Function ftruncateSync

lib/internal/vfs/setup.js:373–377

(fd, len)

      return undefined;
    },
    ftruncateSync(fd, len) {
      const vfd = getVirtualFd(fd);
      if (vfd) { vfd.entry.truncateSync(len); return true; }
      return undefined;
    },
    fchmodSync: noopFdSync,
    fchownSync: noopFdSync,
    futimesSync: noopFdSync,