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1. Use the template below to write a C-program that creates two processes: "Process A" (the process with whích the program starts execution) and "Process B" (A's child). The Process A forks Process B. To identify which process writes the output, each process puts its id at the beginning of each line (see the sample output). Each process performs the following operations. Process A: After spawning Process B, it waits for Process B to terminate. After Process B's termination, it will write your home directory (use HOME environment variable) and its process ID, and terminates. Process B: After being spawned from Process A, it sleeps for three seconds (using sleep0)- Then, it writes process IDs of itself and Process A immediately. After that, executes ps command (using system library) and terminates. Sample output: -fa.out 9181:1 am the parent, I will create child process 9182:1 am the child, I will sleep for 3 seconds 9182:My parent pid is 9181 9182:the ps command PID TTY TIME CMD 8931 pts/0 00:00:00 bash 9181 pts/0 00:00:00 a.out 9182 pts/0 00:00:00 a.out 9183 pts/0 00:00:00 ps 9181: My home directory is /home/user Template: 78 |Page #include #include /* contains fork prototype / main(void) int pid,status; //printf the first message //fork B process if (pid == 0) //child process // print message // sleep 3seconds // print message // print message // executes ps command printf("\n"); else // parent waits for child to finish // print message system("echo SHOME"); printf("\n"):

1. Use the template below to write a C-program that creates two processes: "Process A" (the process with whích the program starts execution) and "Process B" (A's child). The Process A forks Process B. To identify which process writes the output, each process puts its id at the beginning of each line (see the sample output). Each process performs the following operations. Process A: After spawning Process B, it waits for Process B to terminate. After Process B's termination, it will write your home directory (use HOME environment variable) and its process ID, and terminates. Process B: After being spawned from Process A, it sleeps for three seconds (using sleep0)- Then, it writes process IDs of itself and Process A immediately. After that, executes ps command (using system library) and terminates. Sample output: -fa.out 9181:1 am the parent, I will create child process 9182:1 am the child, I will sleep for 3 seconds 9182:My parent pid is 9181 9182:the ps command PID TTY TIME CMD 8931 pts/0 00:00:00 bash 9181 pts/0 00:00:00 a.out 9182 pts/0 00:00:00 a.out 9183 pts/0 00:00:00 ps 9181: My home directory is /home/user Template: 78 |Page #include #include /* contains fork prototype / main(void) int pid,status; //printf the first message //fork B process if (pid == 0) //child process // print message // sleep 3seconds // print message // print message // executes ps command printf("\n"); else // parent waits for child to finish // print message system("echo SHOME"); printf("\n"):

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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EXCERSICES 1. Use the template below to write a C-program that creates two processes: "Process A" (the process with which the program starts execution) and "Process B" (A's child). The Process A forks Process B. To identify which process writes the output, each process puts its id at the beginning of each line (see the sample output). Each process performs the following operations. Process A: After spawning Process B, it waits for Process B to terminate. After Process B's termination, it will write your home directory (use HOME environment variable) and its process ID, and terminates. Process B: After being spawned from Process A, it sleeps for three seconds (using sleep(). Then, it writes process IDs of itself and Process A immediately. After that, executes ps command (using system library) and terminates. Sample output: -/a.out 9181:1 am the parent, I will create child process 9182:1 am the child, I will sleep for 3 seconds 9182:My parent pid is 9181 9182:the ps command PID TTY TIME CMD 8931 pts/0 00:00:00 bash 9181 pts/0 00:00:00 a.out 9182 pts/0 00:00:00 a.out 9183 pts/0 00:00:00 ps 9181: My home directory is /home/user Template: 78 |Page #include <stdio.h> #include <unistd.h> /* contains fork prototype */ main(void) { int pid,status; //printf the first message //fork B process if (pid == 0) //child process { // print message // sleep 3seconds // print message // print message // executes ps command printf("\n"); } else // parent waits for child to finish // print message system("echo SHOME"); printf("\n");
Transcribed Image Text:EXCERSICES 1. Use the template below to write a C-program that creates two processes: "Process A" (the process with which the program starts execution) and "Process B" (A's child). The Process A forks Process B. To identify which process writes the output, each process puts its id at the beginning of each line (see the sample output). Each process performs the following operations. Process A: After spawning Process B, it waits for Process B to terminate. After Process B's termination, it will write your home directory (use HOME environment variable) and its process ID, and terminates. Process B: After being spawned from Process A, it sleeps for three seconds (using sleep(). Then, it writes process IDs of itself and Process A immediately. After that, executes ps command (using system library) and terminates. Sample output: -/a.out 9181:1 am the parent, I will create child process 9182:1 am the child, I will sleep for 3 seconds 9182:My parent pid is 9181 9182:the ps command PID TTY TIME CMD 8931 pts/0 00:00:00 bash 9181 pts/0 00:00:00 a.out 9182 pts/0 00:00:00 a.out 9183 pts/0 00:00:00 ps 9181: My home directory is /home/user Template: 78 |Page #include <stdio.h> #include <unistd.h> /* contains fork prototype */ main(void) { int pid,status; //printf the first message //fork B process if (pid == 0) //child process { // print message // sleep 3seconds // print message // print message // executes ps command printf("\n"); } else // parent waits for child to finish // print message system("echo SHOME"); printf("\n");
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