Similar but traps are triggered automatically on attempts to execute a protected instruction.

https://www.geeksforgeeks.org/operating-systems/traps-and-sy...

Before SYSCALL there was INT

if you know a particular process or system callmakes errors,then you run code that checks for that error,or exception,or preempively hooks a problematic system call,to redirect to "your"code that handles the state of exception,and returns.

https://en.wikipedia.org/wiki/Interrupt#Terminology

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