Constant MASTER

pub const MASTER: u32 = bindings::drm_ioctl_flags_DRM_MASTER; // 2u32

This must be set for any ioctl which can change the modeset or display state. Userspace must call the ioctl through a primary node, while it is the active master.

Note that read-only modeset ioctl can also be called by unauthenticated clients, or when a master is not the currently active one.