There's no need to print error messages for this case since file descriptors 0 through 2 are only closed if an attacker is trying to subvert your program.

在这种情况下不需要输出错误消息，因为文件描述符 0 到 2 只是在攻击者试图去搅乱您的程序的时候才会被关闭。

youdao

For example, we will be able to direct only critical error messages to the log file (to save disk space), while still being able to print all of the log messages on the console.

例如，我们可以仅指示存储致命错误消息到日志文件(存储到硬盘)，然而仍然可以在控制台打印所有消息。

youdao

Is it an error if you print a document, only to find that no printers are connected?

如果你在打印一个文档，却发现没有连接打印机，这是个错误吗？

youdao