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Implement popen() and pclose(). Although these functions are simplified by not requiring the signal handling employed in the implementation of system() (Section 27.7), you will need to be careful to correctly bind the pipe ends to file streams in each process, and to ensure that all unused descriptors referring to the pipe ends are closed. Since children created by multiple calls to popen() may be running at one time, you will need to maintain a data structure that associates the file stream pointers allocated by popen() with the corresponding child process IDs. (If using an array for this purpose, the value returned by the fileno() function, which obtains the file descriptor corresponding to a file stream, can be used to index the array.) Obtaining the correct process ID from this structure will allow pclose() to select the child upon which to wait. This structure will also assist with the SUSv3 requirement that any still-open file streams created by earlier calls to popen() must be closed in the new child process.
The timestamp should be recorded in text form as the number of milliseconds since the start of the script session. Recording the timestamp in text form has the advantage that the resulting file is human-readable. Within string, real newline charac..
Describe and assess the evaluation method being used by the testing company, i.e., nonvisual and verbal recording of browser activities and tester's vocal comments.
Use Java 5 to create a generic class DrawingBox with a type parameter that simulates drawing an item at random out of a box. This class could be used for simulating a random drawing.
what is the improvement factor resulting from the use of the cache assuming that the LRU algorithm is used for block replacement?
Write a c program to draw an analog clock. Simulate the movement of needles.
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Explain the benefits and drawbacks of using software development tools provided by cloud vendors to develop cloud-based solutions for an organization.
The student will learn how to provide management for projects that employ the methods of data gathering, fact-finding and input/output design. Using case problems, students will implement the techniques of system development and project management.
Describe the model's strengths and weaknesses
Suppose that you will receive $100 in 4 years (end of year 4) and every even year thereafter (year 6, 8, ...) you will receive a payment that is 5% bigger than the prior payment. What is the present value of these payments assuming the discount ..
Write a method called wordLengths that accepts a Scanner for an input file as its parameters. Your method should open the given file, count the number of letters in each taken in the file, and output a result diagram of how many words contain each..
An adder is a device that adds the input signals to give an output signal equal to the sum of the inputs. Using the functions previously obtained in this section, write the function M-file for the signal in Figure 3.4.
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