---
name: "XcupGetReservedColormapEntries"
section: "3"
platform: "linux"
package: "libxext"
version: "1.3.7-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/XcupGetReservedColormapEntries"
---

# XcupGetReservedColormapEntries(3)

list colormap entries reserved by the system

## NAME

XcupGetReservedColormapEntries - list colormap entries reserved by the system

## SYNOPSIS

```
cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/Xcup.h>

Status XcupGetReservedColormapEntries(Display *display,
    int screen, XColor **colors_out, int *ncolors);
```

## ARGUMENTS

- *display*

  Specifies the connection to the X server.

- *screen*

  Screen number on the host server.

- *colors\_out*

  Returns the values reserved by the server.

- *ncolors*

  Returns the number of items in *colors\_out*.

## DESCRIPTION

The **XcupGetReservedColormapEntries** function returns a list of colormap entries (pixels) that are reserved by the system. This list will, at a minimum, contain entries for the BlackPixel and WhitePixel of the specified screen. Use **XFree** to free *colors\_out.*

To minimize colormap flash, an application which installs its own private colormap should query the special colors by calling **XCupGetReservedColormapEntries**, and can then store those entries (in the proper location) in its private colormap using **XCupStoreColors**.

## SEE ALSO

**XcupQueryVersion**(3Xext), **XcupStoreColors**(3Xext), **XFree**(3X11),\
 *Colormap Utilization Policy and Extension*