SoInput(3) on Linux
The text d6fd7fe8111a, as Debian 6.0 (Squeeze) shipped it.
The SoInput class is an abstraction of file import functionality. This class takes care of most of the chores of doing data import in Coin. It puts a layer of abstraction over the read operations to make it transparent for the rest of the Coin code whether or not we're reading from a file, from a memory buffer or from stdin.