Hi, Correct me if I am wrong, if I give -1 as the timeout parameter to ipq_read, then ipq_read returns : -1 incase of an error, a +ve non zero value, if there was something to read 0 if there was nothing to read, or a non-blocked signal was caught . Also, since I gave this -ve value as timeout parameter ipq_read would return immediately if there was nothing to read . regards Amit "DISCLAIMER: This message is proprietary to Hughes Software Systems Limited (HSS) and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. HSS accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus."