Allocates a block of memory via g_slice_alloc() and initializes
the returned memory to 0. Note that the underlying slice allocation
mechanism can be changed with the [G_SLICE=always-malloc][G_SLICE]
environment variable.
Available since: 2.10
Parameters
block_size
Type:gsize
The number of bytes to allocate.
Return value
Type:gpointer
A pointer to the allocated block, which will be NULL if and only
if mem_size is 0