socket() • int socket(int domain, int type, int protocol); • The domain specifies what type of socket we want—for this lecture, it will be one of PF_INET or PF_INET6 • The type for this lecture will always be SOCK_STREAM (meaning TCP, it could also be SOCK_DGRAM for UDP) • The protocol is the protocol number (e.g., one of IPPROTO_TCP or

These examples illustrate the most common types of socket programs that use the most basic design, which can be a basis for more complex socket designs.

Apr 23, 2025 · Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while the other socket reaches out to the other to form a connection.

In this Lab you will be introduced to socket programming at a very elementary level. Specifically, we will focus on TCP socket connections which are a fundamental part of socket programming since they provide a connection oriented service with both flow and congestion control.

can use so-called dual-bind feature (with care, Linux-only) portable solution is to use 2 separate sockets. [1] Martin Duke, Robert T. Braden, Wesley Eddy, Ethan Blanton, and Alexander Zimmermann. A Roadmap for Transmission Control Protocol (TCP) Speci cation Documents. RFC 7414, February 2015.

CS 50 Software Design and Implementation Lecture 19 Socket Programming. How do we build Internet applications? In this lecture, we will discuss the socket API and support for TCP communications between end hosts. Socket programing is the key API for programming distributed applications on the Internet. Note, we do not cover the UDP API in the ...

As shown in Figure 2.28, the socket is the door between the application process and TCP. The application developer has control of everything on the application-layer side of the socket; however, it has little control of the transport-layer side.

Socket API • API (Application Programming Interface) • Provides a standard set of functions that can be called by applications • Berkeley UNIX Sockets API • Abstraction for applications to send & receive data • Applications create sockets that “plug into” network • Applications write/read to/from sockets • Implemented in the ...

Sockets and TCP/IP • In TCP/IP: – Endpoint has unique (TCP port, IP address) pair – Connecon between two endpoints is idenfied by the pair [(IP, port) src, (IP, port) dst] • All Unix I/O streams are referenced by descriptors – Socket maps a descriptor to

What is a socket? A socket is an abstract representation of a communication endpoint. Sockets work with Unix I/O services just like files, pipes & FIFOs. Treat me as a file, please! Dest. SOCK_DGRAM? NOTE: socket call does not specify where data will be coming from, nor where it will be going to – it just creates the interface!