From 09b81d30ae629d75d03972b872eab71e24605bb6 Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Mon, 29 Aug 2016 05:37:03 +0000
Subject: MFC r304209: The fdatasync(2) call must be cancellation point.

---
 lib/libc/include/libc_private.h  |  2 ++
 lib/libc/sys/Makefile.inc        |  1 +
 lib/libc/sys/fdatasync.c         | 46 ++++++++++++++++++++++++++++++++++++++++
 lib/libc/sys/interposing_table.c |  1 +
 4 files changed, 50 insertions(+)
 create mode 100644 lib/libc/sys/fdatasync.c

(limited to 'lib/libc')

diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h
index 8c4d72d..cf346f1 100644
--- a/lib/libc/include/libc_private.h
+++ b/lib/libc/include/libc_private.h
@@ -228,6 +228,7 @@ enum {
 	INTERPOS_wait6,
 	INTERPOS_ppoll,
 	INTERPOS_map_stacks_exec,
+	INTERPOS_fdatasync,
 	INTERPOS_MAX
 };
 
@@ -318,6 +319,7 @@ int		__sys_clock_gettime(__clockid_t, struct timespec *ts);
 int		__sys_close(int);
 int		__sys_connect(int, const struct sockaddr *, __socklen_t);
 int		__sys_fcntl(int, int, ...);
+int		__sys_fdatasync(int);
 int		__sys_fsync(int);
 __pid_t		__sys_fork(void);
 int		__sys_ftruncate(int, __off_t);
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index a2be249..a37c566 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -37,6 +37,7 @@ INTERPOSED = \
 	close \
 	connect \
 	fcntl \
+	fdatasync \
 	fsync \
 	fork \
 	kevent \
diff --git a/lib/libc/sys/fdatasync.c b/lib/libc/sys/fdatasync.c
new file mode 100644
index 0000000..fed9791
--- /dev/null
+++ b/lib/libc/sys/fdatasync.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2016 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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(s), this list of conditions and the following disclaimer as
+ *    the first lines of this file unmodified other than the possible
+ *    addition of one or more copyright notices.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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/types.h>
+#include <sys/fcntl.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+int
+fdatasync(int fd)
+{
+
+	return (((int (*)(int))__libc_interposing[INTERPOS_fdatasync])(fd));
+}
diff --git a/lib/libc/sys/interposing_table.c b/lib/libc/sys/interposing_table.c
index 75bb280..1447e42 100644
--- a/lib/libc/sys/interposing_table.c
+++ b/lib/libc/sys/interposing_table.c
@@ -79,6 +79,7 @@ interpos_func_t __libc_interposing[INTERPOS_MAX] = {
 	SLOT(wait6, __sys_wait6),
 	SLOT(ppoll, __sys_ppoll),
 	SLOT(map_stacks_exec, __libc_map_stacks_exec),
+	SLOT(fdatasync, __sys_fdatasync),
 };
 #undef SLOT
 
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