map_file_from_path now passes the appropriate flags on to os.open instead of always calling it with os.O_RDWR. It will no longer try to open a file with write permissions if the user didn't request write access to the file mapping (or vice-versa).
core:os
Fix `local_tz_name` on FreeBSD.
err != 0
err != nil
Map_File_*
virtual.map_file