C implementation of Io's System object — a slot-only object (no dedicated data pointer or tag) that exposes VM- and environment-level hooks: process exit, errno string, env var get/set, platform name, sleep, symbol table, lobby root, and GC recycler tuning. Under WASI the host-provided surface is minimal: daemon and system() raise errors, thisProcessPid is always 1, activeCpus is 1, and platform/ platformVersion return "wasm"/"wasi-0.1". IO_VERSION_STRING and INSTALL_PREFIX are stamped onto System as slots in IoSystem_proto so Io code can query the build identity.
Stub for the historical daemonize call. WASI has no fork/setsid so the method always raises an Io exception. Kept for source compatibility with the standard library.
Blocks the current thread for the requested number of seconds by chunking into sub-second usleep calls (usleep's POSIX argument must be less than 1,000,000). Under WASM this is a real synchronous pause, since there is no scheduler to yield to — long sleeps stall the whole runtime.
Stub for the historical system(3) shell bridge. WASI has no process creation so the method always raises an Io exception — preserved as a method so calling Io code can catch a consistent error rather than a slot-not-found.
Constructs the singleton System object: installs the method table and stamps version / installPrefix / type slots derived from compile-time macros (IO_VERSION_STRING, INSTALL_PREFIX). There is no proto registration — System is accessed by name from the lobby rather than via IoState_protoWithId_, and there is nothing to clone.