DLPI Programmer's Guide

158 Appendix A
Sample Programs
Connectionless Mode
if(err_ack->dl_primitive == DL_ERROR_ACK) {
/* yup; format the ERROR_ACK info */
printf(”error: expected primitive 0x%02x, ”,
ex_prim);
printf(”got DL_ERROR_ACK\n”);
printf(” dl_error_primitive = 0x%02x\n”,
err_ack->dl_error_primitive);
printf(” dl_errno = 0x%02x\n”,
err_ack->dl_errno);
printf(” dl_unix_errno = %d\n”,
err_ack->dl_unix_errno);
exit(1);
} else {
/*
didn't get an ERROR_ACK either; print whatever
primitive we did get
*/
printf(”error: expected primitive 0x%02x, ”,
ex_prim);
printf(”got primitive 0x%02x\n”,
err_ack->dl_primitive);
exit(1);
}
} else {
/* 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)
int fd; /* file descriptor */
int length; /* length of data message */