注销时 bash 如何处理作业？

发布于 2024-10-04 15:52:46 字数 475 浏览 3 评论 0原文

据我从书籍和 bash 手册中了解到的就是这样。当用户从 bash 注销时，如果用户没有使用 nohup 或 disown，则该用户启动的所有后台作业都将自动终止。但今天我测试了它：

登录到我的 gnome 桌面并访问 gnome-terminal。
终端中有两个选项卡，在一个选项卡中我创建了一个名为 test 的新用户并以 test 身份登录
```
su - 测试
```

身份登录并启动了一个脚本。

cat test.sh
#!/bin/bash
睡眠 60
printf“你好世界！！”
出口0


./test.sh &

之后，我退出测试并关闭选项卡
在下一个选项卡中，我以 root 身份执行 ps aux ，发现作业仍在运行。

这是怎么回事？

原文

As far as I understood from the books and bash manuals is that. When a user logs out from bash all the background jobs that is started by the user will automatically terminate, if he is not using nohup or disown. But today I tested it :

Logged in to my gnome desktop and accessed gnome-terminal.
There are two tabs in the terminal and in one I created a new user called test and logged in as test
```
su - test
```

started a script.

cat test.sh
#!/bin/bash
sleep 60
printf "hello world!!"
exit 0


./test.sh &

After that I logged out of test and closed the tab
In the next tab I exected ps aux as root and found that job is still running.

How this is happening ?

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旧城烟雨 2024-10-11 15:52:46

正在运行的后台作业是否在退出时终止取决于 shell。 Bash 通常不会执行此操作，但可以配置为登录 shell (shopt -s huponexit)。无论如何，在控制进程（例如登录 shell）终止后，就不可能访问 tty。

总是导致 SIGHUP 的情况包括：

tty 关闭时前台中的任何内容。
任何后台作业，包括在 shell 终止时停止的进程（SIGCONT 和 SIGHUP）。 shell 通常会在发生这种情况之前警告您。

huponexit 摘要：

开启：当 shell 退出时，后台作业将通过 SIGHUP 终止
```
$ shopt -s huponexit
$ 购物 huponexit
胡波退出
```
关：当 shell 退出时，后台作业不会通过 SIGHUP 终止.
```
$ shopt -u huponexit
$ 购物 huponexit
huponexit 关闭
```

Whether running background jobs are terminated on exit depends on the shell. Bash normally does not do this, but can be configured to for login shells (shopt -s huponexit). In any case, access to the tty is impossible after the controlling process (such as a login shell) has terminated.

Situations that do always cause SIGHUP include:

Anything in foreground when the tty is closed down.
Any background job that includes stopped processes when their shell terminates (SIGCONT and SIGHUP). Shells typically warn you before letting this happen.

huponexit summary:

On: Background jobs will be terminated with SIGHUP when shell exits
```
$ shopt -s huponexit
$ shopt huponexit
huponexit       on
```
Off: Background jobs will NOT be terminated with SIGHUP when shell exits.
```
$ shopt -u huponexit
$ shopt huponexit
huponexit       off
```

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