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


#define LLOG "/var/log/wtmp"

int main ( int argc, char *argv[] )
{
   struct utmp ut;
   int    lfd;

   lfd = open(LLOG, O_RDONLY);

   if ( lfd == -1 ) {
      printf("Could not open log file %s\n", LLOG);
      return EXIT_FAILURE;
   }

   while ( read(lfd, &ut, sizeof(ut)) == sizeof(ut) ) {
      printf("user: %s from %s\n", ut.ut_user, ut.ut_host);
   }

   return 0;
}