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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
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
38 FILE_RCSID("@(#)$File: compress.c,v 1.136 2022/09/13 16:08:34 christos Exp $")
55 typedef void (*sig_t)(int);
56 #endif /* HAVE_SIG_T */
57 #ifdef HAVE_SYS_IOCTL_H
58 #include <sys/ioctl.h>
60 #ifdef HAVE_SYS_WAIT_H
63 #if defined(HAVE_SYS_TIME_H)
67 #if defined(HAVE_ZLIB_H) && defined(ZLIBSUPPORT)
68 #define BUILTIN_DECOMPRESS
72 #if defined(HAVE_BZLIB_H) && defined(BZLIBSUPPORT)
77 #if defined(HAVE_LZMA_H) && defined(XZLIBSUPPORT)
84 #define DPRINTF(...) do { \
86 tty = open("/dev/tty", O_RDWR); \
89 dprintf(tty, __VA_ARGS__); \
90 } while (/*CONSTCOND*/0)
97 * The following python code is not really used because ZLIBSUPPORT is only
98 * defined if we have a built-in zlib, and the built-in zlib handles that.
99 * That is not true for android where we have zlib.h and not -lz.
101 static const char zlibcode[] =
102 "import sys, zlib; sys.stdout.write(zlib.decompress(sys.stdin.read()))";
104 static const char *zlib_args[] = { "python", "-c", zlibcode, NULL };
107 zlibcmp(const unsigned char *buf)
109 unsigned short x = 1;
110 unsigned char *s = CAST(unsigned char *, CAST(void *, &x));
112 if ((buf[0] & 0xf) != 8 || (buf[0] & 0x80) != 0)
114 if (s[0] != 1) /* endianness test */
115 x = buf[0] | (buf[1] << 8);
117 x = buf[1] | (buf[0] << 8);
125 lzmacmp(const unsigned char *buf)
127 if (buf[0] != 0x5d || buf[1] || buf[2])
129 if (buf[12] && buf[12] != 0xff)
134 #define gzip_flags "-cd"
135 #define lrzip_flags "-do"
136 #define lzip_flags gzip_flags
138 static const char *gzip_args[] = {
139 "gzip", gzip_flags, NULL
141 static const char *uncompress_args[] = {
142 "uncompress", "-c", NULL
144 static const char *bzip2_args[] = {
147 static const char *lzip_args[] = {
148 "lzip", lzip_flags, NULL
150 static const char *xz_args[] = {
153 static const char *lrzip_args[] = {
154 "lrzip", lrzip_flags, NULL
156 static const char *lz4_args[] = {
159 static const char *zstd_args[] = {
164 #define do_bzlib NULL
166 private const struct {
169 int (*func)(const unsigned char *);
175 #define METH_FROZEN 2
180 { { .magic = "\037\235" }, 2, gzip_args, NULL }, /* 0, compressed */
181 /* Uncompress can get stuck; so use gzip first if we have it
182 * Idea from Damien Clark, thanks! */
183 { { .magic = "\037\235" }, 2, uncompress_args, NULL },/* 1, compressed */
184 { { .magic = "\037\213" }, 2, gzip_args, do_zlib },/* 2, gzipped */
185 { { .magic = "\037\236" }, 2, gzip_args, NULL }, /* 3, frozen */
186 { { .magic = "\037\240" }, 2, gzip_args, NULL }, /* 4, SCO LZH */
187 /* the standard pack utilities do not accept standard input */
188 { { .magic = "\037\036" }, 2, gzip_args, NULL }, /* 5, packed */
189 { { .magic = "PK\3\4" }, 4, gzip_args, NULL }, /* 6, pkziped */
190 /* ...only first file examined */
191 { { .magic = "BZh" }, 3, bzip2_args, do_bzlib },/* 7, bzip2-ed */
192 { { .magic = "LZIP" }, 4, lzip_args, NULL }, /* 8, lzip-ed */
193 { { .magic = "\3757zXZ\0" },6, xz_args, NULL }, /* 9, XZ Util */
194 { { .magic = "LRZI" }, 4, lrzip_args, NULL }, /* 10, LRZIP */
195 { { .magic = "\004\"M\030" },4, lz4_args, NULL }, /* 11, LZ4 */
196 { { .magic = "\x28\xB5\x2F\xFD" }, 4, zstd_args, NULL },/* 12, zstd */
197 { { .func = lzmacmp }, -13, xz_args, NULL }, /* 13, lzma */
199 { { .func = zlibcmp }, -2, zlib_args, NULL }, /* 14, zlib */
207 private ssize_t swrite(int, const void *, size_t);
209 private size_t ncompr = __arraycount(compr);
210 private int uncompressbuf(int, size_t, size_t, const unsigned char *,
211 unsigned char **, size_t *);
212 #ifdef BUILTIN_DECOMPRESS
213 private int uncompresszlib(const unsigned char *, unsigned char **, size_t,
215 private int uncompressgzipped(const unsigned char *, unsigned char **, size_t,
219 private int uncompressbzlib(const unsigned char *, unsigned char **, size_t,
223 private int uncompressxzlib(const unsigned char *, unsigned char **, size_t,
227 static int makeerror(unsigned char **, size_t *, const char *, ...)
228 __attribute__((__format__(__printf__, 3, 4)));
229 private const char *methodname(size_t);
232 format_decompression_error(struct magic_set *ms, size_t i, unsigned char *buf)
235 int mime = ms->flags & MAGIC_MIME;
238 return file_printf(ms, "ERROR:[%s: %s]", methodname(i), buf);
240 for (p = buf; *p; p++)
244 return file_printf(ms, "application/x-decompression-error-%s-%s",
249 file_zmagic(struct magic_set *ms, const struct buffer *b, const char *name)
251 unsigned char *newbuf = NULL;
255 int urv, prv, rv = 0;
256 int mime = ms->flags & MAGIC_MIME;
258 const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
259 size_t nbytes = b->flen;
261 struct sigaction sig_act;
263 if ((ms->flags & MAGIC_COMPRESS) == 0)
266 for (i = 0; i < ncompr; i++) {
268 if (nbytes < CAST(size_t, abs(compr[i].maglen)))
270 if (compr[i].maglen < 0) {
271 zm = (*compr[i].u.func)(buf);
273 zm = memcmp(buf, compr[i].u.magic,
274 CAST(size_t, compr[i].maglen)) == 0;
280 /* Prevent SIGPIPE death if child dies unexpectedly */
282 //We can use sig_act for both new and old, but
283 struct sigaction new_act;
284 memset(&new_act, 0, sizeof(new_act));
285 new_act.sa_handler = SIG_IGN;
286 sa_saved = sigaction(SIGPIPE, &new_act, &sig_act) != -1;
290 urv = uncompressbuf(fd, ms->bytes_max, i, buf, &newbuf, &nsz);
291 DPRINTF("uncompressbuf = %d, %s, %" SIZE_T_FORMAT "u\n", urv,
292 (char *)newbuf, nsz);
296 ms->flags &= ~MAGIC_COMPRESS;
298 prv = format_decompression_error(ms, i, newbuf);
300 prv = file_buffer(ms, -1, NULL, name, newbuf, nsz);
304 if ((ms->flags & MAGIC_COMPRESS_TRANSP) != 0)
306 if (mime != MAGIC_MIME && mime != 0)
309 mime ? " compressed-encoding=" : " (")) == -1)
311 if ((pb = file_push_buffer(ms)) == NULL)
314 * XXX: If file_buffer fails here, we overwrite
315 * the compressed text. FIXME.
317 if (file_buffer(ms, -1, NULL, NULL, buf, nbytes) == -1) {
318 if (file_pop_buffer(ms, pb) != NULL)
322 if ((rbuf = file_pop_buffer(ms, pb)) != NULL) {
323 if (file_printf(ms, "%s", rbuf) == -1) {
329 if (!mime && file_printf(ms, ")") == -1)
343 DPRINTF("rv = %d\n", rv);
345 if (sa_saved && sig_act.sa_handler != SIG_IGN)
346 (void)sigaction(SIGPIPE, &sig_act, NULL);
349 ms->flags |= MAGIC_COMPRESS;
350 DPRINTF("Zmagic returns %d\n", rv);
355 * `safe' write for sockets and pipes.
358 swrite(int fd, const void *buf, size_t n)
364 switch (rv = write(fd, buf, n)) {
371 buf = CAST(const char *, buf) + rv;
380 * `safe' read for sockets and pipes.
383 sread(int fd, void *buf, size_t n, int canbepipe __attribute__((__unused__)))
391 if (fd == STDIN_FILENO)
395 if (canbepipe && (ioctl(fd, FIONREAD, &t) == -1 || t == 0)) {
398 for (cnt = 0;; cnt++) {
400 struct timeval tout = {0, 100 * 1000};
407 * Avoid soft deadlock: do not read if there
408 * is nothing to read from sockets and pipes.
410 selrv = select(fd + 1, &check, NULL, NULL, &tout);
412 if (errno == EINTR || errno == EAGAIN)
414 } else if (selrv == 0 && cnt >= 5) {
420 (void)ioctl(fd, FIONREAD, &t);
423 if (t > 0 && CAST(size_t, t) < n) {
431 switch ((rv = read(fd, buf, n))) {
440 buf = CAST(char *, CCAST(void *, buf)) + rv;
448 file_pipe2file(struct magic_set *ms, int fd, const void *startbuf,
458 if ((t = getenv("TEMP")) != NULL)
459 (void)strlcpy(buf, t, sizeof(buf));
460 else if ((t = getenv("TMP")) != NULL)
461 (void)strlcpy(buf, t, sizeof(buf));
462 else if ((t = getenv("TMPDIR")) != NULL)
463 (void)strlcpy(buf, t, sizeof(buf));
465 (void)strlcat(buf, "/", sizeof(buf));
466 (void)strlcat(buf, "file.XXXXXX", sizeof(buf));
468 (void)strlcpy(buf, "/tmp/file.XXXXXX", sizeof(buf));
472 char *ptr = mktemp(buf);
473 tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600);
481 mode_t ou = umask(0);
490 file_error(ms, errno,
491 "cannot create temporary file for pipe copy");
495 if (swrite(tfd, startbuf, nbytes) != CAST(ssize_t, nbytes))
498 while ((r = sread(fd, buf, sizeof(buf), 1)) > 0)
499 if (swrite(tfd, buf, CAST(size_t, r)) != r)
505 file_error(ms, errno, "error copying from pipe to temp file");
510 file_error(ms, errno, "error while writing to temp file");
515 * We duplicate the file descriptor, because fclose on a
516 * tmpfile will delete the file, but any open descriptors
517 * can still access the phantom inode.
519 if ((fd = dup2(tfd, fd)) == -1) {
520 file_error(ms, errno, "could not dup descriptor for temp file");
524 if (lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) {
531 #ifdef BUILTIN_DECOMPRESS
533 #define FHCRC (1 << 1)
534 #define FEXTRA (1 << 2)
535 #define FNAME (1 << 3)
536 #define FCOMMENT (1 << 4)
540 uncompressgzipped(const unsigned char *old, unsigned char **newch,
541 size_t bytes_max, size_t *n)
543 unsigned char flg = old[3];
544 size_t data_start = 10;
547 if (data_start + 1 >= *n)
549 data_start += 2 + old[data_start] + old[data_start + 1] * 256;
552 while(data_start < *n && old[data_start])
556 if (flg & FCOMMENT) {
557 while(data_start < *n && old[data_start])
564 if (data_start >= *n)
569 return uncompresszlib(old, newch, bytes_max, n, 0);
571 return makeerror(newch, n, "File too short");
575 uncompresszlib(const unsigned char *old, unsigned char **newch,
576 size_t bytes_max, size_t *n, int zlib)
581 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL)
582 return makeerror(newch, n, "No buffer, %s", strerror(errno));
584 z.next_in = CCAST(Bytef *, old);
585 z.avail_in = CAST(uint32_t, *n);
587 z.avail_out = CAST(unsigned int, bytes_max);
592 /* LINTED bug in header macro */
593 rc = zlib ? inflateInit(&z) : inflateInit2(&z, -15);
597 rc = inflate(&z, Z_SYNC_FLUSH);
598 if (rc != Z_OK && rc != Z_STREAM_END)
601 *n = CAST(size_t, z.total_out);
606 /* let's keep the nul-terminate tradition */
611 strlcpy(RCAST(char *, *newch), z.msg ? z.msg : zError(rc), bytes_max);
612 *n = strlen(RCAST(char *, *newch));
619 uncompressbzlib(const unsigned char *old, unsigned char **newch,
620 size_t bytes_max, size_t *n)
625 memset(&bz, 0, sizeof(bz));
626 rc = BZ2_bzDecompressInit(&bz, 0, 0);
630 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL)
631 return makeerror(newch, n, "No buffer, %s", strerror(errno));
633 bz.next_in = CCAST(char *, RCAST(const char *, old));
634 bz.avail_in = CAST(uint32_t, *n);
635 bz.next_out = RCAST(char *, *newch);
636 bz.avail_out = CAST(unsigned int, bytes_max);
638 rc = BZ2_bzDecompress(&bz);
639 if (rc != BZ_OK && rc != BZ_STREAM_END)
642 /* Assume byte_max is within 32bit */
643 /* assert(bz.total_out_hi32 == 0); */
644 *n = CAST(size_t, bz.total_out_lo32);
645 rc = BZ2_bzDecompressEnd(&bz);
649 /* let's keep the nul-terminate tradition */
654 snprintf(RCAST(char *, *newch), bytes_max, "bunzip error %d", rc);
655 *n = strlen(RCAST(char *, *newch));
662 uncompressxzlib(const unsigned char *old, unsigned char **newch,
663 size_t bytes_max, size_t *n)
668 memset(&xz, 0, sizeof(xz));
669 rc = lzma_auto_decoder(&xz, UINT64_MAX, 0);
673 if ((*newch = CAST(unsigned char *, malloc(bytes_max + 1))) == NULL)
674 return makeerror(newch, n, "No buffer, %s", strerror(errno));
676 xz.next_in = CCAST(const uint8_t *, old);
677 xz.avail_in = CAST(uint32_t, *n);
678 xz.next_out = RCAST(uint8_t *, *newch);
679 xz.avail_out = CAST(unsigned int, bytes_max);
681 rc = lzma_code(&xz, LZMA_RUN);
682 if (rc != LZMA_OK && rc != LZMA_STREAM_END)
685 *n = CAST(size_t, xz.total_out);
689 /* let's keep the nul-terminate tradition */
694 snprintf(RCAST(char *, *newch), bytes_max, "unxz error %d", rc);
695 *n = strlen(RCAST(char *, *newch));
702 makeerror(unsigned char **buf, size_t *len, const char *fmt, ...)
709 rv = vasprintf(&msg, fmt, ap);
716 *buf = RCAST(unsigned char *, msg);
722 closefd(int *fd, size_t i)
734 for (i = 0; i < 2; i++)
739 movedesc(void *v, int i, int fd)
742 return; /* "no dup was necessary" */
743 #ifdef HAVE_POSIX_SPAWNP
744 posix_spawn_file_actions_t *fa = RCAST(posix_spawn_file_actions_t *, v);
745 posix_spawn_file_actions_adddup2(fa, fd, i);
746 posix_spawn_file_actions_addclose(fa, fd);
748 if (dup2(fd, i) == -1) {
749 DPRINTF("dup(%d, %d) failed (%s)\n", fd, i, strerror(errno));
757 closedesc(void *v, int fd)
759 #ifdef HAVE_POSIX_SPAWNP
760 posix_spawn_file_actions_t *fa = RCAST(posix_spawn_file_actions_t *, v);
761 posix_spawn_file_actions_addclose(fa, fd);
768 handledesc(void *v, int fd, int fdp[3][2])
771 (void) lseek(fd, CAST(off_t, 0), SEEK_SET);
772 movedesc(v, STDIN_FILENO, fd);
774 movedesc(v, STDIN_FILENO, fdp[STDIN_FILENO][0]);
775 if (fdp[STDIN_FILENO][1] > 2)
776 closedesc(v, fdp[STDIN_FILENO][1]);
779 file_clear_closexec(STDIN_FILENO);
781 ///FIXME: if one of the fdp[i][j] is 0 or 1, this can bomb spectacularly
782 movedesc(v, STDOUT_FILENO, fdp[STDOUT_FILENO][1]);
783 if (fdp[STDOUT_FILENO][0] > 2)
784 closedesc(v, fdp[STDOUT_FILENO][0]);
786 file_clear_closexec(STDOUT_FILENO);
788 movedesc(v, STDERR_FILENO, fdp[STDERR_FILENO][1]);
789 if (fdp[STDERR_FILENO][0] > 2)
790 closedesc(v, fdp[STDERR_FILENO][0]);
792 file_clear_closexec(STDERR_FILENO);
796 writechild(int fd, const void *old, size_t n)
801 * fork again, to avoid blocking because both
806 DPRINTF("Fork failed (%s)\n", strerror(errno));
811 if (swrite(fd, old, n) != CAST(ssize_t, n)) {
812 DPRINTF("Write failed (%s)\n", strerror(errno));
822 filter_error(unsigned char *ubuf, ssize_t n)
828 buf = RCAST(char *, ubuf);
829 while (isspace(CAST(unsigned char, *buf)))
831 DPRINTF("Filter error[[[%s]]]\n", buf);
832 if ((p = strchr(CAST(char *, buf), '\n')) != NULL)
834 if ((p = strchr(CAST(char *, buf), ';')) != NULL)
836 if ((p = strrchr(CAST(char *, buf), ':')) != NULL) {
838 while (isspace(CAST(unsigned char, *p)))
841 memmove(ubuf, p, CAST(size_t, n + 1));
843 DPRINTF("Filter error after[[[%s]]]\n", (char *)ubuf);
845 *ubuf = toupper(*ubuf);
850 methodname(size_t method)
853 #ifdef BUILTIN_DECOMPRESS
868 return compr[method].argv[0];
873 uncompressbuf(int fd, size_t bytes_max, size_t method, const unsigned char *old,
874 unsigned char **newch, size_t* n)
883 #ifdef HAVE_POSIX_SPAWNP
884 posix_spawn_file_actions_t fa;
888 #ifdef BUILTIN_DECOMPRESS
890 return uncompressgzipped(old, newch, bytes_max, n);
892 return uncompresszlib(old, newch, bytes_max, n, 1);
896 return uncompressbzlib(old, newch, bytes_max, n);
901 return uncompressxzlib(old, newch, bytes_max, n);
907 (void)fflush(stdout);
908 (void)fflush(stderr);
910 for (i = 0; i < __arraycount(fdp); i++)
911 fdp[i][0] = fdp[i][1] = -1;
914 * There are multithreaded users who run magic_file()
915 * from dozens of threads. If two parallel magic_file() calls
916 * analyze two large compressed files, both will spawn
917 * an uncompressing child here, which writes out uncompressed data.
918 * We read some portion, then close the pipe, then waitpid() the child.
919 * If uncompressed data is larger, child shound get EPIPE and exit.
920 * However, with *parallel* calls OTHER child may unintentionally
921 * inherit pipe fds, thus keeping pipe open and making writes in
922 * our child block instead of failing with EPIPE!
923 * (For the bug to occur, two threads must mutually inherit their pipes,
924 * and both must have large outputs. Thus it happens not that often).
925 * To avoid this, be sure to create pipes with O_CLOEXEC.
927 if ((fd == -1 && file_pipe_closexec(fdp[STDIN_FILENO]) == -1) ||
928 file_pipe_closexec(fdp[STDOUT_FILENO]) == -1 ||
929 file_pipe_closexec(fdp[STDERR_FILENO]) == -1) {
930 closep(fdp[STDIN_FILENO]);
931 closep(fdp[STDOUT_FILENO]);
932 return makeerror(newch, n, "Cannot create pipe, %s",
936 args = RCAST(char *const *, RCAST(intptr_t, compr[method].argv));
937 #ifdef HAVE_POSIX_SPAWNP
938 posix_spawn_file_actions_init(&fa);
940 handledesc(&fa, fd, fdp);
942 status = posix_spawnp(&pid, compr[method].argv[0], &fa, NULL,
945 posix_spawn_file_actions_destroy(&fa);
948 return makeerror(newch, n, "Cannot posix_spawn `%s', %s",
949 compr[method].argv[0], strerror(errno));
952 /* For processes with large mapped virtual sizes, vfork
953 * may be _much_ faster (10-100 times) than fork.
957 return makeerror(newch, n, "Cannot vfork, %s",
962 /* Note: we are after vfork, do not modify memory
963 * in a way which confuses parent. In particular,
964 * do not modify fdp[i][j].
966 handledesc(NULL, fd, fdp);
968 (void)execvp(compr[method].argv[0], args);
969 dprintf(STDERR_FILENO, "exec `%s' failed, %s",
970 compr[method].argv[0], strerror(errno));
971 _exit(1); /* _exit(), not exit(), because of vfork */
975 /* Close write sides of child stdout/err pipes */
976 for (i = 1; i < __arraycount(fdp); i++)
978 /* Write the buffer data to child stdin, if we don't have fd */
980 closefd(fdp[STDIN_FILENO], 0);
981 writepid = writechild(fdp[STDIN_FILENO][1], old, *n);
982 closefd(fdp[STDIN_FILENO], 1);
985 *newch = CAST(unsigned char *, malloc(bytes_max + 1));
986 if (*newch == NULL) {
987 rv = makeerror(newch, n, "No buffer, %s",
993 r = sread(fdp[STDOUT_FILENO][0], *newch, bytes_max, 0);
994 if (r == 0 && errno == 0)
997 DPRINTF("Read stdout failed %d (%s)\n", fdp[STDOUT_FILENO][0],
998 r != -1 ? strerror(errno) : "no data");
1002 (r = sread(fdp[STDERR_FILENO][0], *newch, bytes_max, 0)) > 0)
1004 r = filter_error(*newch, r);
1009 rv = makeerror(newch, n, "Read failed, %s",
1012 rv = makeerror(newch, n, "No data");
1017 /* NUL terminate, as every buffer is handled here. */
1018 (*newch)[*n] = '\0';
1020 closefd(fdp[STDIN_FILENO], 1);
1021 closefd(fdp[STDOUT_FILENO], 0);
1022 closefd(fdp[STDERR_FILENO], 0);
1024 w = waitpid(pid, &status, 0);
1028 rv = makeerror(newch, n, "Wait failed, %s", strerror(errno));
1029 DPRINTF("Child wait return %#x\n", status);
1030 } else if (!WIFEXITED(status)) {
1031 DPRINTF("Child not exited (%#x)\n", status);
1032 } else if (WEXITSTATUS(status) != 0) {
1033 DPRINTF("Child exited (%#x)\n", WEXITSTATUS(status));
1036 /* _After_ we know decompressor has exited, our input writer
1037 * definitely will exit now (at worst, writing fails in it,
1038 * since output fd is closed now on the reading size).
1040 w = waitpid(writepid, &status, 0);
1045 closefd(fdp[STDIN_FILENO], 0); //why? it is already closed here!
1046 DPRINTF("Returning %p n=%" SIZE_T_FORMAT "u rv=%d\n", *newch, *n, rv);