MALLOC_USABLE_SIZE(3) manual page
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malloc_usable_size - obtain size of block of
memory allocated from heap
#include <malloc.h>
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.
The
malloc_usable_size() function is thread-safe.
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 implementation.
The main use of this function is for debugging and introspection.
malloc(3)
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A description of the project, information about reporting bugs, and the
latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
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