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need help with the following questions on os161 in C . thanks. 1- what is the system call number for a reboot? is this value

need help with the following questions on os161 in C . thanks.

1- what is the system call number for a reboot? is this value available to userspace programs ? why or why not.

2- what is the purpose of copying and copyout functions in copyinout.c? what do they protect against? where you want use them?

3- when do zombie threads finally get cleaned up?

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