Struct DisplayScheme 

pub struct DisplayScheme {
    handles: RwLock<BTreeMap<u64, Handle>>,
    next: AtomicU64,
    screens: RwLock<BTreeMap<u32, Arc<RwLock<HeapScreen>>>>,
}

Fields

handles: RwLock<BTreeMap<u64, Handle>>

next: AtomicU64

screens: RwLock<BTreeMap<u32, Arc<RwLock<HeapScreen>>>>

Offscreen buffers keyed by display_id.

Implementations

impl DisplayScheme

fn new() -> Self

fn alloc_id(&self) -> u64

fn get_or_create_screen(&self, display_id: u32) -> Arc<RwLock<HeapScreen>>

Get or create the offscreen buffer for a display.

fn parse_display_path(path: &str) -> Option<u32>

Parse “display_id.screen_id” path to global display_id.

Trait Implementations

impl Scheme for DisplayScheme

fn open( &self, path: &str, _flags: OpenFlags, ) -> Result<OpenResult, SyscallError>

Open a file/resource at the given path within this scheme.

fn read( &self, fid: u64, offset: u64, buf: &mut [u8], ) -> Result<usize, SyscallError>

Read bytes from an open file.

fn write( &self, fid: u64, _offset: u64, buf: &[u8], ) -> Result<usize, SyscallError>

Write bytes to an open file.

fn close(&self, fid: u64) -> Result<(), SyscallError>

Close an open file.

fn stat(&self, fid: u64) -> Result<FileStat, SyscallError>

Get metadata for an open file.

fn readdir(&self, fid: u64) -> Result<Vec<DirEntry>, SyscallError>

Read directory entries from an open directory handle.

fn async_read( &self, file_id: u64, offset: u64, user_buf_vaddr: u64, len: usize, _ring_id: u64, _user_data: u64, ) -> Result<AsyncSubmitResult, SyscallError>

Submit a read against a userspace buffer for async I/O.

fn async_write( &self, file_id: u64, offset: u64, user_buf_vaddr: u64, len: usize, _ring_id: u64, _user_data: u64, ) -> Result<AsyncSubmitResult, SyscallError>

Submit a write sourced from a userspace buffer for async I/O.

fn size(&self, file_id: u64) -> Result<u64, SyscallError>

Get file size (if supported).

fn truncate(&self, file_id: u64, new_size: u64) -> Result<(), SyscallError>

Truncate/resize a file (if supported).

fn truncate_by_path( &self, _path: &str, _new_size: u64, ) -> Result<(), SyscallError>

Truncate a file by path (avoids open/close round-trip).

fn sync(&self, file_id: u64) -> Result<(), SyscallError>

Sync file to storage (if applicable).

fn create_file(&self, path: &str, mode: u32) -> Result<OpenResult, SyscallError>

Create a new regular file.

fn create_directory( &self, path: &str, mode: u32, ) -> Result<OpenResult, SyscallError>

Create a new directory.

fn unlink(&self, path: &str) -> Result<(), SyscallError>

Remove a file or directory.

fn rename(&self, old_path: &str, new_path: &str) -> Result<(), SyscallError>

Rename/move an entry within this scheme.

fn chmod(&self, path: &str, mode: u32) -> Result<(), SyscallError>

Change permission bits on a path.

fn fchmod(&self, file_id: u64, mode: u32) -> Result<(), SyscallError>

Change permission bits on an open file handle.

fn link(&self, old_path: &str, new_path: &str) -> Result<(), SyscallError>

Create a hard link.

fn symlink(&self, target: &str, link_path: &str) -> Result<(), SyscallError>

Create a symbolic link.

fn readlink(&self, path: &str) -> Result<String, SyscallError>

Read the target of a symbolic link.