int recv_buffer(int fd, char *buf, size_t size);
int recv_bin_buffer(int fd, char *buf, size_t size);
int para_accept(int, void *addr, socklen_t size);
int recv_buffer(int fd, char *buf, size_t size);
int recv_bin_buffer(int fd, char *buf, size_t size);
int para_accept(int, void *addr, socklen_t size);