+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);