• It is an IPC mechanism to notify a process of a particular event
• What is a conduit allowing two processes to communicate?
• What is the difference of half-duplex and full-duplex?
• What is an abstract indicator used for processing a file or other input/output resource?
• fork()를 하면 file descriptor도 child에게 복제된다 ( O / X )
• pipefd[0] pipefd[1]의 역할을 쓰시오