By M. Tim Jones
BSD Sockets Programming from a Multi-Language standpoint is written for software program builders who have to create various community purposes. It starts via 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 complex behavioral side-effects of every. Having an intensive knowing of those matters and methods is usually the variation among being a amateur community program developer. Optimizing networked functions and warding off universal pitfalls also are addressed. After the cast foundational assurance of the Sockets API partly I, half II investigates it from various language views. utilizing six diverse languages in all, together with principal languages (C), object-oriented languages (Java), and scripting languages (Perl), you examine the benefits and drawbacks of every language as they relate to the improvement 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 customer, and numerous Sockets conversation kinds (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 purposes. The styles additionally light up the variations among the community APIs for every language and determine how sure languages make styles uncomplicated and others cause them to complicated. The accompanying CD-ROM contains all the resource code from the publication, together with the styles special partly III, in addition to open resource interpreters and different instruments.
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Additional resources for BSD Sockets Programming from a Multi-Language Perspective
1, we see an example in which we bind our server to a specific interface using the bind function. 1, what is interesting is the use of an IP address to define the address structure’s sin_addr element. 1). Once the bind is performed with this address, incoming connections will occur only through this interface. 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.
For a client socket, outgoing connections are permitted through any interface. s_addr of zero would provide this functionality. < Day Day Up > < Day Day Up > listen Function The listen function is used for stream sockets to mark a socket as willing to accept incoming connections. This function may only be called for sockets initially created of type SOCK_STREAM or SOCK_SEQPACKET. The listen function has the following prototype: "bold">listen( int sock, int backlog ); The sock argument is a previously created socket (of the previously defined type) and backlog represents the size of the queue that will hold accepted connections.
3 Example of the bind function for a server socket. s_addr = inet_addr( INADDR_ANY ); bind( servsock, (struct sockaddr_in *)&servaddr, sizeof(servaddr) ); Note that if the sin_port had been defined as zero, the bind function would automatically assign an ephemeral (dynamic) port to it. This is a common method for client sockets, but server sockets typically require a known port number and, therefore, define one statically. 30 Chapter 3: Standard BSD API Functions Chapter 3: Standard BSD API Functions 31 Let’s now look at what the bind function actually does from an interface perspective for both a client and a server.
BSD Sockets Programming from a Multi-Language Perspective by M. Tim Jones