Replacements for {set,get,end}utent calls.

+/* utmp.c -- Replacements for {set,get,end}utmp functions
+
+Copyright (C) 2002 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include <utmp.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+static char *utmp_name = _PATH_UTMP;
+static int fd = -1;
+static struct utmp ut;
+
+void
+setutent ()
+{
+  endutent ();
+  if ((fd = open (utmp_name, O_RDWR)) < 0
+      && ((fd = open (utmp_name, O_RDONLY)) < 0))
+    perror ("setutent: Can't open utmp file");
+}
+
+void
+endutent ()
+{
+  if (fd > 0)
+    close (fd);
+  fd = -1;
+}
+
+struct utmp *
+getutent ()
+{
+  if (fd < 0)
+    setutent ();
+
+  if (fd < 0 || read (fd, &ut, sizeof ut) != sizeof ut)
+    return NULL;
+
+  return &ut;
+}
+