5428 provide fts(), reallocarray(), and strtonum()

Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Joshua M. Clulow <josh@sysmgr.org>

9 files changed, 1263 insertions, 93 deletions

diff --git a/usr/src/lib/libc/amd64/Makefile b/usr/src/lib/libc/amd64/Makefile
index e77dd63255..8cee9dee02 100644
--- a/usr/src/lib/libc/amd64/Makefile
+++ b/usr/src/lib/libc/amd64/Makefile
@@ -18,14 +18,13 @@
 #
 # CDDL HEADER END
 #
+
 #
 # Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright 2016 Joyent, Inc.
-#
 # Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved.
 # Copyright 2013 Garrett D'Amore <garrett@damore.org>
-# Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
-# Use is subject to license terms.
+# Copyright 2017 Nexenta Systems, Inc.
 #
 
 LIBCBASE=	.
@@ -350,13 +349,13 @@ PORTGEN=			\
 	ascii_strcasecmp.o	\
 	ascii_strncasecmp.o	\
 	assert.o		\
+	atexit.o		\
+	atfork.o		\
 	atof.o			\
 	atoi.o			\
 	atol.o			\
 	atoll.o			\
 	attropen.o		\
-	atexit.o		\
-	atfork.o		\
 	basename.o		\
 	calloc.o		\
 	catgets.o		\
@@ -398,8 +397,10 @@ PORTGEN=			\
 	fmtmsg.o		\
 	ftime.o			\
 	ftok.o			\
+	fts.o			\
 	ftw.o			\
 	gcvt.o			\
+	get_nprocs.o		\
 	getauxv.o		\
 	getcwd.o		\
 	getdate_err.o		\
@@ -417,7 +418,6 @@ PORTGEN=			\
 	getlogin.o		\
 	getmntent.o		\
 	getnetgrent.o		\
-	get_nprocs.o		\
 	getopt.o		\
 	getopt_long.o		\
 	getpagesize.o		\
@@ -498,8 +498,8 @@ PORTGEN=			\
 	posix_madvise.o		\
 	posix_memalign.o	\
 	priocntl.o		\
-	privlib.o		\
 	priv_str_xlate.o	\
+	privlib.o		\
 	psecflags.o		\
 	psiginfo.o		\
 	psignal.o		\
@@ -512,6 +512,7 @@ PORTGEN=			\
 	rctlops.o		\
 	readdir.o		\
 	readdir_r.o		\
+	reallocarray.o		\
 	realpath.o		\
 	reboot.o		\
 	regexpr.o		\
@@ -555,6 +556,7 @@ PORTGEN=			\
 	strtoimax.o		\
 	strtok.o		\
 	strtok_r.o		\
+	strtonum.o		\
 	strtoumax.o		\
 	swab.o			\
 	swapctl.o		\
@@ -1088,24 +1090,24 @@ SRCS=							\
 	$(ATOMICOBJS:%.o=$(SRC)/common/atomic/%.c)	\
 	$(XATTROBJS:%.o=$(SRC)/common/xattr/%.c)	\
 	$(COMOBJS:%.o=$(SRC)/common/util/%.c)		\
-	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)			\
-	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)			\
-	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)		\
-	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)		\
-	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)		\
-	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)		\
-	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)		\
-	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)			\
-	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)			\
-	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)			\
-	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)		\
-	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)		\
-	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)		\
+	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)		\
+	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)		\
+	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)	\
+	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)	\
+	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)	\
+	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)	\
+	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)	\
+	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)		\
+	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)		\
+	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)		\
+	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)	\
+	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)	\
+	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)	\
 	$(THREADSMACHOBJS:%.o=threads/%.c)		\
 	$(UNICODEOBJS:%.o=$(SRC)/common/unicode/%.c)	\
 	$(UNWINDMACHOBJS:%.o=unwind/%.c)		\
 	$(FPOBJS:%.o=fp/%.c)				\
-	$(I386FPOBJS:%.o=$(LIBCDIR)/i386/fp/%.c)		\
+	$(I386FPOBJS:%.o=$(LIBCDIR)/i386/fp/%.c)	\
 	$(LIBCBASE)/gen/ecvt.c				\
 	$(LIBCBASE)/gen/makectxt.c			\
 	$(LIBCBASE)/gen/siginfolst.c			\
diff --git a/usr/src/lib/libc/i386/Makefile.com b/usr/src/lib/libc/i386/Makefile.com
index 4d24e7f176..0a879e1508 100644
--- a/usr/src/lib/libc/i386/Makefile.com
+++ b/usr/src/lib/libc/i386/Makefile.com
@@ -18,14 +18,13 @@
 #
 # CDDL HEADER END
 #
+
 #
 # Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright 2016 Joyent, Inc.
 # Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved.
 # Copyright 2013 Garrett D'Amore <garrett@damore.org>
-#
-# Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
-# Use is subject to license terms.
+# Copyright 2017 Nexenta Systems, Inc.
 #
 
 LIBCDIR=	$(SRC)/lib/libc
@@ -385,14 +384,14 @@ PORTGEN=			\
 	ascii_strcasecmp.o	\
 	ascii_strncasecmp.o	\
 	assert.o		\
+	atexit.o		\
+	atfork.o		\
 	atof.o			\
 	atoi.o			\
 	atol.o			\
 	atoll.o			\
 	attrat.o		\
 	attropen.o		\
-	atexit.o		\
-	atfork.o		\
 	basename.o		\
 	calloc.o		\
 	catgets.o		\
@@ -434,8 +433,10 @@ PORTGEN=			\
 	fmtmsg.o		\
 	ftime.o			\
 	ftok.o			\
+	fts.o			\
 	ftw.o			\
 	gcvt.o			\
+	get_nprocs.o		\
 	getauxv.o		\
 	getcwd.o		\
 	getdate_err.o		\
@@ -453,7 +454,6 @@ PORTGEN=			\
 	getlogin.o		\
 	getmntent.o		\
 	getnetgrent.o		\
-	get_nprocs.o		\
 	getopt.o		\
 	getopt_long.o		\
 	getpagesize.o		\
@@ -534,8 +534,8 @@ PORTGEN=			\
 	posix_madvise.o		\
 	posix_memalign.o	\
 	priocntl.o		\
-	privlib.o		\
 	priv_str_xlate.o	\
+	privlib.o		\
 	psecflags.o		\
 	psiginfo.o		\
 	psignal.o		\
@@ -548,6 +548,7 @@ PORTGEN=			\
 	rctlops.o		\
 	readdir.o		\
 	readdir_r.o		\
+	reallocarray.o		\
 	realpath.o		\
 	reboot.o		\
 	regexpr.o		\
@@ -587,6 +588,7 @@ PORTGEN=			\
 	strtoimax.o		\
 	strtok.o		\
 	strtok_r.o		\
+	strtonum.o		\
 	strtoumax.o		\
 	swab.o			\
 	swapctl.o		\
@@ -1151,23 +1153,23 @@ SRCS=							\
 	$(XATTROBJS:%.o=$(SRC)/common/xattr/%.c)	\
 	$(COMOBJS:%.o=$(SRC)/common/util/%.c)		\
 	$(DTRACEOBJS:%.o=$(SRC)/common/dtrace/%.c)	\
-	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)			\
-	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)			\
-	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)		\
-	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)		\
-	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)		\
-	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)		\
-	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)		\
-	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)			\
-	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)			\
-	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)			\
-	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)		\
-	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)		\
-	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)		\
-	$(THREADSMACHOBJS:%.o=$(LIBCDIR)/$(MACH)/threads/%.c)	\
+	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)		\
+	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)		\
+	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)	\
+	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)	\
+	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)	\
+	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)	\
+	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)	\
+	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)		\
+	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)		\
+	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)		\
+	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)	\
+	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)	\
+	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)	\
+	$(THREADSMACHOBJS:%.o=$(LIBCDIR)/$(MACH)/threads/%.c) \
 	$(UNICODEOBJS:%.o=$(SRC)/common/unicode/%.c)	\
-	$(UNWINDMACHOBJS:%.o=$(LIBCDIR)/port/unwind/%.c)	\
-	$(FPOBJS:%.o=$(LIBCDIR)/$(MACH)/fp/%.c)			\
+	$(UNWINDMACHOBJS:%.o=$(LIBCDIR)/port/unwind/%.c) \
+	$(FPOBJS:%.o=$(LIBCDIR)/$(MACH)/fp/%.c)		\
 	$(LIBCBASE)/gen/ecvt.c				\
 	$(LIBCBASE)/gen/makectxt.c			\
 	$(LIBCBASE)/gen/siginfolst.c			\
diff --git a/usr/src/lib/libc/port/gen/fts.c b/usr/src/lib/libc/port/gen/fts.c
new file mode 100644
index 0000000000..eac375ee6a
--- /dev/null
+++ b/usr/src/lib/libc/port/gen/fts.c
@@ -0,0 +1,1037 @@
+/*
+ * Copyright (c) 1990, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/stat.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define	MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))
+
+#define	ALIGNBYTES	_POINTER_ALIGNMENT
+#define	ALIGN(p)	(((unsigned long)(p) + ALIGNBYTES) & ~ALIGNBYTES)
+
+static FTSENT	*fts_alloc(FTS *, char *, size_t);
+static FTSENT	*fts_build(FTS *, int);
+static void	 fts_lfree(FTSENT *);
+static void	 fts_load(FTS *, FTSENT *);
+static size_t	 fts_maxarglen(char * const *);
+static void	 fts_padjust(FTS *, FTSENT *);
+static int	 fts_palloc(FTS *, size_t);
+static FTSENT	*fts_sort(FTS *, FTSENT *, int);
+static ushort_t	 fts_stat(FTS *, FTSENT *, int, int);
+static int	 fts_safe_changedir(FTS *, FTSENT *, int, char *);
+
+#define	ISDOT(a)	(a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2])))
+
+#define	CLR(opt)	(sp->fts_options &= ~(opt))
+#define	ISSET(opt)	(sp->fts_options & (opt))
+#define	SET(opt)	(sp->fts_options |= (opt))
+
+#define	FCHDIR(sp, fd)	(!ISSET(FTS_NOCHDIR) && fchdir(fd))
+
+/* fts_build flags */
+#define	BCHILD		1		/* fts_children */
+#define	BNAMES		2		/* fts_children, names only */
+#define	BREAD		3		/* fts_read */
+
+FTS *
+fts_open(char * const *argv, int options,
+    int (*compar)(const FTSENT **, const FTSENT **))
+{
+	FTS *sp;
+	FTSENT *p, *root;
+	int nitems;
+	FTSENT *parent, *prev;
+
+	/* Options check. */
+	if (options & ~FTS_OPTIONMASK) {
+		errno = EINVAL;
+		return (NULL);
+	}
+
+	/* At least one path must be specified. */
+	if (*argv == NULL) {
+		errno = EINVAL;
+		return (NULL);
+	}
+
+	/* Allocate/initialize the stream */
+	if ((sp = calloc(1, sizeof (FTS))) == NULL)
+		return (NULL);
+	sp->fts_compar = compar;
+	sp->fts_options = options;
+
+	/* Logical walks turn on NOCHDIR; symbolic links are too hard. */
+	if (ISSET(FTS_LOGICAL))
+		SET(FTS_NOCHDIR);
+
+	/*
+	 * Start out with 1K of path space, and enough, in any case,
+	 * to hold the user's paths.
+	 */
+	if (fts_palloc(sp, MAXIMUM(fts_maxarglen(argv), PATH_MAX)))
+		goto mem1;
+
+	/* Allocate/initialize root's parent. */
+	if ((parent = fts_alloc(sp, "", 0)) == NULL)
+		goto mem2;
+	parent->fts_level = FTS_ROOTPARENTLEVEL;
+
+	/* Allocate/initialize root(s). */
+	for (root = prev = NULL, nitems = 0; *argv; ++argv, ++nitems) {
+		if ((p = fts_alloc(sp, *argv, strlen(*argv))) == NULL)
+			goto mem3;
+		p->fts_level = FTS_ROOTLEVEL;
+		p->fts_parent = parent;
+		p->fts_accpath = p->fts_name;
+		p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW), -1);
+
+		/* Command-line "." and ".." are real directories. */
+		if (p->fts_info == FTS_DOT)
+			p->fts_info = FTS_D;
+
+		/*
+		 * If comparison routine supplied, traverse in sorted
+		 * order; otherwise traverse in the order specified.
+		 */
+		if (compar) {
+			p->fts_link = root;
+			root = p;
+		} else {
+			p->fts_link = NULL;
+			if (root == NULL)
+				root = p;
+			else
+				prev->fts_link = p;
+			prev = p;
+		}
+	}
+	if (compar && nitems > 1)
+		root = fts_sort(sp, root, nitems);
+
+	/*
+	 * Allocate a dummy pointer and make fts_read think that we've just
+	 * finished the node before the root(s); set p->fts_info to FTS_INIT
+	 * so that everything about the "current" node is ignored.
+	 */
+	if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL)
+		goto mem3;
+	sp->fts_cur->fts_link = root;
+	sp->fts_cur->fts_info = FTS_INIT;
+
+	/*
+	 * If using chdir(2), grab a file descriptor pointing to dot to ensure
+	 * that we can get back here; this could be avoided for some paths,
+	 * but almost certainly not worth the effort.  Slashes, symbolic links,
+	 * and ".." are all fairly nasty problems.  Note, if we can't get the
+	 * descriptor we run anyway, just more slowly.
+	 */
+	if (!ISSET(FTS_NOCHDIR) &&
+	    (sp->fts_rfd = open(".", O_RDONLY | O_CLOEXEC)) < 0)
+		SET(FTS_NOCHDIR);
+
+	if (nitems == 0)
+		free(parent);
+
+	return (sp);
+
+mem3:	fts_lfree(root);
+	free(parent);
+mem2:	free(sp->fts_path);
+mem1:	free(sp);
+	return (NULL);
+}
+
+static void
+fts_load(FTS *sp, FTSENT *p)
+{
+	size_t len;
+	char *cp;
+
+	/*
+	 * Load the stream structure for the next traversal.  Since we don't
+	 * actually enter the directory until after the preorder visit, set
+	 * the fts_accpath field specially so the chdir gets done to the right
+	 * place and the user can access the first node.  From fts_open it's
+	 * known that the path will fit.
+	 */
+	len = p->fts_pathlen = p->fts_namelen;
+	(void) memmove(sp->fts_path, p->fts_name, len + 1);
+	if (((cp = strrchr(p->fts_name, '/')) != NULL) &&
+	    (cp != p->fts_name || cp[1])) {
+		len = strlen(++cp);
+		(void) memmove(p->fts_name, cp, len + 1);
+		p->fts_namelen = len;
+	}
+	p->fts_accpath = p->fts_path = sp->fts_path;
+	sp->fts_dev = p->fts_dev;
+}
+
+int
+fts_close(FTS *sp)
+{
+	FTSENT *freep, *p;
+	int rfd, error = 0;
+
+	/*
+	 * This still works if we haven't read anything -- the dummy structure
+	 * points to the root list, so we step through to the end of the root
+	 * list which has a valid parent pointer.
+	 */
+	if (sp->fts_cur) {
+		for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL; ) {
+			freep = p;
+			p = p->fts_link ? p->fts_link : p->fts_parent;
+			free(freep);
+		}
+		free(p);
+	}
+
+	/* Stash the original directory fd if needed. */
+	rfd = ISSET(FTS_NOCHDIR) ? -1 : sp->fts_rfd;
+
+	/* Free up child linked list, sort array, path buffer, stream ptr. */
+	if (sp->fts_child)
+		fts_lfree(sp->fts_child);
+	free(sp->fts_array);
+	free(sp->fts_path);
+	free(sp);
+
+	/* Return to original directory, checking for error. */
+	if (rfd != -1) {
+		int saved_errno;
+		error = fchdir(rfd);
+		saved_errno = errno;
+		(void) close(rfd);
+		errno = saved_errno;
+	}
+
+	return (error);
+}
+
+/*
+ * Special case of "/" at the end of the path so that slashes aren't
+ * appended which would cause paths to be written as "....//foo".
+ */
+#define	NAPPEND(p)							\
+	(p->fts_path[p->fts_pathlen - 1] == '/'				\
+	    ? p->fts_pathlen - 1 : p->fts_pathlen)
+
+FTSENT *
+fts_read(FTS *sp)
+{
+	FTSENT *p, *tmp;
+	int instr;
+	char *t;
+	int saved_errno;
+
+	/* If finished or unrecoverable error, return NULL. */
+	if (sp->fts_cur == NULL || ISSET(FTS_STOP))
+		return (NULL);
+
+	/* Set current node pointer. */
+	p = sp->fts_cur;
+
+	/* Save and zero out user instructions. */
+	instr = p->fts_instr;
+	p->fts_instr = FTS_NOINSTR;
+
+	/* Any type of file may be re-visited; re-stat and re-turn. */
+	if (instr == FTS_AGAIN) {
+		p->fts_info = fts_stat(sp, p, 0, -1);
+		return (p);
+	}
+
+	/*
+	 * Following a symlink -- SLNONE test allows application to see
+	 * SLNONE and recover.  If indirecting through a symlink, have
+	 * keep a pointer to current location.  If unable to get that
+	 * pointer, follow fails.
+	 */
+	if (instr == FTS_FOLLOW &&
+	    (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) {
+		p->fts_info = fts_stat(sp, p, 1, -1);
+		if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
+			if ((p->fts_symfd =
+			    open(".", O_RDONLY | O_CLOEXEC)) < 0) {
+				p->fts_errno = errno;
+				p->fts_info = FTS_ERR;
+			} else
+				p->fts_flags |= FTS_SYMFOLLOW;
+		}
+		return (p);
+	}
+
+	/* Directory in pre-order. */
+	if (p->fts_info == FTS_D) {
+		/* If skipped or crossed mount point, do post-order visit. */
+		if (instr == FTS_SKIP ||
+		    (ISSET(FTS_XDEV) && p->fts_dev != sp->fts_dev)) {
+			if (p->fts_flags & FTS_SYMFOLLOW)
+				(void) close(p->fts_symfd);
+			if (sp->fts_child) {
+				fts_lfree(sp->fts_child);
+				sp->fts_child = NULL;
+			}
+			p->fts_info = FTS_DP;
+			return (p);
+		}
+
+		/* Rebuild if only read the names and now traversing. */
+		if (sp->fts_child && ISSET(FTS_NAMEONLY)) {
+			CLR(FTS_NAMEONLY);
+			fts_lfree(sp->fts_child);
+			sp->fts_child = NULL;
+		}
+
+		/*
+		 * Cd to the subdirectory.
+		 *
+		 * If have already read and now fail to chdir, whack the list
+		 * to make the names come out right, and set the parent errno
+		 * so the application will eventually get an error condition.
+		 * Set the FTS_DONTCHDIR flag so that when we logically change
+		 * directories back to the parent we don't do a chdir.
+		 *
+		 * If haven't read do so.  If the read fails, fts_build sets
+		 * FTS_STOP or the fts_info field of the node.
+		 */
+		if (sp->fts_child) {
+			if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) {
+				p->fts_errno = errno;
+				p->fts_flags |= FTS_DONTCHDIR;
+				for (p = sp->fts_child; p; p = p->fts_link)
+					p->fts_accpath =
+					    p->fts_parent->fts_accpath;
+			}
+		} else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) {
+			if (ISSET(FTS_STOP))
+				return (NULL);
+			return (p);
+		}
+		p = sp->fts_child;
+		sp->fts_child = NULL;
+		goto name;
+	}
+
+	/* Move to the next node on this level. */
+next:	tmp = p;
+	if ((p = p->fts_link) != NULL) {
+		free(tmp);
+
+		/*
+		 * If reached the top, return to the original directory (or
+		 * the root of the tree), and load the paths for the next root.
+		 */
+		if (p->fts_level == FTS_ROOTLEVEL) {
+			if (FCHDIR(sp, sp->fts_rfd)) {
+				SET(FTS_STOP);
+				return (NULL);
+			}
+			fts_load(sp, p);
+			return (sp->fts_cur = p);
+		}
+
+		/*
+		 * User may have called fts_set on the node.  If skipped,
+		 * ignore.  If followed, get a file descriptor so we can
+		 * get back if necessary.
+		 */
+		if (p->fts_instr == FTS_SKIP)
+			goto next;
+		if (p->fts_instr == FTS_FOLLOW) {
+			p->fts_info = fts_stat(sp, p, 1, -1);
+			if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
+				if ((p->fts_symfd =
+				    open(".", O_RDONLY | O_CLOEXEC)) < 0) {
+					p->fts_errno = errno;
+					p->fts_info = FTS_ERR;
+				} else
+					p->fts_flags |= FTS_SYMFOLLOW;
+			}
+			p->fts_instr = FTS_NOINSTR;
+		}
+
+name:		t = sp->fts_path + NAPPEND(p->fts_parent);
+		*t++ = '/';
+		(void) memmove(t, p->fts_name, p->fts_namelen + 1);
+		return (sp->fts_cur = p);
+	}
+
+	/* Move up to the parent node. */
+	p = tmp->fts_parent;
+	free(tmp);
+
+	if (p->fts_level == FTS_ROOTPARENTLEVEL) {
+		/*
+		 * Done; free everything up and set errno to 0 so the user
+		 * can distinguish between error and EOF.
+		 */
+		free(p);
+		errno = 0;
+		return (sp->fts_cur = NULL);
+	}
+
+	/* NUL terminate the pathname. */
+	sp->fts_path[p->fts_pathlen] = '\0';
+
+	/*
+	 * Return to the parent directory.  If at a root node or came through
+	 * a symlink, go back through the file descriptor.  Otherwise, cd up
+	 * one directory.
+	 */
+	if (p->fts_level == FTS_ROOTLEVEL) {
+		if (FCHDIR(sp, sp->fts_rfd)) {
+			SET(FTS_STOP);
+			sp->fts_cur = p;
+			return (NULL);
+		}
+	} else if (p->fts_flags & FTS_SYMFOLLOW) {
+		if (FCHDIR(sp, p->fts_symfd)) {
+			saved_errno = errno;
+			(void) close(p->fts_symfd);
+			errno = saved_errno;
+			SET(FTS_STOP);
+			sp->fts_cur = p;
+			return (NULL);
+		}
+		(void) close(p->fts_symfd);
+	} else if (!(p->fts_flags & FTS_DONTCHDIR) &&
+	    fts_safe_changedir(sp, p->fts_parent, -1, "..")) {
+		SET(FTS_STOP);
+		sp->fts_cur = p;
+		return (NULL);
+	}
+	p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP;
+	return (sp->fts_cur = p);
+}
+
+/*
+ * Fts_set takes the stream as an argument although it's not used in this
+ * implementation; it would be necessary if anyone wanted to add global
+ * semantics to fts using fts_set.  An error return is allowed for similar
+ * reasons.
+ */
+/*ARGSUSED*/
+int
+fts_set(FTS *sp, FTSENT *p, int instr)
+{
+	if (instr && instr != FTS_AGAIN && instr != FTS_FOLLOW &&
+	    instr != FTS_NOINSTR && instr != FTS_SKIP) {
+		errno = EINVAL;
+		return (1);
+	}
+	p->fts_instr = instr;
+	return (0);
+}
+
+FTSENT *
+fts_children(FTS *sp, int instr)
+{
+	FTSENT *p;
+	int fd;
+
+	if (instr && instr != FTS_NAMEONLY) {
+		errno = EINVAL;
+		return (NULL);
+	}
+
+	/* Set current node pointer. */
+	p = sp->fts_cur;
+
+	/*
+	 * Errno set to 0 so user can distinguish empty directory from
+	 * an error.
+	 */
+	errno = 0;
+
+	/* Fatal errors stop here. */
+	if (ISSET(FTS_STOP))
+		return (NULL);
+
+	/* Return logical hierarchy of user's arguments. */
+	if (p->fts_info == FTS_INIT)
+		return (p->fts_link);
+
+	/*
+	 * If not a directory being visited in pre-order, stop here.  Could
+	 * allow FTS_DNR, assuming the user has fixed the problem, but the
+	 * same effect is available with FTS_AGAIN.
+	 */
+	if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */)
+		return (NULL);
+
+	/* Free up any previous child list. */
+	if (sp->fts_child)
+		fts_lfree(sp->fts_child);
+
+	if (instr == FTS_NAMEONLY) {
+		SET(FTS_NAMEONLY);
+		instr = BNAMES;
+	} else
+		instr = BCHILD;
+
+	/*
+	 * If using chdir on a relative path and called BEFORE fts_read does
+	 * its chdir to the root of a traversal, we can lose -- we need to
+	 * chdir into the subdirectory, and we don't know where the current
+	 * directory is, so we can't get back so that the upcoming chdir by
+	 * fts_read will work.
+	 */
+	if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' ||
+	    ISSET(FTS_NOCHDIR))
+		return (sp->fts_child = fts_build(sp, instr));
+
+	if ((fd = open(".", O_RDONLY | O_CLOEXEC)) < 0)
+		return (NULL);
+	sp->fts_child = fts_build(sp, instr);
+	if (fchdir(fd)) {
+		(void) close(fd);
+		return (NULL);
+	}
+	(void) close(fd);
+	return (sp->fts_child);
+}
+
+/*
+ * This is the tricky part -- do not casually change *anything* in here.  The
+ * idea is to build the linked list of entries that are used by fts_children
+ * and fts_read.  There are lots of special cases.
+ *
+ * The real slowdown in walking the tree is the stat calls.  If FTS_NOSTAT is
+ * set and it's a physical walk (so that symbolic links can't be directories),
+ * we can do things quickly.  First, if it's a 4.4BSD file system, the type
+ * of the file is in the directory entry.  Otherwise, we assume that the number
+ * of subdirectories in a node is equal to the number of links to the parent.
+ * The former skips all stat calls.  The latter skips stat calls in any leaf
+ * directories and for any files after the subdirectories in the directory have
+ * been found, cutting the stat calls by about 2/3.
+ */
+static FTSENT *
+fts_build(FTS *sp, int type)
+{
+	struct dirent *dp;
+	FTSENT *p, *head;
+	FTSENT *cur, *tail;
+	DIR *dirp;
+	void *oldaddr;
+	size_t len, maxlen;
+	int nitems, cderrno, descend, level, nlinks, doadjust;
+	int saved_errno;
+	char *cp;
+
+	/* Set current node pointer. */
+	cur = sp->fts_cur;
+
+	/*
+	 * Open the directory for reading.  If this fails, we're done.
+	 * If being called from fts_read, set the fts_info field.
+	 */
+	if ((dirp = opendir(cur->fts_accpath)) == NULL) {
+		if (type == BREAD) {
+			cur->fts_info = FTS_DNR;
+			cur->fts_errno = errno;
+		}
+		return (NULL);
+	}
+
+	/*
+	 * Nlinks is the number of possible entries of type directory in the
+	 * directory if we're cheating on stat calls, 0 if we're not doing
+	 * any stat calls at all, -1 if we're doing stats on everything.
+	 */
+	if (type == BNAMES)
+		nlinks = 0;
+	else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL))
+		nlinks = cur->fts_nlink - (ISSET(FTS_SEEDOT) ? 0 : 2);
+	else
+		nlinks = -1;
+
+	/*
+	 * If we're going to need to stat anything or we want to descend
+	 * and stay in the directory, chdir.  If this fails we keep going,
+	 * but set a flag so we don't chdir after the post-order visit.
+	 * We won't be able to stat anything, but we can still return the
+	 * names themselves.  Note, that since fts_read won't be able to
+	 * chdir into the directory, it will have to return different path
+	 * names than before, i.e. "a/b" instead of "b".  Since the node
+	 * has already been visited in pre-order, have to wait until the
+	 * post-order visit to return the error.  There is a special case
+	 * here, if there was nothing to stat then it's not an error to
+	 * not be able to stat.  This is all fairly nasty.  If a program
+	 * needed sorted entries or stat information, they had better be
+	 * checking FTS_NS on the returned nodes.
+	 */
+	cderrno = 0;
+	if (nlinks || type == BREAD) {
+		if (fts_safe_changedir(sp, cur, dirfd(dirp), NULL)) {
+			if (nlinks && type == BREAD)
+				cur->fts_errno = errno;
+			cur->fts_flags |= FTS_DONTCHDIR;
+			descend = 0;
+			cderrno = errno;
+			(void) closedir(dirp);
+			dirp = NULL;
+		} else
+			descend = 1;
+	} else
+		descend = 0;
+
+	/*
+	 * Figure out the max file name length that can be stored in the
+	 * current path -- the inner loop allocates more path as necessary.
+	 * We really wouldn't have to do the maxlen calculations here, we
+	 * could do them in fts_read before returning the path, but it's a
+	 * lot easier here since the length is part of the dirent structure.
+	 *
+	 * If not changing directories set a pointer so that can just append
+	 * each new name into the path.
+	 */
+	len = NAPPEND(cur);
+	if (ISSET(FTS_NOCHDIR)) {
+		cp = sp->fts_path + len;
+		*cp++ = '/';
+	}
+	len++;
+	maxlen = sp->fts_pathlen - len;
+
+	/*
+	 * fts_level is signed so we must prevent it from wrapping
+	 * around to FTS_ROOTLEVEL and FTS_ROOTPARENTLEVEL.
+	 */
+	level = cur->fts_level;
+	if (level < FTS_MAXLEVEL)
+		level++;
+
+	/* Read the directory, attaching each entry to the `link' pointer. */
+	doadjust = 0;
+	for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp)); ) {
+		if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name))
+			continue;
+
+		if (!(p = fts_alloc(sp, dp->d_name, strlen(dp->d_name))))
+			goto mem1;
+		if (strlen(dp->d_name) >= maxlen) { /* include space for NUL */
+			oldaddr = sp->fts_path;
+			if (fts_palloc(sp, strlen(dp->d_name) +len + 1)) {
+				/*
+				 * No more memory for path or structures.  Save
+				 * errno, free up the current structure and the
+				 * structures already allocated.
+				 */
+mem1:				saved_errno = errno;
+				free(p);
+				fts_lfree(head);
+				(void) closedir(dirp);
+				cur->fts_info = FTS_ERR;
+				SET(FTS_STOP);
+				errno = saved_errno;
+				return (NULL);
+			}
+			/* Did realloc() change the pointer? */
+			if (oldaddr != sp->fts_path) {
+				doadjust = 1;
+				if (ISSET(FTS_NOCHDIR))
+					cp = sp->fts_path + len;
+			}
+			maxlen = sp->fts_pathlen - len;
+		}
+
+		p->fts_level = level;
+		p->fts_parent = sp->fts_cur;
+		p->fts_pathlen = len + strlen(dp->d_name);
+		if (p->fts_pathlen < len) {
+			/*
+			 * If we wrap, free up the current structure and
+			 * the structures already allocated, then error
+			 * out with ENAMETOOLONG.
+			 */
+			free(p);
+			fts_lfree(head);
+			(void) closedir(dirp);
+			cur->fts_info = FTS_ERR;
+			SET(FTS_STOP);
+			errno = ENAMETOOLONG;
+			return (NULL);
+		}
+
+		if (cderrno) {
+			if (nlinks) {
+				p->fts_info = FTS_NS;
+				p->fts_errno = cderrno;
+			} else
+				p->fts_info = FTS_NSOK;
+			p->fts_accpath = cur->fts_accpath;
+		} else if (nlinks == 0) {
+			p->fts_accpath =
+			    ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name;
+			p->fts_info = FTS_NSOK;
+		} else {
+			/* Build a file name for fts_stat to stat. */
+			if (ISSET(FTS_NOCHDIR)) {
+				p->fts_accpath = p->fts_path;
+				(void) memmove(cp, p->fts_name,
+				    p->fts_namelen + 1);
+				p->fts_info = fts_stat(sp, p, 0, dirfd(dirp));
+			} else {
+				p->fts_accpath = p->fts_name;
+				p->fts_info = fts_stat(sp, p, 0, -1);
+			}
+
+			/* Decrement link count if applicable. */
+			if (nlinks > 0 && (p->fts_info == FTS_D ||
+			    p->fts_info == FTS_DC || p->fts_info == FTS_DOT))
+				--nlinks;
+		}
+
+		/* We walk in directory order so "ls -f" doesn't get upset. */
+		p->fts_link = NULL;
+		if (head == NULL)
+			head = tail = p;
+		else {
+			tail->fts_link = p;
+			tail = p;
+		}
+		++nitems;
+	}
+	if (dirp)
+		(void) closedir(dirp);
+
+	/*
+	 * If realloc() changed the address of the path, adjust the
+	 * addresses for the rest of the tree and the dir list.
+	 */
+	if (doadjust)
+		fts_padjust(sp, head);
+
+	/*
+	 * If not changing directories, reset the path back to original
+	 * state.
+	 */
+	if (ISSET(FTS_NOCHDIR)) {
+		if (len == sp->fts_pathlen || nitems == 0)
+			--cp;
+		*cp = '\0';
+	}
+
+	/*
+	 * If descended after called from fts_children or after called from
+	 * fts_read and nothing found, get back.  At the root level we use
+	 * the saved fd; if one of fts_open()'s arguments is a relative path
+	 * to an empty directory, we wind up here with no other way back.  If
+	 * can't get back, we're done.
+	 */
+	if (descend && (type == BCHILD || !nitems) &&
+	    (cur->fts_level == FTS_ROOTLEVEL ? FCHDIR(sp, sp->fts_rfd) :
+	    fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) {
+		cur->fts_info = FTS_ERR;
+		SET(FTS_STOP);
+		return (NULL);
+	}
+
+	/* If didn't find anything, return NULL. */
+	if (!nitems) {
+		if (type == BREAD)
+			cur->fts_info = FTS_DP;
+		return (NULL);
+	}
+
+	/* Sort the entries. */
+	if (sp->fts_compar && nitems > 1)
+		head = fts_sort(sp, head, nitems);
+	return (head);
+}
+
+static ushort_t
+fts_stat(FTS *sp, FTSENT *p, int follow, int dfd)
+{
+	FTSENT *t;
+	dev_t dev;
+	ino_t ino;
+	struct stat *sbp, sb;
+	int saved_errno;
+	const char *path;
+
+	if (dfd == -1) {
+		path = p->fts_accpath;
+		dfd = AT_FDCWD;
+	} else
+		path = p->fts_name;
+
+	/* If user needs stat info, stat buffer already allocated. */
+	sbp = ISSET(FTS_NOSTAT) ? &sb : p->fts_statp;
+
+	/*
+	 * If doing a logical walk, or application requested FTS_FOLLOW, do
+	 * a stat(2).  If that fails, check for a non-existent symlink.  If
+	 * fail, set the errno from the stat call.
+	 */
+	if (ISSET(FTS_LOGICAL) || follow) {
+		if (fstatat(dfd, path, sbp, 0)) {
+			saved_errno = errno;
+			if (!fstatat(dfd, path, sbp, AT_SYMLINK_NOFOLLOW)) {
+				errno = 0;
+				return (FTS_SLNONE);
+			}
+			p->fts_errno = saved_errno;
+			goto err;
+		}
+	} else if (fstatat(dfd, path, sbp, AT_SYMLINK_NOFOLLOW)) {
+		p->fts_errno = errno;
+err:		(void) memset(sbp, 0, sizeof (struct stat));
+		return (FTS_NS);
+	}
+
+	if (S_ISDIR(sbp->st_mode)) {
+		/*
+		 * Set the device/inode.  Used to find cycles and check for
+		 * crossing mount points.  Also remember the link count, used
+		 * in fts_build to limit the number of stat calls.  It is
+		 * understood that these fields are only referenced if fts_info
+		 * is set to FTS_D.
+		 */
+		dev = p->fts_dev = sbp->st_dev;
+		ino = p->fts_ino = sbp->st_ino;
+		p->fts_nlink = sbp->st_nlink;
+
+		if (ISDOT(p->fts_name))
+			return (FTS_DOT);
+
+		/*
+		 * Cycle detection is done by brute force when the directory
+		 * is first encountered.  If the tree gets deep enough or the
+		 * number of symbolic links to directories is high enough,
+		 * something faster might be worthwhile.
+		 */
+		for (t = p->fts_parent;
+		    t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent)
+			if (ino == t->fts_ino && dev == t->fts_dev) {
+				p->fts_cycle = t;
+				return (FTS_DC);
+			}
+		return (FTS_D);
+	}
+	if (S_ISLNK(sbp->st_mode))
+		return (FTS_SL);
+	if (S_ISREG(sbp->st_mode))
+		return (FTS_F);
+	return (FTS_DEFAULT);
+}
+
+static FTSENT *
+fts_sort(FTS *sp, FTSENT *head, int nitems)
+{
+	FTSENT **ap, *p;
+
+	/*
+	 * Construct an array of pointers to the structures and call qsort(3).
+	 * Reassemble the array in the order returned by qsort.  If unable to
+	 * sort for memory reasons, return the directory entries in their
+	 * current order.  Allocate enough space for the current needs plus
+	 * 40 so don't realloc one entry at a time.
+	 */
+	if (nitems > sp->fts_nitems) {
+		struct _ftsent **a;
+
+		sp->fts_nitems = nitems + 40;
+		if ((a = reallocarray(sp->fts_array,
+		    sp->fts_nitems, sizeof (FTSENT *))) == NULL) {
+			free(sp->fts_array);
+			sp->fts_array = NULL;
+			sp->fts_nitems = 0;
+			return (head);
+		}
+		sp->fts_array = a;
+	}
+	for (ap = sp->fts_array, p = head; p; p = p->fts_link)
+		*ap++ = p;
+	qsort(sp->fts_array, nitems, sizeof (FTSENT *), sp->fts_compar);
+	for (head = *(ap = sp->fts_array); --nitems; ++ap)
+		ap[0]->fts_link = ap[1];
+	ap[0]->fts_link = NULL;
+	return (head);
+}
+
+static FTSENT *
+fts_alloc(FTS *sp, char *name, size_t namelen)
+{
+	FTSENT *p;
+	size_t len;
+
+	/*
+	 * The file name is a variable length array and no stat structure is
+	 * necessary if the user has set the nostat bit.  Allocate the FTSENT
+	 * structure, the file name and the stat structure in one chunk, but
+	 * be careful that the stat structure is reasonably aligned.  Since the
+	 * fts_name field is declared to be of size 1, the fts_name pointer is
+	 * namelen + 2 before the first possible address of the stat structure.
+	 */
+	len = sizeof (FTSENT) + namelen;
+	if (!ISSET(FTS_NOSTAT))
+		len += sizeof (struct stat) + ALIGNBYTES;
+	if ((p = calloc(1, len)) == NULL)
+		return (NULL);
+
+	p->fts_path = sp->fts_path;
+	p->fts_namelen = namelen;
+	p->fts_instr = FTS_NOINSTR;
+	if (!ISSET(FTS_NOSTAT))
+		p->fts_statp = (struct stat *)ALIGN(p->fts_name + namelen + 2);
+	(void) memcpy(p->fts_name, name, namelen);
+
+	return (p);
+}
+
+static void
+fts_lfree(FTSENT *head)
+{
+	FTSENT *p;
+
+	/* Free a linked list of structures. */
+	while ((p = head) != NULL) {
+		head = head->fts_link;
+		free(p);
+	}
+}
+
+/*
+ * Allow essentially unlimited paths; find, rm, ls should all work on any tree.
+ * Most systems will allow creation of paths much longer than PATH_MAX, even
+ * though the kernel won't resolve them.  Add the size (not just what's needed)
+ * plus 256 bytes so don't realloc the path 2 bytes at a time.
+ */
+static int
+fts_palloc(FTS *sp, size_t more)
+{
+	char *p;
+
+	/*
+	 * Check for possible wraparound.
+	 */
+	more += 256;
+	if (sp->fts_pathlen + more < sp->fts_pathlen) {
+		free(sp->fts_path);
+		sp->fts_path = NULL;
+		errno = ENAMETOOLONG;
+		return (1);
+	}
+	sp->fts_pathlen += more;
+	p = realloc(sp->fts_path, sp->fts_pathlen);
+	if (p == NULL) {
+		free(sp->fts_path);
+		sp->fts_path = NULL;
+		return (1);
+	}
+	sp->fts_path = p;
+	return (0);
+}
+
+/*
+ * When the path is realloc'd, have to fix all of the pointers in structures
+ * already returned.
+ */
+static void
+fts_padjust(FTS *sp, FTSENT *head)
+{
+	FTSENT *p;
+	char *addr = sp->fts_path;
+
+#define	ADJUST(p) {							\
+	if ((p)->fts_accpath != (p)->fts_name) {			\
+		(p)->fts_accpath =					\
+		    (char *)addr + ((p)->fts_accpath - (p)->fts_path);	\
+	}								\
+	(p)->fts_path = addr;						\
+}
+	/* Adjust the current set of children. */
+	for (p = sp->fts_child; p; p = p->fts_link)
+		ADJUST(p);
+
+	/* Adjust the rest of the tree, including the current level. */
+	for (p = head; p->fts_level >= FTS_ROOTLEVEL; ) {
+		ADJUST(p);
+		p = p->fts_link ? p->fts_link : p->fts_parent;
+	}
+}
+
+static size_t
+fts_maxarglen(char * const *argv)
+{
+	size_t len, max;
+
+	for (max = 0; *argv; ++argv)
+		if ((len = strlen(*argv)) > max)
+			max = len;
+	return (max + 1);
+}
+
+/*
+ * Change to dir specified by fd or p->fts_accpath without getting
+ * tricked by someone changing the world out from underneath us.
+ * Assumes p->fts_dev and p->fts_ino are filled in.
+ */
+static int
+fts_safe_changedir(FTS *sp, FTSENT *p, int fd, char *path)
+{
+	int ret, oerrno, newfd;
+	struct stat sb;
+
+	newfd = fd;
+	if (ISSET(FTS_NOCHDIR))
+		return (0);
+	/*
+	 * This originally specified O_DIRECTORY as well - restore once/if we
+	 * implement the flag.
+	 */
+	if (fd < 0 && (newfd = open(path, O_RDONLY|O_CLOEXEC)) < 0)
+		return (-1);
+	if (fstat(newfd, &sb)) {
+		ret = -1;
+		goto bail;
+	}
+	if (p->fts_dev != sb.st_dev || p->fts_ino != sb.st_ino) {
+		errno = ENOENT;		/* disinformation */
+		ret = -1;
+		goto bail;
+	}
+	ret = fchdir(newfd);
+bail:
+	oerrno = errno;
+	if (fd < 0)
+		(void) close(newfd);
+	errno = oerrno;
+	return (ret);
+}
diff --git a/usr/src/lib/libc/port/gen/reallocarray.c b/usr/src/lib/libc/port/gen/reallocarray.c
new file mode 100644
index 0000000000..ecc4d25fa9
--- /dev/null
+++ b/usr/src/lib/libc/port/gen/reallocarray.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/*
+ * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
+ * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
+ */
+#define	MUL_NO_OVERFLOW	((size_t)1 << (sizeof (size_t) * 4))
+
+void *
+reallocarray(void *optr, size_t nmemb, size_t size)
+{
+	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
+	    nmemb > 0 && SIZE_MAX / nmemb < size) {
+		errno = ENOMEM;
+		return (NULL);
+	}
+	return (realloc(optr, size * nmemb));
+}
diff --git a/usr/src/lib/libc/port/gen/strtonum.c b/usr/src/lib/libc/port/gen/strtonum.c
new file mode 100644
index 0000000000..e180769313
--- /dev/null
+++ b/usr/src/lib/libc/port/gen/strtonum.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2004 Ted Unangst and Todd Miller
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#define	INVALID		1
+#define	TOOSMALL	2
+#define	TOOLARGE	3
+
+long long
+strtonum(const char *numstr, long long minval, long long maxval,
+    const char **errstrp)
+{
+	long long ll = 0;
+	int error = 0;
+	char *ep;
+	struct errval {
+		const char *errstr;
+		int err;
+	} ev[4] = {
+		{ NULL,		0 },
+		{ "invalid",	EINVAL },
+		{ "too small",	ERANGE },
+		{ "too large",	ERANGE },
+	};
+
+	ev[0].err = errno;
+	errno = 0;
+	if (minval > maxval) {
+		error = INVALID;
+	} else {
+		ll = strtoll(numstr, &ep, 10);
+		if (numstr == ep || *ep != '\0')
+			error = INVALID;
+		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
+			error = TOOSMALL;
+		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
+			error = TOOLARGE;
+	}
+	if (errstrp != NULL)
+		*errstrp = ev[error].errstr;
+	errno = ev[error].err;
+	if (error)
+		ll = 0;
+
+	return (ll);
+}
diff --git a/usr/src/lib/libc/port/llib-lc b/usr/src/lib/libc/port/llib-lc
index d33a1d39c2..db73a140f9 100644
--- a/usr/src/lib/libc/port/llib-lc
+++ b/usr/src/lib/libc/port/llib-lc
@@ -21,7 +21,7 @@
 
 /*
  * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
+ * Copyright 2017 Nexenta Systems, Inc.
  * Copyright 2013 OmniTI Computer Consulting, Inc. All rights reserved.
  * Copyright (c) 2013 Gary Mills
  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
@@ -50,6 +50,7 @@
 #include <float.h>
 #include <fmtmsg.h>
 #include <fnmatch.h>
+#include <fts.h>
 #include <ftw.h>
 #include <glob.h>
 #include <getwidth.h>
@@ -435,7 +436,7 @@ int flock(int filedes, int operation);
 /* fmtmsg.c */
 int addseverity(int value, const char *string);
 int fmtmsg(long class, const char *label, int severity, const char *text,
-		const char *action, const char *tag);
+    const char *action, const char *tag);
 
 /* ftime.c */
 int ftime(struct timeb *tp);
@@ -443,6 +444,13 @@ int ftime(struct timeb *tp);
 /* ftok.c */
 key_t ftok(const char *path, int id);
 
+/* fts.c */
+FTSENT *fts_children(FTS *, int);
+int fts_close(FTS *);
+FTS *fts_open(char * const *, int, int (*)(const FTSENT **, const FTSENT **));
+FTSENT *fts_read(FTS *);
+int fts_set(FTS *, FTSENT *, int);
+
 /* gcvt.c */
 char *gcvt(double number, int ndigit, char *buf);
 
@@ -820,6 +828,9 @@ size_t rctlblk_size(void);
 /* readdir.c */
 struct dirent *readdir(DIR *dirp);
 
+/* reallocarray.c */
+void *reallocarray(void *, size_t, size_t);
+
 /* realpath.c */
 char *realpath(const char *_RESTRICT_KYWD raw, char *_RESTRICT_KYWD canon);
 
@@ -973,6 +984,9 @@ char *strtok_r(char *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
 long strtol(const char *_RESTRICT_KYWD str, char **_RESTRICT_KYWD nptr,
 	int base);
 
+/* strtonum.c */
+long long strtonum(const char *, long long, long long, const char **);
+
 /* strtoul.c */
 unsigned long strtoul(const char *_RESTRICT_KYWD str,
 	char **_RESTRICT_KYWD nptr, int base);
diff --git a/usr/src/lib/libc/port/mapfile-vers b/usr/src/lib/libc/port/mapfile-vers
index 9392abc540..c9e03580e2 100644
--- a/usr/src/lib/libc/port/mapfile-vers
+++ b/usr/src/lib/libc/port/mapfile-vers
@@ -93,6 +93,17 @@ $if _x86 && _ELF64
 $add amd64
 $endif
 
+SYMBOL_VERSION ILLUMOS_0.23 {	# openbsd compat
+    protected:
+	fts_children;
+	fts_close;
+	fts_open;
+	fts_read;
+	fts_set;
+	reallocarray;
+	strtonum;
+} ILLUMOS_0.22;
+
 SYMBOL_VERSION ILLUMOS_0.22 {	# endian(3C)
     protected:
 	htobe16;
diff --git a/usr/src/lib/libc/sparc/Makefile.com b/usr/src/lib/libc/sparc/Makefile.com
index 7c8f14372d..b478c61a74 100644
--- a/usr/src/lib/libc/sparc/Makefile.com
+++ b/usr/src/lib/libc/sparc/Makefile.com
@@ -18,14 +18,13 @@
 #
 # CDDL HEADER END
 #
+
 #
 # Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright 2016 Joyent, Inc.
 # Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved.
 # Copyright 2013 Garrett D'Amore <garrett@damore.org>
-#
-# Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
-# Use is subject to license terms.
+# Copyright 2017 Nexenta Systems, Inc.
 #
 
 LIBCDIR=	$(SRC)/lib/libc
@@ -410,14 +409,14 @@ PORTGEN=			\
 	addsev.o		\
 	ascii_strncasecmp.o	\
 	assert.o		\
+	atexit.o		\
+	atfork.o		\
 	atof.o			\
 	atoi.o			\
 	atol.o			\
 	atoll.o			\
 	attrat.o		\
 	attropen.o		\
-	atexit.o		\
-	atfork.o		\
 	basename.o		\
 	calloc.o		\
 	catgets.o		\
@@ -459,8 +458,10 @@ PORTGEN=			\
 	fmtmsg.o		\
 	ftime.o			\
 	ftok.o			\
+	fts.o			\
 	ftw.o			\
 	gcvt.o			\
+	get_nprocs.o		\
 	getauxv.o		\
 	getcwd.o		\
 	getdate_err.o		\
@@ -478,7 +479,6 @@ PORTGEN=			\
 	getlogin.o		\
 	getmntent.o		\
 	getnetgrent.o		\
-	get_nprocs.o		\
 	getopt.o		\
 	getopt_long.o		\
 	getpagesize.o		\
@@ -560,8 +560,8 @@ PORTGEN=			\
 	posix_madvise.o		\
 	posix_memalign.o	\
 	priocntl.o		\
-	privlib.o		\
 	priv_str_xlate.o	\
+	privlib.o		\
 	psecflags.o		\
 	psiginfo.o		\
 	psignal.o		\
@@ -574,6 +574,7 @@ PORTGEN=			\
 	rctlops.o		\
 	readdir.o		\
 	readdir_r.o		\
+	reallocarray.o		\
 	realpath.o		\
 	reboot.o		\
 	regexpr.o		\
@@ -615,6 +616,7 @@ PORTGEN=			\
 	strtoimax.o		\
 	strtok.o		\
 	strtok_r.o		\
+	strtonum.o		\
 	strtoumax.o		\
 	swab.o			\
 	swapctl.o		\
@@ -1175,23 +1177,23 @@ SRCS=							\
 	$(XATTROBJS:%.o=$(SRC)/common/xattr/%.c)	\
 	$(COMOBJS:%.o=$(SRC)/common/util/%.c)		\
 	$(DTRACEOBJS:%.o=$(SRC)/common/dtrace/%.c)	\
-	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)			\
-	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)			\
-	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)		\
-	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)		\
-	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)		\
-	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)		\
-	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)		\
-	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)			\
-	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)			\
-	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)			\
-	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)		\
-	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)		\
-	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)		\
-	$(THREADSMACHOBJS:%.o=$(LIBCDIR)/$(MACH)/threads/%.c)	\
+	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)		\
+	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)		\
+	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)	\
+	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)	\
+	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)	\
+	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)	\
+	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)	\
+	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)		\
+	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)		\
+	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)		\
+	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)	\
+	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)	\
+	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)	\
+	$(THREADSMACHOBJS:%.o=$(LIBCDIR)/$(MACH)/threads/%.c) \
 	$(UNICODEOBJS:%.o=$(SRC)/common/unicode/%.c)	\
-	$(UNWINDMACHOBJS:%.o=$(LIBCDIR)/port/unwind/%.c)	\
-	$(FPOBJS:%.o=$(LIBCDIR)/$(MACH)/fp/%.c)			\
+	$(UNWINDMACHOBJS:%.o=$(LIBCDIR)/port/unwind/%.c) \
+	$(FPOBJS:%.o=$(LIBCDIR)/$(MACH)/fp/%.c)		\
 	$(LIBCBASE)/crt/_ftou.c				\
 	$(LIBCBASE)/gen/_xregs_clrptr.c			\
 	$(LIBCBASE)/gen/byteorder.c			\
diff --git a/usr/src/lib/libc/sparcv9/Makefile.com b/usr/src/lib/libc/sparcv9/Makefile.com
index 6744289046..70d1fdea43 100644
--- a/usr/src/lib/libc/sparcv9/Makefile.com
+++ b/usr/src/lib/libc/sparcv9/Makefile.com
@@ -18,15 +18,14 @@
 #
 # CDDL HEADER END
 #
+
 #
 # Copyright 2016 Gary Mills
 # Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright (c) 2015, Joyent, Inc.  All rights reserved.
 # Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved.
 # Copyright 2013 Garrett D'Amore <garrett@damore.org>
-#
-# Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
-# Use is subject to license terms.
+# Copyright 2017 Nexenta Systems, Inc.
 #
 
 LIBCDIR=	$(SRC)/lib/libc
@@ -368,14 +367,14 @@ PORTGEN=			\
 	addsev.o		\
 	ascii_strncasecmp.o	\
 	assert.o		\
-	attrat.o		\
+	atexit.o		\
+	atfork.o		\
 	atof.o			\
 	atoi.o			\
 	atol.o			\
 	atoll.o			\
+	attrat.o		\
 	attropen.o		\
-	atexit.o		\
-	atfork.o		\
 	basename.o		\
 	calloc.o		\
 	catgets.o		\
@@ -417,8 +416,10 @@ PORTGEN=			\
 	fmtmsg.o		\
 	ftime.o			\
 	ftok.o			\
+	fts.o			\
 	ftw.o			\
 	gcvt.o			\
+	get_nprocs.o		\
 	getauxv.o		\
 	getcwd.o		\
 	getdate_err.o		\
@@ -436,7 +437,6 @@ PORTGEN=			\
 	getlogin.o		\
 	getmntent.o		\
 	getnetgrent.o		\
-	get_nprocs.o		\
 	getopt.o		\
 	getopt_long.o		\
 	getpagesize.o		\
@@ -518,8 +518,8 @@ PORTGEN=			\
 	posix_madvise.o		\
 	posix_memalign.o	\
 	priocntl.o		\
-	privlib.o		\
 	priv_str_xlate.o	\
+	privlib.o		\
 	psecflags.o		\
 	psiginfo.o		\
 	psignal.o		\
@@ -532,6 +532,7 @@ PORTGEN=			\
 	rctlops.o		\
 	readdir.o		\
 	readdir_r.o		\
+	reallocarray.o		\
 	realpath.o		\
 	reboot.o		\
 	regexpr.o		\
@@ -573,6 +574,7 @@ PORTGEN=			\
 	strtoimax.o		\
 	strtok.o		\
 	strtok_r.o		\
+	strtonum.o		\
 	strtoumax.o		\
 	swab.o			\
 	swapctl.o		\
@@ -1105,23 +1107,23 @@ SRCS=							\
 	$(ATOMICOBJS:%.o=$(SRC)/common/atomic/%.c)	\
 	$(XATTROBJS:%.o=$(SRC)/common/xattr/%.c)	\
 	$(COMOBJS:%.o=$(SRC)/common/util/%.c)		\
-	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)			\
-	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)			\
-	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)		\
-	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)		\
-	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)		\
-	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)		\
-	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)		\
-	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)			\
-	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)			\
-	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)			\
-	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)		\
-	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)		\
-	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)		\
-	$(THREADSMACHOBJS:%.o=$(LIBCDIR)/$(MACH)/threads/%.c)	\
+	$(PORTFP:%.o=$(LIBCDIR)/port/fp/%.c)		\
+	$(PORTGEN:%.o=$(LIBCDIR)/port/gen/%.c)		\
+	$(PORTI18N:%.o=$(LIBCDIR)/port/i18n/%.c)	\
+	$(PORTLOCALE:%.o=$(LIBCDIR)/port/locale/%.c)	\
+	$(PORTPRINT:%.o=$(LIBCDIR)/port/print/%.c)	\
+	$(PORTREGEX:%.o=$(LIBCDIR)/port/regex/%.c)	\
+	$(PORTSTDIO:%.o=$(LIBCDIR)/port/stdio/%.c)	\
+	$(PORTSYS:%.o=$(LIBCDIR)/port/sys/%.c)		\
+	$(AIOOBJS:%.o=$(LIBCDIR)/port/aio/%.c)		\
+	$(RTOBJS:%.o=$(LIBCDIR)/port/rt/%.c)		\
+	$(SECFLAGSOBJS:%.o=$(SRC)/common/secflags/%.c)	\
+	$(TPOOLOBJS:%.o=$(LIBCDIR)/port/tpool/%.c)	\
+	$(THREADSOBJS:%.o=$(LIBCDIR)/port/threads/%.c)	\
+	$(THREADSMACHOBJS:%.o=$(LIBCDIR)/$(MACH)/threads/%.c) \
 	$(UNICODEOBJS:%.o=$(SRC)/common/unicode/%.c)	\
-	$(UNWINDMACHOBJS:%.o=$(LIBCDIR)/port/unwind/%.c)	\
-	$(FPOBJS:%.o=$(LIBCDIR)/$(MACH)/fp/%.c)			\
+	$(UNWINDMACHOBJS:%.o=$(LIBCDIR)/port/unwind/%.c) \
+	$(FPOBJS:%.o=$(LIBCDIR)/$(MACH)/fp/%.c)		\
 	$(FPOBJS64:%.o=$(LIBCBASE)/fp/%.c)		\
 	$(LIBCBASE)/crt/_ftou.c				\
 	$(LIBCBASE)/gen/_xregs_clrptr.c			\