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DRMHANDLEEVENT(3)          Direct Rendering Manager          DRMHANDLEEVENT(3)

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)