launcher: Set make sure we're drm master when opening the drm device

In case we try to run on a tty where some other process is already
drm master, back off and exit with an error message.
parent 19ec77ae
......@@ -65,6 +65,26 @@ struct weston_launcher {
struct wl_event_source *vt_source;
};
#ifdef BUILD_DRM_COMPOSITOR
static int
drm_drop_master(int drm_fd)
{
if (drm_fd != -1)
return drmDropMaster(drm_fd);
return -EBADF;
}
static int
drm_set_master(int drm_fd)
{
if (drm_fd != -1)
return drmSetMaster(drm_fd);
return -EBADF;
}
#else
static int drm_drop_master(int drm_fd) {return 0;}
static int drm_set_master(int drm_fd) {return 0;}
#endif
int
weston_launcher_open(struct weston_launcher *launcher,
const char *path, int flags)
......@@ -81,7 +101,6 @@ weston_launcher_open(struct weston_launcher *launcher,
if (launcher->fd == -1) {
fd = open(path, flags | O_CLOEXEC);
if (fd == -1)
return -1;
......@@ -90,8 +109,14 @@ weston_launcher_open(struct weston_launcher *launcher,
return -1;
}
if (major(s.st_rdev) == DRM_MAJOR)
if (major(s.st_rdev) == DRM_MAJOR) {
launcher->drm_fd = fd;
if (drm_set_master(fd) == -1) {
weston_log("could not set master on drm fd\n");
close(fd);
return -1;
}
}
return fd;
}
......@@ -198,26 +223,6 @@ weston_launcher_data(int fd, uint32_t mask, void *data)
return 1;
}
#ifdef BUILD_DRM_COMPOSITOR
static int
drm_drop_master(int drm_fd)
{
if (drm_fd != -1)
return drmDropMaster(drm_fd);
return -EBADF;
}
static int
drm_set_master(int drm_fd)
{
if (drm_fd != -1)
return drmSetMaster(drm_fd);
return -EBADF;
}
#else
static int drm_drop_master(int drm_fd) {return 0;}
static int drm_set_master(int drm_fd) {return 0;}
#endif
static int
vt_handler(int signal_number, void *data)
{
......
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