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Re: sed bug on seekable stdin
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From: |
Andreas Schwab |
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Subject: |
Re: sed bug on seekable stdin |
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Date: |
Mon, 18 Dec 2006 00:49:49 +0100 |
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User-agent: |
Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.91 (gnu/linux) |
Eric Blake <address@hidden> writes:
> According to Bob Proulx on 12/17/2006 12:13 PM:
>>
>> AFAIK fflush() is not needed in input streams as its purpose is to
>> flush pending output buffers and input streams have none.
>
> Wrong. According to POSIX, fflush followed by fseek is required to have
> the side effect of setting the byte offset of the underlying fd, even on
> input streams.
fflush on an input stream has undefined behaviour.
Andreas.
--
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."
Re: sed bug on seekable stdin, Paolo Bonzini, 2006/12/18