pub type PopenHook = fn(cmd: &[u8], mode: &[u8]) -> Result<Box<dyn LuaFileHandle>, LuaError>;Expand description
Function-pointer signature for spawning a child process with a connected
pipe, installed on GlobalState::popen_hook by the embedder.
std::process::Command is banned outside lua-cli, so lua-stdlib’s
io.popen reaches the OS through this hook. None causes io.popen to
raise a clean Lua error (“popen not enabled in this build”), which is
appropriate for sandboxed embeddings.
mode is the Lua popen mode string — b"r" for reading the child’s
stdout, b"w" for writing to the child’s stdin.