NAME

       drmHandleEvent - read and process pending DRM events

SYNOPSIS

       #include <xf86drm.h>

       int drmHandleEvent(int fd, drmEventContextPtr evctx);

DESCRIPTION

       drmHandleEvent  processes  outstanding DRM events on the DRM file-descriptor passed as fd.
       This function should be called after the DRM file-descriptor has polled readable; it  will
       read  the  events and use the passed-in evctx structure to call function pointers with the
       parameters noted below:

          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;

RETURN VALUE

       drmHandleEvent  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.

REPORTING BUGS

       Bugs       in       this        function        should        be        reported        to
       https://gitlab.freedesktop.org/mesa/drm/-/issues

SEE ALSO

       drm(7), drm-kms(7), drmModePageFlip(3), drmWaitVBlank(3)

                                          September 2012                        DRMHANDLEEVENT(3)