无法写入命名管道 [英] Can't write to named pipe

问题描述

我试图写一个命名管道，是 mkfifo子进行。但是，当我运行命令，（前） LS＆GT; myNamedPipe ，我不能再输入命令进入庆典。我仍然可以写人物，这就是pretty多了。

I'm trying to write to a named pipe, made with mkfifo. But when I run the command, (ex) ls > myNamedPipe, I can no longer enter commands into the bash. I can still write characters and that's pretty much it.

推荐答案

一个命名管道保持打开状态，直到你从别的地方读它。这是为了允许不同进程之间的通信。

A named pipe remains opened until you read it from some other place. This is to permit communication between different processes.

尝试：

mkfifo fifo
echo "foo" > fifo

然后打开另一个终端，输入：

Then open another terminal and type:

cat fifo

如果您返回到您第一终端，你会发现，你现在就可以输入其他命令。

If you return to you first terminal, you'll notice that you can now enter other commands.

另见什么与反向happends：

See also what happends with the reverse :

# terminal 1
cat fifo

# terminal 2
echo "foo" > fifo

# and now you can see "foo" on terminal 1

如果你想你的终端不尝试写一些东西到FIFO时，附加到FIFO文件描述符上挂起：

If you want you terminal not to "hang on" when trying to write something to the fifo, attach to the fifo a file descriptor :

mkfifo fifo
exec 3<> fifo
echo "foo" > fifo
echo "bar" > fifo

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