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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
Written 2012 by David Herrmann <dh.herrmann@googlemail.com>
Dedicated to the Public Domain
-->
<refentry id="drmHandleEvent">
<refentryinfo>
<title>Direct Rendering Manager</title>
<productname>libdrm</productname>
<date>September 2012</date>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>David</firstname>
<surname>Herrmann</surname>
<email>dh.herrmann@googlemail.com</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>drmHandleEvent</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>drmHandleEvent</refname>
<refpurpose>read and process pending DRM events</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <xf86drm.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>drmHandleEvent</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
<paramdef>drmEventContextPtr <parameter>evctx</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>drmHandleEvent</function> processes outstanding DRM events
on the DRM file-descriptor passed as <parameter>fd</parameter>. This
function should be called after the DRM file-descriptor has polled
readable; it will read the events and use the passed-in
<parameter>evctx</parameter> structure to call function pointers
with the parameters noted below:
<programlisting>
typedef struct _drmEventContext {
int version;
void (*vblank_handler) (int fd,
unsigned int sequence,
unsigned int tv_sec,
unsigned int tv_usec,
void *user_data)
void (*page_flip_handler) (int fd,
unsigned int sequence,
unsigned int tv_sec,
unsigned int tv_usec,
void *user_data)
} drmEventContext, *drmEventContextPtr;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para><function>drmHandleEvent</function> returns <literal>0</literal> on
success, or if there is no data to read from the file-descriptor.
Returns <literal>-1</literal> if the read on the file-descriptor fails
or returns less than a full event record.</para>
</refsect1>
<refsect1>
<title>Reporting Bugs</title>
<para>Bugs in this function should be reported to
http://bugs.freedesktop.org under the "Mesa" product, with "Other" or
"libdrm" as the component.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>drm</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>drm-kms</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>drmModePageFlip</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>drmWaitVBlank</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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