aligned memory allocation
valloc() function is obsoleted by the current version of malloc(3), which aligns page-sized and larger allocations and both aligned_alloc(3) and posix_memalign(3), which allocate memory with a given alignment.
function allocates size bytes aligned on a page
boundary. It is implemented by calling
with a slightly larger request, saving the true beginning of the block
allocated, and returning a properly aligned pointer.
valloc() function returns a pointer to
the allocated space if successful; otherwise a null pointer is returned.
valloc() function appeared in
vfree() function has not been