public void Set(UIntPtr start, long length, Protection prot)
{
if ((ulong)start < (ulong)Start)
{
throw new ArgumentOutOfRangeException("start");
}
if ((ulong)start + (ulong)length > (ulong)End)
{
throw new ArgumentOutOfRangeException("length");
}
#if !MONO
Kernel32.MemoryProtection p;
switch (prot)
{
case Protection.None: p = Kernel32.MemoryProtection.NOACCESS; break;
case Protection.R: p = Kernel32.MemoryProtection.READONLY; break;
case Protection.RW: p = Kernel32.MemoryProtection.READWRITE; break;
case Protection.RX: p = Kernel32.MemoryProtection.EXECUTE_READ; break;
default: throw new ArgumentOutOfRangeException("prot");
}
Kernel32.MemoryProtection old;
if (!Kernel32.VirtualProtect(start, (UIntPtr)length, p, out old))
{
throw new InvalidOperationException("VirtualProtect() returned FALSE!");
}
#else
LibC.ProtType p;
switch (prot)
{
case Protection.None: p = 0; break;
case Protection.R: p = LibC.ProtType.PROT_READ; break;
case Protection.RW: p = LibC.ProtType.PROT_READ | LibC.ProtType.PROT_WRITE; break;
case Protection.RX: p = LibC.ProtType.PROT_READ | LibC.ProtType.PROT_EXEC; break;
default: throw new ArgumentOutOfRangeException("prot");
}
ulong end = (ulong)start + (ulong)length;
ulong newstart = (ulong)start & ~((ulong)Environment.SystemPageSize - 1);
if (LibC.mprotect((UIntPtr)newstart, (UIntPtr)(end - newstart), p) != 0)
{
throw new InvalidOperationException("mprotect() returned -1!");
}
#endif
}