[3955] in arla-drinkers
Re: xfs behaviour on OpenBSD
daemon@ATHENA.MIT.EDU (Kristaps Johnson)
Thu Jun 15 08:44:46 2006
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Date: Thu, 15 Jun 2006 08:44:37 -0400 (EDT)
From: Kristaps Johnson <kristaps@gradient-enterprises.com>
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To: =?iso-8859-1?q?Love_H=F6rnquist_=C5strand?= <lha@kth.se>
Subject: Re: xfs behaviour on OpenBSD
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>> Hello everybody. I wonder if somebody can shed some light on strange
>> behahiour (or sloppy thinking on my part).
>>
>> If I mount_xfs on OpenBSD (3.9), and run two versions of a programme, one
>> that read(2)s and one that fread(3)s, the read returns end-of-file while
>> the fread returns correct values.
>
> nnpfs dev will only return untruncted messages, you need to pass in a
> larger buffer.
>
> fread behavies diffrently because its buffered in libc, ktrace and
> you'll see that the read(2) is larger then 1 byte.
Problem solved. I was trying to read a single sizeof struct
nnpfs_message_header and kept receiving eof. I'll revert back to
NNPFS_MSG_MAX_DATASIZE. Thank you, Kristaps.
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