interrupts

[Tim Kinman]

I would like to implement an alarm utility within my application
but I am concerned about the side effects it will have on my existing code.

It is my understanding that reads from a terminal, wait, and pause will return 
an error condition when they are interrupted by an alarm.

I have several questions...

1. Are these the only system functions that will not resume where they left off
   after the interrupt is complete?

2. Is this true on all flavors of UNIX? I recently heard that this is not a 
   problem on System V.