[linux-dvb] Re: Resource temporarily unavailable

["Karim Amrani" <kamrani@jdcv.com>]

Hi there,

I'm experiencing the 'Resource temporarily unavailable' problem too... 
(from time to time).

I'm running some test software (reading for ever packets from a PID and 
thus, checking the broadcast is OK) on a linux box (RH 7.1/ kernel 2.4.10 / 
PIII 450 MHz / 64 Mo RAM). The test program writes nothing on the disk (no 
recording).
I'm using a Hauppauge win TV DVB-S (second release) with driver version 0.9.

In my case, the errno associated with the perror message 'Resource 
temporarily unavailable' is not EWOULDBLOCK but EAGAIN (value is 11).

This 'bug' appears from time to time : the software can run for days 
without problems but sometimes it fails. I tried to stop my program and 
rerun it (it then sets again the parameters (frequency, pol, PID,...)) but 
the error is still there (not a single byte is read from now on).

The only way I found (I did not look for long !) to get back to normal is 
to reboot the PC...

If someone has a better solution...
Does my configuration fall into the lower 'system ressources' category ? 
What are the critical ressources for that kind of usage (RAM, CPU,...) ?

As I intend to put another DVB card into the same PC to survey 2 PIDs on 2 
different satellites at the same time, I'd rather make sure my 
configuration is sufficient.

Thanks in advance,
Sincerely,
Karim AMRANI

At 13:54 04/01/02, Jon Folland wrote:
>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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>
>
>
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