+int Curl_closesocket(struct connectdata *conn, curl_socket_t sock);
+
+/*
+ * The Curl_sockaddr_ex structure is basically libcurl's external API
+ * curl_sockaddr structure with enough space available to directly hold any
+ * protocol-specific address structures. The variable declared here will be
+ * used to pass / receive data to/from the fopensocket callback if this has
+ * been set, before that, it is initialized from parameters.
+ */
+struct Curl_sockaddr_ex {
+ int family;
+ int socktype;
+ int protocol;
+ unsigned int addrlen;
+ union {
+ struct sockaddr addr;
+ struct Curl_sockaddr_storage buff;
+ } _sa_ex_u;
+};
+#define sa_addr _sa_ex_u.addr
+
+/*
+ * Create a socket based on info from 'conn' and 'ai'.
+ *
+ * Fill in 'addr' and 'sockfd' accordingly if OK is returned. If the open
+ * socket callback is set, used that!
+ *
+ */
+CURLcode Curl_socket(struct connectdata *conn,
+ const Curl_addrinfo *ai,
+ struct Curl_sockaddr_ex *addr,
+ curl_socket_t *sockfd);
+
+#ifdef CURLDEBUG
+/*
+ * Curl_connclose() sets the bit.close bit to TRUE with an explanation.
+ * Nothing else.
+ */
+void Curl_conncontrol(struct connectdata *conn,
+ bool closeit,
+ const char *reason);
+#define connclose(x,y) Curl_conncontrol(x,TRUE, y)
+#define connkeep(x,y) Curl_conncontrol(x, FALSE, y)
+#else /* if !CURLDEBUG */
+
+#define connclose(x,y) (x)->bits.close = TRUE
+#define connkeep(x,y) (x)->bits.close = FALSE