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OSX 10.6.2 - man page for malloc_size (osx section 3)

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MALLOC_SIZE(3)			   BSD Library Functions Manual 		   MALLOC_SIZE(3)

NAME
     malloc_good_size, malloc_size -- memory allocation information

SYNOPSIS
     #include <malloc/malloc.h>

     size_t
     malloc_good_size(size_t size);

     size_t
     malloc_size(const void *ptr);

DESCRIPTION
     The malloc_size() function returns the size of the memory block that backs the allocation
     pointed to by ptr.  The memory block size is always at least as large as the allocation it
     backs, and may be larger.

     The malloc_good_size() function rounds size up to a value that the allocator implementation
     can allocate without adding any padding; it then returns that rounded-up value.

SEE ALSO
     malloc(3)

BSD					   May 23, 2006 				      BSD
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