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)