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_msize

Returns the size of a memory block allocated in the heap.

Syntax

size_t _msize(
   void *memblock
);

Parameters

memblock
Pointer to the memory block.

Return value

_msize returns the size (in bytes) as an unsigned integer.

Remarks

The _msize function returns the size, in bytes, of the memory block allocated by a call to calloc, malloc, or realloc.

When the application is linked with a debug version of the C run-time libraries, _msize resolves to _msize_dbg. For more information about how the heap is managed during the debugging process, see The CRT debug heap.

This function validates its parameter. If memblock is a NULL pointer, _msize invokes an invalid parameter handler, as described in Parameter validation. If the error is handled, the function sets errno to EINVAL and returns -1 (18,446,744,073,709,551,615 unsigned).

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine Required header
_msize <malloc.h>

For more compatibility information, see Compatibility.

Libraries

All versions of the C run-time libraries.

Example

See the example for realloc.

See also

Memory allocation
calloc
_expand
malloc
realloc