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Convert vesad to be handle based, allow O_NONBLOCK

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This commit is contained in:
Jeremy Soller
2017-04-18 21:02:30 -06:00
parent 1e7013915b
commit b3849ddf36
5 changed files with 151 additions and 61 deletions
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vesad/src/main.rs
+5 -5
View File
@@ -7,7 +7,7 @@ extern crate alloc;
extern crate orbclient;
extern crate syscall;
use std::{env, mem};
use std::env;
use std::fs::File;
use std::io::{Read, Write};
use syscall::{physmap, physunmap, Packet, SchemeMut, EVENT_READ, MAP_WRITE, MAP_WRITE_COMBINE};
@@ -68,7 +68,7 @@ fn main() {
socket.read(&mut packet).expect("vesad: failed to read display scheme");
// If it is a read packet, and there is no data, block it. Otherwise, handle packet
if packet.a == syscall::number::SYS_READ && packet.d > 0 && scheme.will_block(packet.b) {
if packet.a == syscall::number::SYS_READ && packet.d > 0 && scheme.can_read(packet.b).is_none() {
blocked.push(packet);
} else {
scheme.handle(&mut packet);
@@ -79,7 +79,7 @@ fn main() {
{
let mut i = 0;
while i < blocked.len() {
if ! scheme.will_block(blocked[i].b) {
if scheme.can_read(blocked[i].b).is_some() {
let mut packet = blocked.remove(i);
scheme.handle(&mut packet);
socket.write(&packet).expect("vesad: failed to write display scheme");
@@ -90,7 +90,7 @@ fn main() {
}
for (screen_id, screen) in scheme.screens.iter() {
if ! screen.will_block() {
if let Some(count) = screen.can_read() {
let event_packet = Packet {
id: 0,
pid: 0,
@@ -99,7 +99,7 @@ fn main() {
a: syscall::number::SYS_FEVENT,
b: *screen_id,
c: EVENT_READ,
d: mem::size_of::<orbclient::Event>()
d: count
};
socket.write(&event_packet).expect("vesad: failed to write display event");
vesad/src/scheme.rs
+131 -51
View File
@@ -2,16 +2,30 @@ use std::collections::BTreeMap;
use std::{mem, slice, str};
use orbclient::{Event, EventOption};
use syscall::{Result, Error, EACCES, EBADF, ENOENT, SchemeMut};
use syscall::{Result, Error, EACCES, EBADF, ENOENT, O_NONBLOCK, SchemeMut};
use display::Display;
use screen::{Screen, GraphicScreen, TextScreen};
#[derive(Clone)]
enum HandleKind {
Input,
Screen(usize),
}
#[derive(Clone)]
struct Handle {
kind: HandleKind,
flags: usize,
}
pub struct DisplayScheme {
width: usize,
height: usize,
active: usize,
pub screens: BTreeMap<usize, Box<Screen>>
pub screens: BTreeMap<usize, Box<Screen>>,
next_id: usize,
handles: BTreeMap<usize, Handle>,
}
impl DisplayScheme {
@@ -32,37 +46,67 @@ impl DisplayScheme {
width: width,
height: height,
active: 1,
screens: screens
screens: screens,
next_id: 0,
handles: BTreeMap::new(),
}
}
pub fn will_block(&self, id: usize) -> bool {
if let Some(screen) = self.screens.get(&id) {
screen.will_block()
} else {
false
pub fn can_read(&self, id: usize) -> Option<usize> {
if let Some(handle) = self.handles.get(&id) {
if let HandleKind::Screen(screen_i) = handle.kind {
if let Some(screen) = self.screens.get(&screen_i) {
match screen.can_read() {
Some(count) => return Some(count),
None => if handle.flags & O_NONBLOCK == O_NONBLOCK {
return Some(0);
} else {
return None;
}
}
}
}
}
Some(0)
}
}
impl SchemeMut for DisplayScheme {
fn open(&mut self, path: &[u8], _flags: usize, uid: u32, _gid: u32) -> Result<usize> {
fn open(&mut self, path: &[u8], flags: usize, uid: u32, _gid: u32) -> Result<usize> {
if path == b"input" {
if uid == 0 {
Ok(0)
let id = self.next_id;
self.next_id += 1;
self.handles.insert(id, Handle {
kind: HandleKind::Input,
flags: flags
});
Ok(id)
} else {
Err(Error::new(EACCES))
}
} else {
let path_str = str::from_utf8(path).unwrap_or("").trim_matches('/');
let mut parts = path_str.split('/');
let id = parts.next().unwrap_or("").parse::<usize>().unwrap_or(0);
if self.screens.contains_key(&id) {
let screen_i = parts.next().unwrap_or("").parse::<usize>().unwrap_or(0);
if self.screens.contains_key(&screen_i) {
for cmd in parts {
if cmd == "activate" {
self.active = id;
self.active = screen_i;
}
}
let id = self.next_id;
self.next_id += 1;
self.handles.insert(id, Handle {
kind: HandleKind::Screen(screen_i),
flags: flags
});
Ok(id)
} else {
Err(Error::new(ENOENT))
@@ -71,32 +115,52 @@ impl SchemeMut for DisplayScheme {
}
fn dup(&mut self, id: usize, _buf: &[u8]) -> Result<usize> {
Ok(id)
let handle = self.handles.get(&id).map(|handle| handle.clone()).ok_or(Error::new(EBADF))?;
let new_id = self.next_id;
self.next_id += 1;
self.handles.insert(new_id, handle.clone());
Ok(new_id)
}
fn fevent(&mut self, id: usize, flags: usize) -> Result<usize> {
if let Some(mut screen) = self.screens.get_mut(&id) {
screen.event(flags).and(Ok(id))
} else {
Err(Error::new(EBADF))
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
if let HandleKind::Screen(screen_i) = handle.kind {
if let Some(mut screen) = self.screens.get_mut(&screen_i) {
return screen.event(flags).and(Ok(screen_i));
}
}
Err(Error::new(EBADF))
}
fn fmap(&mut self, id: usize, offset: usize, size: usize) -> Result<usize> {
if let Some(screen) = self.screens.get(&id) {
screen.map(offset, size)
} else {
Err(Error::new(EBADF))
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
if let HandleKind::Screen(screen_i) = handle.kind {
if let Some(screen) = self.screens.get(&screen_i) {
return screen.map(offset, size);
}
}
Err(Error::new(EBADF))
}
fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
let path_str = if id == 0 {
format!("display:input/{}/{}", self.width, self.height)
} else if let Some(screen) = self.screens.get(&id) {
format!("display:{}/{}/{}", id, screen.width(), screen.height())
} else {
return Err(Error::new(EBADF));
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
let path_str = match handle.kind {
HandleKind::Input => {
format!("display:input/{}/{}", self.width, self.height)
},
HandleKind::Screen(screen_i) => if let Some(screen) = self.screens.get(&screen_i) {
format!("display:{}/{}/{}", screen_i, screen.width(), screen.height())
} else {
return Err(Error::new(EBADF));
}
};
let path = path_str.as_bytes();
@@ -111,27 +175,37 @@ impl SchemeMut for DisplayScheme {
}
fn fsync(&mut self, id: usize) -> Result<usize> {
if let Some(mut screen) = self.screens.get_mut(&id) {
if id == self.active {
screen.sync();
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
if let HandleKind::Screen(screen_i) = handle.kind {
if let Some(mut screen) = self.screens.get_mut(&screen_i) {
if screen_i == self.active {
screen.sync();
}
return Ok(0);
}
Ok(0)
} else {
Err(Error::new(EBADF))
}
Err(Error::new(EBADF))
}
fn read(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
if let Some(mut screen) = self.screens.get_mut(&id) {
screen.read(buf)
} else {
Err(Error::new(EBADF))
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
if let HandleKind::Screen(screen_i) = handle.kind {
if let Some(mut screen) = self.screens.get_mut(&screen_i) {
return screen.read(buf);
}
}
Err(Error::new(EBADF))
}
fn write(&mut self, id: usize, buf: &[u8]) -> Result<usize> {
if id == 0 {
if buf.len() == 1 && buf[0] >= 0xF4 {
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
match handle.kind {
HandleKind::Input => if buf.len() == 1 && buf[0] >= 0xF4 {
let new_active = (buf[0] - 0xF4) as usize + 1;
if let Some(mut screen) = self.screens.get_mut(&new_active) {
self.active = new_active;
@@ -158,9 +232,9 @@ impl SchemeMut for DisplayScheme {
},
EventOption::Resize(resize_event) => {
println!("Resizing to {}, {}", resize_event.width, resize_event.height);
for (screen_id, screen) in self.screens.iter_mut() {
for (screen_i, screen) in self.screens.iter_mut() {
screen.resize(resize_event.width as usize, resize_event.height as usize);
if *screen_id == self.active {
if *screen_i == self.active {
screen.redraw();
}
}
@@ -181,23 +255,29 @@ impl SchemeMut for DisplayScheme {
}
Ok(events.len() * mem::size_of::<Event>())
},
HandleKind::Screen(screen_i) => if let Some(mut screen) = self.screens.get_mut(&screen_i) {
screen.write(buf, screen_i == self.active)
} else {
Err(Error::new(EBADF))
}
} else if let Some(mut screen) = self.screens.get_mut(&id) {
screen.write(buf, id == self.active)
} else {
Err(Error::new(EBADF))
}
}
fn seek(&mut self, id: usize, pos: usize, whence: usize) -> Result<usize> {
if let Some(mut screen) = self.screens.get_mut(&id) {
screen.seek(pos, whence)
} else {
Err(Error::new(EBADF))
let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
if let HandleKind::Screen(screen_i) = handle.kind {
if let Some(mut screen) = self.screens.get_mut(&screen_i) {
return screen.seek(pos, whence);
}
}
Err(Error::new(EBADF))
}
fn close(&mut self, _id: usize) -> Result<usize> {
fn close(&mut self, id: usize) -> Result<usize> {
self.handles.remove(&id).ok_or(Error::new(EBADF))?;
Ok(0)
}
}
vesad/src/screen/graphic.rs
+6 -2
View File
@@ -75,8 +75,12 @@ impl Screen for GraphicScreen {
Ok(i * mem::size_of::<Event>())
}
fn will_block(&self) -> bool {
self.input.is_empty()
fn can_read(&self) -> Option<usize> {
if self.input.is_empty() {
None
} else {
Some(self.input.len() * mem::size_of::<Event>())
}
}
fn write(&mut self, buf: &[u8], sync: bool) -> Result<usize> {
vesad/src/screen/mod.rs
+1 -1
View File
@@ -22,7 +22,7 @@ pub trait Screen {
fn read(&mut self, buf: &mut [u8]) -> Result<usize>;
fn will_block(&self) -> bool;
fn can_read(&self) -> Option<usize>;
fn write(&mut self, buf: &[u8], sync: bool) -> Result<usize>;
vesad/src/screen/text.rs
+8 -2
View File
@@ -167,8 +167,14 @@ impl Screen for TextScreen {
Ok(i)
}
fn will_block(&self) -> bool {
self.input.is_empty() && ! self.end_of_input
fn can_read(&self) -> Option<usize> {
if self.end_of_input {
Some(0)
} else if self.input.is_empty() {
None
} else {
Some(self.input.len())
}
}
fn write(&mut self, buf: &[u8], sync: bool) -> Result<usize> {