API Types

Architecture Independent API Types

Architecture Dependent API Types

API Type	.NET Type
size_t	System.IntPtr
ssize_t	System.IntPtr

Strictly speaking, ssize_t is the signed version of size_t, and would be System.Int32 or System.Int64 on 32-bit or 64-bit architectures, respectively. In order to support AnyCPU builds, representing both as System.IntPtr seems to be worth the inconvenience of having to convert pointers to integers. (And the number of API calls with ssize_t arguments or returns is rather small.)