System Calls Part II

Objectives

1. Understand system calls.

Notes

• This is 2.3 in the book, you should read it
• Figure on page 65 shows how we jump to kernel mode when handling a system call.
• 2.3.3 Discusses types of system calls
  • Process control
    • Creation, exit
    • set attributes
    • Send signals
  • File management
    • open, close, read, write,....
  • Device management
    • open, close, read, write,....
    • Interesting, on linux/unix everything is a file!
  • Information maintenance
    • get/set time, date ,...
    • Get/set file/process attributes
  • Communications
    • Send/receive messages
    • Create connections
  • Protections
    • get/set permissions
  • The box on page 68 shows some windows and linux system calls.
• They mention that calls like cout << "hello world";
  • Invoke at least one, and possibly more system calls.
  • This is pictured on page 69
• Under process control, they discuss creating a new process.
  • Not quite sure why, but newProc.cpp demos this.