patch 8.1.0915: fsync() may not work properly on Mac commit https://github.com/vim/vim/commit/a787019518a540a7b4d0070f15467931b870ac89 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Feb 14 12:56:36 2019 +0100 patch 8.1.0915: fsync() may not work properly on Mac Problem: fsync() may not work properly on Mac. Solution: Use fcntl() with F_FULLFSYNC. (suggested by Justin M. Keyes)