In-class notes for 09/09/2019 (CS 273 (OS), Fall 2019)

In-class notes for 09/09/2019

CS 273 (OS), Fall 2019

stogit
./ executables
Homework assignment HW1 - submit by "midnight" (anywhere on earth)

Questions on homework? Piazza?
Upcoming homework assignment HW2, due Wednesday
Environment (third argument for main()...)

Reading questions?

Some basic file system calls (highlights)

open(), read(), write(), close()
- Can open for read-only, write-only, read or write
  
  OS creates an internal data structure for each open file
  User and System parts of a process
- file descriptor (relationship to open-file data structure)
- lseek() - change current position in file
- ~rab/os/egs/mopen filename [-r|-w|-rw] ...
- man open
  - Section 2; call syntax; O_READ, O_WRITE, O_APPEND
  - O_APPEND warning
- Source code mopen.c
  - How to call a system call - read(), write(); try_open()
File properties

mode bits; protection domains; umask
Directory operations

(hard) links; symbolic links; unlinking; default directory

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