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I run emacs using a server and multiple clients on both, the graphical display and the terminal.
To use the same configuration files for terminal and graphical display, I used this solution.

The issue is, on starting a new emacs client, the fullscreen function gets called on all the already running clients too, and causes a very unwanted behaviour which sometimes throws up errors too.

The display-graphic-p function doc says,

(display-graphic-p &optional DISPLAY)

Return non-nil if DISPLAY is a graphic display. Graphical displays are those which are capable of displaying several frames and several different fonts at once. This is true for displays that use a window system such as X, and false for text-only terminals. DISPLAY can be a display name, a frame, or nil (meaning the selected frame's display).

I think my issue can be resolved by specifically calling the fullscreen function on the selected frame's display. So, my question is, how to obtain the name of the current display?

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  • I think you should call it without arguments, that way you check if the current (selected) frame is a tty or graphical.
    – Lindydancer
    Nov 6, 2015 at 7:39
  • Yes. I do that. But after checking that, I need to call some functions to modify the concerned frame (graphical or tty). To do that, I need to pass the DISPLAY variable, else it calls the functions on all the running frames.
    – reza.safiyat
    Nov 6, 2015 at 9:54
  • Can you post a link to the fullscreen package that you use.
    – Lindydancer
    Nov 6, 2015 at 10:04
  • github.com/safiyat/emacs/blob/… But now I started using emacs 24.5 (since yesterday). Will see how its inbuilt fullscreen behaves. :)
    – reza.safiyat
    Nov 6, 2015 at 10:15
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    It seem to ask the window system to enter fullscreen mode by sending X11 events. Obviously, you can't control which frames should be affected. Try to simply do (set-frame-parameter (selected-frame) 'fullscreen 'fullboth) instead, when the current frame is graphical.
    – Lindydancer
    Nov 6, 2015 at 10:37

2 Answers 2

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After digging into get-device-terminal it looks like it's the same as the device or tty frame property.

According to the documentation, it's the X11 display name HOST.SERVER.SCREEN. On MS-windows it's simply the string "w32".

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  • Looks like what I have been looking for. Running it in my case prints #<terminal 1 on /dev/pts/9>. Have to figure out how to use that info. :)
    – reza.safiyat
    Nov 5, 2015 at 18:13
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For frames running on a graphic display, the name of the current display as a string is obtained with (frame-parameter nil 'display), which returns the display property of the selected frame.

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