Re: [PATCH] setbuf.3: stdio buffers are allocated by mmap() not malloc()

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Hi Stefan,

> A little peer review before the maintainer gets a chance to reply...

Of course.

> On Thu, May 12, 2011 at 12:30 AM, John Hammond <jhammond@xxxxxxxxxxxxxxx> wrote:
>> ---
>> --- a/man3/setbuf.3
>> +++ b/man3/setbuf.3
>> @@ -83,7 +83,7 @@ may be used to force the block out early.
>>  .BR fclose (3).)
>>  Normally all files are block buffered.
>>  When the first I/O operation occurs on a file,
>> -.BR malloc (3)
>> +.BR mmap (2)
>>  is called, and a buffer is obtained.
>>  If a stream refers to a terminal (as
>>  .I stdout
> 
> Are you sure this applies to older glibc versions as well? When
> behavior of a glibc function has changed in time, usually (or I should
> probably rephrase this as "in the most fortunate cases..." :), but
> let's not be that pessimistic ) the man page specifies that; if it's
> the case here, it might be good to say: "mmap is used since glibc x.y,
> malloc was used before".

malloc() was used in 1.09, and mmap() in 2.0.1.  I've also noticed this
behavior other versions, including 2.3.4 and 2.13 (current).  But I
haven't checked all intermediate versions.  See also
http://sources.redhat.com/ml/libc-alpha/2006-11/msg00061.html for some
fruitless discussion of this issue.

Best,

John
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