Program to print its Process ID, Parent Process ID and Group ID

/*
 * Program to print its Process ID, Parent Process ID and Group ID
 */

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

int main()
{
        pid_t pid, ppid;
    gid_t gid;

    /* get the process id */
    if ((pid = getpid()) < 0) {
      perror("
unable to get pid");
    } else {
      printf("
The process id is %d", pid);
    }

    /* get the parent process id */
    if ((ppid = getppid()) < 0) {
      perror("
unable to get the ppid");
    } else {
      printf("
The parent process id is %d", ppid);
    }

    /* get the group process id */
    if ((gid = getgid()) < 0) {
      perror("
unable to get the group id
");
    } else {
      printf("
The group id is %d
", gid);
    }

    return(0);
}