diff options
Diffstat (limited to 'libdrm/xf86drmMode.c')
| -rw-r--r-- | libdrm/xf86drmMode.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libdrm/xf86drmMode.c b/libdrm/xf86drmMode.c index 88b4fe3a..6d85113a 100644 --- a/libdrm/xf86drmMode.c +++ b/libdrm/xf86drmMode.c @@ -46,6 +46,7 @@ #include <drm.h> #include <string.h> #include <dirent.h> +#include <unistd.h> #include <errno.h> #define U642VOID(x) ((void *)(unsigned long)(x)) @@ -667,3 +668,45 @@ int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size, return 0; } + +int drmHandleEvent(int fd, drmEventContextPtr evctx) +{ + char buffer[1024]; + int len, i; + struct drm_event *e; + struct drm_event_vblank *vblank; + + /* The DRM read semantics guarantees that we always get only + * complete events. */ + + len = read(fd, buffer, sizeof buffer); + if (len == 0) + return 0; + if (len < sizeof *e) + return -1; + + i = 0; + while (i < len) { + e = (struct drm_event *) &buffer[i]; + switch (e->type) { + case DRM_EVENT_VBLANK: + if (evctx->version < 1 || + evctx->vblank_handler == NULL) + break; + vblank = (struct drm_event_vblank *) e; + evctx->vblank_handler(fd, + vblank->sequence, + vblank->tv_sec, + vblank->tv_usec, + U642VOID (vblank->user_data)); + break; + + default: + break; + } + i += e->length; + } + + return 0; +} + |