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arising later on (including overwriting the boundary of an array a situation that is examined later with respect to the GNU debugger, gdb). Next, we check that the number of horses is not greater than a typical field say, 24 horses. If the parameter passed on the command line is greater than 24, the program exits with a value of 1 the exit value of a program can be checked by a shell script, for example, to determine whether an application has failed. If all the parameters have been passed to the application as expected, the main body of the program can be executed. The random-number generator is seeded with the variable called seed, and the winning horse number is then randomly selected by using the formula supplied the numberOfHorses multiplied by the number returned by the rand() function, scaled appropriately by the RAND_MAX constant. Finally, the number of the winning horse is printed on standard output. This line-by-line explanation may seem long-winded, and it certainly won t teach you to be a C programmer. However, it does introduce the essential elements of a C program and highlights the evaluation of logical expressions at all points in an application, in order to carry out some specified task. Although the number and type of system calls on a Solaris system is very large (several hundred, in fact), they can all be accessed using the general approach used in developing this small application. To compile the program using gcc, use the following command:
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$ gcc horses.c -o horses -lm
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This command string compiles the source file horses.c, to produce the executable file horses, and forces the math library to be linked, so that any mathematical functions can be accessed at run time. If an application uses system calls, and the appropriate libraries are not linked in, the application will fail when executed. Let s see what happens when we execute the horses program, with a field of 12 horses and a seed value of 769:
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$ ./horses 12 769 Horses 1.0 This program picks a winning horse from a dynamic field size Number of horses: 12 Horse number 7 shall win the race
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This program suggests that horse number 7 shall win the horse race. However, if we supply a new random-number seed, we may receive a completely different prediction:
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bash-2.03# ./horses 12 768 Horses 1.0 This program picks a winning horse from a dynamic field size Number of horses: 12 Horse number 3 shall win the race
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We really shouldn t be basing our bets using the results computed by the program. In any case, we definitely don t want to take a bet on a field with many horses running, otherwise the odds of guessing the correct horse are way too high:
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bash-2.03# ./horses 1000 Horses 1.0 This program picks a winning horse from a dynamic field size Sorry - the maximum number of horses allowed in a race is 24
The random-number generator used in this demonstration is not really suitable for production use; you should consult the bible of numerical computing, which is Numerical Recipes. The source code, and many book chapters, are now freely available online at http://nr.harvard.edu/nr/nronline.html.
High-Level Input/Output
Solaris applications make extensive use of standard input and standard output streams, so that they can be executed on the command line. For example, the cat program displays the contents of files, which can then be piped through a filter (like more or grep) on the command line. Many Solaris scripts combine a number of small utilities to create complex applications. Understanding input and output streams is critical to developing utilities that can interoperate with existing Solaris applications. The specific functions for operating on standard input and standard output are defined in the <stdio.h> header file. The most commonly used input and output routines are these: fgetc fgets Reads a single character from a file Reads a string from a file Reads in a single character from standard input
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