OS4

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main() {
pid_t child_pid = fork();
if (child_pid == 0) {
printf("Child process (PID: %d) is running, and its parent (PPID: %d) has terminated.\n", getpid(), getppid());
sleep(5);
printf("Child process (PID: %d) has completed.\n", getpid());
} else if (child_pid > 0) {
printf("Parent process (PID: %d) is running and will terminate shortly.\n", getpid());
sleep(2);
printf("Parent process (PID: %d) has terminated.\n", getpid());
} else {
perror("Fork failed");
return 1;}
return 0;}

#2
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 10
typedef struct { int p, b, tT, tW; } P;
int main() {
int n, t = 0, tTAT = 0, tWT = 0;
srand(time(0));
printf("Enter the number of processes: ");
scanf("%d", &n);
P p[N] = {0};
for (int i = 0; i < n; i++) p[i].p = rand() % 10, p[i].b = rand() % 10 + 1;
printf("Gantt Chart:\n");
for (int i = 0; i < n; i++) {
int m = -1;
for (int j = 0; j < n; j++) if (p[j].p < p[i].p) m = j;
printf("P%d ", m + 1);
p[m].tT = t + p[m].b, p[m].tW = t, t += p[m].b + 2;
tTAT += p[m].tT, tWT += p[m].tW, p[m].p = 11;}
printf("\nProcess\tTurnaround\tWaiting\n");
for (int i = 0; i < n; i++) printf("P%d\t%d\t\t%d\n", i + 1, p[i].tT, p[i].tW);
printf("Avg TAT: %.2f\nAvg WT: %.2f\n", (float)tTAT / n, (float)tWT / n);
return 0;