mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-11-13 20:27:29 -05:00
29 lines
1.1 KiB
Markdown
29 lines
1.1 KiB
Markdown
|
---
|
||
|
|
title: "Handling Background Processes in Bash"
|
||
|
|
date: 2019-06-17T19:50:30-04:00
|
||
|
|
draft: false
|
||
|
|
---
|
||
|
|
|
||
|
|
For multi-process applications, I want to be able to start it up using the `bash` command processor and be able to stop all the processes just by hitting `CTRL-C`.
|
||
|
|
|
||
|
|
As a quick reminder, to have a task run in the background you need to add a `&` at the end of the line.
|
||
|
|
|
||
|
|
```bash
|
||
|
|
execute_app &
|
||
|
|
```
|
||
|
|
|
||
|
|
Previously, I was grabbing the PID of this background process, trapping the interrupt signal and taking the time to send the interrupt signal to all of the background processes.
|
||
|
|
|
||
|
|
You can get the child pid by referencing the variable `$!` after sending a process to the background.
|
||
|
|
|
||
|
|
Now I just use `setsid` to set the process group of the background processes to be the same as the bash process itself. The following demo script here will show the capability.
|
||
|
|
|
||
|
|
```bash
|
||
|
|
#!/bin/bash
|
||
|
|
setsid sleep 5 &
|
||
|
|
setsid sleep 10 &
|
||
|
|
wait
|
||
|
|
```
|
||
|
|
|
||
|
|
This script will send two processes to the background and will wait until all the processes are finished. Hitting `CTRL-C` during execution will send the interrupt signal to all of the processes achieving my goal.
|