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- return better errors for file objects (also check read/write allowed, etc.)
- introduce more specific exceptions (e.g., zero divide, index failure, ...)
- why do reads from stdin fail when I suspend the process?
- introduce macros to set/inspect errno for syscalls, to support things
like getoserr()
- fix interrupt handling (interruptable system calls should call
intrcheck() to clear the interrupt status)
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