Add TCP_* constants included in "netinet/tcp.h".

ex: TCP_NODELAY, TCP_CORK, ...

src/const.cstub

@@ -376,3 +376,45 @@
 #ifdef SOL_SOCKET
   define_const(SOL_SOCKET);
 #endif
+#ifdef TCP_NODELAY
+  define_const(TCP_NODELAY);
+#endif
+#ifdef TCP_MAXSEG
+  define_const(TCP_MAXSEG);
+#endif
+#ifdef TCP_CORK
+  define_const(TCP_CORK);
+#endif
+#ifdef TCP_KEEPIDLE
+  define_const(TCP_KEEPIDLE);
+#endif
+#ifdef TCP_KEEPINTVL
+  define_const(TCP_KEEPINTVL);
+#endif
+#ifdef TCP_KEEPCNT
+  define_const(TCP_KEEPCNT);
+#endif
+#ifdef TCP_SYNCNT
+  define_const(TCP_SYNCNT);
+#endif
+#ifdef TCP_LINGER2
+  define_const(TCP_LINGER2);
+#endif
+#ifdef TCP_DEFER_ACCEPT
+  define_const(TCP_DEFER_ACCEPT);
+#endif
+#ifdef TCP_WINDOW_CLAMP
+  define_const(TCP_WINDOW_CLAMP);
+#endif
+#ifdef TCP_INFO
+  define_const(TCP_INFO);
+#endif
+#ifdef TCP_QUICKACK
+  define_const(TCP_QUICKACK);
+#endif
+#ifdef TCP_CONGESTION
+  define_const(TCP_CONGESTION);
+#endif
+#ifdef TCP_MD5SIG
+  define_const(TCP_MD5SIG);
+#endif

src/const.def

@@ -134,3 +134,18 @@ SOCK_SEQPACKET
 SOCK_STREAM
 
 SOL_SOCKET
+
+TCP_NODELAY
+TCP_MAXSEG
+TCP_CORK
+TCP_KEEPIDLE
+TCP_KEEPINTVL
+TCP_KEEPCNT
+TCP_SYNCNT
+TCP_LINGER2
+TCP_DEFER_ACCEPT
+TCP_WINDOW_CLAMP
+TCP_INFO
+TCP_QUICKACK
+TCP_CONGESTION
+TCP_MD5SIG

src/socket.c

@@ -9,6 +9,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <netdb.h>