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Linux 2.6 - man page for malloc_usable_size (linux section 3)

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MALLOC_USABLE_SIZE(3)		    Linux Programmer's Manual		    MALLOC_USABLE_SIZE(3)

NAME
       malloc_usable_size - obtain size of block of memory allocated from heap

SYNOPSIS
       #include <malloc.h>

       size_t malloc_usable_size (void *ptr);

DESCRIPTION
       The  malloc_usable_size() function returns the number of usable bytes in the block pointed
       to by ptr, a pointer to a block of memory allocated by malloc(3) or a related function.

RETURN VALUE
       malloc_usable_size() returns the number of usable bytes in the block of	allocated  memory
       pointed to by ptr.  If ptr is NULL, 0 is returned.

CONFORMING TO
       This function is a GNU extension.

NOTES
       The  value  returned by malloc_usable_size() may be greater than the requested size of the
       allocation because of alignment and minimum size constraints.  Although the  excess  bytes
       can  be	overwritten  by the application without ill effects, this is not good programming
       practice: the number of excess bytes in an allocation depends on the underlying	implemen-
       tation.

       The main use of this function is for debugging and introspection.

SEE ALSO
       malloc(3)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

GNU					    2012-03-29			    MALLOC_USABLE_SIZE(3)
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