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Now that the user's command has been parsed into an array of char*, we can pass this to the OS to execute the command. To execute the command, use the execvp() function from unistd.h. You will pass your command array to this function which will execute the command. Remember that if this function executes properly, it will terminate the current process; so, it should be executed in a child process. The child process can be created with the fork() function which is also in unistd.h. While the child process is executing the command, the parent process should wait for the child to finish executing. This is done by using the waitpid() function which can be found in sys/wait.h. As you are waiting on the child process, you will want to make this call blocking. You can do this by giving the WUNTRACED option to the waitpid() call which is defined in sys/types.h. Remember that if the execvp() function does not complete successfully, the child process will not end. As this will only happen when an error occurs, this would be a good place to print the error message. This can be done easily by calling the perror(NULL) function. Then be sure to end the child process by calling the exit() function. Once the command is done, you should print your prompt on a new line.
The excess-3 code of decimal 7 is represented by ? Ans. An excess 3 code of decimal 7 is equal to the binary code +3.
What is a Multiplexer Tree? Ans Multiplexer Tree: The largest available MUX IC is 16 to 1. Meeting the larger input requires there must be a provision to expand this. It
A session is a logical object formed by the PHP engine to permit you to preserve data across subsequent HTTP requests. There is only one session object available to your PHP scr
What is Function scope Function scope: A label is the only part of identifier that has function scope. A label is declared implicitly by its use in a statement. Label names m
The difference among the next and continue verb is that in the continue verb it is used for a situation where there is no EOF condition that is the records are to be accessed again
What is overflow, underflow case in single precision(sp)? Underflow-In SP it means that the normalized representation needs an exponent less than -126. Overflow-In SP it mea
what is the usuage of Real time Os
Explain how a critical section avoids Race condition. To prevent Race Condition, concurrent processes should be synchronized. Data consistency needs that only one process m
After going through details of device interfaces next point to be discussed is how the interface can be used to support I/O from devices. Binary information received from an extern
Illustrate the Examples of simulations - Training (for example pilots, drivers, etc.) - Running/testing nuclear plants and chemical plants - trying out equipment to be
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