patch 8.0.1300: file permissions may end up wrong when writing commit https://github.com/vim/vim/commit/cd142e3369db8888163a511dbe9907bcd138829c Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 16 17:03:45 2017 +0100 patch 8.0.1300: file permissions may end up wrong when writing Problem: File permissions may end up wrong when writing. Solution: Use fchmod() instead of chmod() when possible. Don't truncate until we know we can change the file.

--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -36,6 +36,7 @@ int mch_isFullName(char_u *fname);
 void fname_case(char_u *name, int len);
 long mch_getperm(char_u *name);
 int mch_setperm(char_u *name, long perm);
+int mch_fsetperm(int fd, long perm);
 void mch_copy_sec(char_u *from_file, char_u *to_file);
 vim_acl_T mch_get_acl(char_u *fname);
 void mch_set_acl(char_u *fname, vim_acl_T aclent);