Question: What happens to an in-progress system call when a process receives a signal? (An example is a program waiting for input from a terminal with

What happens to an in-progress system call when a process receives a signal? (An example is a program waiting for input from a terminal with a blocking read call.) What does "restarting" a system call have to do with this?

Describe how you could add input redirection for external programs to 3000shell.

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