581 lines
11 KiB
Groff
581 lines
11 KiB
Groff
'\" t
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.\" Title: xlistinputdevices
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 10/13/2016
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.\" Manual: \ \&
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.\" Source: \ \&
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.\" Language: English
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.\"
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.TH "XLISTINPUTDEVICES" "libmansuffix" "10/13/2016" "\ \&" "\ \&"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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XListInputDevices, XFreeDeviceList \- list available input devices
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.SH "SYNOPSIS"
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.sp
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.nf
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#include <X11/extensions/XInput\&.h>
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.fi
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.sp
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.nf
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XDeviceInfo *XListInputDevices( Display *display,
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int *ndevices_return);
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.fi
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.sp
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.nf
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int XFreeDeviceList( XDeviceInfo *list);
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.fi
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.sp
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.nf
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display
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Specifies the connection to the X server\&.
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.fi
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.sp
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.nf
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ndevices_return
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Specifies a pointer to a variable where the number of
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available devices canbe returned\&.
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.fi
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.sp
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.nf
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list
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Specifies the list of devices to free\&. The
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XFreeDeviceList functionfrees the list of available
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extension input devices\&.
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.fi
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.SH "DESCRIPTION"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XListInputDevices request lists the available input
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devices\&. This list includes the core keyboard and any physical
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input device currently accessible through the X server, and any
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input devices that are not currently accessible through the X
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server but could be accessed if requested\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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A master pointer is a virtual pointer device that does not
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represent a physical device\&. It is visually represented through
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a cursor\&. A master keyboard is a virtual keyboard device that
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does not represent a physical device\&. It is virtually
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representd through a keyboard focus\&. A master pointer and a
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master keyboard are always paired (i\&.e\&. if shift is pressed on
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the master keyboard, a pointer click would be a shift\-click)\&.
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Multiple master pointer/keyboard pairs can exist\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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X servers supporting the X Input Extension version 2,
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XListInputDevices only returns the first master pointer, the
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first master keyboard and all slave devices\&. Additional master
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devices are not listed\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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Physical devices (so\-called slave devices) are attached to
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either a master pointer or a master keyboard, depending on
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their capabilities\&. If a slave device generates an event, the
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event is also generated by the respective master device\&.
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Multiple slave devices can be attached to a single master
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device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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Some server implementations may make all physical input devices
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available at the time the server is initialized\&. Others may
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wait until requested by a client to access an input device\&. In
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the latter case, it is possible that an input device will be
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listed as available at one time but not at another\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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For each input device available to the server, the
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XListInputDevices request returns an XDeviceInfo structure\&.
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That structure contains a pointer to a list of structures, each
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of which contains information about one class of input
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supported by the device\&. The XDeviceInfo structure is defined
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as follows:
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typedef struct _XDeviceInfo {
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XID id;
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Atom type;
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char *name;
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int num_classes;
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int use;
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XAnyClassPtr inputclassinfo;
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} XDeviceInfo;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The id is a number in the range 0\-128 that uniquely identifies
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the device\&. It is assigned to the device when it is initialized
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by the server\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The type field is of type Atom and indicates the nature of the
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device\&. The type will correspond to one of the following strings
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(defined in the header file XI\&.h):
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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XI_MOUSE XI_TABLET XI_KEYBOARD XI_TOUCHSCREEN XI_TOUCHPAD
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XI_BUTTONBOX XI_BARCODE XI_TRACKBALL XI_QUADRATURE XI_ID_MODULE
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XI_ONE_KNOB XI_NINE_KNOB XI_KNOB_BOX XI_SPACEBALL XI_DATAGLOVE
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XI_EYETRACKER XI_CURSORKEYS XI_FOOTMOUSE XI_JOYSTICK
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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These strings may be used in an XInternAtom request to return
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an atom that can be compared with the type field of the
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XDeviceInfo structure\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The name field contains a pointer to a null\-terminated string
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that serves as identifier of the device\&. This identifier may be
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user\-configured or automatically assigned by the server\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The num_classes field is a number in the range 0\-255 that
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specifies the number of input classes supported by the device
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for which information is returned by ListInputDevices\&. Some
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input classes, such as class Focus and class Proximity do not
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have any information to be returned by ListInputDevices\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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All devices provide an AttachClass\&. This class specifies the
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master device a given slave device is attached to\&. For master
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devices, the class specifies the respective paired master
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device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The use field specifies how the device is currently being used\&.
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If the value is IsXKeyboard, the device is a master keyboard\&.
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If the value is IsXPointer, the device is a master pointer\&. If
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the value is IsXExtensionPointer, the device is a slave
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pointer\&. If the value is IsXExtensionKeyboard, the device is a
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slave keyboard\&. If the value is IsXExtensionDevice, the device
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is available for use as an extension device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The inputclassinfo field contains a pointer to the first
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input\-class specific data\&. The first two fields are common to
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all classes\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The class field is a number in the range 0\-255\&. It uniquely
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identifies the class of input for which information is
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returned\&. Currently defined classes are KeyClass, ButtonClass,
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and ValuatorClass\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The length field is a number in the range 0\- 255\&. It specifies
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the number of bytes of data that are contained in this input
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class\&. The length includes the class and length fields\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XKeyInfo structure describes the characteristics of the
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keys on the device\&. It is defined as follows:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct _XKeyInfo {
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XID class;
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int length;
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unsigned short min_keycode;
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unsigned short max_keycode;
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unsigned short num_keys;
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} XKeyInfo;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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min_keycode is of type KEYCODE\&. It specifies the minimum
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keycode that the device will report\&. The minimum keycode will
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not be smaller than 8\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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max_keycode is of type KEYCODE\&. It specifies the maximum
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keycode that the device will report\&. The maximum keycode will
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not be larger than 255\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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num_keys specifies the number of keys that the device has\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XButtonInfo structure defines the characteristics of the
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buttons on the device\&. It is defined as follows:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct _XButtonInfo {
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XID class;
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int length;
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short num_buttons;
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} XButtonInfo;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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num_buttons specifies the number of buttons that the device
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has\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XValuatorInfo structure defines the characteristics of the
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valuators on the device\&. It is defined as follows:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct _XValuatorInfo {
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XID class;
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int length;
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unsigned char num_axes;
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unsigned char mode;
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unsigned long motion_buffer;
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XAxisInfoPtr axes;
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} XValuatorInfo;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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num_axes contains the number of axes the device supports\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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mode is a constant that has one of the following values:
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Absolute or Relative\&. Some devices allow the mode to be changed
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dynamically via the SetDeviceMode request\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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motion_buffer_size is a cardinal number that specifies the
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number of elements that can be contained in the motion history
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buffer for the device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The axes field contains a pointer to an XAxisInfo structure\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XAxisInfo structure is defined as follows:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct _XAxisInfo {
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int resolution;
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int min_value;
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int max_value;
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} XAxisInfo;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The resolution contains a number in counts/meter\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The min_val field contains a number that specifies the minimum
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value the device reports for this axis\&. For devices whose mode
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is Relative, the min_val field will contain 0\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The max_val field contains a number that specifies the maximum
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value the device reports for this axis\&. For devices whose mode
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is Relative, the max_val field will contain 0\&.
|
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.fi
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.if n \{\
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.RE
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.\}
|
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.sp
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.if n \{\
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.RS 4
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.\}
|
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.nf
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|
The XAttachInfo structure is defined as follows:
|
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typedef struct _XAttachInfo {
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int attached;
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} XAttachInfo;
|
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.fi
|
|
.if n \{\
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.RE
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|
.\}
|
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.sp
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|
.if n \{\
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.RS 4
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.\}
|
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.nf
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|
If the device is a slave device, attached specifies the device
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ID of the master device this device is attached to\&. If the
|
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device is not attached to a master device, attached is
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|
Floating\&. If the device is a master device, attached specifies
|
|
the device ID of the master device this device is paired with\&.
|
|
.fi
|
|
.if n \{\
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.RE
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|
.\}
|
|
.SH "RETURN VALUE"
|
|
.sp
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|
.if n \{\
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.RS 4
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.\}
|
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.nf
|
|
XListInputDevices returns a pointer to an array of XDeviceInfo
|
|
structs and sets ndevices_return to the number of elements in
|
|
that array\&. To free the XDeviceInfo array created by
|
|
XListInputDevices, use XFreeDeviceList\&.
|
|
.fi
|
|
.if n \{\
|
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.RE
|
|
.\}
|
|
.sp
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|
.if n \{\
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.RS 4
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.\}
|
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.nf
|
|
On error, XListInputDevices returns NULL and ndevices_return is
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|
left unmodified\&.
|
|
.fi
|
|
.if n \{\
|
|
.RE
|
|
.\}
|