2009年2月22日星期日

xserver-xephyr

Xephyr 是一个 Xnest 的替代产品,因为 Xnest 不提供现代 X server 的一些高级特性,比如图形加速的支持。简而言之,Xephyr 是一个 X server,但是它执行在一个存在的 X server 里面,这个可以用来做很多事情,比如需要通过 XDMCP 连接到另外一台主机,那么不需要另外打开一个新的 X server;又比如正在写一个 window manager,那么在一个 X server 里面打开的 X server 里面调试,将会比直接在现有的 X server 里面替换现有的 window manager 方便很多。对于热衷于更换自己的 window manager 的狂热爱好者,Xephyr 提供了绝佳的试验环境。

x.org 的 Xephyr 带有下面的东西,
/usr/share/doc/xserver-xephyr/README
/usr/share/doc/xserver-xephyr/copyright
/usr/share/doc/xserver-xephyr/changelog.gz
/usr/share/doc/xserver-xephyr/changelog.Debian.gz
/usr/bin/Xephyr
我们可以直接运行 -help 获得帮助,基本的使用方式是 Xephyr :n -options。这里 :n 是 DISPLAY 的值,Xephyr 本身是一个 X client,也是一个 X server,它是 client 通过环境变量 DISPLAY 设置显示的 X server,这里的 :n 指定的是它作为 X server 的序号,也就是说 X client 可以通过 -display 或者更改环境变量。我们这里简单介绍一些其他的参数,如 -query 和 -indirect 可以用来向打开了 XDMCP 的主机发送连接请求,-screen 指定屏幕大小,-fullscreen 全屏。

比如我们想玩玩 aewm,就可以
$ Xephyr :1 -screen 800x600
$ export DISPLAY=:1.0
$ aewm &

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