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

By M. Tim Jones

BSD Sockets Programming from a Multi-Language point of view is written for software program builders who have to create quite a few community functions. It starts off through 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 realizing of those concerns and methods is usually the adaptation among being a beginner community program developer. Optimizing networked purposes and heading off universal pitfalls also are addressed. After the cast foundational insurance of the Sockets API partially I, half II investigates it from various language views. utilizing six diverse languages in all, together with important languages (C), object-oriented languages (Java), and scripting languages (Perl), you research the benefits and drawbacks of every language as they relate to the advance of networked functions and the Sockets API. ultimately, partially III, a collection of software program styles is mentioned for every language. styles contain an easy HTTP server and SMTP consumer, and diverse Sockets verbal exchange types (stream, datagram, multicast, and broadcast). those styles can be utilized because the foundation for extra advanced purposes or to provide you a quick-start while construction networked functions. The styles additionally remove darkness from the diversities among the community APIs for every language and establish how definite languages make styles uncomplicated and others cause them to complicated. The accompanying CD-ROM contains all the resource code from the ebook, together with the styles certain partly III, in addition to open resource interpreters and different instruments.

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4). If the queue is empty, the accept function blocks, unless the server socket was previously defined as nonblocking. 4: Graphical depiction of the accept function. When a new connection is queued in the accepted connection queue, the accept function unblocks and returns the new socket to the caller. Sockets on the accepted connection queue are returned in First In, First Out (FIFO) order. The calling application provides a server socket for which the listen function was previously invoked. The caller also provides a sockaddr_in structure (because we’re operating within the AF_INET domain) and an int pointer (socklen_t) that identifies the size of the returned addr structure.

The server then must use the accept call to accept incoming client connections, which are represented by a newly created socket representing the new endpoint. For a client to connect to the server, it must also create a socket. Additionally, we must define for the socket what we want to connect to. This is defined in the sockaddr_in structure. Then, by using the connect call, we cause the three-way handshake to occur between the client and server, using in this case TCP. Note the relationships between connect and accept.

Sin_port = htons(DAYTIME_SERVER_PORT); bind(serverFd, (struct sockaddr *)&servaddr, sizeof(servaddr)); listen(serverFd, 5); while ( 1 ) { connectionFd = accept(serverFd, (struct sockaddr *)NULL, NULL); if (connectionFd >= 0) { currentTime = time(NULL); snprintf(timebuffer, MAX_BUFFER, "%s\n", ctime(¤tTime)); write(connectionFd, timebuffer, strlen(timebuffer)); close(connectionFd); } } } At this point, we have a socket server configured and ready for incoming connections. The remainder of the program handles incoming connections and processes them based upon the Daytime protocol.

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