140 lines
4.1 KiB
Rust
140 lines
4.1 KiB
Rust
use alloc::arc::Arc;
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use alloc::boxed::Box;
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use collections::Vec;
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use spin::Mutex;
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use arch;
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use super::file::File;
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use super::memory::{Grant, Memory, SharedMemory};
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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pub enum Status {
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Runnable,
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Blocked,
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Exited(usize)
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}
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/// A context, which identifies either a process or a thread
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#[derive(Debug)]
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pub struct Context {
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/// The ID of this context
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pub id: usize,
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/// Status of context
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pub status: Status,
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/// Context running or not
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pub running: bool,
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/// The architecture specific context
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pub arch: arch::context::Context,
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/// Kernel FX
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pub kfx: Option<Box<[u8]>>,
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/// Kernel stack
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pub kstack: Option<Box<[u8]>>,
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/// Executable image
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pub image: Vec<SharedMemory>,
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/// User heap
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pub heap: Option<SharedMemory>,
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/// User stack
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pub stack: Option<Memory>,
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/// User grants
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pub grants: Arc<Mutex<Vec<Grant>>>,
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/// The current working directory
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pub cwd: Arc<Mutex<Vec<u8>>>,
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/// The open files in the scheme
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pub files: Arc<Mutex<Vec<Option<File>>>>
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}
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impl Context {
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/// Create a new context
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pub fn new(id: usize) -> Context {
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Context {
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id: id,
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status: Status::Blocked,
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running: false,
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arch: arch::context::Context::new(),
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kfx: None,
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kstack: None,
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image: Vec::new(),
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heap: None,
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stack: None,
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grants: Arc::new(Mutex::new(Vec::new())),
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cwd: Arc::new(Mutex::new(Vec::new())),
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files: Arc::new(Mutex::new(Vec::new()))
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}
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}
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pub fn canonicalize(&self, path: &[u8]) -> Vec<u8> {
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if path.iter().position(|&b| b == b':').is_none() {
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let cwd = self.cwd.lock();
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if path == b"." {
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cwd.clone()
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} else if path == b".." {
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cwd[..cwd[..cwd.len() - 1]
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.iter().rposition(|&b| b == b'/')
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.map_or(cwd.len(), |i| i + 1)]
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.to_vec()
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} else if path.starts_with(b"./") {
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let mut canon = cwd.clone();
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canon.extend_from_slice(&path[2..]);
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canon
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} else if path.starts_with(b"../") {
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let mut canon = cwd[..cwd[..cwd.len() - 1]
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.iter().rposition(|&b| b == b'/')
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.map_or(cwd.len(), |i| i + 1)]
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.to_vec();
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canon.extend_from_slice(&path[3..]);
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canon
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} else if path.starts_with(b"/") {
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let mut canon = cwd[..cwd.iter().position(|&b| b == b':').map_or(1, |i| i + 1)].to_vec();
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canon.extend_from_slice(&path);
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canon
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} else {
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let mut canon = cwd.clone();
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canon.extend_from_slice(&path);
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canon
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}
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} else {
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path.to_vec()
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}
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}
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/// Add a file to the lowest available slot.
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/// Return the file descriptor number or None if no slot was found
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pub fn add_file(&self, file: File) -> Option<usize> {
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let mut files = self.files.lock();
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for (i, mut file_option) in files.iter_mut().enumerate() {
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if file_option.is_none() {
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*file_option = Some(file);
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return Some(i);
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}
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}
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let len = files.len();
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if len < super::CONTEXT_MAX_FILES {
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files.push(Some(file));
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Some(len)
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} else {
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None
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}
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}
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/// Get a file
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pub fn get_file(&self, i: usize) -> Option<File> {
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let files = self.files.lock();
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if i < files.len() {
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files[i]
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} else {
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None
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}
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}
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/// Remove a file
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// TODO: adjust files vector to smaller size if possible
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pub fn remove_file(&self, i: usize) -> Option<File> {
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let mut files = self.files.lock();
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if i < files.len() {
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files[i].take()
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} else {
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None
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}
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}
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}
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