Which of the following is correct for the standard file descriptors that are automatically opened in UNIX?

When a new process is created using fork(), which of the following describes the state of open file descriptors?

An orphan process occurs as a result of which of the following conditions?

Race conditions are caused by which of the following conditions in a multi threaded system?

You want to listen on a port for some user-defined data stream. Would you use port 80?

The purpose of the poll() and select() system calls is to perform which of the following functions?

Which types are not allowed within an enum variant's body?

What smart pointer is used to allow multiple ownership of a value in various threads?

Which statement about the Clone and Copy traits is false?

When used as a return type, which Rust type plays a similar role to Python's None, JavaScript's null, or the void type in C/C++?

Which statement about lifetimes is false?