Function read

lib/internal/vfs/setup.js:417–422

(fd, buffer, offset, length, position)

      return vfd.entry.close().then(() => { closeVirtualFd(fd); return true; });
    },
    read(fd, buffer, offset, length, position) {
      const vfd = getVirtualFd(fd);
      if (!vfd) return undefined;
      return vfd.entry.read(buffer, offset, length, position)
        .then(({ bytesRead }) => bytesRead);
    },
    write(fd, buffer, offset, length, position) {
      const vfd = getVirtualFd(fd);
      if (!vfd) return undefined;