From: Marc Kleine-Budde <mkl@pengutronix.de>
To: s-amarce <s-amarce@haw-landshut.de>, linux-can@vger.kernel.org
Subject: Re: Canplayer play to can0 - problem
Date: Mon, 19 Oct 2015 11:41:22 +0200 [thread overview]
Message-ID: <5624BAC2.6050002@pengutronix.de> (raw)
In-Reply-To: <447a130eb0e223d5336a160a19d91648@haw-landshut.de>
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On 10/19/2015 11:14 AM, s-amarce wrote:
> I am currently trying to play a recorded log-file to my installed device
> can0. There are no problems when the data is streamed to the device
> using a cable.
> I managed to stream the log file to a virtual device executing the
> command canplayer can0=3Dvcan0 < file.log.
> Using this command I can see all the data using candump vcan0 without
> any problems.
> However when I try to run: canplayer can0=3Dcan0 < file.log, I receive
> the error: "sendto: No buffer space available."
> Is it possible to replay logfiles to real devices like can0 or do I have
> to use virtual devices?
>
> My ifconfig after reboot:
> can0 Link encap:UNSPEC HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> UP RUNNING NOARP MTU:16 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:10
> RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
> Interrupt:68
>
> // The error
> canplayer can0=3Dcan0 < data.log
> sendto: No buffer space available
>
> // After
> ifconfig can0
> can0 Link encap:UNSPEC HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
> UP RUNNING NOARP MTU:16 Metric:1
> RX packets:2 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:10
> RX bytes:16 (16.0 B) TX bytes:0 (0.0 B)
> Interrupt:68
>
> I hope you can help me with this. I look forward to hearing from you.
You have to add a loop like this:
resend:
nbytes = write(s, &frame, mtu);
if (nbytes < 0) {
if (errno != ENOBUFS) {
perror("write");
return -1;
}
/* wait for the write socket (with timeout) */
if (poll(&fds, 1, polltimeout) < 0) {
perror("poll");
return -1;
} else {
goto resend;
}
} else if (nbytes < mtu) {
fprintf(stderr, "write: incomplete CAN frame\n");
return 1;
}
Patches welcome,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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prev parent reply other threads:[~2015-10-19 9:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 9:14 Canplayer play to can0 - problem s-amarce
2015-10-19 9:41 ` Marc Kleine-Budde [this message]
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