#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <utmp.h>

int main(void)
{
        FILE *fp;
        struct utmp u;

        fp = fopen(_PATH_UTMP, "r");
        if (fp == NULL) {
                perror(_PATH_UTMP);
                exit(-1);
        }

        while (fread(&u, sizeof(u), 1, fp) == 1) {
                if (u.ut_type != DEAD_PROCESS) {
                        time_t t = u.ut_time;
                        printf("%8.8s|%16.16s|%8.8s|%s", u.ut_name,
                               u.ut_host, u.ut_line, ctime(&t));
                }
        }

        fclose(fp);

        return 0;
}