将SIGINT从键盘发送到bash中的管道命令 [英] Sending SIGINT from keyboard to piped commands in bash

问题描述

如果在bash中我在命令行上运行a | b | c | d，然后按 ^ C ，哪个进程会收到信号?

If in bash I run a | b | c | d on the command line and then press ^C, which process gets the signal?

推荐答案

简而言之，它们都可以.

In short, they all do.

设置管道时，外壳程序会创建 流程组 .内核的行规将 ^ C 解释为用户请求中断当前在前台运行的进程组的请求.向进程组发送诸如SIGINT之类的信号会自动将该信号传递给该组中的所有进程.

When setting up a pipeline, the shell creates a process group. ^C is interpreted by the kernel's line discipline as the user's request to interrupt the process group currently running in the foreground. Sending a signal such as SIGINT to a process group automatically delivers the signal to all processes in the group.

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