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在Linux下的Python/GTK中检测用户注销/关闭-未收到SIGTERM/HUP

sigterm pygtk gtk linux python

6

Ivo Wetzel · 技术社区 · 16 年前

好吧,这可能是一个困难的问题,我有一个pyGTK应用程序,它由于X窗口错误而随机崩溃,我无法捕获/控制。

因此,我创建了一个包装器,它在检测到崩溃时立即重新启动应用程序,现在问题来了,当用户注销或关闭系统时,应用程序将以状态1退出。但是在某些X错误时,它也会这样做。

import pygtk
import gtk
import sys


class Test(gtk.Window):
    def delete_event(self, widget, event, data=None):
        open("delete_event", "wb")

    def destroy_event(self, widget, data=None):
        open("destroy_event", "wb")

    def destroy_event2(self, widget, event, data=None):
        open("destroy_event2", "wb")

    def __init__(self):
        gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL)
        self.show()
        self.connect("delete_event", self.delete_event)
        self.connect("destroy", self.destroy_event)
        self.connect("destroy-event", self.destroy_event2)      

def foo():
    open("add_event", "wb")

def ex():
    open("sys_event", "wb")


from signal import *
def clean(sig):
    f = open("sig_event", "wb")
    f.write(str(sig))
    f.close()
    exit(0)

for sig in (SIGABRT, SIGILL, SIGINT, SIGSEGV, SIGTERM):
    signal(sig, lambda *args: clean(sig))


def at():
    open("at_event", "wb")

import atexit
atexit.register(at)

f = Test()
sys.exitfunc = ex
gtk.quit_add(gtk.main_level(), foo)

gtk.main()
open("exit_event", "wb")

没有一个成功,有没有低水平的方法来检测系统关闭?谷歌没有发现任何与此相关的信息。

编辑:

我创建了这个shell脚本:

#!/bin/bash


trap test_term TERM
trap test_hup HUP


test_term(){
    echo "teeeeeeeeeerm" >~/Desktop/term.info
    exit 0
}

test_hup(){
    echo "huuuuuuuuuuup" >~/Desktop/hup.info
    exit 1
}

while [ true ]
do
    echo "idle..."
    sleep 2
done

并创建了一个.desktop文件来运行它:

[Desktop Entry]
Name=Kittens
GenericName=Kittens
Comment=Kitten Script
Exec=kittens
StartupNotify=true
Terminal=false
Encoding=UTF-8
Type=Application
Categories=Network;GTK;
Name[de_DE]=Kittens

通常,这应该在注销时创建术语文件,并在用&启动时创建hup文件;。但不是在我的系统里。GDM根本不关心脚本,当我重新登录时,它仍然在运行。

我也试过用 shopt -s huponexit

编辑2:
这里还有一些关于真实代码的更多信息,整个过程如下:

Wrapper Script, that catches errors and restarts the programm
    -> Main Programm with GTK Mainloop
        -> Background Updater Thread

Start Wrapper
-> enter restart loop
    while restarts < max:
        -> start program
            -> check return code
                -> write error to file or exit the wrapper on 0

现在关机了, start program 返回1。这意味着要么它没有启动,要么父进程终止,主要问题是要找出这两个进程中哪一个刚刚发生。 X错误也会导致1。在shell脚本中陷进去不起作用。

如果您想查看实际代码,请访问GitHub:
http://github.com/BonsaiDen/Atarashii

2 回复 | 直到 16 年前

1

2

Ivo Wetzel 16 年前

好吧,我终于找到了解决办法:)

在这种情况下,你根本不能依赖信号。您必须连接到桌面会话才能得到注销即将发生的通知。

import gnome.ui

gnome.program_init('Program', self.version) # This is going to trigger a warning that program name has been set twice, you can ignore this, it seems to be a problem with a recent version of glib, the warning is all over the place out there
client = gnome.ui.master_client() # connect us to gnome session manager, we need to init the program before this
client.connect('save-yourself', self.on_logout) # This gets called when the user confirms the logout/shutdown
client.connect('shutdown-cancelled', self.on_logout_cancel) # This gets called when the logout/shutdown is canceled
client.connect('die', self.on_logout) # Don't know when this gets called it never got in my tests

def on_logout(self, *args):
    # save settings an create a file that tells the wrapper that we have exited correctly!
    # we'll still return with status code 1, but that's just gtk crashing somehow

def on_logout_cancel(self, *args):
    # simply delete the logout file if it exists

on_logout ,如果您这样做,GNOME将不会识别出您的程序已经退出,并将给您一些程序仍在运行的对话框。

2

0

nosklo 16 年前

你忘了关闭gtk的事件循环。

0 关闭窗口时:

import gtk

class Test(gtk.Window):
    def destroy_event(self, widget, data=None):
        gtk.main_quit()

    def __init__(self):
        gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL)
        self.connect("destroy", self.destroy_event)
        self.show()

f = Test()
gtk.main()

编辑: 下面是捕获SIGTERM信号的代码:

import signal

def handler(signum, frame):
    print 'Signal handler called with signal', signum
    print 'Finalizing main loop'
    gtk.main_quit()

signal.signal(signal.SIGTERM, handler)

其余的代码与上面的完全一样,没有变化。我发邮件的时候它在这里工作 SIGTERM 0