void showError(char const *message) {
	std::cerr << message <<::strerror(errno)<<std::endl;
}

Anwendungsbeispiel:

	int readBytes=read(in,inbuf,sizeof(inbuf));
	if (readBytes >0) {
		writeNBytesToFiledescriptor(out,inbuf,readBytes);
	} else {
		if (readBytes < 0) {
			showError("error reading stdin: ");
		}
		eofInput=true;
		close(in);
		cerr <<"eof on input"<<endl;
	}