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select.rs
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use crate::vm::{
builtins::PyListRef, PyObject, PyObjectRef, PyResult, TryFromObject, VirtualMachine,
};
use std::{io, mem};
pub(crate) fn make_module(vm: &VirtualMachine) -> PyObjectRef {
#[cfg(windows)]
crate::vm::stdlib::nt::init_winsock();
#[cfg(unix)]
{
use crate::vm::class::PyClassImpl;
decl::poll::PyPoll::make_class(&vm.ctx);
}
decl::make_module(vm)
}
#[cfg(unix)]
mod platform {
pub use libc::{fd_set, select, timeval, FD_ISSET, FD_SET, FD_SETSIZE, FD_ZERO};
pub use std::os::unix::io::RawFd;
pub fn check_err(x: i32) -> bool {
x < 0
}
}
#[allow(non_snake_case)]
#[cfg(windows)]
mod platform {
use winapi::um::winsock2;
pub use winsock2::{fd_set, select, timeval, FD_SETSIZE, SOCKET as RawFd};
// based off winsock2.h: https://gist.github.com/piscisaureus/906386#file-winsock2-h-L128-L141
pub unsafe fn FD_SET(fd: RawFd, set: *mut fd_set) {
let mut slot = std::ptr::addr_of_mut!((*set).fd_array).cast::<RawFd>();
let fd_count = (*set).fd_count;
for _ in 0..fd_count {
if *slot == fd {
return;
}
slot = slot.add(1);
}
// slot == &fd_array[fd_count] at this point
if fd_count < FD_SETSIZE as u32 {
*slot = fd as RawFd;
(*set).fd_count += 1;
}
}
pub unsafe fn FD_ZERO(set: *mut fd_set) {
(*set).fd_count = 0;
}
pub unsafe fn FD_ISSET(fd: RawFd, set: *mut fd_set) -> bool {
use winapi::um::winsock2::__WSAFDIsSet;
__WSAFDIsSet(fd as _, set) != 0
}
pub fn check_err(x: i32) -> bool {
x == winsock2::SOCKET_ERROR
}
}
pub use platform::timeval;
use platform::RawFd;
struct Selectable {
obj: PyObjectRef,
fno: RawFd,
}
impl TryFromObject for Selectable {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let fno = obj.try_to_value(vm).or_else(|_| {
let meth = vm.get_method_or_type_error(
obj.clone(),
vm.ctx.interned_str("fileno").unwrap(),
|| "select arg must be an int or object with a fileno() method".to_owned(),
)?;
vm.invoke(&meth, ())?.try_into_value(vm)
})?;
Ok(Selectable { obj, fno })
}
}
// Keep it in a MaybeUninit, since on windows FD_ZERO doesn't actually zero the whole thing
#[repr(transparent)]
pub struct FdSet(mem::MaybeUninit<platform::fd_set>);
impl FdSet {
pub fn new() -> FdSet {
// it's just ints, and all the code that's actually
// interacting with it is in C, so it's safe to zero
let mut fdset = std::mem::MaybeUninit::zeroed();
unsafe { platform::FD_ZERO(fdset.as_mut_ptr()) };
FdSet(fdset)
}
pub fn insert(&mut self, fd: RawFd) {
unsafe { platform::FD_SET(fd, self.0.as_mut_ptr()) };
}
pub fn contains(&mut self, fd: RawFd) -> bool {
unsafe { platform::FD_ISSET(fd, self.0.as_mut_ptr()) }
}
pub fn clear(&mut self) {
unsafe { platform::FD_ZERO(self.0.as_mut_ptr()) };
}
pub fn highest(&mut self) -> Option<RawFd> {
(0..platform::FD_SETSIZE as RawFd)
.rev()
.find(|&i| self.contains(i))
}
}
pub fn select(
nfds: libc::c_int,
readfds: &mut FdSet,
writefds: &mut FdSet,
errfds: &mut FdSet,
timeout: Option<&mut timeval>,
) -> io::Result<i32> {
let timeout = match timeout {
Some(tv) => tv as *mut timeval,
None => std::ptr::null_mut(),
};
let ret = unsafe {
platform::select(
nfds,
readfds.0.as_mut_ptr(),
writefds.0.as_mut_ptr(),
errfds.0.as_mut_ptr(),
timeout,
)
};
if platform::check_err(ret) {
Err(io::Error::last_os_error())
} else {
Ok(ret)
}
}
fn sec_to_timeval(sec: f64) -> timeval {
timeval {
tv_sec: sec.trunc() as _,
tv_usec: (sec.fract() * 1e6) as _,
}
}
#[pymodule(name = "select")]
mod decl {
use super::*;
use crate::vm::{
builtins::PyTypeRef,
convert::ToPyException,
function::{Either, OptionalOption},
stdlib::time,
PyObjectRef, PyResult, VirtualMachine,
};
#[pyattr]
fn error(vm: &VirtualMachine) -> PyTypeRef {
vm.ctx.exceptions.os_error.to_owned()
}
#[pyfunction]
fn select(
rlist: PyObjectRef,
wlist: PyObjectRef,
xlist: PyObjectRef,
timeout: OptionalOption<Either<f64, isize>>,
vm: &VirtualMachine,
) -> PyResult<(PyListRef, PyListRef, PyListRef)> {
let mut timeout = timeout.flatten().map(|e| match e {
Either::A(f) => f,
Either::B(i) => i as f64,
});
if let Some(timeout) = timeout {
if timeout < 0.0 {
return Err(vm.new_value_error("timeout must be positive".to_owned()));
}
}
let deadline = timeout.map(|s| time::time(vm).unwrap() + s);
let seq2set = |list: &PyObject| -> PyResult<(Vec<Selectable>, FdSet)> {
let v: Vec<Selectable> = list.try_to_value(vm)?;
let mut fds = FdSet::new();
for fd in &v {
fds.insert(fd.fno);
}
Ok((v, fds))
};
let (rlist, mut r) = seq2set(&rlist)?;
let (wlist, mut w) = seq2set(&wlist)?;
let (xlist, mut x) = seq2set(&xlist)?;
if rlist.is_empty() && wlist.is_empty() && xlist.is_empty() {
let empty = vm.ctx.new_list(vec![]);
return Ok((empty.clone(), empty.clone(), empty));
}
let nfds: i32 = [&mut r, &mut w, &mut x]
.iter_mut()
.filter_map(|set| set.highest())
.max()
.map_or(0, |n| n + 1) as _;
loop {
let mut tv = timeout.map(sec_to_timeval);
let res = super::select(nfds, &mut r, &mut w, &mut x, tv.as_mut());
match res {
Ok(_) => break,
Err(err) if err.kind() == io::ErrorKind::Interrupted => {}
Err(err) => return Err(err.to_pyexception(vm)),
}
vm.check_signals()?;
if let Some(ref mut timeout) = timeout {
*timeout = deadline.unwrap() - time::time(vm).unwrap();
if *timeout < 0.0 {
r.clear();
w.clear();
x.clear();
break;
}
// retry select() if we haven't reached the deadline yet
}
}
let set2list = |list: Vec<Selectable>, mut set: FdSet| {
vm.ctx.new_list(
list.into_iter()
.filter(|fd| set.contains(fd.fno))
.map(|fd| fd.obj)
.collect(),
)
};
let rlist = set2list(rlist, r);
let wlist = set2list(wlist, w);
let xlist = set2list(xlist, x);
Ok((rlist, wlist, xlist))
}
#[cfg(unix)]
#[pyfunction]
fn poll() -> poll::PyPoll {
poll::PyPoll::default()
}
#[cfg(unix)]
#[pyattr]
use libc::{POLLERR, POLLHUP, POLLIN, POLLNVAL, POLLOUT, POLLPRI};
#[cfg(unix)]
pub(super) mod poll {
use super::*;
use crate::vm::{
builtins::PyFloat, common::lock::PyMutex, convert::ToPyObject, function::OptionalArg,
stdlib::io::Fildes, AsObject, PyPayload,
};
use libc::pollfd;
use num_traits::ToPrimitive;
use std::time;
#[pyclass(module = "select", name = "poll")]
#[derive(Default, Debug, PyPayload)]
pub struct PyPoll {
// keep sorted
fds: PyMutex<Vec<pollfd>>,
}
#[inline]
fn search(fds: &[pollfd], fd: i32) -> Result<usize, usize> {
fds.binary_search_by_key(&fd, |pfd| pfd.fd)
}
fn insert_fd(fds: &mut Vec<pollfd>, fd: i32, events: i16) {
match search(fds, fd) {
Ok(i) => fds[i].events = events,
Err(i) => fds.insert(
i,
pollfd {
fd,
events,
revents: 0,
},
),
}
}
fn get_fd_mut(fds: &mut [pollfd], fd: i32) -> Option<&mut pollfd> {
search(fds, fd).ok().map(move |i| &mut fds[i])
}
fn remove_fd(fds: &mut Vec<pollfd>, fd: i32) -> Option<pollfd> {
search(fds, fd).ok().map(|i| fds.remove(i))
}
const DEFAULT_EVENTS: i16 = libc::POLLIN | libc::POLLPRI | libc::POLLOUT;
#[pyclass]
impl PyPoll {
#[pymethod]
fn register(&self, Fildes(fd): Fildes, eventmask: OptionalArg<u16>) {
insert_fd(
&mut self.fds.lock(),
fd,
eventmask.map_or(DEFAULT_EVENTS, |e| e as i16),
)
}
#[pymethod]
fn modify(&self, Fildes(fd): Fildes, eventmask: u16) -> io::Result<()> {
let mut fds = self.fds.lock();
let pfd = get_fd_mut(&mut fds, fd)
.ok_or_else(|| io::Error::from_raw_os_error(libc::ENOENT))?;
pfd.events = eventmask as i16;
Ok(())
}
#[pymethod]
fn unregister(&self, Fildes(fd): Fildes, vm: &VirtualMachine) -> PyResult<()> {
let removed = remove_fd(&mut self.fds.lock(), fd);
removed
.map(drop)
.ok_or_else(|| vm.new_key_error(vm.ctx.new_int(fd).into()))
}
#[pymethod]
fn poll(
&self,
timeout: OptionalOption,
vm: &VirtualMachine,
) -> PyResult<Vec<PyObjectRef>> {
let mut fds = self.fds.lock();
let timeout_ms = match timeout.flatten() {
Some(ms) => {
let ms = if let Some(float) = ms.payload::<PyFloat>() {
float.to_f64().to_i32()
} else if let Some(int) = ms.try_index_opt(vm) {
int?.as_bigint().to_i32()
} else {
return Err(vm.new_type_error(format!(
"expected an int or float for duration, got {}",
ms.class()
)));
};
ms.ok_or_else(|| vm.new_value_error("value out of range".to_owned()))?
}
None => -1,
};
let timeout_ms = if timeout_ms < 0 { -1 } else { timeout_ms };
let deadline = (timeout_ms >= 0)
.then(|| time::Instant::now() + time::Duration::from_millis(timeout_ms as u64));
let mut poll_timeout = timeout_ms;
loop {
let res = unsafe { libc::poll(fds.as_mut_ptr(), fds.len() as _, poll_timeout) };
let res = if res < 0 {
Err(io::Error::last_os_error())
} else {
Ok(())
};
match res {
Ok(()) => break,
Err(e) if e.kind() == io::ErrorKind::Interrupted => {
vm.check_signals()?;
if let Some(d) = deadline {
match d.checked_duration_since(time::Instant::now()) {
Some(remaining) => poll_timeout = remaining.as_millis() as i32,
// we've timed out
None => break,
}
}
}
Err(e) => return Err(e.to_pyexception(vm)),
}
}
Ok(fds
.iter()
.filter(|pfd| pfd.revents != 0)
.map(|pfd| (pfd.fd, pfd.revents & 0xfff).to_pyobject(vm))
.collect())
}
}
}
}