Set the file to read from the location specified by _pos_.
@param fp BGZF file handler @param pos virtual file offset returned by bgzf_tell() @param whence must be SEEK_SET @return 0 on success and -1 on error
@note It is not permitted to seek on files open for writing, or files compressed with gzip (as opposed to bgzip).
See Implementation
Set the file to read from the location specified by _pos_.
@param fp BGZF file handler @param pos virtual file offset returned by bgzf_tell() @param whence must be SEEK_SET @return 0 on success and -1 on error
@note It is not permitted to seek on files open for writing, or files compressed with gzip (as opposed to bgzip).