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If a service request is unsuccessful for some reason, the domain attempting to carry out the service indicates the lack of success by sending a negative acknowledgment message This negative acknowledgment message contains an error value that provides an explanation as to what the problem was An example of a negatively acknowledged service request is illustrated in Figure 6-28

Page 258 printf("Enter a string: "); gets(str); printf(str); return 0; }

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Assume that this program is called TEST If you execute TEST normally, it displays its prompt on the screen, reads a string from the keyboard, and displays that string on the screen However, in an environment that supports I/O redirection, either stdin , stdout, or both could be redirected to a file For example, in a DOS or Windows environment, executing TEST like this,

6-14

causes the output of TEST to be written to a file called OUTPUT Executing TEST like this,

Then convert them to dotted decimal:

directs stdin to the file called INPUT and sends output to the file called OUTPUT When a C program terminates, any redirected streams are reset to their default status Using freopen( ) to Redirect the Standard Streams

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Service initiated The service initiated event in this flow is optional If no prompting of the device is required, the newly created connection could go directly to the connected state because single-step dialing was being used (ie, the complete called device address was provided as a parameter to the consultation call service)

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FILE *freopen(const char *filename, const char *mode, FILE *stream); where filename is a pointer to the filename you want associated with the stream pointed to by stream The file is opened using the value of mode, which may have the same values as those used with fopen( ) freopen( ) returns stream if successful or NULL on failure

A positive acknowledgment indicates that a service request is being or has been acted upon There are two basic types of positive acknowledgments, depending on the nature of the service request: One type of service request is a direct request for the CTI interface to return information about something in the switching domain In this case, the positive acknowledgment not only indicates that the request was completed successfully, it also includes the requested information If the service request involved requesting that some manipulation of resources take place, the positive acknowledgment indicates that the CTI interface has passed the request to call processing to be carried out If the service in question is carried out in an atomic fashion, the positive acknowledgment also indicates notification that the service was completed successfully An example of a positively acknowledged service request is illustrated in Figure 6-29 The service request in this example is a request for information The definition of a positive acknowledgment message for a given service may include mandatory, optional, and conditionally mandatory parameters

You can redirect the standard streams by using the freopen( ) function This function associates an existing stream with a new file Thus, you can use it to associate a standard stream with a new file Its prototype is

Get used to the idea of subnet masks that use more than 255s and 0s Here are some examples of perfectly legitimate subnet masks Try converting these to binary to see for yourself

The following program uses freopen( ) to redirect stdout to a file called OUTPUT:

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The implementation of services in the switching domain may be atomic or multi-step The nature of the implementation determines the correct interpretation of positive and negative acknowledgment messages If a particular service is implemented in an atomic fashion, the switching domain treats requests for it as follows: 1 Validation Are all of the parameters valid Are all applicable connections in the correct states Are all necessary resources available If the service request is invalid for any reason, the switching domain sends back a negative acknowledgment message to indicate that the request has failed 2 Execution The switching domain then attempts to carry out the service requested 3 Acknowledgment of success or failure If the service request succeeded, the switching domain sends a positive acknowledgment message to indicate it has succeeded Otherwise it sends a negative acknowledgment, indicating that the service did not succeed and why it did not

#include <stdioh> int main(void) { char str[80]; freopen("OUTPUT", "w", stdout); printf("Enter a string: "); gets(str); printf(str); return 0; }

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