Question

Write down a C program which creates a child process and prints a hello message from both the child and parent. Also, use the wait system call.

a) The correct code
b) Code with syntax errors
c) Incorrect code
d) Code for file input

Answer 1

To create a child process in C and print a hello message from both the child and parent, you can use the fork() function along with the wait() system call.

Step-by-step explanation:

To create a child process in C and print a hello message from both the child and parent, you can use the fork() function along with the wait() system call. Here is the code:

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/wait.h>

int main() {
pid_t pid;
int status;

pid = fork();
if(pid == 0) {
printf("Hello from Child!\\");
}
else if(pid > 0) {
wait(&status);
printf("Hello from Parent!\\");
}
else {
printf("Fork failed!\\");
}

return 0;
}

In this code, the fork() function is used to create a child process. The child process prints "Hello from Child!" and the parent process waits for the child to finish using the wait() system call and then prints "Hello from Parent!". The parent process waits for the child process to finish before printing its message.