Software Engineering (10th Edition)
10th Edition
ISBN: 9780133943030
Author: Ian Sommerville
Publisher: PEARSON
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Expert Solution & Answer
Chapter 16, Problem 16.1E
Explanation of Solution
‘provides’ interface:
It is the interface that defines the services that are provided by the component and also defines the methods that can be called by a user of the component.
‘requires’ interface:
It is the interface that defines the services that must be provided by other components in a system if a component operates correctly. If these are unavailable, then the component does not work.
Uses of ‘provides’ and ‘requires’:
- These interfaces are used in the component because the use of component is completely independent of its implementation.
- When the interfaces are not used in the component interactions, then the coupling between the components increases and it becomes difficult to interchange one component for an equivalent component with the same interface.
- A component should be independent so that it becomes easy to compose and deploy without specific components. But if the components are not independent then it requires ‘provides’ services externally and ‘requires’ interface explicitly.
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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
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3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
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3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
2. UNIX Shell and History Feature [20 points]
This question consists of designing a C program to serve as a shell interface that
accepts user commands and then executes each command in a separate process. A
shell interface gives the user a prompt, after which the next command is entered.
The example below illustrates the prompt osh> and the user's next command:
cat prog.c. The UNIX/Linux cat command displays the contents of the file
prog.c on the terminal using the UNIX/Linux cat command and your program
needs to do the same.
osh> cat prog.c
The above can be achieved by running your shell interface as a parent process.
Every time a command is entered, you create a child process by using fork(),
which then executes the user's command using one of the system calls in the
exec() family (as described in Chapter 3). A C program that provides the general
operations of a command-line shell can be seen below.
#include
#include
#define MAX LINE 80 /* The maximum length command */
{
int…
Chapter 16 Solutions
Software Engineering (10th Edition)
Ch. 16 - Prob. 16.1ECh. 16 - Prob. 16.2ECh. 16 - Prob. 16.3ECh. 16 - Prob. 16.4ECh. 16 - Using an example of a component that implements an...Ch. 16 - Prob. 16.6ECh. 16 - Prob. 16.7ECh. 16 - Using examples, illustrate the different types of...Ch. 16 - Prob. 16.9ECh. 16 - It has been suggested that an independent...
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