- if ((nread=read(map->fd,map->p + read_offset,read_size)) != read_size) {
- if (nread < 0) nread = 0;
- /* the best we can do is zero the buffer - the file
- has changed mid transfer! */
- memset(map->p+read_offset+nread, 0, read_size - nread);
+ if (map->p_fd_offset != read_start) {
+ OFF_T ret = do_lseek(map->fd, read_start, SEEK_SET);
+ if (ret != read_start) {
+ rsyserr(FERROR, errno, "lseek returned %.0f, not %.0f",
+ (double)ret, (double)read_start);
+ exit_cleanup(RERR_FILEIO);