Function wrapFdOp

src/worker.js:580–588

(name, orig, fdArgIdx = 0)

    
    // Intercept fd operations to redirect fake directory fds
    const wrapFdOp = (name, orig, fdArgIdx = 0) => {
        return (...args) => {
            const fd = args[fdArgIdx];
            if (fakeFdMap.has(fd)) {
                args[fdArgIdx] = fakeFdMap.get(fd);
            }
            return orig(...args);
        };
    };
    
    // Custom fd_readdir for our directory handles
    const origFdReaddir = wasiImport.fd_readdir;