Write a C program which creates a child process to find all txt files in the root directory (i.e., “P") and stores the output in a text file called “all_txt_files.txt". If the child process execution takes more than t seconds (measured at the parent), the parent should abort the execution of that child. Otherwise, after the child process termination, the parent has to create another child which will count the number of records in all_txt_files.txt and print out the output. The program should not allow the creation of orphan processes. - You need to include the C header file time.h to roughly count the execution time of the child process and play with different values of t so that both cases may happen. Another option may be the alarm system call. - You can use redirection (i.e., “>") to redirect the output of find to a txt file (e.g., find / -name "*. txt" > all_txt_files.txt). It's not a problem if find cannot access some directories. - You can count the number of lines in a txt file with the program wc. - You can still get points if you develop the program without the timer and abort functionalities. Examples of expected output: Aborted The child process execution took more than 3 seconds or 187853 txt files exist in the root directory
Write a C program which creates a child process to find all txt files in the root directory (i.e., “P") and stores the output in a text file called “all_txt_files.txt". If the child process execution takes more than t seconds (measured at the parent), the parent should abort the execution of that child. Otherwise, after the child process termination, the parent has to create another child which will count the number of records in all_txt_files.txt and print out the output. The program should not allow the creation of orphan processes. - You need to include the C header file time.h to roughly count the execution time of the child process and play with different values of t so that both cases may happen. Another option may be the alarm system call. - You can use redirection (i.e., “>") to redirect the output of find to a txt file (e.g., find / -name "*. txt" > all_txt_files.txt). It's not a problem if find cannot access some directories. - You can count the number of lines in a txt file with the program wc. - You can still get points if you develop the program without the timer and abort functionalities. Examples of expected output: Aborted The child process execution took more than 3 seconds or 187853 txt files exist in the root directory
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Write a C program which creates a child process to find all txt files in the root directory (i.e., “/")
and stores the output in a text file called “all_txt_files.txtť". If the child process execution takes more
than t seconds (measured at the parent), the parent should abort the execution of that child.
Otherwise, after the child process termination, the parent has to create another child which will
count the number of records in all_txt_files.txt and print out the output. The program should not
allow the creation of orphan processes.
- You need to include the C header file time.h to roughly count the execution time of the child
process and play with different values of t so that both cases may happen. Another option may be
the alarm system call.
- You can use redirection (i.e., “>") to redirect the output of find to a txt file (e.g., find / - name
"*. txt" > all_txt_files.txt). It's not a problem if find cannot access some directories.
- You can count the number of lines in a txt file with the program wc.
- You can still get points if you develop the program without the timer and abort functionalities.
Examples of expected output:
Aborted
The child process execution took more than 3 seconds
or
187853 txt files exist in the root directory
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