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 functions. It starts through detailing the effective and potent makes use of of the BSD Sockets API for networked software improvement in a number of languages. From there the BSD API is roofed intimately and the aim of every functionality and socket choice is pointed out, together with the complicated behavioral side-effects of every. Having a radical figuring out of those concerns and methods is frequently the variation among being a beginner community program developer. Optimizing networked functions and averting 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 study the benefits and downsides of every language as they relate to the advance of networked functions and the Sockets API. eventually, partially III, a suite of software program styles is mentioned for every language. styles contain an easy HTTP server and SMTP buyer, and diverse Sockets verbal exchange 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 yes languages make styles basic and others lead them to advanced. The accompanying CD-ROM contains all the resource code from the ebook, together with the styles special partially III, in addition to open resource interpreters and different instruments.
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Extra resources for BSD Sockets Programming from a Multi-Language Perspective
The recv function returns either the number of bytes received from the socket, or a –1 if an error occurred. The socket from which data is desired is passed as the first argument (sock), followed by a buffer argument called buf into which the recv function will copy the socket data. The amount of data requested (which must be at least the size in bytes of the preallocated buf argument) is provided next as the len argument. 3). 3: MOST COMMON FLAGS FOR THE recv/recvfrom FUNCTIONS Flag MSG_OOB MSG_PEEK MSG_WAITALL Description Requests out-of-band data from the socket Returns data, but doesn’t consume Requests blocking call until all requested data is returned MSG_OOB refers to the request of out-of-band data through the socket.
Within the Transport layer, the send buffer is consumed and sent in a manner consistent with the particular transport protocol. Another item of interest is that local errors are detected, but there is no immediate indication that the peer socket received the data. Let’s now look at a couple of examples. 9). 8 Example of the send function with a stream socket. 8) demonstrates the typical setup of a stream socket, along with defining a server address (through a sockaddr_in structure) and then connecting to it.
1”) will be refused. 1: Binding a specific address to a server socket. 2, we see another server bind function example. This example is the more traditional use of the bind function in which all interfaces are permitted for incoming connections to the server application. This functionality is configured using the INADDR_ANY symbolic constant, which represents the wildcard address (all available interfaces). In this example, clients can connect to the server application through either interface; neither will refuse connections.
BSD Sockets Programming from a Multi-Language Perspective by M. Tim Jones