CentOS 7.0 - man page for xdevicebell (centos section 3)
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XDeviceBell - ring a bell on a device supported through the input extension
Status XDeviceBell( Display *display,
Specifies the connection to the X server.
Specifies the device with which the bell is associated.
Specifies the class of the feedback with which the bell
Specifies the id of the feedback with which the bell is
Specifies the volume in the range -100 to 100 at which
the bell should be rung.
The XDeviceBell request causes the server to ring a bell on the
specified feedback of the specified device, if possible. The
specified volume is relative to the base volume for the bell.
If an invalid device is specified, a BadDevice error will be
returned. The feedbackclass and feedbackid parameters contain
values returned by an XGetFeedbackControl request and uniquely
identify the bell to ring. If a feedbackclass is specified that
does not support a bell, or if a nonexistent feedbackid is
specified, or a percent value is specified that is not in the
range -100 to 100, a BadValue error will be returned.
The volume at which the bell is rung when the percent argument
is nonnegative is: base - [(base * percent) / 100] + percent
The volume at which the bell rings when the percent argument is
negative is: base + [(base * percent) / 100]
To change the base volume of the bell, use
XDeviceBell can generate a BadDevice or a BadValue error.
An invalid device was specified. The specified device
does not exist, or has not been opened by this client
An invalid feedbackclass, feedbackid, or percent value
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