Initial implementation of seatd and libseat

common/drm.c

@@ -0,0 +1,23 @@
+#include <sys/ioctl.h>
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+
+#include "drm.h"
+
+// From libdrm
+#define DRM_IOCTL_BASE	      'd'
+#define DRM_IO(nr)	      _IO(DRM_IOCTL_BASE, nr)
+#define DRM_IOCTL_SET_MASTER  DRM_IO(0x1e)
+#define DRM_IOCTL_DROP_MASTER DRM_IO(0x1f)
+
+int drm_set_master(int fd) {
+	return ioctl(fd, DRM_IOCTL_SET_MASTER, 0);
+}
+
+int drm_drop_master(int fd) {
+	return ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
+}
+
+int dev_is_drm(dev_t device) {
+	return major(device) == 226;
+}