[Xenomai-help] rt_dev_send() does not timeout

[Xenomai-help] rt_dev_send() does not timeout

[Charlton, John]

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We are experiencing a problem with the user mode CanFestival library when it calls rt_dev_send() when the CAN bus is disconnected.  In that case the rtcan driver info is:

root@domain.hid:~# cat /proc/rtcan/rtcan0/info
Device     rtcan0
Controller SJA1000
Board      PEAK-PCI
Clock-Hz   8000000
Baudrate   1000000
Bit-time   brp=1 prop_seg=0 phase_seg1=5 phase_seg2=2 sjw=1 sam=0
Ctrl-Mode
State      passive
TX-Counter 1
RX-Counter 0
Errors     2
Refcount   3
root@domain.hid:~#

The rt_dev_send() function hangs and does not timeout or return an error and never returns. We are using Xenomai 2.5.2 with linux 2.6.32.7.

John


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Re: [Xenomai-help] rt_dev_send() does not timeout

[Wolfgang Grandegger]

On 06/21/2010 04:52 PM, Charlton, John wrote:
> We are experiencing a problem with the user mode CanFestival library when it calls rt_dev_send() when the CAN bus is disconnected.  In that case the rtcan driver info is:
> 
> root@domain.hid:~# cat /proc/rtcan/rtcan0/info
> Device     rtcan0
> Controller SJA1000
> Board      PEAK-PCI
> Clock-Hz   8000000
> Baudrate   1000000
> Bit-time   brp=1 prop_seg=0 phase_seg1=5 phase_seg2=2 sjw=1 sam=0
> Ctrl-Mode
> State      passive
> TX-Counter 1
> RX-Counter 0
> Errors     2
> Refcount   3
> root@domain.hid:~#
> 
> The rt_dev_send() function hangs and does not timeout or return an error and never returns. We are using Xenomai 2.5.2 with linux 2.6.32.7.

It's the normal behaviour if you have not set RTCAN_RTIOC_SND_TIMEOUT
and don't use non-blocking mode. Is that the case?

Wolfgang.

Re: [Xenomai-help] rt_dev_send() does not timeout

[Charlton, John]

Thank you.  I overlooked that one.  That was the problem. 

-----Original Message-----
From: Wolfgang Grandegger [mailto:wg@domain.hid
Sent: Monday, June 21, 2010 1:10 PM
To: Charlton, John
Cc: 'xenomai@xenomai.org'
Subject: Re: [Xenomai-help] rt_dev_send() does not timeout

On 06/21/2010 04:52 PM, Charlton, John wrote:
> We are experiencing a problem with the user mode CanFestival library when it calls rt_dev_send() when the CAN bus is disconnected.  In that case the rtcan driver info is:
> 
> root@domain.hid:~# cat /proc/rtcan/rtcan0/info
> Device     rtcan0
> Controller SJA1000
> Board      PEAK-PCI
> Clock-Hz   8000000
> Baudrate   1000000
> Bit-time   brp=1 prop_seg=0 phase_seg1=5 phase_seg2=2 sjw=1 sam=0
> Ctrl-Mode
> State      passive
> TX-Counter 1
> RX-Counter 0
> Errors     2
> Refcount   3
> root@domain.hid:~#
> 
> The rt_dev_send() function hangs and does not timeout or return an error and never returns. We are using Xenomai 2.5.2 with linux 2.6.32.7.

It's the normal behaviour if you have not set RTCAN_RTIOC_SND_TIMEOUT and don't use non-blocking mode. Is that the case?

Wolfgang.