</biblioentry>
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<para>These ioctls are optional, drivers need not implement
them. If so, they return the &EINVAL;.</para>
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follow SGI's lead, and adopt a multimedia timestamping system like
their UST (Unadjusted System Time). See
http://web.archive.org/web/*/http://reality.sgi.com
-/cpirazzi_engr/lg/time/intro.html.
+/cpirazzi_engr/lg/time/intro.html.
UST uses timestamps that are 64-bit signed integers
(not struct timeval's) and given in nanosecond units. The UST clock
starts at zero when the system is booted and runs continuously and
</itemizedlist>
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linkend="userp">user pointer</link>) I/O. See <xref
linkend="io" /> for details.</para>
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I/O.</para>
<para>[to do]</para>
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functions, or through the streaming I/O mechanism.</para>
<para>[to do]</para>
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event you want to subscribe to whether this is applicable for that event or not.</para>
</listitem>
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however the framebuffer interface of the driver may support the
<constant>FBIOBLANK</constant> ioctl.</para>
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linkend="userp">user pointer</link>) I/O. See <xref
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<para>To start or stop the frame buffer overlay applications call
the &VIDIOC-OVERLAY; ioctl.</para>
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&VIDIOC-G-MODULATOR; ioctl
reports the supported frequency range.</para>
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unavailable, for example the device is already in use by another
process.</para>
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<para>Modern devices all use the <link linkend="raw-vbi">raw</link> or
<link linkend="sliced">sliced</link> VBI API.</para>
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<para>to do</para>
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the parameter remains unmodified.</para>
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</mediaobject>
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