BSD Sockets Programming from a Multi-Language Perspective by M. Tim Jones

By M. Tim Jones

BSD Sockets Programming from a Multi-Language viewpoint is written for software program builders who have to create various community functions. It starts off via detailing the effective and powerful makes use of of the BSD Sockets API for networked program improvement in a number of languages. From there the BSD API is roofed intimately and the aim of every functionality and socket alternative is pointed out, together with the complicated behavioral side-effects of every. Having an intensive knowing of those concerns and strategies is usually the adaptation among being a beginner community program developer. Optimizing networked functions and heading off universal pitfalls also are addressed. After the forged foundational insurance of the Sockets API partially I, half II investigates it from various language views. utilizing six assorted languages in all, together with important languages (C), object-oriented languages (Java), and scripting languages (Perl), you examine the benefits and downsides of every language as they relate to the advance of networked purposes and the Sockets API. ultimately, partially III, a suite of software program styles is mentioned for every language. styles contain an easy HTTP server and SMTP purchaser, and diverse Sockets verbal exchange types (stream, datagram, multicast, and broadcast). those styles can be utilized because the foundation for extra complicated purposes or to offer you a quick-start whilst construction networked functions. The styles additionally light up the diversities among the community APIs for every language and establish how convinced languages make styles uncomplicated and others cause them to advanced. The accompanying CD-ROM comprises all the resource code from the e-book, together with the styles certain partially III, in addition to open resource interpreters and different instruments.

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As each socket is created, a different interface address is bound to the client socket. In this way, the number of sockets created are bound to a separate interface and, therefore, are shared among the available interfaces. One final item to note is the effect of calling the bind function with incomplete information in the address structure. If the port number is set to zero in the sockaddr_in structure (sin_port), the bind function automatically assigns an ephemeral port to the socket. s_addr field is set to zero, then this has the same effect as the wildcard address (INADDR_ANY is zero on most systems).

Out-of-band data, otherwise known as expedited data, permits an application to communicate data with higher priority to the peer. MSG_PEEK allows an application to preview the data that’s available in the socket buffer to read, without actually consuming it at the Sockets layer. This means that an application must at some point read the data without specifying the MSG_PEEK flag to remove it from the Sockets buffer. Finally, the MSG_WAITALL flag tells the Sockets layer to block on the recv and recvfrom call until the specified number of bytes is available to read.

Addressing If we use standard communication analogies to define the two socket types, we can define a stream connection as a telephone call and a datagram connection as postcard communication. 2007 23:20:56] Chapter 2: Introduction to Sockets Programming to set up the channel to communicate (in this case, dial the number and await the receiver to pick up the phone). Once the receiver answers, we can communicate on a one-to-one basis in a stream fashion. Datagram communication allows us to define addressing information for each message we send.

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