By M. Tim Jones
BSD Sockets Programming from a Multi-Language point of view is written for software program builders who have to create a number of community purposes. It starts off by way of detailing the effective and potent 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 a radical knowing of those matters and strategies is frequently the adaptation among being a amateur community software developer. Optimizing networked functions and warding off universal pitfalls also are addressed. After the forged foundational assurance of the Sockets API partially I, half II investigates it from quite a few language views. utilizing six assorted languages in all, together with significant languages (C), object-oriented languages (Java), and scripting languages (Perl), you study the benefits and drawbacks of every language as they relate to the advance of networked purposes and the Sockets API. eventually, partially III, a collection of software program styles is mentioned for every language. styles contain an easy HTTP server and SMTP patron, and numerous Sockets communique kinds (stream, datagram, multicast, and broadcast). those styles can be utilized because the foundation for extra advanced purposes or to offer you a quick-start while construction networked functions. The styles additionally remove darkness from the diversities among the community APIs for every language and determine how sure languages make styles easy and others cause them to complicated. The accompanying CD-ROM comprises all the resource code from the ebook, together with the styles distinct partly III, in addition to open resource interpreters and different instruments.
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Day Day Up > < Day Day Up > gethostname/sethostname Functions The gethostname function is a miscellaneous function that permits the application to identify the name of the host on which it executes. The function prototype for gethostname is defined as: "bold">gethostname( char *name, size_t len ); The caller provides a preallocated buffer pointer (of at least size 255) that the gethostname function uses to store the host name. The size of the buffer is provided as the len argument. 6. 6 Sample usage of the gethostname function.
5: Graphical progression of the connect function. Continuing at step (b), the connect function has been performed and the three-way handshake begins. Once the three-way handshake is complete, we continue to step (c) in which the connect function returns at the client and the accept function returns at the server. These two socket endpoints are now connected (otherwise known as an established connection) in step (c) and data communication may occur. < Day Day Up > < Day Day Up > Chapter 3: Standard BSD API Functions 35 36 Chapter 3: Standard BSD API Functions recv/recvfrom Function The recv and recvfrom functions are used to retrieve data that has been queued for a given socket.
Fd_set read_set, exc_set; int sock; int ret; ... 1, we enable a read event and an exception event for our socket (represented by sock) and then call select. Note that we specify the first argument as sock+1, because this must be exactly one greater than the largest socket descriptor that was loaded in the socket descriptor sets. Because we’re looking for read events and exception events, we pass in our read set structure as argument 2, and then our exception set as argument 4 (both as references, because the select function will modify these sets).