如何检查X服务器是否正在运行?

问题描述

有没有办法找出当前会话用户是否正在运行Xserver(在Linux下)?

Is there any way to find out if the current session user is running an Xserver (under Linux) ?

我从以下事情开始:

ps -e | grep X

但这并不总是有效

我尝试的另一件事是检查$DISPLAY变量

and one more thing I tried is checking the $DISPLAY variable

还有其他方法可以检查吗?

Are there any other ways to check this?

有人建议使用$ DISPLAY变量，但是如果用户摆弄这个变量怎么办?如果他尝试执行某项操作并更改此变量，然后在我进行检查时，该变量不再反映系统的准确状态，该怎么办?没有特定的方法可以始终返回正确答案吗?

Some people suggested using the $DISPLAY variables but what if the user fiddles with this variable ? what if he tries to do something and changes this variable and then when I check it, it no longer reflects an accurate state of the system.Is there no specific way to do this that will always return a correct answer ?

我发现它可以通过编程方式完成:

I found that it can be done programatically thus:

#include <X11/Xlib.h>
int main()
    { exit(XOpenDisplay(NULL) ? 0 : 1);  }

$ gcc -o xprobe xprobe.c -L/usr/X11R6/lib -lX11

但是我正在寻找一种脚本方式.

But I am looking for a script way.

推荐答案

我经常需要在运行许多X服务器的服务器上运行X命令，因此基于ps的答案不起作用.自然，必须适当设置$DISPLAY.要检查其是否有效，请在某些片段中使用xset q，例如:

I often need to run an X command on a server that is running many X servers, so the ps based answers do not work. Naturally, $DISPLAY has to be set appropriately. To check that that is valid, use xset q in some fragment like:

if ! xset q &>/dev/null; then
    echo "No X server at \$DISPLAY [$DISPLAY]" >&2
    exit 1
fi

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