如何从脚本发出一个信号SIGINT脚本？ BASH [英] How to send a signal SIGINT from script to script ? BASH

问题描述

我要捕获的信号从Script-A.sh发送到Script-B.sh
所以在Script-A.sh我用命令

  

（SIGINT发送到Script-B.sh）结果
  杀-2 $ PID_Script-B.sh

而在Script-B.sh我捕捉信号和通话功能的清洁

  

陷阱'干净'2

这是不行的，而不是Script-B.sh被立即杀死，而不执行干净！

我也注意到的是，如果我想从终端发送SIGINT到捕获它的任何脚本，一个 CTRL-C 将正确逮住，但如果我通过命令指定信号杀-2 $ pid_of_script

有关这两个方法之间的差异发送SIGINT任何想法（ CTRL-C VS 杀-2 $ pid_of_script ），以及如何从一个脚本发送SIGINT到另一个？

问候，

调试

解决方案

我能够重现您报告的行为。我的假设是因为脚本运行的的从的一个非交互的shell（为脚本的孩子）的 SIGINT ，这是一个键盘信号，将被忽略。

从信息庆典：

  

后台进程是那些进程组ID从不同
         终端的;这样的过程是免疫的键盘产生的信号。

我发现，如果你陷阱和杀使用另一种信号，如 SIGUSR1 它的工作原理。

从男人庆典信息

  

被Bash运行非内置命令必须设置为从父外壳继承的值信号处理程序。当作业控制不生效，异步命令忽略SIGINT和SIGQUIT除了这些继承处理。

和

  

如果bash等待命令完成并接收其陷阱已设置的信号，陷阱将不会被直到命令完成执行。
  

和

  

在SIGCHLD任何陷阱为每个孩子退出执行。

I want to trap a signal send from Script-A.sh to Script-B.sh so in Script-A.sh i use the command

(Send SIGINT to Script-B.sh)
kill -2 $PID_Script-B.sh

And in Script-B.sh i catch the signal and call function Clean

trap 'Clean' 2

It does not work, instead the Script-B.sh is killed right away without performing the Clean !!

What i notice also is that if i want to send SIGINT from terminal to any script that traps it, a ctrl-c will be catched correctly, but not if i specify the signal via the command kill -2 $pid_of_script

Any idea about the difference between the two method to send the SIGINT (ctrl-c VS kill -2 $pid_of_script), and how i can send a SIGINT from a script to another ?

Regards,

Debugger

解决方案

I was able to reproduce the behavior you report. My hypothesis is that since the script is running from a non-interactive shell (as a child of a script) that SIGINT, which is a keyboard signal, is ignored.

From info bash:

Background processes are those whose process group ID differs from the terminal's; such processes are immune to keyboard-generated signals.

I have found that if you trap and kill using another signal such as SIGUSR1 it works.

Additional information from man bash:

Non-builtin commands run by bash have signal handlers set to the values inherited by the shell from its parent. When job control is not in effect, asynchronous commands ignore SIGINT and SIGQUIT in addition to these inherited handlers.

and

If bash is waiting for a command to complete and receives a signal for which a trap has been set, the trap will not be executed until the command completes.

and

Any trap on SIGCHLD is executed for each child that exits.

这篇关于如何从脚本发出一个信号SIGINT脚本？ BASH的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！