Write a C program where two child processes are created using fork().

Question

Write a C program where two child processes are created using fork(). The parent process and the two child processes communicate with each other via a pipe. More specifically, the first child process writes 5 random number in the range of 0-99 to the pipe, and the second child process also writes another 5 random number in the same range to the pipe. The order of which child process writes to the pipe does not matter and the 10 random numbers could be interleaved between the two child processes. The parent process reads out the 10 random numbers from the pipe and print them out on the display (terminal).

Answer 1

Here you go....

#include<stdio.h>

#include<stdlib.h>

#include<unistd.h>

int main() {

int pipefds[2];

int returnstatus;

int pid,pid1;

int readmessage[1];

returnstatus = pipe(pipefds);

if (returnstatus == -1) {

printf("Unable to create pipe\n");

return 1;

}

pid = fork();

// Child process

if (pid != 0){

pid1 = fork();

if (pid1 != 0) {

  for (int i =0;i<10;i++){

  read(pipefds[0],readmessage, sizeof(readmessage));

  printf("%d is the number read by parent\n",readmessage[0]);

  }}

else {

  for (int i =0; i<5;i++)

  {

  int rand_n = rand()%100;

  printf("Child Process 2 - Writing to pipe - Message 1 is %d\n", rand_n);

  write(pipefds[1], &rand_n, sizeof(rand_n));

  }  

  }

} else {

  for (int i =0; i<5;i++)

  {

  int rand_n = rand()%100;

  printf("Child Process 1- Writing to pipe - Message 1 is %d\n", rand_n);

  write(pipefds[1], &rand_n, sizeof(rand_n));

  }

}

return 0;

}