int    RAM_open(const char *path, unsigned flags, int llv_fd);int    RAM_close(int dev_fd);int    RAM_read(int dev_fd, char *buf, unsigned count);int    RAM_write(int dev_fd, const char *buf, unsigned count);fpos_t RAM_lseek(int dev_fd, fpos_t offset, int origin);int    RAM_unlink(const char *path);int    RAM_rename(const char *old_name, const char *new_name);