patch 8.0.1335: writefile() using fsync() may give an error. commit https://github.com/vim/vim/commit/291a9d15ed1eb1094edc8ad6dda00a6da3bd7072 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Nov 25 14:37:11 2017 +0100 patch 8.0.1335: writefile() using fsync() may give an error. Problem: Writefile() using fsync() may give an error for a device. (Yasuhiro Matsumoto) Solution: Ignore fsync() failing. (closes #2373)

--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -13449,8 +13449,10 @@ f_writefile(typval_T *argvars, typval_T 
 	if (write_list(fd, list, binary) == FAIL)
 	    ret = -1;
 #ifdef HAVE_FSYNC
-	else if (do_fsync && fsync(fileno(fd)) != 0)
-	    EMSG(_(e_fsync));
+	else if (do_fsync)
+	    /* Ignore the error, the user wouldn't know what to do about it.
+	     * May happen for a device. */
+	    ignored = fsync(fileno(fd));
 #endif
 	fclose(fd);
     }