[linux-dvb] Re: Resource temporarily unavailable

["Jon Folland" <jon@nativ.tv>]

What spec PC are you using? I think it is related to system resources rather
than any particular bug. It happens to me from time to time.

This error seems to be thrown by the driver when if finds that its buffer
has not been written to by the device. I think it basically spin locks,
waiting for something to be written. Although I could be wrong. If nothing
has been written and it is not set to block it simply throws an error.

Check the function DmxDevBufferRead(), below extracted from dmxdev.c:

The -EWOULDBLOCK error code is causing the "Resource temporarily
unavailable" error and it is thrown in the piece of code I have extracted
from that function.

	.....

	if (non_blocking && (src->pwrite==src->pread)){
		return -EWOULDBLOCK;

	.....





	}-----Original Message-----
From: linux-dvb-bounce@linuxtv.org
[mailto:linux-dvb-bounce@linuxtv.org]On Behalf Of Paul Adriaenssens
Sent: 04 January 2002 12:47
To: linux-dvb@linuxtv.org
Subject: [linux-dvb] Resource temporarily unavailable


We are using a Hauppauge WinTV-NOVA satellite card (model 541) to test
the reception of multicast data which is sent by our own IP-gateway in
an endless loop.

In order to receive and decode the data we use a java program which
opens a MulticastSocket on the correct port of the dvb0_0 interface and
receives the DatagramPackets from it.

This process runs continuously to test the stability of the driver and
our own FEC decoding software. It can run without any problem for
several hours, even days, receiving all transmitted bytes, and then
suddenly we get several of the following errors:

java.net.SocketException: Resource temporarily unavailable
at java.net.PlainDatagramSocketImpl.receive(Native Method)
at java.net.DatagramSocket.receive(DatagramSocket.java:672)

When this SocketException occurs, all bytes of the DatagramPacket get
lost! We can't find any dvb kernel messages in /var/log/messages and we
figured out that there is no correlation with the SNR or BER (even with
BER=0 errors occured).

Has anybody else stress tested the dvb API for multicast data reception
by one of the dvb0_* interfaces?
Do we need to "retune" de dvb card from time to time with "ntuxzap -c"
or "szap -n" to avoid long uptime problems?
Can we get more logging from the dvb API to get more details about the
reason for this problem?

We are using siemens_dvb-0.9.3 and Linux 2.4.9-13.

Thanks,

Paul

-------- Original Message --------
Subject: [linux-dvb] Resource temporarily unavailable
Date: Sun, 30 Dec 2001 14:51:07 -0000
From: "Jon Folland" <jon@nativ.tv>
To: <linux-dvb@linuxtv.org>

Has anybody come across the "Resource temporarily unavailable" error when
reading from a demux device?
I can open the device and set a PES or section filter successfully. However
calling read() gives the above error.

Anybody know how to remedy this without having to buy a new PC?

I am using a Hauppage WinTV-NOVA model 541 satellite card.



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