From: Sebastian Smolorz <smolorz@domain.hid>
To: Bosko Radivojevic <bosko.radivojevic@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] RTDM question
Date: Thu, 17 Apr 2008 13:04:17 +0200 [thread overview]
Message-ID: <48072EB1.1070102@domain.hid> (raw)
In-Reply-To: <d6c8ef150804170346t4537b9dehf448cd6c9d0debb5@domain.hid>
Bosko Radivojevic wrote:
> What could be the reason of rt_dev_open() returning 0 (zero)?
>
> I can see that device is properly registered. When I start user-space
> program, I can see in /proc/xenomai/rtdm/filedes that one file is
> open:
> Index Locked Device Owner [PID]
> 0 0 macbdev0 user [306]
>
> But I never reach write function. rt_dev_write() & rt_dev_read() are
> returning -1.
Which read and write handlers do you have registered with your device
(RT/NRT)? From which context do you call the RTDM functions
(primary/secondary)?
In API documentation, for rt_dev_open return values
> says:
> Positive file descriptor value on success, otherwise a negative error code.
I think this is a bug in the documentation. Negative values mean errors,
all other values (including zero) success.
--
Sebastian
next prev parent reply other threads:[~2008-04-17 11:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-17 10:46 [Xenomai-help] RTDM question Bosko Radivojevic
2008-04-17 11:04 ` Sebastian Smolorz [this message]
2008-04-17 11:23 ` Bosko Radivojevic
-- strict thread matches above, loose matches on Subject: below --
2007-10-03 14:17 Perrine Martignoni
2007-10-04 21:44 ` Jan Kiszka
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