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 herr_t
 ss_file_readonly(ss_file_t *file)
 {
     SS_ENTER(ss_file_readonly, herr_t);
     ss_gfile_t  *gfile=NULL;

     if (ss_file_isopen(file, NULL)<=0) SS_ERROR(NOTOPEN);
     if (NULL==(gfile=SS_GFILE_LINK(file))) SS_ERROR(NOTFOUND);
     gfile->flags &= ~H5F_ACC_RDWR;
     gfile->flags |= H5F_ACC_RDONLY;
 SS_CLEANUP:
     SS_LEAVE(0);
 }