1 /* $NetBSD: compress.c,v 1.15 2018/04/15 19:45:32 christos Exp $ */ 2 3 /* 4 * Copyright (c) Ian F. Darwin 1986-1995. 5 * Software written by Ian F. Darwin and others; 6 * maintained 1995-present by Christos Zoulas and others. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice immediately at the beginning of the file, without modification, 13 * this list of conditions, and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 /* 31 * compress routines: 32 * zmagic() - returns 0 if not recognized, uncompresses and prints 33 * information if recognized 34 * uncompress(method, old, n, newch) - uncompress old into new, 35 * using method, return sizeof new 36 */ 37 #include "file.h" 38 39 #ifndef lint 40 #if 0 41 FILE_RCSID("@(#)$File: compress.c,v 1.106 2017/11/02 20:25:39 christos Exp $") 42 #else 43 __RCSID("$NetBSD: compress.c,v 1.15 2018/04/15 19:45:32 christos Exp $"); 44 #endif 45 #endif 46 47 #include "magic.h" 48 #include <stdlib.h> 49 #ifdef HAVE_UNISTD_H 50 #include <unistd.h> 51 #endif 52 #include <string.h> 53 #include <errno.h> 54 #include <ctype.h> 55 #include <stdarg.h> 56 #ifdef HAVE_SIGNAL_H 57 #include <signal.h> 58 # ifndef HAVE_SIG_T 59 typedef void (*sig_t)(int); 60 # endif /* HAVE_SIG_T */ 61 #endif 62 #if !defined(__MINGW32__) && !defined(WIN32) 63 #include <sys/ioctl.h> 64 #endif 65 #ifdef HAVE_SYS_WAIT_H 66 #include <sys/wait.h> 67 #endif 68 #if defined(HAVE_SYS_TIME_H) 69 #include <sys/time.h> 70 #endif 71 #if defined(HAVE_ZLIB_H) && defined(ZLIBSUPPORT) 72 #define BUILTIN_DECOMPRESS 73 #include <zlib.h> 74 #endif 75 #ifdef DEBUG 76 int tty = -1; 77 #define DPRINTF(...) do { \ 78 if (tty == -1) \ 79 tty = open("/dev/tty", O_RDWR); \ 80 if (tty == -1) \ 81 abort(); \ 82 dprintf(tty, __VA_ARGS__); \ 83 } while (/*CONSTCOND*/0) 84 #else 85 #define DPRINTF(...) 86 #endif 87 88 #ifdef ZLIBSUPPORT 89 /* 90 * The following python code is not really used because ZLIBSUPPORT is only 91 * defined if we have a built-in zlib, and the built-in zlib handles that. 92 * That is not true for android where we have zlib.h and not -lz. 93 */ 94 static const char zlibcode[] = 95 "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))"; 96 97 static const char *zlib_args[] = { "python", "-c", zlibcode, NULL }; 98 99 static int 100 zlibcmp(const unsigned char *buf) 101 { 102 unsigned short x = 1; 103 unsigned char *s = CAST(unsigned char *, CAST(void *, &x)); 104 105 if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0) 106 return 0; 107 if (s[0] != 1) /* endianness test */ 108 x = buf[0] | (buf[1] << 8); 109 else 110 x = buf[1] | (buf[0] << 8); 111 if (x % 31) 112 return 0; 113 return 1; 114 } 115 #endif 116 117 #define gzip_flags "-cd" 118 #define lrzip_flags "-do" 119 #define lzip_flags gzip_flags 120 121 static const char *gzip_args[] = { 122 "gzip", gzip_flags, NULL 123 }; 124 static const char *uncompress_args[] = { 125 "uncompress", "-c", NULL 126 }; 127 static const char *bzip2_args[] = { 128 "bzip2", "-cd", NULL 129 }; 130 static const char *lzip_args[] = { 131 "lzip", lzip_flags, NULL 132 }; 133 static const char *xz_args[] = { 134 "xz", "-cd", NULL 135 }; 136 static const char *lrzip_args[] = { 137 "lrzip", lrzip_flags, NULL 138 }; 139 static const char *lz4_args[] = { 140 "lz4", "-cd", NULL 141 }; 142 static const char *zstd_args[] = { 143 "zstd", "-cd", NULL 144 }; 145 146 private const struct { 147 const void *magic; 148 size_t maglen; 149 const char **argv; 150 } compr[] = { 151 { "\037\235", 2, gzip_args }, /* compressed */ 152 /* Uncompress can get stuck; so use gzip first if we have it 153 * Idea from Damien Clark, thanks! */ 154 { "\037\235", 2, uncompress_args }, /* compressed */ 155 { "\037\213", 2, gzip_args }, /* gzipped */ 156 { "\037\236", 2, gzip_args }, /* frozen */ 157 { "\037\240", 2, gzip_args }, /* SCO LZH */ 158 /* the standard pack utilities do not accept standard input */ 159 { "\037\036", 2, gzip_args }, /* packed */ 160 { "PK\3\4", 4, gzip_args }, /* pkzipped, */ 161 /* ...only first file examined */ 162 { "BZh", 3, bzip2_args }, /* bzip2-ed */ 163 { "LZIP", 4, lzip_args }, /* lzip-ed */ 164 { "\3757zXZ\0", 6, xz_args }, /* XZ Utils */ 165 { "LRZI", 4, lrzip_args }, /* LRZIP */ 166 { "\004\"M\030",4, lz4_args }, /* LZ4 */ 167 { "\x28\xB5\x2F\xFD", 4, zstd_args }, /* zstd */ 168 #ifdef ZLIBSUPPORT 169 { RCAST(const void *, zlibcmp), 0, zlib_args }, /* zlib */ 170 #endif 171 }; 172 173 #define OKDATA 0 174 #define NODATA 1 175 #define ERRDATA 2 176 177 private ssize_t swrite(int, const void *, size_t); 178 #if HAVE_FORK 179 private size_t ncompr = sizeof(compr) / sizeof(compr[0]); 180 private int uncompressbuf(int, size_t, size_t, const unsigned char *, 181 unsigned char **, size_t *); 182 #ifdef BUILTIN_DECOMPRESS 183 private int uncompresszlib(const unsigned char *, unsigned char **, size_t, 184 size_t *, int); 185 private int uncompressgzipped(const unsigned char *, unsigned char **, size_t, 186 size_t *); 187 #endif 188 static int makeerror(unsigned char **, size_t *, const char *, ...) 189 __attribute__((__format__(__printf__, 3, 4))); 190 private const char *methodname(size_t); 191 192 protected int 193 file_zmagic(struct magic_set *ms, const struct buffer *b, const char *name) 194 { 195 unsigned char *newbuf = NULL; 196 size_t i, nsz; 197 char *rbuf; 198 file_pushbuf_t *pb; 199 int urv, prv, rv = 0; 200 int mime = ms->flags & MAGIC_MIME; 201 int fd = b->fd; 202 const unsigned char *buf = b->fbuf; 203 size_t nbytes = b->flen; 204 #ifdef HAVE_SIGNAL_H 205 sig_t osigpipe; 206 #endif 207 208 if ((ms->flags & MAGIC_COMPRESS) == 0) 209 return 0; 210 211 #ifdef HAVE_SIGNAL_H 212 osigpipe = signal(SIGPIPE, SIG_IGN); 213 #endif 214 for (i = 0; i < ncompr; i++) { 215 int zm; 216 if (nbytes < compr[i].maglen) 217 continue; 218 #ifdef ZLIBSUPPORT 219 if (compr[i].maglen == 0) 220 zm = (RCAST(int (*)(const unsigned char *), 221 CCAST(void *, compr[i].magic)))(buf); 222 else 223 #endif 224 zm = memcmp(buf, compr[i].magic, compr[i].maglen) == 0; 225 226 if (!zm) 227 continue; 228 nsz = nbytes; 229 urv = uncompressbuf(fd, ms->bytes_max, i, buf, &newbuf, &nsz); 230 DPRINTF("uncompressbuf = %d, %s, %zu\n", urv, (char *)newbuf, 231 nsz); 232 switch (urv) { 233 case OKDATA: 234 case ERRDATA: 235 236 ms->flags &= ~MAGIC_COMPRESS; 237 if (urv == ERRDATA) 238 prv = file_printf(ms, "%s ERROR: %s", 239 methodname(i), newbuf); 240 else 241 prv = file_buffer(ms, -1, name, newbuf, nsz); 242 if (prv == -1) 243 goto error; 244 rv = 1; 245 if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0) 246 goto out; 247 if (mime != MAGIC_MIME && mime != 0) 248 goto out; 249 if ((file_printf(ms, 250 mime ? " compressed-encoding=" : " (")) == -1) 251 goto error; 252 if ((pb = file_push_buffer(ms)) == NULL) 253 goto error; 254 /* 255 * XXX: If file_buffer fails here, we overwrite 256 * the compressed text. FIXME. 257 */ 258 if (file_buffer(ms, -1, NULL, buf, nbytes) == -1) 259 goto error; 260 if ((rbuf = file_pop_buffer(ms, pb)) != NULL) { 261 if (file_printf(ms, "%s", rbuf) == -1) { 262 free(rbuf); 263 goto error; 264 } 265 free(rbuf); 266 } 267 if (!mime && file_printf(ms, ")") == -1) 268 goto error; 269 /*FALLTHROUGH*/ 270 case NODATA: 271 break; 272 default: 273 abort(); 274 /*NOTREACHED*/ 275 error: 276 rv = -1; 277 break; 278 } 279 } 280 out: 281 DPRINTF("rv = %d\n", rv); 282 283 #ifdef HAVE_SIGNAL_H 284 (void)signal(SIGPIPE, osigpipe); 285 #endif 286 free(newbuf); 287 ms->flags |= MAGIC_COMPRESS; 288 DPRINTF("Zmagic returns %d\n", rv); 289 return rv; 290 } 291 #endif 292 /* 293 * `safe' write for sockets and pipes. 294 */ 295 private ssize_t 296 swrite(int fd, const void *buf, size_t n) 297 { 298 ssize_t rv; 299 size_t rn = n; 300 301 do 302 switch (rv = write(fd, buf, n)) { 303 case -1: 304 if (errno == EINTR) 305 continue; 306 return -1; 307 default: 308 n -= rv; 309 buf = CAST(const char *, buf) + rv; 310 break; 311 } 312 while (n > 0); 313 return rn; 314 } 315 316 317 /* 318 * `safe' read for sockets and pipes. 319 */ 320 protected ssize_t 321 sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__))) 322 { 323 ssize_t rv; 324 #ifdef FIONREAD 325 int t = 0; 326 #endif 327 size_t rn = n; 328 329 if (fd == STDIN_FILENO) 330 goto nocheck; 331 332 #ifdef FIONREAD 333 if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) { 334 #ifdef FD_ZERO 335 ssize_t cnt; 336 for (cnt = 0;; cnt++) { 337 fd_set check; 338 struct timeval tout = {0, 100 * 1000}; 339 int selrv; 340 341 FD_ZERO(&check); 342 FD_SET(fd, &check); 343 344 /* 345 * Avoid soft deadlock: do not read if there 346 * is nothing to read from sockets and pipes. 347 */ 348 selrv = select(fd + 1, &check, NULL, NULL, &tout); 349 if (selrv == -1) { 350 if (errno == EINTR || errno == EAGAIN) 351 continue; 352 } else if (selrv == 0 && cnt >= 5) { 353 return 0; 354 } else 355 break; 356 } 357 #endif 358 (void)ioctl(fd, FIONREAD, &t); 359 } 360 361 if (t > 0 && (size_t)t < n) { 362 n = t; 363 rn = n; 364 } 365 #endif 366 367 nocheck: 368 do 369 switch ((rv = read(fd, buf, n))) { 370 case -1: 371 if (errno == EINTR) 372 continue; 373 return -1; 374 case 0: 375 return rn - n; 376 default: 377 n -= rv; 378 buf = CAST(char *, CCAST(void *, buf)) + rv; 379 break; 380 } 381 while (n > 0); 382 return rn; 383 } 384 385 protected int 386 file_pipe2file(struct magic_set *ms, int fd, const void *startbuf, 387 size_t nbytes) 388 { 389 char buf[4096]; 390 ssize_t r; 391 int tfd; 392 393 (void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof buf); 394 #ifndef HAVE_MKSTEMP 395 { 396 char *ptr = mktemp(buf); 397 tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600); 398 r = errno; 399 (void)unlink(ptr); 400 errno = r; 401 } 402 #else 403 { 404 int te; 405 tfd = mkstemp(buf); 406 te = errno; 407 (void)unlink(buf); 408 errno = te; 409 } 410 #endif 411 if (tfd == -1) { 412 file_error(ms, errno, 413 "cannot create temporary file for pipe copy"); 414 return -1; 415 } 416 417 if (swrite(tfd, startbuf, nbytes) != (ssize_t)nbytes) 418 r = 1; 419 else { 420 while ((r = sread(fd, buf, sizeof(buf), 1)) > 0) 421 if (swrite(tfd, buf, (size_t)r) != r) 422 break; 423 } 424 425 switch (r) { 426 case -1: 427 file_error(ms, errno, "error copying from pipe to temp file"); 428 return -1; 429 case 0: 430 break; 431 default: 432 file_error(ms, errno, "error while writing to temp file"); 433 return -1; 434 } 435 436 /* 437 * We duplicate the file descriptor, because fclose on a 438 * tmpfile will delete the file, but any open descriptors 439 * can still access the phantom inode. 440 */ 441 if ((fd = dup2(tfd, fd)) == -1) { 442 file_error(ms, errno, "could not dup descriptor for temp file"); 443 return -1; 444 } 445 (void)close(tfd); 446 if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) { 447 file_badseek(ms); 448 return -1; 449 } 450 return fd; 451 } 452 #if HAVE_FORK 453 #ifdef BUILTIN_DECOMPRESS 454 455 #define FHCRC (1 << 1) 456 #define FEXTRA (1 << 2) 457 #define FNAME (1 << 3) 458 #define FCOMMENT (1 << 4) 459 460 461 private int 462 uncompressgzipped(const unsigned char *old, unsigned char **newch, 463 size_t bytes_max, size_t *n) 464 { 465 unsigned char flg = old[3]; 466 size_t data_start = 10; 467 468 if (flg & FEXTRA) { 469 if (data_start + 1 >= *n) 470 goto err; 471 data_start += 2 + old[data_start] + old[data_start + 1] * 256; 472 } 473 if (flg & FNAME) { 474 while(data_start < *n && old[data_start]) 475 data_start++; 476 data_start++; 477 } 478 if (flg & FCOMMENT) { 479 while(data_start < *n && old[data_start]) 480 data_start++; 481 data_start++; 482 } 483 if (flg & FHCRC) 484 data_start += 2; 485 486 if (data_start >= *n) 487 goto err; 488 489 *n -= data_start; 490 old += data_start; 491 return uncompresszlib(old, newch, bytes_max, n, 0); 492 err: 493 return makeerror(newch, n, "File too short"); 494 } 495 496 private int 497 uncompresszlib(const unsigned char *old, unsigned char **newch, 498 size_t bytes_max, size_t *n, int zlib) 499 { 500 int rc; 501 z_stream z; 502 503 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL) 504 return makeerror(newch, n, "No buffer, %s", strerror(errno)); 505 506 z.next_in = CCAST(Bytef *, old); 507 z.avail_in = CAST(uint32_t, *n); 508 z.next_out = *newch; 509 z.avail_out = CAST(unsigned int, bytes_max); 510 z.zalloc = Z_NULL; 511 z.zfree = Z_NULL; 512 z.opaque = Z_NULL; 513 514 /* LINTED bug in header macro */ 515 rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15); 516 if (rc != Z_OK) 517 goto err; 518 519 rc = inflate(&z, Z_SYNC_FLUSH); 520 if (rc != Z_OK && rc != Z_STREAM_END) 521 goto err; 522 523 *n = (size_t)z.total_out; 524 rc = inflateEnd(&z); 525 if (rc != Z_OK) 526 goto err; 527 528 /* let's keep the nul-terminate tradition */ 529 (*newch)[*n] = '\0'; 530 531 return OKDATA; 532 err: 533 strlcpy((char *)*newch, z.msg ? z.msg : zError(rc), bytes_max); 534 *n = strlen((char *)*newch); 535 return ERRDATA; 536 } 537 #endif 538 539 static int 540 makeerror(unsigned char **buf, size_t *len, const char *fmt, ...) 541 { 542 char *msg; 543 va_list ap; 544 int rv; 545 546 va_start(ap, fmt); 547 rv = vasprintf(&msg, fmt, ap); 548 va_end(ap); 549 if (rv < 0) { 550 *buf = NULL; 551 *len = 0; 552 return NODATA; 553 } 554 *buf = (unsigned char *)msg; 555 *len = strlen(msg); 556 return ERRDATA; 557 } 558 559 static void 560 closefd(int *fd, size_t i) 561 { 562 if (fd[i] == -1) 563 return; 564 (void) close(fd[i]); 565 fd[i] = -1; 566 } 567 568 static void 569 closep(int *fd) 570 { 571 size_t i; 572 for (i = 0; i < 2; i++) 573 closefd(fd, i); 574 } 575 576 static void 577 copydesc(int i, int *fd) 578 { 579 int j = fd[i == STDIN_FILENO ? 0 : 1]; 580 if (j == i) 581 return; 582 if (dup2(j, i) == -1) { 583 DPRINTF("dup(%d, %d) failed (%s)\n", j, i, strerror(errno)); 584 exit(1); 585 } 586 closep(fd); 587 } 588 589 static void 590 writechild(int fdp[3][2], const void *old, size_t n) 591 { 592 int status; 593 594 closefd(fdp[STDIN_FILENO], 0); 595 /* 596 * fork again, to avoid blocking because both 597 * pipes filled 598 */ 599 switch (fork()) { 600 case 0: /* child */ 601 closefd(fdp[STDOUT_FILENO], 0); 602 if (swrite(fdp[STDIN_FILENO][1], old, n) != (ssize_t)n) { 603 DPRINTF("Write failed (%s)\n", strerror(errno)); 604 exit(1); 605 } 606 exit(0); 607 /*NOTREACHED*/ 608 609 case -1: 610 DPRINTF("Fork failed (%s)\n", strerror(errno)); 611 exit(1); 612 /*NOTREACHED*/ 613 614 default: /* parent */ 615 if (wait(&status) == -1) { 616 DPRINTF("Wait failed (%s)\n", strerror(errno)); 617 exit(1); 618 } 619 DPRINTF("Grandchild wait return %#x\n", status); 620 } 621 closefd(fdp[STDIN_FILENO], 1); 622 } 623 624 static ssize_t 625 filter_error(unsigned char *ubuf, ssize_t n) 626 { 627 char *p; 628 char *buf; 629 630 ubuf[n] = '\0'; 631 buf = (char *)ubuf; 632 while (isspace((unsigned char)*buf)) 633 buf++; 634 DPRINTF("Filter error[[[%s]]]\n", buf); 635 if ((p = strchr((char *)buf, '\n')) != NULL) 636 *p = '\0'; 637 if ((p = strchr((char *)buf, ';')) != NULL) 638 *p = '\0'; 639 if ((p = strrchr((char *)buf, ':')) != NULL) { 640 ++p; 641 while (isspace((unsigned char)*p)) 642 p++; 643 n = strlen(p); 644 memmove(ubuf, p, CAST(size_t, n + 1)); 645 } 646 DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf); 647 if (islower(*ubuf)) 648 *ubuf = toupper(*ubuf); 649 return n; 650 } 651 652 private const char * 653 methodname(size_t method) 654 { 655 #ifdef BUILTIN_DECOMPRESS 656 /* FIXME: This doesn't cope with bzip2 */ 657 if (method == 2 || compr[method].maglen == 0) 658 return "zlib"; 659 #endif 660 return compr[method].argv[0]; 661 } 662 663 private int 664 uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old, 665 unsigned char **newch, size_t* n) 666 { 667 int fdp[3][2]; 668 int status, rv; 669 size_t i; 670 ssize_t r; 671 672 #ifdef BUILTIN_DECOMPRESS 673 /* FIXME: This doesn't cope with bzip2 */ 674 if (method == 2) 675 return uncompressgzipped(old, newch, bytes_max, n); 676 if (compr[method].maglen == 0) 677 return uncompresszlib(old, newch, bytes_max, n, 1); 678 #endif 679 (void)fflush(stdout); 680 (void)fflush(stderr); 681 682 for (i = 0; i < __arraycount(fdp); i++) 683 fdp[i][0] = fdp[i][1] = -1; 684 685 if ((fd == -1 && pipe(fdp[STDIN_FILENO]) == -1) || 686 pipe(fdp[STDOUT_FILENO]) == -1 || pipe(fdp[STDERR_FILENO]) == -1) { 687 closep(fdp[STDIN_FILENO]); 688 closep(fdp[STDOUT_FILENO]); 689 return makeerror(newch, n, "Cannot create pipe, %s", 690 strerror(errno)); 691 } 692 switch (fork()) { 693 case 0: /* child */ 694 if (fd != -1) { 695 fdp[STDIN_FILENO][0] = fd; 696 (void) lseek(fd, (off_t)0, SEEK_SET); 697 } 698 699 for (i = 0; i < __arraycount(fdp); i++) 700 copydesc(CAST(int, i), fdp[i]); 701 702 (void)execvp(compr[method].argv[0], 703 (char *const *)(intptr_t)compr[method].argv); 704 dprintf(STDERR_FILENO, "exec `%s' failed, %s", 705 compr[method].argv[0], strerror(errno)); 706 exit(1); 707 /*NOTREACHED*/ 708 case -1: 709 return makeerror(newch, n, "Cannot fork, %s", 710 strerror(errno)); 711 712 default: /* parent */ 713 for (i = 1; i < __arraycount(fdp); i++) 714 closefd(fdp[i], 1); 715 716 /* Write the buffer data to the child, if we don't have fd */ 717 if (fd == -1) 718 writechild(fdp, old, *n); 719 720 *newch = CAST(unsigned char *, malloc(bytes_max + 1)); 721 if (*newch == NULL) { 722 rv = makeerror(newch, n, "No buffer, %s", 723 strerror(errno)); 724 goto err; 725 } 726 rv = OKDATA; 727 if ((r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0)) > 0) 728 break; 729 DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0], 730 r != -1 ? strerror(errno) : "no data"); 731 732 rv = ERRDATA; 733 if (r == 0 && 734 (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0) 735 { 736 r = filter_error(*newch, r); 737 break; 738 } 739 free(*newch); 740 if (r == 0) 741 rv = makeerror(newch, n, "Read failed, %s", 742 strerror(errno)); 743 else 744 rv = makeerror(newch, n, "No data"); 745 goto err; 746 } 747 748 *n = r; 749 /* NUL terminate, as every buffer is handled here. */ 750 (*newch)[*n] = '\0'; 751 err: 752 closefd(fdp[STDIN_FILENO], 1); 753 closefd(fdp[STDOUT_FILENO], 0); 754 closefd(fdp[STDERR_FILENO], 0); 755 if (wait(&status) == -1) { 756 free(*newch); 757 rv = makeerror(newch, n, "Wait failed, %s", strerror(errno)); 758 DPRINTF("Child wait return %#x\n", status); 759 } else if (!WIFEXITED(status)) { 760 DPRINTF("Child not exited (%#x)\n", status); 761 } else if (WEXITSTATUS(status) != 0) { 762 DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status)); 763 } 764 765 closefd(fdp[STDIN_FILENO], 0); 766 DPRINTF("Returning %p n=%zu rv=%d\n", *newch, *n, rv); 767 768 return rv; 769 } 770 #endif 771