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)
malloc_usable_size - obtain size of block of memory allocated from heap
size_t malloc_usable_size (void *ptr);
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.
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.
This function is a GNU extension.
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-
The main use of this function is for debugging and introspection.
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
GNU 2012-03-29 MALLOC_USABLE_SIZE(3)
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