Fle operation commands: mkdir, rmdir, cd, pwd, chmod Write down syscall function for each: ______ _____ _____ _____ _______ Chapter 8: System calls: stat and ls program: u16 st_mode: How to tell a file is REGular ? ______________________________ DIRectory? ______________________________ LNKfile ? ______________________________ u32 st_ctime = 12345678: what does the value mean? ________________________________________ How to convert st_ctime into CALENDAR form?_______________________ Write C code to print all the file names under Current Directory: