2.7 I/O System OverviewThe basic model of the UNIX I/O system is a sequence of bytes that can be accessed either randomly or sequentially. There are no access methods and no control blocks in a typical UNIX user process. Different programs expect various levels of structure, but the kernel does not impose structure on I/O. For instance, the convention for text files is lines of ASCII characters ..

9. main memory - memory management 목표 – provide a convenient abstraction for programming (인터페이스) - Batch programming – program이 직접 physical address를 사용한다. - process 하나만 있던 시절에는 상관 없었음 -> multiple process – 메모리 관리의 필요성 발생 - 문제점 1) multiple process 2) 메인 메모리보다 큰 프로세스 (ex) 게임) -> Virtual memory 등장 : process 내부에서는 virtual, logical address 사용, 실제 RAM의 주소는 physical address - secondary storage, memory를..