如果没有$ DISPLAY的X11，则无法自动启动dbus守护程序. NetBeans. Pi作为远程主机 [英] Unable to autolaunch a dbus-daemon without a $DISPLAY for X11. NetBeans. Pi as remote host

问题描述

我正在尝试使用NetBeans IDE运行以下示例代码:

I am trying to run the following example code using my NetBeans IDE:

    #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dbus/dbus.h>

int main() {
    DBusConnection *connection = NULL;
    DBusError error;
    char buffer[1024];

    dbus_error_init(&error);
    connection = dbus_bus_get(DBUS_BUS_SESSION, &error);
    if (dbus_error_is_set(&error)) {
        fprintf(stderr, "%s", error.message);
        abort();
    }

    puts("This is my unique name");
    puts(dbus_bus_get_unique_name(connection));
    fgets(buffer, sizeof(buffer), stdin);

    return 0;
}

从一个出色的教程中: 使用低级的DBUS教程API

From an excellent tutorial: DBUS TUTORIAL USING THE LOW-LEVEL API

我为SSH设置了无头Pi设置，并安装了所有用于dbus开发的必需库.

I have my headless Pi setup for SSH and have installed all the necessary libraries for dbus development.

但是，在netbeans中运行程序时，出现以下错误

however, when running the program in netbeans i receive the following error

在X11上没有$ DISPLAY的情况下无法自动启动dbus守护程序

Unable to autolaunch a dbus-daemon without a $DISPLAY for X11

/usr/bin/dbus-launch异常终止，出现以下错误:自动启动错误:X11初始化失败.

/usr/bin/dbus-launch terminated abnormally with the following error: Autolaunch error: X11 initialization failed.

请注意，我在Netbeans的远程主机属性中启用了X11转发

note that i have X11 forwarding enabled in my remote host properties on Netbeans

我可以看到，如果我本人和 回声$ DISPLAY 这将不返回任何内容，为空.

I can see that, if I SSH into the Pi myself and echo $DISPLAY this returns nothing, empty.

到目前为止，我已经尝试过:

So far, i have tried:

in /etc/ssh/sshd_config 
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost no
AllowTcpForwarding yes

没有用.

试图将运行环境变量设置为

tried setting a run environment variable to

DISPLAY export DISPLAY=$HOSTNAME:0.0

0x212d0 "org.freedesktop.DBus.Error.Spawn.ExecFailed"
0x21fe8 "/usr/bin/dbus-launch terminated abnormally with the following error: Autolaunch error: X11 initialization failed.\\n"

没有工作.

尝试

In /etc/ssh/ssh_config
ForwardX11 yes

没有用.

是否需要为X11设置Pi设置或配置netbeans环境以使用某些参数运行程序?

Is it a case of getting my Pi setup for X11 or configuring my netbeans environment to run the program with certain parameters?

预先感谢您的任何建议.

Thank you in advance for any advice.

更新2017年8月30日:

我重新安装了debian，并遵循Gilles的回答:

I did a fresh install of debian and followed Gilles' answer:

https://unix .stackexchange.com/questions/12755/如何远程转发x-over-ssh-to-run-graphics-applications ...

我可以确认: 在/etc/ssh/sshd_config中 X11Forwarding yes X11DisplayOffset 10 ...

I can confirm: in /etc/ssh/sshd_config X11Forwarding yes X11DisplayOffset 10...

xauth已安装在远程Pi上.

xauth is installed on the remote Pi.

我已经在客户端Mac上安装了XQuartz.使用ssh -X pi @ IPaddress时，xquartz打开，如果远程Pi上的我echo $DISPLAY我得到localhost:12.0 ...，则数字随每个终端而变化.

I have installed XQuartz on my client mac. Upon ssh -X pi@IPaddress, xquartz opens and if i echo $DISPLAY on the remote Pi i get localhost:12.0 ... the number changes with each terminal.

当前，如果使用以下方法在netbeans中错误地设置了项目环境:

Currently, if have incorrectly set the project environment in netbeans with:

DISPLAY = localhost:11.0(这是错误的，因为该数字随与远程Pi的每个ssh连接的变化而变化).

DISPLAY=localhost:11.0 (this is wrong because the number changes with each ssh connection to the remote Pi).

因此，当我尝试运行该程序时，NetBeans将挂起，并且我也无法调试.

So when i try to run the program, NetBeans will hang and i cant debug either.

现阶段我的问题是，如何为NetBeans正确设置DISPLAY Environment，以便每次它与远程Pi建立SSH连接并请求X11转发时，它将具有正确的$ DISPLAY?

My question at this stage is, how do i set the DISPLAY Environment correctly for NetBeans so that each time it makes an SSH connection to the remote Pi and requests X11 forwarding, it will have the correct $DISPLAY?

推荐答案

仅在X11会话下才能自动启动dbus-daemon.否则将其禁用，因为无法让不同的应用程序建立dbus守护程序的通用实例.

Autolaunch of dbus-daemon only works when under an X11 session. It is otherwise disabled because there's no way for different applications to establish a common instance of the dbus daemon.

如果要独立于X11在pi盒上运行dbus守护程序，则可能应将其配置为在启动时启动dbus守护程序，然后将总线地址导出到 DBUS_SESSION_BUS_ADDRESS环境变量.

If you want to run a dbus daemon on your pi box independently of X11, you probably should configure it to launch the dbus daemon on startup, and export the bus address in DBUS_SESSION_BUS_ADDRESS environment variable.

有关更多信息，请参见 https://bugs.debian.org /cgi-bin/bugreport.cgi?bug=690530

For more info see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=690530

另一方面，如果您想使用远程X会话，则需要修复配置错误的X11转发，以便在ssh进入Pi时正确设置DISPLAY环境变量.参见例如 https://unix. stackexchange.com/questions/12755/如何远程转发x-over-ssh-to-run-graphics-applications .

If on the other hand you want to use your remote X session, you need to fix your misconfigured X11 forwarding such that the DISPLAY environment variable is set correctly when you ssh into the Pi. See e.g https://unix.stackexchange.com/questions/12755/how-to-forward-x-over-ssh-to-run-graphics-applications-remotely .

这篇关于如果没有$ DISPLAY的X11，则无法自动启动dbus守护程序. NetBeans. Pi作为远程主机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！