kern/163076: It is not possible to read in chunks from linprocfs
jh at FreeBSD.org
Mon Dec 5 14:50:11 UTC 2011
The following reply was made to PR kern/163076; it has been noted by GNATS.
From: Jaakko Heinonen <jh at FreeBSD.org>
To: Petr Salinger <Petr.Salinger at seznam.cz>
Cc: bug-followup at FreeBSD.org, phk at FreeBSD.org
Subject: Re: kern/163076: It is not possible to read in chunks from linprocfs
Date: Mon, 5 Dec 2011 16:49:47 +0200
On 2011-12-05, Petr Salinger wrote:
> It is not possible to read in chunks from linprocfs and procfs.
> It is a regression against stable-8.
> I suspect it is due to changes of sbuf implementation between 8 and 9.
Yes, r222004 changed sbuf_finish() to not clear s->s_error which causes
the regression. I am not sure if we should blame r222004 or the pseudofs
I have Cc'd the committer of r222004.
> Some files are rather big (over 4KB) and it is really standard to read them in blocks.
> "dd if=$FILE bs=1", with FILE any file in procfs or linprocfs
> The result is empty output.
> Tried with FILE /proc/version from linprocfs
> and /proc/curproc/map from procfs.
> For more details see Debian GNU/kFreeBSD bug report
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