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/libdrm/-/issues>

See Also

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

                                                 September 2012                                drmHandleEvent(3)