By M. Tim Jones

BSD Sockets Programming from a Multi-Language standpoint is written for software program builders who have to create a number of community purposes. It starts by means of 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 alternative is pointed out, together with the complex behavioral side-effects of every. Having a radical knowing of those concerns and methods is frequently the adaptation among being a amateur community program developer. Optimizing networked purposes and fending off universal pitfalls also are addressed. After the forged foundational assurance of the Sockets API partly I, half II investigates it from various language views. utilizing six various languages in all, together with central languages (C), object-oriented languages (Java), and scripting languages (Perl), you research 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 patron, and numerous Sockets verbal exchange types (stream, datagram, multicast, and broadcast). those styles can be utilized because the foundation for extra complicated functions 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 determine how yes languages make styles easy and others lead them to complicated. The accompanying CD-ROM comprises the entire resource code from the booklet, together with the styles certain partially III, in addition to open resource interpreters and different instruments.

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1: SOCKETS API FUNCTIONS DISCUSSED IN CHAPTER 3 Function Description socket Creates a new socket endpoint bind Binds a local address to the socket listen Permits incoming connections for a server socket accept Accepts a new client connection for a server socket connect Connects to a server from a client socket recv Receives data through a socket recvfrom Receives data through a datagram socket send Sends data through a socket sendto Sends data through a datagram socket close Closes a socket endpoint htons Converts short to network byte order ntohs Converts short to host byte order htonl Converts long to network byte order ntohl Converts long to host byte order inet_addr Converts a dotted-notation string to a 32-bit network address inet_ntoa Converts a 32-bit network address to a dottednotation string inet_aton Converts a dotted-notation string to a 32-bit network address The following subsections illustrate the API calls, and discuss any special characteristics of their application and common problems that are associated in their use.

This topic is explored in the next section. 2007 23:20:58] Client/Server Symmetry < Day Day Up > Client/Server Symmetry From our last example, it’s clear that for every client that performs a connect, a server performs an accept. When communication occurs, for every write, there’s a corresponding read of the communicated data (though the granularity of reads and writes may differ depending upon the specific protocol, more on this in Chapter 6, Advanced Sockets Programming Topics). The relationships shown by this symmetry are important because they illustrate how to build client and server Sockets applications.

Many times, this argument is specified as zero, because only one protocol exists for the given domain and type. When using specialized protocols (such as SCTP), we’ll see this argument used. 1. 1 Example usage of the socket function. 2007 23:21:00] socket Function ipSocket = socket( AF_INET, SOCK_RAW, IPPROTO_IP ); sctpSocket = socket( AF_INET, SOCK_STREAM, IPPROTO_SCTP ); sctpSocket = socket( AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP ); sctpSocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_SCTP ); rdmSocket = socket( AF_INET, SOCK_RDM, 0 ); Therefore, the socket function not only creates a new socket endpoint, but it also defines the semantics of communication that will be used through the socket.

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