如何在不关闭管道的情况下通过管道发送文件结束? [英] How to send end-of-file through a pipe without closing the pipe?

问题描述

当我打开运行bash的终端并输入以下内容时:

When I open a terminal running bash and type the following:

cat\nfoo\n^Decho bar\n

(输入\ n且^ D为control-d)我得到:

(where \n is enter and ^D is control-d) I get:

foo
bar

即，^ D导致cat退出，但我仍然可以输入更多内容.
我该如何通过C中的(unix)管道发送相同的输入(特别是文件结尾)?

Ie, ^D causes cat to exit, but I can still type more.
How would I send the same input (specifically the end-of-file) through a (unix) pipe in C?

推荐答案

xterm不会通过pipe(7)与shell和实用程序一起执行其输入.而是使用Unix PTY框架(有关某些信息，请参见pty(7)，openpty(3)，forkpty(3)，posix_openpt(3)，pts(4)联机帮助页). PTY框架允许任何进程充当终端主机"(例如，telnetd(8)，sshd(8)，xterm(1)等)，并且任何进程都可以连接到终端从机以提供交互式环境，就像坐在控制台.

xterm does not perform its input with the shell and utilities via pipe(7)s. Instead, it uses the Unix PTY framework (see pty(7), openpty(3), forkpty(3), posix_openpt(3), pts(4) manpages for some information). The PTY framework allows any process to serve as a terminal "master" (e.g., telnetd(8), sshd(8), xterm(1), etc.) and any process can connect to the terminal slave to provide an interactive environment just like sitting at the console.

Unix环境中的高级编程，第二版 rads.stackoverflow.com/amzn/click/com/0201433079"rel =" noreferrer"rel =" nofollow noreferrer>史蒂文斯和拉格一个优秀的小型pty程序，它允许以类似于expect(1)的方式来驱动交互式"程序，但是使用C而不是tcl.

The Advanced Programming in the Unix Environment, 2nd edition book by Stevens and Rago has an excellent chapter on using pseudo-terminal devices to control slave programs -- including an excellent little pty program that allows driving "interactive" programs in a manner similar to expect(1), but in C rather than tcl.

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