3.7 Resource ServicesAll systems have limits imposed by their hardware architecture and configuration to ensure reasonable operation and to keep users from accidentally (or maliciously) creating resource shortages. (오오.. 모든 시스템은 한계를 가진다 by 안정성)At a minimum, the hardware limits must be imposed on processes that run on the system. It is usually desirable to limit processes further, below these har..

2.12 Interprocess CommunicationInterprocess communication in FreeBSD is organized in communication domains. The most important domains currently supported include the local domain, for communication between processes executing on the same machine; the IPv4 domain, for communication between processes using the TCP/IP protocol suite (version 4); and the IPv6 domain, which is the newest version of ..

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 ..

Network Socket Network Socket is an internal endpoint for sending or receiving data within a node on a computer network. a representation of this endpoint in networking software (protocol stack) such as an entry in a table (listing communication protocol, destination, status, etc.), and is a form of system resource. 4계층을 깔고, Application 이야기한다. IP 주소 + 포트 번호 -> socket address 4계층과 3계층은 운영체제 안에 있다..

Process-to-Process Delivery The data link layer is responsible for delivery of frames between two neighboring nodes over a link. This is called node-to-node delivery. -> 서로 다른 계층, ex) 1 - 2 계층 간 주고 받을 때 The network layer is responsible for delivery of datagram between two hosts. This is called host-to-host delivery. -> 동일한 계층끼리 주고받을 때 (host) 앞서 살펴본 1,2 그리고 3 계층 이야기 The transport layer is respons..