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.TH "drmHandleEvent" "3" "September 2012" "" "Direct Rendering Manager"
.SH Name
drmHandleEvent \- read and process pending DRM events
.SH Synopsis
.sp
\fB#include <xf86drm.h>\fP
.sp
\fBint drmHandleEvent(int fd, drmEventContextPtr evctx);\fP
.SH Description
.sp
\fBdrmHandleEvent\fP processes outstanding DRM events on the DRM
file\-descriptor passed as \fBfd\fP\&. This function should be called after
the DRM file\-descriptor has polled readable; it will read the events and
use the passed\-in \fBevctx\fP structure to call function pointers with the
parameters noted below:
.INDENT 0.0
.INDENT 3.5
.sp
.EX
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;
.EE
.UNINDENT
.UNINDENT
.SH Return Value
.sp
\fBdrmHandleEvent\fP returns 0 on success, or if there is no data to
read from the file\-descriptor. Returns \-1 if the read on the
file\-descriptor fails or returns less than a full event record.
.SH Reporting Bugs
.sp
Bugs in this function should be reported to
\%<https://\:gitlab\:.freedesktop\:.org/\:mesa/\:libdrm/\:-/\:issues>
.SH See Also
.sp
\fBdrm\fP(7), \fBdrm\-kms\fP(7), \fBdrmModePageFlip\fP(3),
\fBdrmWaitVBlank\fP(3)
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