15-213 Notes

213 reference sheet

Main

1. Why Systems Knowledge
2. Data Representation as Bits
3. Memory Layout
4. Assembly and Machine Programming
5. Data in Machine Programming
6. Machine Programming Vulnerabilities
7. Memory Hierarchy
8. Code Optimisation
9. Dynamic Memory Allocation
10. Linking
11. Virtual Memory
12. Processes
13. Shell
14. Exceptional Control Flow
15. System-level IO
16. Network Programming
17. Concurrent Programming

Misc

• Design and Debugging
• GDB
• printf directives
• Useful Systems Programming Commands

Misc 2

• volatile means not in register, not not in main memory
• Magic number - use of one number in one place magically make other code work or not work
• char payload[0] is zero length array but means flexible size
• offsetof(struct, member) is in C standard where compiler tells you offset to field in struct
• Technically gcc is not compiler. It launches the compiler
• static means it’s there but don’t tell other module
• telnet to test server. it just sends ascii