[MEDIUM] add support for SO_REUSEPORT on Linux
SO_REUSEPORT does not exist on Linux but the checks are available in
the code. With a little patch, it's possible to implement the feature,
but the value of SO_REUSEPORT will still have to be known from userland.
This patch adds a workaround to this problem by figuring out the value
for the one used by SO_REUSEADDR.
diff --git a/include/common/compat.h b/include/common/compat.h
index 58908d7..8261f8f 100644
--- a/include/common/compat.h
+++ b/include/common/compat.h
@@ -49,6 +49,19 @@
#include <linux/netfilter_ipv4.h>
#endif
+/* We'll try to enable SO_REUSEPORT on Linux 2.4 and 2.6 if not defined.
+ * There are two families of values depending on the architecture. Those
+ * are at least valid on Linux 2.4 and 2.6, reason why we'll rely on the
+ * NETFILTER define.
+ */
+#if !defined(SO_REUSEPORT) && defined(NETFILTER)
+#if (SO_REUSEADDR == 2)
+#define SO_REUSEPORT 15
+#elif (SO_REUSEADDR == 0x0004)
+#define SO_REUSEPORT 0x0200
+#endif /* SO_REUSEADDR */
+#endif /* SO_REUSEPORT */
+
#if defined(__dietlibc__)
#include <strings.h>
#endif