XIGrabDevice, XIUngrabDevice − grab or ungrab the device.


#include <X11/extensions/XInput2.h>

Status XIGrabDevice( Display *display,
int deviceid,
Window grab_window,
Time time,
Cursor cursor,
int grab_mode,
int paired_device_mode,
Bool owner_events,
XIEventMask *mask);

Status XIUngrabDevice( Display *display,
int deviceid,
Time time);

Specifies the cursor image to display for the duration
of the grab.

Specifies the connection to the X server.

Specifies the device that should be grabbed or

grab_mode, paired_device_mode
The grab mode for this device and (if applicable) the
paired device.

The grab window.

Event mask.

True if events are to be reported normally.

A valid timestamp or CurrentTime.


XIGrabDevice actively grabs control of the device. Further
device events are reported only to the grabbing client.
XIGrabDevice overrides any active device grab by this client.

If the device is an attached slave device, the device is
automatically detached from the master device and reattached to
the same master device when client ungrabs the device. If the
master device is removed while the device is floating as a
result of a grab, the device remains floating once the grab

If owner_events is False, all generated device events are
reported with respect to grab_window if selected. If
owner_events is True and if a generated device event would
normally be reported to this client, it is reported normally;
otherwise, the event is reported with respect to the
grab_window, and is only reported if specified in the event

If the grab_mode argument is GrabModeAsync, device event
processing continues as usual. If the device is currently
frozen by this client, then processing of device events is
resumed. If the grab_mode argument is GrabModeSync, the state
of the device (as seen by client applications) appears to
freeze, and the X server generates no further device events
until the grabbing client issues a releasing XIAllowEvents call
or until the device grab is released. Actual device changes are
not lost while the device is frozen; they are simply queued in
the server for later processing.

If paired_device_mode is GrabModeAsync, processing of events
from the paired master device is unaffected by activation of
the grab. If paired_device_mode is GrabModeSync, the state of
the paired master device (as seen by client applications)
appears to freeze, and the X server generates no further events
from this device until the grabbing client issues a releasing
XIAllowEvents call or until the device grab is released. Actual
events are not lost while the devices are frozen; they are
simply queued in the server for later processing. If the device
is a slave device paired_device_mode is ignored.

If the device is actively grabbed by some other client,
XIGrabDevice fails and returns AlreadyGrabbed. If grab_window
is not viewable, it fails and returns GrabNotViewable. If the
device is frozen by an active grab of another client, it fails
and returns GrabFrozen. If the specified time is earlier than
the last−device−grab time or later than the current X server
time, it fails and returns GrabInvalidTime. Otherwise, the
last−device−grab time is set to the specified time. CurrentTime
is replaced by the current X server time.

If cursor is not None this cursor is displayed until the client
calls XIUngrabDevice.

XIGrabDevice can generate BadDevice, BadValue, and BadWindow

The XIUngrabDevice request releases the device and any queued
events if this client has it actively grabbed from either
XIGrabDevice or XIGrabKey or XIGrabButton. If other devices are
frozen by the grab, XUngrabDevice thaws them. XUngrabDevice
does not release the device and any queued events if the
specified time is earlier than the last−device−grab time or is
later than the current X server time. The X server
automatically performs an XIUngrabDevice request if the event
window for an active device grab becomes not viewable.

XIUngrabDevice can generate a BadDevice error.


A value is outside of the permitted range.

An invalid device was specified. The device does not
exist or is not a appropriate for the type of change.

The window is not viewable.

A value for a Window argument does not name a defined




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.