help with signals (ultrix)

[Charles Shub]

on at&t unix if a system call to (eg) read is in progress when a signal
occurs, the system call fails. On sun unix and ultrix, the system call
restarts. On the sun, one can use siginterrupt(3) to make the system call
fail. How do I make the system call fail under ultrix???????
we are running 1.2 on microvaxen.
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