forked from RustPython/RustPython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathselect.rs
More file actions
396 lines (347 loc) · 12.2 KB
/
select.rs
File metadata and controls
396 lines (347 loc) · 12.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
28
8000
4
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
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())
}
}
}
}