/* Try to authenticate the DRM client with help from the X server. */
void authenticate_drm_xcb(drm_magic_t magic) {
xcb_connection_t *conn = xcb_connect(NULL, NULL);
if (!conn) {
return;
}
if (xcb_connection_has_error(conn)) {
xcb_disconnect(conn);
return;
}
xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
xcb_window_t window = screen->root;
/* Authenticate our client via the X server using the magic. */
xcb_dri2_authenticate_cookie_t auth_cookie =
xcb_dri2_authenticate(conn, window, magic);
xcb_dri2_authenticate_reply_t *auth_reply =
xcb_dri2_authenticate_reply(conn, auth_cookie, NULL);
free(auth_reply);
xcb_disconnect(conn);
}
static int
dri2_connect(Display *display)
{
xcb_dri2_query_version_cookie_t query_version_cookie;
xcb_dri2_query_version_reply_t *query_version_reply;
xcb_dri2_connect_cookie_t connect_cookie;
xcb_dri2_connect_reply_t *connect_reply;
xcb_dri2_authenticate_cookie_t auth_cookie;
xcb_dri2_authenticate_reply_t *auth_reply;
xcb_screen_t *root;
xcb_connection_t *c = XGetXCBConnection(display);
drm_magic_t magic;
const xcb_query_extension_reply_t *dri2_reply;
char *device_name;
int len;
root = xcb_aux_get_screen(c, DefaultScreen(display));
dri2_reply = xcb_get_extension_data(c, &xcb_dri2_id);
if (!dri2_reply) {
XVMC_ERR("DRI2 required");
return BadValue;
}
/* Query the extension and make our first use of it at the same time. */
query_version_cookie = xcb_dri2_query_version(c, 1, 0);
connect_cookie = xcb_dri2_connect(c, root->root, DRI2DriverDRI);
query_version_reply =
xcb_dri2_query_version_reply(c, query_version_cookie, NULL);
connect_reply = xcb_dri2_connect_reply(c, connect_cookie, NULL);
if (!query_version_reply) {
XVMC_ERR("DRI2 required");
return BadValue;
}
free(query_version_reply);
len = xcb_dri2_connect_device_name_length(connect_reply);
device_name = malloc(len + 1);
if (!device_name) {
XVMC_ERR("malloc failure");
return BadAlloc;
}
strncpy(device_name, xcb_dri2_connect_device_name(connect_reply), len);
device_name[len] = 0;
xvmc_driver->fd = open(device_name, O_RDWR);
free(device_name);
free(connect_reply);
if (xvmc_driver->fd < 0) {
XVMC_ERR("Failed to open drm device: %s\n", strerror(errno));
return BadValue;
}
if (drmGetMagic(xvmc_driver->fd, &magic)) {
XVMC_ERR("Failed to get magic\n");
return BadValue;
}
auth_cookie = xcb_dri2_authenticate(c, root->root, magic);
auth_reply = xcb_dri2_authenticate_reply(c, auth_cookie, NULL);
if (!auth_reply) {
XVMC_ERR("Failed to authenticate magic %d\n", magic);
return BadValue;
}
free(auth_reply);
return Success;
}