patch 8.1.0957: Mac: fsync fails on network share commit https://github.com/vim/vim/commit/35856718881834a76225530d502c68fdec6584cf Author: Bram Moolenaar <Bram@vim.org> Date: Wed Feb 20 20:37:01 2019 +0100 patch 8.1.0957: Mac: fsync fails on network share Problem: Mac: fsync fails on network share. Solution: Check for ENOTSUP. (Yee Cheng Chin, closes https://github.com/vim/vim/issues/4016)

--- a/src/fileio.c
+++ b/src/fileio.c
@@ -5135,7 +5135,7 @@ vim_fsync(int fd)
 
 # ifdef MACOS_X
     r = fcntl(fd, F_FULLFSYNC);
-    if (r != 0 && errno == ENOTTY)
+    if (r != 0 && (errno == ENOTTY || errno == ENOTSUP))
 # endif
 	r = fsync(fd);
     return r;