From 4d4c3bda75ad9d9a2b373bcd5a998a523d33679e Mon Sep 17 00:00:00 2001
From: Unrud <unrud@outlook.com>
Date: Thu, 3 Feb 2022 14:36:53 +0100
Subject: [PATCH] Fix F_FULLFSYNC on PyPy + Fallback if unsupported

---
 radicale/pathutils.py | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/radicale/pathutils.py b/radicale/pathutils.py
index 56e6fa0..ff4565e 100644
--- a/radicale/pathutils.py
+++ b/radicale/pathutils.py
@@ -88,6 +88,10 @@ if sys.platform == "linux":
             ctypes.c_uint]
         renameat2.restype = ctypes.c_int
 
+if sys.platform == "darwin":
+    # Definition missing in PyPy
+    F_FULLFSYNC: int = getattr(fcntl, "F_FULLFSYNC", 51)
+
 
 class RwLock:
     """A readers-Writer lock that locks a file."""
@@ -193,10 +197,15 @@ def rename_exchange(src: str, dst: str) -> None:
 
 
 def fsync(fd: int) -> None:
-    if sys.platform != "win32" and hasattr(fcntl, "F_FULLFSYNC"):
-        fcntl.fcntl(fd, fcntl.F_FULLFSYNC)
-    else:
-        os.fsync(fd)
+    if sys.platform == "darwin":
+        try:
+            fcntl.fcntl(fd, F_FULLFSYNC)
+            return
+        except OSError as e:
+            # Fallback if F_FULLFSYNC not supported by filesystem
+            if e.errno != errno.EINVAL:
+                raise
+    os.fsync(fd)
 
 
 def strip_path(path: str) -> str: