fork-6.c

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

#define N 4
void main()
{
	pid_t pid[N];
	int i;
	int status;

	for (i = 0; i < N; i++)
		if ((pid[i] = fork()) == 0) { /* Child */
			exit(i+1); 
		}

	for (i = 0; i < N; i++) { /* Parent */
		if (pid[i] % 2 == 0) {
			pid_t wpid = waitpid(pid[i], &status, 0);
			if (WIFEXITED(status))
				printf("Child %d terminated with exit status %d\n",wpid, WEXITSTATUS(status));
			else
				printf("Child %d terminated abnormally\n", wpid);
		}
	}
}