#include <sys/types.h>
#include <unistd.h>
#include <utmp.h>
#include <stdio.h>
#include <string.h>

int main (int argc, char **argv)
{
  int i;
  const char *n;
  struct utmp u, *pu;

  n = ttyname (STDIN_FILENO);
  printf ("Terminal name is: %s\n", n);

  memset (&u, '\0', sizeof (u));
  u.ut_type = USER_PROCESS;
  strcpy (u.ut_line, n);
  if (!strncasecmp (n, "/dev/", 5))
    strncpy (u.ut_line, n + 5, UT_LINESIZE);
  else
    strncpy (u.ut_line, n, UT_LINESIZE);

  for (i = 0; i < 2; i++)
    {
      u.ut_id[0] = 'a' + i;
      setutent ();
      pututline (&u);
      printf ("Wrote utmp entry: type %d, id %s, line %s\n", u.ut_type,
	      u.ut_id, u.ut_line);
    }

  setutent ();
  pu = getutid (&u);
  printf ("Calling getutid () with id %s: id = %s, line = %s\n", u.ut_id, pu->ut_id, pu->ut_line);
  pu->ut_line[0] = 'T';
  printf ("About to write the following utmp entry: id %s, line %s\n", pu->ut_id, pu->ut_line);
  setutent ();
  pututline (pu);
  printf ("Calling pututline () with id %s, setting line to %s\n", pu->ut_id, pu->ut_line);

  for (i = 0; i < 2; i++)
    {
      u.ut_id[0] = 'a' + i;
      setutent ();
      pu = getutid (&u);
      printf ("Calling getutid () with id %s: id = %s, line = %s\n", u.ut_id, pu->ut_id, pu->ut_line);
    }

  endutent ();
  exit (0);
}