Function fstat

lib/internal/vfs/setup.js:429–433

(fd, options)

        .then(({ bytesWritten }) => bytesWritten);
    },
    fstat(fd, options) {
      const vfd = getVirtualFd(fd);
      if (!vfd) return undefined;
      return vfd.entry.stat(options);
    },
    ftruncate(fd, len) {
      const vfd = getVirtualFd(fd);
      if (!vfd) return undefined;