*/
virtual ssize_t writev(const struct iovec*, int iovcnt) throw() = 0;
+ virtual ssize_t preadv(const struct iovec *iov, int iovcnt, off64_t offset) throw() = 0;
+ virtual ssize_t pwritev(const struct iovec *iov, int iovcnt, off64_t offset) throw() = 0;
+
/**
* \brief Change the file pointer.
*