int yaffs_read(int fd, void *buf, unsigned int nbyte) ;
int yaffs_write(int fd, const void *buf, unsigned int nbyte) ;
int yaffs_pread(int fd, void *buf, unsigned int nbyte, Y_LOFF_T offset);
int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, Y_LOFF_T offset);
int yaffs_read(int fd, void *buf, unsigned int nbyte) ;
int yaffs_write(int fd, const void *buf, unsigned int nbyte) ;
int yaffs_pread(int fd, void *buf, unsigned int nbyte, Y_LOFF_T offset);
int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, Y_LOFF_T offset);