Question

Using C, write a program that will create two child processes with one child process then using “pipe” to send “i love you” to another child process.

Answer 1

Program to pass value "I Love you" from one to another childProcess

#include<stdio.h>
#include<unistd.h>

int main() {
int pipefds[2];
int returnstatus;
int pid;
int pid2;
char writemessages[1][20]={"I Love You"};
char readmessage[20];
returnstatus = pipe(pipefds);
if (returnstatus == -1) {
printf("Unable to create pipe\n");
return 1;
}
pid = fork();
pid2 = fork();

// Child process-2
if (pid == 0) {
read(pipefds[0], readmessage, sizeof(readmessage));
printf("Child Process -2 - Reading from pipe – Message 1 is %s\n", readmessage);
} if(pid2 == 0) { // Child process-1
printf("Child Process- 1 - Writing to pipe - Message 1 is %s\n", writemessages[0]);
write(pipefds[1], writemessages[0], sizeof(writemessages[0]));
}
return 0;
}

Output:

Child Process- 1 - Writing to pipe - Message 1 is I Love You
Child Process -2 - Reading from pipe – Message 1 is I Love You