size_t mincnt, size_t maxcnt,
unsigned int time_out,
size_t *size_ret);
-NTSTATUS read_data(int fd, char *buffer, size_t N);
+NTSTATUS read_data_ntstatus(int fd, char *buffer, size_t N);
ssize_t write_data(int fd, const char *buffer, size_t N);
ssize_t iov_buflen(const struct iovec *iov, int iovlen);
uint8_t *iov_buf(TALLOC_CTX *mem_ctx, const struct iovec *iov, int iovcnt);