#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>
#include <sys/wait.h>

using namespace std;

void ReportUID(string which, uid_t value) {
    struct passwd *pwent;
    if(nullptr == (pwent = getpwuid(value))) {
       perror("getpwuid");
       return;
    }
    cout << "\t"<<which <<": " << pwent->pw_name << endl;

    return;
}

void ReportUIDS(void) {
    uid_t real, effective, saved;

    if( -1 == getresuid(&real, &effective, &saved)){
       perror("getresuid");
       exit(1);
    }
    ReportUID("MYID: Real", real);
    ReportUID("MYID: Effective", effective);
    ReportUID("MYID: Saved", saved);
    cout << endl;

    return;
}

int main() {
    ReportUIDS();
    return 0;

}