(krb5_set_real_time): handle negative usec

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@23260 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/time.c

@@ -35,10 +35,18 @@
 
 RCSID("$Id$");
 
-/*
+/**
  * Set the absolute time that the caller knows the kdc has so the
  * kerberos library can calculate the relative diffrence beteen the
  * KDC time and local system time.
+ *
+ * @param context Keberos 5 context.
+ * @param sec The applications new of "now" in seconds
+ * @param usec The applications new of "now" in micro seconds
+
+ * @return Kerberos 5 error code, see krb5_get_error_message().
+ *
+ * @ingroup krb5
  */
 
 krb5_error_code KRB5_LIB_FUNCTION
@@ -51,12 +59,21 @@ krb5_set_real_time (krb5_context context,
     gettimeofday(&tv, NULL);
 
     context->kdc_sec_offset = sec - tv.tv_sec;
+
+    /**
+     * If the caller passes in a negative usec, its assumed to be
+     * unknown and the function will use the current time usec.
+     */
+    if (usec >= 0) {
 	context->kdc_usec_offset = usec - tv.tv_usec;
 
 	if (context->kdc_usec_offset < 0) {
 	    context->kdc_sec_offset--;
 	    context->kdc_usec_offset += 1000000;
 	}
+    } else 
+	context->kdc_usec_offset = tv.tv_usec;
+
     return 0;
 }