+/**
+ * Generic socket creation (passive and active sockets).
+ */
+extern int makesock(unsigned l3type, unsigned l4type, int passive,
+ const char *host, unsigned short port_number);
+extern struct in_addr extract_v4_addr(const struct sockaddr_storage *ss);
+
+/**
+ * Functions to support listening sockets.
+ */
+/** How many pending connections queue of a listening server will hold. */
+#define BACKLOG 10
+extern int para_listen(unsigned l3type, unsigned l4type, unsigned short port);
+
+/** Pretty-printing of IPv4/6 socket addresses */
+extern char *local_name(int sockfd);
+extern char *remote_name(int sockfd);
+
+int send_bin_buffer(int, const char *, size_t);
+int send_buffer(int, const char *);
+__printf_2_3 int send_va_buffer(int fd, const char *fmt, ...);
+
+int recv_bin_buffer(int fd, char *buf, size_t size);
+int recv_buffer(int fd, char *buf, size_t size);
+
+int para_accept(int, void *addr, socklen_t size);
+int create_local_socket(const char *name, struct sockaddr_un *unix_addr,
+ mode_t mode);
+int create_remote_socket(const char *name);
+int recv_cred_buffer(int, char *, size_t);
+ssize_t send_cred_buffer(int, char*);
+int recv_pattern(int fd, const char *pattern, size_t bufsize);