+ MSG_TRUNC = 0x20,
+#define MSG_TRUNC MSG_TRUNC
+ MSG_DONTWAIT = 0x40, /* Nonblocking IO. */
+#define MSG_DONTWAIT MSG_TRUNC
+ MSG_EOR = 0x80, /* End of record. */
+#define MSG_EOR MSG_EOR
+ MSG_WAITALL = 0x100, /* Wait for a full request. */
+#define MSG_WAITALL MSG_WAITALL
+ MSG_FIN = 0x200,
+#define MSG_FIN MSG_FIN
+ MSG_SYN = 0x400,
+#define MSG_SYN MSG_SYN
+ MSG_URG = 0x800,
+#define MSG_URG MSG_URG
+ MSG_RST = 0x1000,
+#define MSG_RST MSG_RST
+ MSG_ERRQUEUE = 0x2000,
+#define MSG_ERRQUEUE MSG_ERRQUEUE
+ MSG_NOSIGNAL = 0x4000
+#define MSG_NOSIGNAL MSG_NOSIGNAL