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Emacs represents each terminal as a terminal object data type (see Terminal Type). On GNU and Unix systems, Emacs can use multiple terminals simultaneously in each session. On other systems, it can only use a single terminal. Each terminal object has the following attributes:
terminal-live-p
(i.e., x
,
t
, w32
, ns
, or pc
). See Frames.
There is no primitive for creating terminal objects. Emacs creates
them as needed, such as when you call make-frame-on-display
(described below).
This function returns the file name of the device used by terminal. If terminal is omitted or
nil
, it defaults to the selected frame's terminal. terminal can also be a frame, meaning that frame's terminal.
This function returns a terminal whose device name is given by device. If device is a string, it can be either the file name of a terminal device, or the name of an X display of the form ‘host:server.screen’. If device is a frame, this function returns that frame's terminal;
nil
means the selected frame. Finally, if device is a terminal object that represents a live terminal, that terminal is returned. The function signals an error if its argument is none of the above.
This function deletes all frames on terminal and frees the resources used by it. It runs the abnormal hook
delete-terminal-functions
, passing terminal as the argument to each function.If terminal is omitted or
nil
, it defaults to the selected frame's terminal. terminal can also be a frame, meaning that frame's terminal.Normally, this function signals an error if you attempt to delete the sole active terminal, but if force is non-
nil
, you are allowed to do so. Emacs automatically calls this function when the last frame on a terminal is deleted (see Deleting Frames).
An abnormal hook run by
delete-terminal
. Each function receives one argument, the terminal argument passed todelete-terminal
. Due to technical details, the functions may be called either just before the terminal is deleted, or just afterwards.
A few Lisp variables are terminal-local; that is, they have a
separate binding for each terminal. The binding in effect at any time
is the one for the terminal that the currently selected frame belongs
to. These variables include default-minibuffer-frame
,
defining-kbd-macro
, last-kbd-macro
, and
system-key-alist
. They are always terminal-local, and can
never be buffer-local (see Buffer-Local Variables).
On GNU and Unix systems, each X display is a separate graphical
terminal. When Emacs is started from within the X window system, it
uses the X display specified by the DISPLAY environment
variable, or by the ‘--display’ option (see Initial Options). Emacs can connect to other X displays
via the command make-frame-on-display
. Each X display has its
own selected frame and its own minibuffer windows; however, only one
of those frames is the selected frame at any given moment
(see Input Focus). Emacs can even connect to other text
terminals, by interacting with the emacsclient program.
See Emacs Server.
A single X server can handle more than one display. Each X display has a three-part name, ‘hostname:displaynumber.screennumber’. The first part, hostname, specifies the name of the machine to which the display is physically connected. The second part, displaynumber, is a zero-based number that identifies one or more monitors connected to that machine that share a common keyboard and pointing device (mouse, tablet, etc.). The third part, screennumber, identifies a zero-based screen number (a separate monitor) that is part of a single monitor collection on that X server. When you use two or more screens belonging to one server, Emacs knows by the similarity in their names that they share a single keyboard.
Systems that don't use the X window system, such as MS-Windows, don't support the notion of X displays, and have only one display on each host. The display name on these systems doesn't follow the above 3-part format; for example, the display name on MS-Windows systems is a constant string ‘w32’, and exists for compatibility, so that you could pass it to functions that expect a display name.
This function creates and returns a new frame on display, taking the other frame parameters from the alist parameters. display should be the name of an X display (a string).
Before creating the frame, this function ensures that Emacs is set up to display graphics. For instance, if Emacs has not processed X resources (e.g., if it was started on a text terminal), it does so at this time. In all other respects, this function behaves like
make-frame
(see Creating Frames).
This function returns a list that indicates which X displays Emacs has a connection to. The elements of the list are strings, and each one is a display name.
This function opens a connection to the X display display, without creating a frame on that display. Normally, Emacs Lisp programs need not call this function, as
make-frame-on-display
calls it automatically. The only reason for calling it is to check whether communication can be established with a given X display.The optional argument xrm-string, if not
nil
, is a string of resource names and values, in the same format used in the .Xresources file. See X Resources. These values apply to all Emacs frames created on this display, overriding the resource values recorded in the X server. Here's an example of what this string might look like:"*BorderWidth: 3\n*InternalBorder: 2\n"If must-succeed is non-
nil
, failure to open the connection terminates Emacs. Otherwise, it is an ordinary Lisp error.
This function closes the connection to display display. Before you can do this, you must first delete all the frames that were open on that display (see Deleting Frames).
On some multi-monitor setups, a single X display outputs to more
than one physical monitor. You can use the functions
display-monitor-attributes-list
and frame-monitor-attributes
to obtain information about such setups.
This function returns a list of physical monitor attributes on display, which can be a display name (a string), a terminal, or a frame; if omitted or
nil
, it defaults to the selected frame's display. Each element of the list is an association list, representing the attributes of a physical monitor. The first element corresponds to the primary monitor. The attribute keys and values are:
- ‘geometry’
- Position of the top-left corner of the monitor's screen and its size, in pixels, as ‘(x y width height)’. Note that, if the monitor is not the primary monitor, some of the coordinates might be negative.
- ‘workarea’
- Position of the top-left corner and size of the work area (usable space) in pixels as ‘(x y width height)’. This may be different from ‘geometry’ in that space occupied by various window manager features (docks, taskbars, etc.) may be excluded from the work area. Whether or not such features actually subtract from the work area depends on the platform and environment. Again, if the monitor is not the primary monitor, some of the coordinates might be negative.
- ‘mm-size’
- Width and height in millimeters as ‘(width height)’
- ‘frames’
- List of frames that this physical monitor dominates (see below).
- ‘name’
- Name of the physical monitor as string.
- ‘source’
- Source of the multi-monitor information as string; e.g., ‘XRandr’ or ‘Xinerama’.
x, y, width, and height are integers. ‘name’ and ‘source’ may be absent.
A frame is dominated by a physical monitor when either the largest area of the frame resides in that monitor, or (if the frame does not intersect any physical monitors) that monitor is the closest to the frame. Every (non-tooltip) frame (whether visible or not) in a graphical display is dominated by exactly one physical monitor at a time, though the frame can span multiple (or no) physical monitors.
Here's an example of the data produced by this function on a 2-monitor display:
(display-monitor-attributes-list) ⇒ (((geometry 0 0 1920 1080) ;; Left-hand, primary monitor (workarea 0 0 1920 1050) ;; A taskbar occupies some of the height (mm-size 677 381) (name . "DISPLAY1") (frames #<frame emacs@host *Messages* 0x11578c0> #<frame emacs@host *scratch* 0x114b838>)) ((geometry 1920 0 1680 1050) ;; Right-hand monitor (workarea 1920 0 1680 1050) ;; Whole screen can be used (mm-size 593 370) (name . "DISPLAY2") (frames)))