The
posix_memalign() function allocates
size bytes of memory such that the allocation's base address is an even multiple of
alignment, and returns the allocation in the value pointed to by
ptr.
The requested
alignment must be a power of 2 at least as large as
sizeof(
void *).
Memory that is allocated via
posix_memalign() can be used as an argument in subsequent calls to
realloc(3) and
free(3).