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, pc, haiku, or pgtk).
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 list of all live terminal objects.
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 to
delete-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 in The GNU Emacs Manual). 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 in The GNU Emacs Manual.
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 in The
GNU Emacs Manual. 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:
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.
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.
Width and height in millimeters as ‘(width height)’
List of frames that this physical monitor dominates (see below).
Name of the physical monitor as string.
Source of the multi-monitor information as string; e.g., ‘XRandR 1.5’, ‘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)))
This function returns the attributes of the physical monitor dominating (see above) frame, which defaults to the selected frame.
On multi-monitor displays it is possible to use the command
make-frame-on-monitor to make frames on the specified monitor.
This function creates and returns a new frame on monitor located
on display, taking the other frame parameters from the alist
parameters. monitor should be the name of the physical
monitor, the same string as returned by the function
display-monitor-attributes-list in the attribute name.
display should be the name of an X display (a string).
This variable is an abnormal hook run when the monitor configuration
changes, which can happen if a monitor is rotated, moved, added or
removed from a multiple-monitor setup, if the primary monitor changes,
or if the resolution of a monitor changes. It is called with a single
argument consisting of the terminal on which the monitor configuration
changed. Programs should call display-monitor-attributes-list
with the terminal as the argument to retrieve the new monitor
configuration on that terminal.