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'\" t
.\" Title: xiselectevents
.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\" Date: 09/15/2021
.\" Manual: \ \&
.\" Source: \ \&
.\" Language: English
.\"
.TH "XISELECTEVENTS" "libmansuffix" "09/15/2021" "\ \&" "\ \&"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
XISelectEvents, XIGetSelectedEvents \- select for or get selected XI2 events on the window\&.
.SH "SYNOPSIS"
.sp
.nf
#include <X11/extensions/XInput2\&.h>
.fi
.sp
.nf
Status XISelectEvents( Display *display,
Window win,
XIEventMask *masks,
int num_masks);
.fi
.sp
.nf
display
Specifies the connection to the X server\&.
.fi
.sp
.nf
masks
Device event mask\&.
.fi
.sp
.nf
num_masks
Number of masks in masks\&.
.fi
.sp
.nf
win
Specifies the window\&.
.fi
.sp
.nf
XIEventMask *XIGetSelectedEvents( Display *display,
Window win,
int *num_masks_return);
.fi
.sp
.nf
display
Specifies the connection to the X server\&.
.fi
.sp
.nf
num_masks_return
Number of masks in the return value\&.
.fi
.sp
.nf
win
Specifies the window\&.
.fi
.SH "DESCRIPTION"
.sp
.if n \{\
.RS 4
.\}
.nf
XI2 events must be selected using XISelectEvents\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XISelectEvents sets the event mask for this client on win\&.
Further events are only reported to this client if the event
type matches the selected event mask\&. The masks overrides the
previously selected event mask for the given device\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
If deviceid is a valid device, the event mask is selected only
for this device\&. If deviceid is XIAllDevices or
XIAllMasterDevices, the event mask is selected for all devices
or all master devices, respectively\&. The effective event mask
is the bit\-wise OR of the XIAllDevices, XIAllMasterDevices and
the respective device\*(Aqs event mask\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
typedef struct {
int deviceid;
int mask_len;
unsigned char* mask;
} XIEventMask;
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
The mask_len specifies the length of mask in bytes\&. mask is a
binary mask in the form of (1 << event type)\&. deviceid must be
either a device or XIAllDevices or XIAllMasterDevices\&. A client
may submit several masks with the same deviceid in one request
but only the last mask will be effective\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XISelectEvents can generate a BadValue, a BadDevice, and a
BadWindow error\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XIGetSelectedEvents returns the events selected by this client on the given
window\&. If no events were selected on this window, XIGetSelectedEvents
returns NULL and num_masks_return is set to 0\&. If an internal error occurs,
XIGetSelectedEvents returns NULL and num_masks_return is set to \-1\&.
Otherwise, XIGetSelectedEvent returns the selected event masks for all
devices including the masks for XIAllDevices and XIAllMasterDevices
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
The caller must free the returned data using XFree()\&.
.fi
.if n \{\
.RE
.\}
.SH "DIAGNOSTICS"
.sp
.if n \{\
.RS 4
.\}
.nf
BadValue
A value is outside of the permitted range\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
BadWindow
A value for a Window argument does not name a defined
window\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
BadDevice
An invalid device was specified\&. The device does not
exist\&.
.fi
.if n \{\
.RE
.\}
|
