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从Linux服务启动GTK＃应用程序

[英]Launch a GTK# application from a Linux service

原文 2011-11-21 18:52:51 4 1 c#/ linux/ mono/ gtk#

Environment : 环境：
RHEL 5.7, 64-bit RHEL 5.7，64位
runlevel 5 运行级别5
mono 2.6.7 单声道2.6.7

I have a C# console application that is run as a service on startup. 我有一个C＃控制台应用程序，它在启动时作为服务运行。 From that application's code, it launches two processes that are also C# applications. 通过该应用程序的代码，它启动两个也是C＃应用程序的进程。 One is another console app, and one is a GTK application (but is set to not show its GUI window). 一个是另一个控制台应用程序，一个是GTK应用程序（但设置为不显示其GUI窗口）。

Running this main app normally (mono app.exe) works fine. 正常运行此主应用程序（mono app.exe）可以正常运行。 However, when running it as a service, the GTK application crashes at Application.Init() with a "GTK-cannot open display" error message. 但是，当将其作为服务运行时，GTK应用程序在Application.Init（）处崩溃，并显示“ GTK-无法打开显示”错误消息。

That error message is also what we see when we try directly running the GTK app (aka "mono appname.exe") in runlevel 3 (assuming because Application.Init() does something with the window manager that is not there). 当我们尝试在运行级别3中直接运行GTK应用程序（也称为“ mono appname.exe”）时，也看到了该错误消息（假设因为Application.Init（）对不存在的窗口管理器做了一些操作）。 So does a linux service somehow start in runlevel 3, even though we start the machine in runlevel 5? 那么，即使我们在运行级别5中启动计算机，Linux服务也是否会以某种方式在运行级别3中启动？ And if so, is there a way I can force it to run at runlevel 5? 如果是这样，是否有办法强制我使其在运行级别5运行？

Thank you. 谢谢。

EDIT - more information: The GTK application is set up so that it can run with or without launching its GUI via a command line parameter. 编辑-更多信息：GTK应用程序已设置为可以通过命令行参数在启动或不启动GUI的情况下运行。 However, we are using Gtk.Application.Run() to start the application from main no matter which way it's running. 但是，无论使用哪种方式运行，我们都使用Gtk.Application.Run（）从main启动应用程序。 Gtk.Application.Init() must be called before Gtk.Application.Run(), and it tries to do something with the x server - which obviously causes a problem in runlevel 3. However, our machine will always be started in runlevel 5. 必须在Gtk.Application.Run（）之前调用Gtk.Application.Init（），并且它会尝试使用x服务器执行某些操作-这显然会导致运行级别3出现问题。但是，我们的计算机始终会在运行级别5中启动。

The main app that launches the other two is setup as a service because the overall system it's going on requires it to start as a service at boot time. 启动其他两个应用程序的主应用程序设置为服务，因为正在运行的整个系统要求它在引导时作为服务启动。 So, is there a way to run it in a user-interactive mode? 那么，有没有办法在用户交互模式下运行它？ (even though they won't actually be interacting with it directly) （即使他们实际上不会直接与其进行交互）

1 个解决方案

You are not going to be able to do this easily without dividing your program into two or more parts. 如果不将程序分为两个或更多部分，您将无法轻松地执行此操作。

When started as a service during boot your program will either be running as root or another nominated user. 在启动过程中作为服务启动时，您的程序将以root或其他指定用户身份运行。 It will not have an associated X session ( X may not have started either ). 它将没有关联的X会话（X也可能没有开始）。

When the GTK main loop (via Application.Init) starts it tries to contact the X server which it wont be able to find or if it does may not have permission to use. 当GTK主循环（通过Application.Init）启动时，它将尝试联系无法找到的X服务器，或者可能没有使用权限。

You should split your program into a background service and a GUI, cramming the two in the same thing has development drawbacks aswell. 您应该将程序拆分为后台服务和GUI，将两者混为一谈也存在开发缺陷。

Also, presumably, your service has some sort of client program? 另外，大概您的服务有某种客户端程序？ Why can your GUI not be a client also and launched separately? 为什么您的GUI也不能同时作为客户端并单独启动？