build: Add legacy support for futimens() and utimensat().

In order to allow using utimensat() in install(1), add futimens() and
utimensat() to -legacy.

The files futimens.c and utimensat.c are modified copies of the files under
lib/libc/sys/ since the libc versions use symbols that do not exist in the
libc on the build system (sys_futimens and sys_utimensat) . I expect the
next non-sweeping change to both sets of files to be to delete them, anyway.

This will allow reverting r299942 (which is a revert of r299850) enabling
nanosecond timestamps in install(1).

Reviewed by:	bdrewery

5 files changed, 261 insertions, 1 deletions

diff --git a/Makefile.inc1 b/Makefile.inc1
index dd17644c7e10..0daa440abc69 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -646,6 +646,8 @@ _worldtmp: .PHONY
 	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.groff.dist \
 	    -p ${WORLDTMP}/legacy/usr >/dev/null
 .endif
+	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.include.dist \
+	    -p ${WORLDTMP}/legacy/usr/include >/dev/null
 	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.usr.dist \
 	    -p ${WORLDTMP}/usr >/dev/null
 	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.include.dist \
diff --git a/tools/build/Makefile b/tools/build/Makefile
index 2617d8d4c4d5..63b147ceb985 100644
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -4,9 +4,11 @@
 
 LIB=		egacy
 SRC=
-INCSGROUPS=	INCS
+INCSGROUPS=	INCS SYSINCS
 INCS=
 
+SYSINCSDIR=	${INCLUDEDIR}/sys
+
 BOOTSTRAPPING?=	0
 
 _WITH_PWCACHEDB!= grep -c pwcache_groupdb /usr/include/grp.h || true
@@ -33,6 +35,12 @@ SRCS+=		reallocarray.c
 CFLAGS+=	-I${.CURDIR}/../../lib/libc/include
 .endif
 
+_WITH_UTIMENS!= grep -c utimensat /usr/include/sys/stat.h || true
+.if ${_WITH_UTIMENS} == 0
+SYSINCS+=	stat.h
+SRCS+=		futimens.c utimensat.c
+.endif
+
 .if empty(SRCS)
 SRCS=		dummy.c
 .endif
diff --git a/tools/build/futimens.c b/tools/build/futimens.c
new file mode 100644
index 000000000000..7d1cae701e97
--- /dev/null
+++ b/tools/build/futimens.c
@@ -0,0 +1,96 @@
+/*-
+ * Copyright (c) 2015 Jilles Tjoelker
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <time.h>
+
+#ifndef	UTIME_NOW
+#define	UTIME_NOW	-1
+#define	UTIME_OMIT	-2
+#endif
+
+int
+futimens(int fd, const struct timespec times[2])
+{
+	struct timeval now, tv[2], *tvp;
+	struct stat sb;
+	int osreldate;
+
+	if (times == NULL || (times[0].tv_nsec == UTIME_NOW &&
+	    times[1].tv_nsec == UTIME_NOW))
+		tvp = NULL;
+	else if (times[0].tv_nsec == UTIME_OMIT &&
+	    times[1].tv_nsec == UTIME_OMIT)
+		return (0);
+	else {
+		if ((times[0].tv_nsec < 0 || times[0].tv_nsec > 999999999) &&
+		    times[0].tv_nsec != UTIME_NOW &&
+		    times[0].tv_nsec != UTIME_OMIT) {
+			errno = EINVAL;
+			return (-1);
+		}
+		if ((times[1].tv_nsec < 0 || times[1].tv_nsec > 999999999) &&
+		    times[1].tv_nsec != UTIME_NOW &&
+		    times[1].tv_nsec != UTIME_OMIT) {
+			errno = EINVAL;
+			return (-1);
+		}
+		tv[0].tv_sec = times[0].tv_sec;
+		tv[0].tv_usec = times[0].tv_nsec / 1000;
+		tv[1].tv_sec = times[1].tv_sec;
+		tv[1].tv_usec = times[1].tv_nsec / 1000;
+		tvp = tv;
+		if (times[0].tv_nsec == UTIME_OMIT ||
+		    times[1].tv_nsec == UTIME_OMIT) {
+			if (fstat(fd, &sb) == -1)
+				return (-1);
+			if (times[0].tv_nsec == UTIME_OMIT) {
+				tv[0].tv_sec = sb.st_atim.tv_sec;
+				tv[0].tv_usec = sb.st_atim.tv_nsec / 1000;
+			}
+			if (times[1].tv_nsec == UTIME_OMIT) {
+				tv[1].tv_sec = sb.st_mtim.tv_sec;
+				tv[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
+			}
+		}
+		if (times[0].tv_nsec == UTIME_NOW ||
+		    times[1].tv_nsec == UTIME_NOW) {
+			if (gettimeofday(&now, NULL) == -1)
+				return (-1);
+			if (times[0].tv_nsec == UTIME_NOW)
+				tv[0] = now;
+			if (times[1].tv_nsec == UTIME_NOW)
+				tv[1] = now;
+		}
+	}
+	return (futimes(fd, tvp));
+}
diff --git a/tools/build/stat.h b/tools/build/stat.h
new file mode 100644
index 000000000000..18d1460fcf67
--- /dev/null
+++ b/tools/build/stat.h
@@ -0,0 +1,46 @@
+/*-
+ * Copyright (c) 2016 Jilles Tjoelker <jilles@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _LEGACY_SYS_STAT_H_
+#define	_LEGACY_SYS_STAT_H_
+
+#include_next <sys/stat.h>
+
+#ifndef	UTIME_NOW
+#define	UTIME_NOW	-1
+#define	UTIME_OMIT	-2
+#endif
+
+__BEGIN_DECLS
+
+int futimens(int, const struct timespec *);
+int utimensat(int, const char *, const struct timespec *, int);
+
+__END_DECLS
+
+#endif /* !_LEGACY_SYS_STAT_H_ */
diff --git a/tools/build/utimensat.c b/tools/build/utimensat.c
new file mode 100644
index 000000000000..210599303cb6
--- /dev/null
+++ b/tools/build/utimensat.c
@@ -0,0 +1,108 @@
+/*-
+ * Copyright (c) 2015 Jilles Tjoelker
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <time.h>
+
+#ifndef	UTIME_NOW
+#define	UTIME_NOW	-1
+#define	UTIME_OMIT	-2
+#endif
+
+int
+utimensat(int fd, const char *path, const struct timespec times[2], int flag)
+{
+	struct timeval now, tv[2], *tvp;
+	struct stat sb;
+	int osreldate;
+
+	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+	if (times == NULL || (times[0].tv_nsec == UTIME_NOW &&
+	    times[1].tv_nsec == UTIME_NOW))
+		tvp = NULL;
+	else if (times[0].tv_nsec == UTIME_OMIT &&
+	    times[1].tv_nsec == UTIME_OMIT)
+		return (0);
+	else {
+		if ((times[0].tv_nsec < 0 || times[0].tv_nsec > 999999999) &&
+		    times[0].tv_nsec != UTIME_NOW &&
+		    times[0].tv_nsec != UTIME_OMIT) {
+			errno = EINVAL;
+			return (-1);
+		}
+		if ((times[1].tv_nsec < 0 || times[1].tv_nsec > 999999999) &&
+		    times[1].tv_nsec != UTIME_NOW &&
+		    times[1].tv_nsec != UTIME_OMIT) {
+			errno = EINVAL;
+			return (-1);
+		}
+		tv[0].tv_sec = times[0].tv_sec;
+		tv[0].tv_usec = times[0].tv_nsec / 1000;
+		tv[1].tv_sec = times[1].tv_sec;
+		tv[1].tv_usec = times[1].tv_nsec / 1000;
+		tvp = tv;
+		if (times[0].tv_nsec == UTIME_OMIT ||
+		    times[1].tv_nsec == UTIME_OMIT) {
+			if (fstatat(fd, path, &sb, flag) == -1)
+				return (-1);
+			if (times[0].tv_nsec == UTIME_OMIT) {
+				tv[0].tv_sec = sb.st_atim.tv_sec;
+				tv[0].tv_usec = sb.st_atim.tv_nsec / 1000;
+			}
+			if (times[1].tv_nsec == UTIME_OMIT) {
+				tv[1].tv_sec = sb.st_mtim.tv_sec;
+				tv[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
+			}
+		}
+		if (times[0].tv_nsec == UTIME_NOW ||
+		    times[1].tv_nsec == UTIME_NOW) {
+			if (gettimeofday(&now, NULL) == -1)
+				return (-1);
+			if (times[0].tv_nsec == UTIME_NOW)
+				tv[0] = now;
+			if (times[1].tv_nsec == UTIME_NOW)
+				tv[1] = now;
+		}
+	}
+	if ((flag & AT_SYMLINK_NOFOLLOW) == 0)
+		return (futimesat(fd, path, tvp));
+	else if ((flag & AT_SYMLINK_NOFOLLOW) != 0 &&
+	    (fd == AT_FDCWD || path[0] == '/'))
+		return (lutimes(path, tvp));
+	else {
+		errno = ENOTSUP;
+		return (-1);
+	}
+}