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/** System Programming (6) : fork(2) **/

#include <sys/types.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

int main(void)

{

pid_t pid;

switch( pid = fork() )

{

case -1 : // fork failed

perror("fork failed");

exit(1);

break;

case 0 : // child process

printf("Child Process --- \n");

printf("PID : %d, PPID : %d \n", (int)getpid(), (int)getppid());

break;

default : // parent process

printf("Parent Process --- \n");

printf("PID : %d, PPID : %d, Child PID : %d \n", (int)getpid(), (int)getppid(), (int)pid);

break;

}

printf("- - - - - - \n");

return 0;

}