extern static int mprotect(IntPtr addr, IntPtr len, mprot prot);
public static int MemoryProtection(IntPtr ptr, long length, mprot prot)
{
long start = ptr.ToInt64() % pagesize;
long size = pagesize - start;
var page = new IntPtr(ptr.ToInt64() - start);
int i;
for (i = 1; length - size > pagesize * i; i++);
if (mprotect(page, (IntPtr)(pagesize * i), prot) < 0) {
return -1;
}
return i;
}