Computer Science 322
Operating Systems

Lecture 16: Unix Systems Programming
Date: Monday, March 24, 2008

Announcements
- Grading updates
- Round robin CPU scheduler simulation grading: come see me to demonstrate your code
Lecture assignment recap
Lab 5 Out
- you can get started right away on the basic framework
- we'll discuss the needed system calls, hopefully by Wednesday, definitely by Friday
SysV Semaphores wrapup
Unix Systems Programming
- Error checking and reporting
  - always check return values of system calls!
  - errno variable
  - perror(3), strerror(3)
- Process management
  - PID queries: getpid(2), getppid(2)
  - Process creation: fork(2), vfork(2)
  - Process termination: exit(3), _exit(2)
  - Parent notification: wait(2), waitpid(2)
- Starting new programs - exec system calls
  - To fork(2) anything but a copy of yourself...
  - execl(3), execv(3), execlp(3), execvp(3)
  - varags vs. arrays, search path or not?

No new lecture assignment for Wednesday.