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The latest version of this topic can be found at _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.
Requirements
| Routine | Required header |
|---|---|
_msize |
<malloc.h> |
For more compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
Example
See the example for realloc.
.NET Framework Equivalent
Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.