Write a program which creates a child process and the parent processwaits for the child process to exit after printing the process id of the child andparent process. (Use: fork, wait, getpid, getppid, exit System Calls)
Question
Write a program which creates a child process and the parent processwaits for the child process to exit after printing the process id of the child andparent process. (Use: fork, wait, getpid, getppid, exit System Calls)
Solution
Sure, here is a simple program in C that creates a child process and the parent process waits for the child process to exit after printing the process id of the child and parent process.
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
int main() {
pid_t pid, ppid, cpid;
// create child process
pid = fork();
if (pid < 0) {
printf("Fork failed.\n");
return 1;
}
// child process
if (pid == 0) {
cpid = getpid();
ppid = getppid();
printf("Child process ID: %d\n", cpid);
printf("Parent of child process ID: %d\n", ppid);
}
// parent process
else {
wait(NULL); // wait for child process to exit
printf("Parent process ID: %d\n", getpid());
}
return 0;
}
This program first creates a child process using the fork() system call. If the fork fails, it prints an error message and returns 1. If the fork is successful, the child process prints its process ID and the ID of its parent process. The parent process waits for the child process to exit using the wait(NULL) system call, then prints its own process ID.
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