System Calls and unistd.h

Announcements

• Homework 10 due Monday

• Final exam: 7-10pm April 30, Gilmer 301 (different room!)

  • Cumulative, see practice tests

  • Exam conflict form in email

Processes

Process - approximately what we think of as a “running program"

• Operating System effectively has a giant array of processes started since computer turned on

• Try ps -A

• Has access to all memory (but only its own!)

• Operating System maintains data structure about each process

  • What program is running, who ran it, when it started, ...

  • Array of “file like objects"

Processes

Using write

Using write

Using write