+#include <sys/socket.h>
+
+#define AI_PASSIVE 0x001
+#define AI_V4MAPPED 0x002
+#define AI_ADDRCONFIG 0x004
+#define AI_NUMERICHOST 0x008
+#define AI_NUMERICSERV 0x010
+
+#define NI_NAMEREQD (1<<0)
+#define NI_DGRAM (1<<1)
+#define NI_NOFQDN (1<<2)
+#define NI_NUMERICHOST (1<<3)
+#define NI_NUMERICSERV (1<<4)
+
+enum
+{
+ EAI_SUCCESS,
+ EAI_AGAIN,
+ EAI_BADFLAGS,
+ EAI_FAMILY,
+ EAI_SOCKTTPE,
+
+ EAI_ADDRFAMILY,
+ EAI_FAIL,
+ EAI_MEMORY,
+ EAI_NODATA,
+ EAI_NONAME,
+ EAI_SERVICE,
+ EAI_SYSTEM,
+ EAI_OVERFLOW
+};