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Re: controlling stdio buffering

From: Andreas Schwab
Subject: Re: controlling stdio buffering
Date: Wed, 22 Mar 2006 11:42:25 +0100
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/22.0.50 (gnu/linux)

Pádraig Brady <address@hidden> writes:

> It's just that above call seems to have no affect,

The standard does not require that setvbuf has any visible effect apart
from honoring the buffering mode. The setvbuf function

    ... If buf is not a null pointer, the array it points to may be used
    instead of a buffer allocated by the setvbuf function and the argument
    size specifies the size of the array; otherwise, size may determine
    the size of a buffer allocated by the setvbuf function. ...

Note the use of "may" instead of "shall".


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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