Struct DrmCard 

pub struct DrmCard { /* private fields */ }

An open DRM card node (e.g. /dev/dri/card0).

The fd is O_CLOEXEC and owned by this wrapper; it is closed on drop.

Implementations

impl DrmCard

pub fn open(path: &str) -> Result<Self, CoreError>

Open a DRM primary node by device path.

Errors

• ENOENT/ENODEV: no such card node.
• EACCES/EPERM: insufficient privilege for the device node.

pub fn wait_vblank(&self) -> Result<Instant, CoreError>

Block until the next vblank and return the monotonic instant the wait returned.

The reply t_sec/t_usec fields are deliberately ignored: they are zeroed on msm display stacks. Only the wait-unblock instant is trustworthy, so callers diff consecutive return values.

Errors

• EINTR: interrupted by a signal (safe to retry).
• EINVAL: the card does not support vblank waits.
• EBADF: the card fd was closed.