sprintf(fnamebak,"%s%s",fname,backup_suffix);
if (rename(fname,fnamebak) != 0 && errno != ENOENT) {
fprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));
sprintf(fnamebak,"%s%s",fname,backup_suffix);
if (rename(fname,fnamebak) != 0 && errno != ENOENT) {
fprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));