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[Bug libc/1349] malloc_usable_size() incorrect when MALLOC_CHECK_>0
- From: "drepper at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 28 Sep 2005 22:45:55 -0000
- Subject: [Bug libc/1349] malloc_usable_size() incorrect when MALLOC_CHECK_>0
- References: <20050917180908.1349.jkearney@endeca.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From drepper at redhat dot com 2005-09-28 22:45 -------
You are misusing malloc_usable_size(). The function gives you information on
how much memory a really call can provide you in place. It does not
automagically extends the memory block. The realloc call is needed.
Admittedly, the information returned by malloc_usable_size() doesn't take the
magic byte into account and therefore a really call, which would normally be
extended in place, can require a repositioning. But this is no big issue and
not worth changing.
In summary: your test code is wrong and deserves to crash.
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What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
http://sourceware.org/bugzilla/show_bug.cgi?id=1349
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