ssize_t rd = 0;
size_t sofar = 0;
while (rd = read( fd, buf + sofar, BUFSIZE - sofar)) {
        switch (rd) {
                case -1:
                        switch (errno) {
                                case EAGAIN :
                                case EINTR :
                                        continue;
                                default :
                                        /* unrecoverable */
                                        abort();
                        }
                default:
                        sofar += rd;
        }
}