+int para_select(int n, fd_set *readfds, fd_set *writefds,
+ struct timeval *timeout_tv);
+int mark_fd_nonblock(int fd);
+void para_fd_set(int fd, fd_set *fds, int *max_fileno);
+__must_check int para_fread(void *dest, size_t nbytes, size_t nmemb,
+ FILE *stream);
+__must_check int para_fgets(char *line, int size, FILE *f);
+int para_fseek(FILE *stream, long offset, int whence);
+void *para_mmap(size_t length, int prot, int flags, int fd, off_t offset);