-
-int for_each_file_in_dir(const char *dirname,
- int (*func)(const char *, void *), void *private_data);
-//ssize_t para_write_all(int fd, const void *buf, size_t size);
-int para_lseek(int fd, off_t *offset, int whence);
-int para_write_file(const char *filename, const void *buf, size_t size);
-