libnetworking: Make rtems_dhcp_failsafe() run time configurable

rtems_dhcp_failsafe() can be configured at compile time with
various options. This change makes it possible to instead configure
it at runtime.

This will make it marginally larger. I haven't measured the difference
but I'll guess it's in the lower hundreds of bytes. The change could be
modified to leave it either compile time or run time configurable,
I prefer the simplicity of a single method.

closes #1905

1 files changed, 37 insertions, 0 deletions

diff --git a/cpukit/libnetworking/rtems/rtems_dhcp_failsafe.h b/cpukit/libnetworking/rtems/rtems_dhcp_failsafe.h
index 7ed131aa77..3c5a59fcb0 100644
--- a/cpukit/libnetworking/rtems/rtems_dhcp_failsafe.h
+++ b/cpukit/libnetworking/rtems/rtems_dhcp_failsafe.h
@@ -18,8 +18,45 @@
 extern "C" {
 #endif
 
+/* Default settings for the DHCP failsafe.  They can be overridden
+ * using rtems_bsdnet_dhcp_failsafe_config(); see that for descriptions.
+ */
+#ifndef RTEMS_DHCP_FAILSAFE_NETWORK_FAIL_TIMEOUT
+#define RTEMS_DHCP_FAILSAFE_NETWORK_FAIL_TIMEOUT 5
+#endif
+
+#ifndef RTEMS_DHCP_FAILSAFE_NETWORK_DOWN_TIME
+#define RTEMS_DHCP_FAILSAFE_NETWORK_DOWN_TIME 30
+#endif
+
+#ifndef RTEMS_DHCP_FAILSAFE_BROADCAST_DELAY
+#define RTEMS_DHCP_FAILSAFE_BROADCAST_DELAY 0
+#endif
+
+#ifndef RTEMS_DHCP_FAILSAFE_DHCP_MONITOR_PRIORITY
+#define RTEMS_DHCP_FAILSAFE_DHCP_MONITOR_PRIORITY 250
+#endif
+
+
 void rtems_bsdnet_do_dhcp_failsafe (void);
 
+/** Set the DHCP fallback options.  See the commentary at the top of the
+ * implementation.
+ @note Some of these options can be compile-time disabled - see the code.
+ */
+void rtems_bsdnet_dhcp_failsafe_config(
+  int network_fail_timeout, /**< The number of seconds before the interface is
+                              *  considered disconnected
+                              */
+  int network_down_time,    /**< The number of seconds the interface
+                              *  remains down.
+                              */
+  int broadcast_delay,      /**< The delay in seconds before broadcasts
+                              * are sent.
+                              */
+  int dhcp_monitor_priority /**< The monitor priority.*/
+);
+
 #ifdef __cplusplus
 }
 #endif