HP 800 HP DLPI Programmer's Guide - Page 206

Sample Programs Connectionless Mode Example /* no control; did we get data? */ if(data_buf.len) { /* tell user we only got data */ printf("error: check_ctrl found only data\n"); exit(1); } else { /* no message???; well, it was probably an interrupted system call */ printf("error: check_ctrl found no message\n"); exit(1); } } } } put a message consisting of only a data part on a stream void put_data(fd, length) intfd;/* file descriptor */ intlength;/* length of data message */ { /* set the len field in the strbuf structure */ data_buf.len = length; /* call putmsg and check for an error */ if(putmsg(fd, 0, &data_buf, 0) < 0) { printf("error: put_data putmsg failed, errno = %d\n", errno); exit(1); } } put a message consisting of only a control part on a stream void put_ctrl(fd, length, pri) intfd;/* file descriptor */ intlength;/* length of control message */ intpri;/* priority of message: either 0 or RS_HIPRI */ { /* set the len field in the strbuf structure */ ctrl_buf.len = length; 206 Appendix A