From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Everett Wang <everteq@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] error on rt_dev_read, code Success, what does it mean?
Date: Sat, 12 Jun 2010 11:31:04 +0200 [thread overview]
Message-ID: <4C1353D8.2060507@domain.hid> (raw)
In-Reply-To: <AANLkTim0tClnDQPN3u5ozJSEU6BcX--Xf9Ekw00ADvgy@domain.hid>
Everett Wang wrote:
> Hi,
>
> I am developing a real time programming using xenomai, RTDM. When
> I try to read serial port, I sometimes get this message:
>
> error on rt_dev_read, code Success
>
> I checked my program and found that when rt_dev_read returns a
> negative number, this message is printed. What does this error message
> mean? It seems that my port is open when I tried to read from it.
It means that you are probably using errno, and since rt_dev_read does
not set errno, you get "Success" as error message instead of the real
error message. If you want to print the real error message, you should
use strerror(-rc) where rc is the return code of rt_dev_read.
But of course, I am just guessing here, seeing your test code would help
more.
--
Gilles.
next prev parent reply other threads:[~2010-06-12 9:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-12 4:09 [Xenomai-help] error on rt_dev_read, code Success, what does it mean? Everett Wang
2010-06-12 9:31 ` Gilles Chanteperdrix [this message]
2010-06-12 10:13 ` Everett Wang
2010-06-12 10:45 ` Jan Kiszka
2010-06-12 17:14 ` Everett Wang
2010-06-14 20:03 ` Jan Kiszka
2010-06-14 14:53 ` Luc ANTOLINOS
2010-06-15 0:45 ` Everett Wang
2010-06-15 9:27 ` Luc ANTOLINOS
2010-06-17 7:49 ` Everett Wang
2010-06-17 8:48 ` Jan Kiszka
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