Notes
Lecture 11
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Midterm review
- Assignment 2 solutions
- Assignment 1 solutions
- key concepts
Class will end at 11
- I have to run to the airport!
Most system calls (that would be used in a regular program) have a corresponding library call (that is a thin wrapper around the system call)
- so if you see it in strace there's probably a way of calling it
C library functions are pretty cross-platform
- but they are very closely associated with UNIX
Remember that printf goes to standard out
equivalent to fprint(stdout, ...)
So fprint(stderr, ...) is going to a different place
- just normally in a terminal 1 and 2 are going to the terminal
(standard out and standard error)
I don't expect your solutions to be identical to mine
- you just need to answer the question in a way that shows you understand the key concepts
- there are multiple valid solutions to many of the questions,
but they differ in implementation strategy, not in an
understanding of what is going on
Kill vs signal
- kill is for sending signals
- signal is for receiving signals
- not quite standardized, so nowadays
you're supposed to use sigaction, not signal
The C library defines standard signal handlers for all signals
- most just terminate the process
Submissions for the midterm will be exactly like the assignments
- submit a text file
- auto grading isn't possible, as it will almost all be short answer
Officially 80 minutes
- don't submit multiple times
- if there are problems, just email your answers to me or
send them via Teams
If you did the tutorials correctly, the assignments should be pretty straightforward
- so if you found the assignment to be very hard,
rethink how you do tutorials
Questions during the midterm
- teams
- open zoom (office hours)
- info will be on midterm PDF
Remember redirecting standard error for a command doesn't change standard error for the main shell