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Back in the old days there was an operating system called Novell NetWare Novell NetWare servers were true dedicated servers You couldn t go up to a Novell NetWare server and write yourself a resume; there was no Windows, there were no user applications The only thing Novell NetWare servers knew how to do was share their own resources, but they shared those resources extremely well! The Novell NetWare operating system was unique It wasn t Windows, Macintosh, or Linux It required you to learn an entirely different set of installation, configuration, and administration commands Figure 12-4 shows a screen from Novell NetWare Don t let the passing resemblance to Windows fool you it was a completely different operating system! Dedicated servers enabled Novell to create an entire feature set not seen before on personal computers Each dedicated server had its own database of user names and passwords You couldn t access any of the resources on the server without logging in The server s administrator would assign permissions to a specific user account, such as Write (add files to a directory), File Scan (see the contents of a directory), and Erase (delete files) By keeping the server functionality separate from the client systems, the Novell folks made very powerful, dedicated servers without overwhelming the client computers with tons of software (This was, after all, in the early days of personal computers and they didn t have anything near the power of a modern PC!) NetWare servers had tremendous power and great security because the only thing they did was run serving software In the early days of networking, client/server was king!

The setvbuf( ) function allows the programmer to specify a buffer, its size, and its mode for the specified stream The character array pointed to by buf is used as the buffer for I/O operations on stream The size of the buffer is set by size, and mode determines how buffering will be handled If buf is null, setvbuf( ) will allocate its own buffer In C99, stream and buf are qualified by restrict

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The legal values of mode are _IOFBF, _IONBF , and _IOLBF These are defined in <stdioh> When mode is set to _IOFBF, full buffering will take place If mode is _IOLBF, the stream will be line buffered For output streams, this means that the buffer will be flushed each time a newline character is written The buffer is also flushed when full For input streams, input is buffered until a newline is read If mode is _IONBF, no buffering takes place The setvbuf( ) function returns zero on success, nonzero on failure Example This code fragment sets the stream fp to line-buffered mode with a buffer size of 128:

Novell NetWare was the first popular way to network PCs, but it wasn t too many years later that Microsoft introduced the first versions of network-capable Windows The way in which these versions of Windows looked at networking, called peer-to-peer, was completely different from the client/server view of networking In a peer-to-peer network, any system acts as a server, a client, or both, depending on how you configure that system PCs on peer-to-peer networks frequently act as both clients and servers One of the most common examples of a peer-to-peer network is the venerable Windows 9x series of operating systems Figure 12-5 shows the sharing options for the ancient Windows 98 operating system, providing options to share a folder and thus turn that computer into a server At first glance, it would seem that peer-to-peer is the way to go why create a network that doesn t allow the clients to see each other Wouldn t it make more sense to give users the freedom to allow their systems both to share and access any resource The problem was a lack of security

#include <stdioh> char buffer[128]; setvbuf(fp, buffer, _IOLBF, 128);

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The early Windows systems did not have user accounts and the only permissions were Read Only and Full Control So they made it easy to share, but hard to control access to the shared resources People wanted the freedom of peer-to-peer with the security of client/server EXAM TIP The old school client/server model means dedicated servers with strong security Clients only see the server In the peer-to-peer model, any system is a client, server, or both, but at the cost of lower security and additional demands on the system resources of each peer

#include <stdioh> int snprintf(char * restrict buf, size_t num, const char * restrict format, )

The snprintf( ) function was added by C99 The snprintf( ) function is identical to sprintf( ) except that a maximum of num characters will 1 be stored into the array pointed to by buf On completion, this array is null terminated Thus, snprintf( ) allows you to prevent buf from being overrun Related Functions printf( ), sprintf( ), and fsprintf( )

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