static const char *bzip2_args[] = { 122 "bzip2", "-cd", NULL 123 }; 124 static const char *lzip_args[] = { 125 "lzip", lzip_flags, NULL 126 }; 127 static const char *xz_args[] = { 128 "xz", "-cd", NULL 129 }; 130 static const char *lrzip_args[] = { 131 "lrzip", lrzip_flags, NULL 132 }; 133 static const char *lz4_args[] = { 134 "lz4", "-cd", NULL 135 }; 136 static const char *zstd_args[] = { 137 "zstd", "-cd", NULL 138 }; 139 140 private const struct { 141 const void *magic; 142 size_t maglen; 143 const char **argv; 144 } compr[] = { 145 { "\037\235", 2, gzip_args }, /* compressed */ 146 /* Uncompress can get stuck; so use gzip first if we have it 147 * Idea from Damien Clark, thanks! */ 148 { "\037\235", 2, uncompress_args }, /* compressed */ 149 { "\037\213", 2, gzip_args }, /* gzipped */ 150 { "\037\236", 2, gzip_args }, /* frozen */ 151 { "\037\240", 2, gzip_args }, /* SCO LZH */ 152 /* the standard pack utilities do not accept standard input */ 153 { "\037\036", 2, gzip_args }, /* packed */ 154 { "PK\3\4", 4, gzip_args }, /* pkzipped, */ 155 /* ...only first file examined */ 156 { "BZh", 3, bzip2_args }, /* bzip2-ed */ 157 { "LZIP", 4, lzip_args }, /* lzip-ed */ 158 { "\3757zXZ\0", 6, xz_args }, /* XZ Utils */ 159 { "LRZI", 4, lrzip_args }, /* LRZIP */ 160 { "\004\"M\030",4, lz4_args }, /* LZ4 */ 161 { "\x28\xB5\x2F\xFD", 4, zstd_args }, /* zstd */ 162 #ifdef ZLIBSUPPORT 163 { RCAST(const void *, zlibcmp), 0, zlib_args }, /* zlib */ 164 #endif 165 }; 166 167 #define OKDATA 0 168 #define NODATA 1 169 #define ERRDATA 2 170 171 private ssize_t swrite(int, const void *, size_t); 172 #if HAVE_FORK 173 private size_t ncompr = sizeof(compr) / sizeof(compr[0]); 174 private int uncompressbuf(int, size_t, size_t, const unsigned char *, 175 unsigned char **, size_t *); 176 #ifdef BUILTIN_DECOMPRESS 177 private int uncompresszlib(const unsigned char *, unsigned char **, size_t, 178 size_t *, int); 179 private int uncompressgzipped(const unsigned char *, unsigned char **, size_t, 180 size_t *); 181 #endif 182 static int makeerror(unsigned char **, size_t *, const char *, ...) 183 __attribute__((__format__(__printf__, 3, 4))); 184 private const char *methodname(size_t); 185 186 protected int 187 file_zmagic(struct magic_set *ms, const struct buffer *b, const char *name) 188 { 189 unsigned char *newbuf = NULL; 190 size_t i, nsz; 191 char *rbuf; 192 file_pushbuf_t *pb; 193 int urv, prv, rv = 0; 194 int mime = ms->flags & MAGIC_MIME; 195 int fd = b->fd; 196 const unsigned char *buf = b->fbuf; 197 size_t nbytes = b->flen; 198 #ifdef HAVE_SIGNAL_H 199 sig_t osigpipe; 200 #endif 201 202 if ((ms->flags & MAGIC_COMPRESS) == 0) 203 return 0; 204 205 #ifdef HAVE_SIGNAL_H 206 osigpipe = signal(SIGPIPE, SIG_IGN); 207 #endif 208 for (i = 0; i < ncompr; i++) { 209 int zm; 210 if (nbytes < compr[i].maglen) 211 continue; 212 #ifdef ZLIBSUPPORT 213 if (compr[i].maglen == 0) 214 zm = (RCAST(int (*)(const unsigned char *), 215 CCAST(void *, compr[i].magic)))(buf); 216 else 217 #endif 218 zm = memcmp(buf, compr[i].magic, compr[i].maglen) == 0; 219 220 if (!zm) 221 continue; 222 nsz = nbytes; 223 urv = uncompressbuf(fd, ms->bytes_max, i, buf, &newbuf, &nsz); 224 DPRINTF("uncompressbuf = %d, %s, %zu\n", urv, (char *)newbuf, 225 nsz); 226 switch (urv) { 227 case OKDATA: 228 case ERRDATA: 229 230 ms->flags &= ~MAGIC_COMPRESS; 231 if (urv == ERRDATA) 232 prv = file_printf(ms, "%s ERROR: %s", 233 methodname(i), newbuf); 234 else 235 prv = file_buffer(ms, -1, name, newbuf, nsz); 236 if (prv == -1) 237 goto error; 238 rv = 1; 239 if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0) 240 goto out; 241 if (mime != MAGIC_MIME && mime != 0) 242 goto out; 243 if ((file_printf(ms, 244 mime ? " compressed-encoding=" : " (")) == -1) 245 goto error; 246 if ((pb = file_push_buffer(ms)) == NULL) 247 goto error; 248 /* 249 * XXX: If file_buffer fails here, we overwrite 250 * the compressed text. FIXME. 251 */ 252 if (file_buffer(ms, -1, NULL, buf, nbytes) == -1) 253 goto error; 254 if ((rbuf = file_pop_buffer(ms, pb)) != NULL) { 255 if (file_printf(ms, "%s", rbuf) == -1) { 256 free(rbuf); 257 goto error; 258 } 259 free(rbuf); 260 } 261 if (!mime && file_printf(ms, ")") == -1) 262 goto error; 263 /*FALLTHROUGH*/ 264 case NODATA: 265 break; 266 default: 267 abort(); 268 /*NOTREACHED*/ 269 error: 270 rv = -1; 271 break; 272 } 273 } 274 out: 275 DPRINTF("rv = %d\n", rv); 276 277 #ifdef HAVE_SIGNAL_H 278 (void)signal(SIGPIPE, osigpipe); 279 #endif 280 free(newbuf); 281 ms->flags |= MAGIC_COMPRESS; 282 DPRINTF("Zmagic returns %d\n", rv); 283 return rv; 284 } 285 #endif 286 /* 287 * `safe' write for sockets and pipes. 288 */ 289 private ssize_t 290 swrite(int fd, const void *buf, size_t n) 291 { 292 ssize_t rv; 293 size_t rn = n; 294 295 do 296 switch (rv = write(fd, buf, n)) { 297 case -1: 298 if (errno == EINTR) 299 continue; 300 return -1; 301 default: 302 n -= rv; 303 buf = CAST(const char *, buf) + rv; 304 break; 305 } 306 while (n > 0); 307 return rn; 308 } 309 310 311 /* 312 * `safe' read for sockets and pipes. 313 */ 314 protected ssize_t 315 sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__))) 316 { 317 ssize_t rv; 318 #ifdef FIONREAD 319 int t = 0; 320 #endif 321 size_t rn = n; 322 323 if (fd == STDIN_FILENO) 324 goto nocheck; 325 326 #ifdef FIONREAD 327 if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) { 328 #ifdef FD_ZERO 329 ssize_t cnt; 330 for (cnt = 0;; cnt++) { 331 fd_set check; 332 struct timeval tout = {0, 100 * 1000}; 333 int selrv; 334 335 FD_ZERO(&check); 336 FD_SET(fd, &check); 337 338 /* 339 * Avoid soft deadlock: do not read if there 340 * is nothing to read from sockets and pipes. 341 */ 342 selrv = select(fd + 1, &check, NULL, NULL, &tout); 343 if (selrv == -1) { 344 if (errno == EINTR || errno == EAGAIN) 345 continue; 346 } else if (selrv == 0 && cnt >= 5) { 347 return 0; 348 } else 349 break; 350 } 351 #endif 352 (void)ioctl(fd, FIONREAD, &t); 353 } 354 355 if (t > 0 && (size_t)t < n) { 356 n = t; 357 rn = n; 358 } 359 #endif 360 361 nocheck: 362 do 363 switch ((rv = read(fd, buf, n))) { 364 case -1: 365 if (errno == EINTR) 366 continue; 367 return -1; 368 case 0: 369 return rn - n; 370 default: 371 n -= rv; 372 buf = CAST(char *, CCAST(void *, buf)) + rv; 373 break; 374 } 375 while (n > 0); 376 return rn; 377 } 378 379 protected int 380 file_pipe2file(struct magic_set *ms, int fd, const void *startbuf, 381 size_t nbytes) 382 { 383 char buf[4096]; 384 ssize_t r; 385 int tfd; 386 387 (void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof buf); 388 #ifndef HAVE_MKSTEMP 389 { 390 char *ptr = mktemp(buf); 391 tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600); 392 r = errno; 393 (void)unlink(ptr); 394 errno = r; 395 } 396 #else 397 { 398 int te; 399 tfd = mkstemp(buf); 400 te = errno; 401 (void)unlink(buf); 402 errno = te; 403 } 404 #endif 405 if (tfd == -1) { 406 file_error(ms, errno, 407 "cannot create temporary file for pipe copy"); 408 return -1; 409 } 410 411 if (swrite(tfd, startbuf, nbytes) != (ssize_t)nbytes) 412 r = 1; 413 else { 414 while ((r = sread(fd, buf, sizeof(buf), 1)) > 0) 415 if (swrite(tfd, buf, (size_t)r) != r) 416 break; 417 } 418 419 switch (r) { 420 case -1: 421 file_error(ms, errno, "error copying from pipe to temp file"); 422 return -1; 423 case 0: 424 break; 425 default: 426 file_error(ms, errno, "error while writing to temp file"); 427 return -1; 428 } 429 430 /* 431 * We duplicate the file descriptor, because fclose on a 432 * tmpfile will delete the file, but any open descriptors 433 * can still access the phantom inode. 434 */ 435 if ((fd = dup2(tfd, fd)) == -1) { 436 file_error(ms, errno, "could not dup descriptor for temp file"); 437 return -1; 438 } 439 (void)close(tfd); 440 if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) { 441 file_badseek(ms); 442 return -1; 443 } 444 return fd; 445 } 446 #if HAVE_FORK 447 #ifdef BUILTIN_DECOMPRESS 448 449 #define FHCRC (1 << 1) 450 #define FEXTRA (1 << 2) 451 #define FNAME (1 << 3) 452 #define FCOMMENT (1 << 4) 453 454 455 private int 456 uncompressgzipped(const unsigned char *old, unsigned char **newch, 457 size_t bytes_max, size_t *n) 458 { 459 unsigned char flg = old[3]; 460 size_t data_start = 10; 461 462 if (flg & FEXTRA) { 463 if (data_start + 1 >= *n) 464 goto err; 465 data_start += 2 + old[data_start] + old[data_start + 1] * 256; 466 } 467 if (flg & FNAME) { 468 while(data_start < *n && old[data_start]) 469 data_start++; 470 data_start++; 471 } 472 if (flg & FCOMMENT) { 473 while(data_start < *n && old[data_start]) 474 data_start++; 475 data_start++; 476 } 477 if (flg & FHCRC) 478 data_start += 2; 479 480 if (data_start >= *n) 481 goto err; 482 483 *n -= data_start; 484 old += data_start; 485 return uncompresszlib(old, newch, bytes_max, n, 0); 486 err: 487 return makeerror(newch, n, "File too short"); 488 } 489 490 private int 491 uncompresszlib(const unsigned char *old, unsigned char **newch, 492 size_t bytes_max, size_t *n, int zlib) 493 { 494 int rc; 495 z_stream z; 496 497 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL) 498 return makeerror(newch, n, "No buffer, %s", strerror(errno)); 499 500 z.next_in = CCAST(Bytef *, old); 501 z.avail_in = CAST(uint32_t, *n); 502 z.next_out = *newch; 503 z.avail_out = CAST(unsigned int, bytes_max); 504 z.zalloc = Z_NULL; 505 z.zfree = Z_NULL; 506 z.opaque = Z_NULL; 507 508 /* LINTED bug in header macro */ 509 rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15); 510 if (rc != Z_OK) 511 goto err; 512 513 rc = inflate(&z, Z_SYNC_FLUSH); 514 if (rc != Z_OK && rc != Z_STREAM_END) 515 goto err; 516 517 *n = (size_t)z.total_out; 518 rc = inflateEnd(&z); 519 if (rc != Z_OK) 520 goto err; 521 522 /* let's keep the nul-terminate tradition */ 523 (*newch)[*n] = '\0'; 524 525 return OKDATA; 526 err: 527 strlcpy((char *)*newch, z.msg ? z.msg : zError(rc), bytes_max); 528 *n = strlen((char *)*newch); 529 return ERRDATA; 530 } 531 #endif 532 533 static int 534 makeerror(unsigned char **buf, size_t *len, const char *fmt, ...) 535 { 536 char *msg; 537 va_list ap; 538 int rv; 539 540 va_start(ap, fmt); 541 rv = vasprintf(&msg, fmt, ap); 542 va_end(ap); 543 if (rv < 0) { 544 *buf = NULL; 545 *len = 0; 546 return NODATA; 547 } 548 *buf = (unsigned char *)msg; 549 *len = strlen(msg); 550 return ERRDATA; 551 } 552 553 static void 554 closefd(int *fd, size_t i) 555 { 556 if (fd[i] == -1) 557 return; 558 (void) close(fd[i]); 559 fd[i] = -1; 560 } 561 562 static void 563 closep(int *fd) 564 { 565 size_t i; 566 for (i = 0; i < 2; i++) 567 closefd(fd, i); 568 } 569 570 static void 571 copydesc(int i, int *fd) 572 { 573 int j = fd[i == STDIN_FILENO ? 0 : 1]; 574 if (j == i) 575 return; 576 if (dup2(j, i) == -1) { 577 DPRINTF("dup(%d, %d) failed (%s)\n", j, i, strerror(errno)); 578 exit(1); 579 } 580 closep(fd); 581 } 582 583 static void 584 writechild(int fdp[3][2], const void *old, size_t n) 585 { 586 int status; 587 588 closefd(fdp[STDIN_FILENO], 0); 589 /* 590 * fork again, to avoid blocking because both 591 * pipes filled 592 */ 593 switch (fork()) { 594 case 0: /* child */ 595 closefd(fdp[STDOUT_FILENO], 0); 596 if (swrite(fdp[STDIN_FILENO][1], old, n) != (ssize_t)n) { 597 DPRINTF("Write failed (%s)\n", strerror(errno)); 598 exit(1); 599 } 600 exit(0); 601 /*NOTREACHED*/ 602 603 case -1: 604 DPRINTF("Fork failed (%s)\n", strerror(errno)); 605 exit(1); 606 /*NOTREACHED*/ 607 608 default: /* parent */ 609 if (wait(&status) == -1) { 610 DPRINTF("Wait failed (%s)\n", strerror(errno)); 611 exit(1); 612 } 613 DPRINTF("Grandchild wait return %#x\n", status); 614 } 615 closefd(fdp[STDIN_FILENO], 1); 616 } 617 618 static ssize_t 619 filter_error(unsigned char *ubuf, ssize_t n) 620 { 621 char *p; 622 char *buf; 623 624 ubuf[n] = '\0'; 625 buf = (char *)ubuf; 626 while (isspace((unsigned char)*buf)) 627 buf++; 628 DPRINTF("Filter error[[[%s]]]\n", buf); 629 if ((p = strchr((char *)buf, '\n')) != NULL) 630 *p = '\0'; 631 if ((p = strchr((char *)buf, ';')) != NULL) 632 *p = '\0'; 633 if ((p = strrchr((char *)buf, ':')) != NULL) { 634 ++p; 635 while (isspace((unsigned char)*p)) 636 p++; 637 n = strlen(p); 638 memmove(ubuf, p, CAST(size_t, n + 1)); 639 } 640 DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf); 641 if (islower(*ubuf)) 642 *ubuf = toupper(*ubuf); 643 return n; 644 } 645 646 private const char * 647 methodname(size_t method) 648 { 649 #ifdef BUILTIN_DECOMPRESS 650 /* FIXME: This doesn't cope with bzip2 */ 651 if (method == 2 || compr[method].maglen == 0) 652 return "zlib"; 653 #endif 654 return compr[method].argv[0]; 655 } 656 657 private int 658 uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old, 659 unsigned char **newch, size_t* n) 660 { 661 int fdp[3][2]; 662 int status, rv; 663 size_t i; 664 ssize_t r; 665 666 #ifdef BUILTIN_DECOMPRESS 667 /* FIXME: This doesn't cope with bzip2 */ 668 if (method == 2) 669 return uncompressgzipped(old, newch, bytes_max, n); 670 if (compr[method].maglen == 0) 671 return uncompresszlib(old, newch, bytes_max, n, 1); 672 #endif 673 (void)fflush(stdout); 674 (void)fflush(stderr); 675 676 for (i = 0; i < __arraycount(fdp); i++) 677 fdp[i][0] = fdp[i][1] = -1; 678 679 if ((fd == -1 && pipe(fdp[STDIN_FILENO]) == -1) || 680 pipe(fdp[STDOUT_FILENO]) == -1 || pipe(fdp[STDERR_FILENO]) == -1) { 681 closep(fdp[STDIN_FILENO]); 682 closep(fdp[STDOUT_FILENO]); 683 return makeerror(newch, n, "Cannot create pipe, %s", 684 strerror(errno)); 685 } 686 switch (fork()) { 687 case 0: /* child */ 688 if (fd != -1) { 689 fdp[STDIN_FILENO][0] = fd; 690 (void) lseek(fd, (off_t)0, SEEK_SET); 691 } 692 693 for (i = 0; i < __arraycount(fdp); i++) 694 copydesc(CAST(int, i), fdp[i]); 695 696 (void)execvp(compr[method].argv[0], 697 (char *const *)(intptr_t)compr[method].argv); 698 dprintf(STDERR_FILENO, "exec `%s' failed, %s", 699 compr[method].argv[0], strerror(errno)); 700 exit(1); 701 /*NOTREACHED*/ 702 case -1: 703 return makeerror(newch, n, "Cannot fork, %s", 704 strerror(errno)); 705 706 default: /* parent */ 707 for (i = 1; i < __arraycount(fdp); i++) 708 closefd(fdp[i], 1); 709 710 /* Write the buffer data to the child, if we don't have fd */ 711 if (fd == -1) 712 writechild(fdp, old, *n); 713 714 *newch = CAST(unsigned char *, malloc(bytes_max + 1)); 715 if (*newch == NULL) { 716 rv = makeerror(newch, n, "No buffer, %s", 717 strerror(errno)); 718 goto err; 719 } 720 rv = OKDATA; 721 if ((r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0)) > 0) 722 break; 723 DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0], 724 r != -1 ? strerror(errno) : "no data"); 725 726 rv = ERRDATA; 727 if (r == 0 && 728 (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0) 729 { 730 r = filter_error(*newch, r); 731 break; 732 } 733 free(*newch); 734 if (r == 0) 735 rv = makeerror(newch, n, "Read failed, %s", 736 strerror(errno)); 737 else 738 rv = makeerror(newch, n, "No data"); 739 goto err; 740 } 741 742 *n = r; 743 /* NUL terminate, as every buffer is handled here. */ 744 (*newch)[*n] = '\0'; 745 err: 746 closefd(fdp[STDIN_FILENO], 1); 747 closefd(fdp[STDOUT_FILENO], 0); 748 closefd(fdp[STDERR_FILENO], 0); 749 if (wait(&status) == -1) { 750 free(*newch); 751 rv = makeerror(newch, n, "Wait failed, %s", strerror(errno)); 752 DPRINTF("Child wait return %#x\n", status); 753 } else if (!WIFEXITED(status)) { 754 DPRINTF("Child not exited (%#x)\n", status); 755 } else if (WEXITSTATUS(status) != 0) { 756 DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status)); 757 } 758 759 closefd(fdp[STDIN_FILENO], 0); 760 DPRINTF("Returning %p n=%zu rv=%d\n", *newch, *n, rv); 761 762 return rv; 763 } 764 #endif 765