Xinerama − API for Xinerama extension to X11 Protocol


#include <X11/extensions/Xinerama.h>

Bool XineramaQueryExtension (Display *dpy,

int *event_base_return, int *error_base_return);

Status XineramaQueryVersion (Display *dpy,

int *major_version_return,

int *minor_version_return);

Bool XineramaIsActive (Display *dpy);

XineramaScreenInfo * XineramaQueryScreens (Display *dpy,

int *number);



Specifies the connection to the X server.


Specifies the return location for the assigned base event code


Specifies the return location for the assigned base error code


Returns the major version supported by the server


Returns the minor version supported by the server


Returns the number of entries in the returned XineramaScreenInfo array.


Xinerama is a simple library designed to interface the Xinerama Extension for retrieving information about physical output devices which may be combined into a single logical X screen.


The XineramaQueryExtension function queries the Xserver to determine the availability of the Xinerama Extension. If the extension is available, the return value is True, and event_base_return and error_base_return are set to the base event number and base error number for the extension, respectively. Otherwise, the return value is False, and the values of event_base_return and error_base_return are undefined.

The XineramaQueryVersion function returns the version of the Xinerama extension implemented by the Xserver. The version is returned in major_version_return and minor_version_return. The major version will be incremented for protocol incompatible changes, and the minor version will be incremented for small, upwardly compatible changes.

If the Xinerama library is compatible with the version returned by the server, it returns nonzero. If the server does not support the XINERAMA extension, or if there was an error during communications with the server, or if the server and library protocol versions are incompatible, it returns zero.

The XineramaIsActive function returns a Boolean operator used to determine if Xinerama is activated on the screen. Returns True for active and False for not active.

The XineramaQueryScreens() function returns info about each individual output device within the Xinerama Screen. The integer pointed to by the number argument is updated to the number of output devices listed in the returned array of XineramaScreenInfo structures. XineramaQueryScreens() returns NULL and sets number to 0 if Xinerama is not active.

The pointer returned should be released with XFree(3) when no longer needed.


The original API provided for interacting with the XINERAMA extension used function names beginning with XPanoramiX. That API is now deprecated and this API should be used instead in new software.


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.