From d602a6b942e32f4f9a36b6c44471cfcd80a81bb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20V=C3=A1zquez=20P=C3=BAa?= <davazp@gmail.com>
Date: Fri, 19 Apr 2019 20:42:52 +0200
Subject: [PATCH] Fix sync_all on macos/ios

sync_all should flush all metadata in macos/ios, so it should call
fcntl with the F_FULLFSYNC flag as sync_data does.

Fixes #55920
---
 src/libstd/sys/unix/fs.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index a14db108c34..761f1d8c673 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -526,8 +526,15 @@ impl File {
     }
 
     pub fn fsync(&self) -> io::Result<()> {
-        cvt_r(|| unsafe { libc::fsync(self.0.raw()) })?;
-        Ok(())
+        cvt_r(|| unsafe { os_fsync(self.0.raw()) })?;
+        return Ok(());
+
+        #[cfg(any(target_os = "macos", target_os = "ios"))]
+        unsafe fn os_fsync(fd: c_int) -> c_int {
+            libc::fcntl(fd, libc::F_FULLFSYNC)
+        }
+        #[cfg(not(any(target_os = "macos", target_os = "ios")))]
+        unsafe fn os_fsync(fd: c_int) -> c_int { libc::fsync(fd) }
     }
 
     pub fn datasync(&self) -> io::Result<()> {