CS810D Advanced Programming in the UNIX Environment
Fall 2008
Quiz 3


FULL NAME                       ______________________________________


USERNAME                        ______________________________________



1)  Your process receives the signal SIGSTOP.  You can do the following:

A.  Catch it by providing a signal handler and perform some appropriate
    action.
B.  Cast it to SIGURG, so that a childs sigaction(2) can be invoked if
    necessary.
C.  Ignore the signal.
D.  All of the above.
E.  None of the above.


Correct answer:  E.  (You can catch or ignore SIGTSTP, but not SIGSTOP.)


2)  If process A calls fork, creating child process B, and process B then
calls fork again, creating child process C, and process C calls exec to
overlay itself with the new program image, in what order do the processes run
after the first fork call?

A. The order is A, B, C.
B. The order is C, B, A.
C. The order is B, A, C.
D. There is no fixed order.
E. All of the above.
F. None of the above.

Correct answer:  C.


3)  Process A forks, creating process B. Process A then exits, as does its
parent.  What will happen when Process B exits?

A. Process B will become a zombie.
B. Process A will become a zombie.
C. Process B will be reaped by process 1, init.
D. Process A will return from the zombie state.
E. All of the above.
F. None of the above.

Correct answer:  C.


4)  How does a socketpair differ from a pipe?
A.  A socketpair is bidirectional; a pipe is unidirectional.
B.  A pipe is full-duplex, whereas a socketpair is half-duplex.
C.  A socketpair preserves record boundaries, whereas a pipe is a stream
    file.
D.  There is no difference between a pipe and a socketpair.

Correct answer:  A.


5)  Name three possible ways of Interprocess Communication for two unrelated
processes on a single host.

Acceptable answers:
- fifos
- socketpair
- socket
- signals
- file I/O
- shared memory