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
use std::cell::RefCell;
use std::io;
use std::os::raw::c_int;
use std::os::unix::io::AsRawFd;
use std::rc::Rc;
use mio::{Evented, Poll, PollOpt, Ready, Token};
use nix::sys::signal::SigSet;
pub use nix::sys::signal::Signal;
pub use nix::sys::signalfd::siginfo;
use nix::sys::signalfd::{SfdFlags, SignalFd};
use {EventDispatcher, EventSource};
#[derive(Copy, Clone)]
pub struct Event {
info: siginfo,
}
impl Event {
pub fn signal(&self) -> Signal {
Signal::from_c_int(self.info.ssi_signo as c_int).unwrap()
}
pub fn full_info(&self) -> siginfo {
self.info
}
}
pub struct Signals {
sfd: Rc<RefCell<SignalFd>>,
mask: SigSet,
}
impl Signals {
pub fn new(signals: &[Signal]) -> io::Result<Signals> {
let mut mask = SigSet::empty();
for &s in signals {
mask.add(s);
}
mask.thread_block().map_err(no_nix_err)?;
let sfd = SignalFd::with_flags(&mask, SfdFlags::SFD_NONBLOCK | SfdFlags::SFD_CLOEXEC)
.map_err(no_nix_err)?;
Ok(Signals {
sfd: Rc::new(RefCell::new(sfd)),
mask,
})
}
pub fn add_signals(&mut self, signals: &[Signal]) -> io::Result<()> {
for &s in signals {
self.mask.add(s);
}
self.mask.thread_block().map_err(no_nix_err)?;
self.sfd
.borrow_mut()
.set_mask(&self.mask)
.map_err(no_nix_err)?;
Ok(())
}
pub fn remove_signals(&mut self, signals: &[Signal]) -> io::Result<()> {
let mut removed = SigSet::empty();
for &s in signals {
self.mask.remove(s);
removed.add(s);
}
removed.thread_unblock().map_err(no_nix_err)?;
self.sfd
.borrow_mut()
.set_mask(&self.mask)
.map_err(no_nix_err)?;
Ok(())
}
pub fn set_signals(&mut self, signals: &[Signal]) -> io::Result<()> {
let mut new_mask = SigSet::empty();
for &s in signals {
new_mask.add(s);
}
self.mask.thread_unblock().map_err(no_nix_err)?;
new_mask.thread_block().map_err(no_nix_err)?;
self.sfd
.borrow_mut()
.set_mask(&new_mask)
.map_err(no_nix_err)?;
self.mask = new_mask;
Ok(())
}
}
impl Drop for Signals {
fn drop(&mut self) {
if let Err(e) = self.mask.thread_unblock() {
eprintln!("[calloop] Failed to unmask signals: {:?}", e);
}
}
}
fn no_nix_err(err: ::nix::Error) -> io::Error {
match err {
::nix::Error::Sys(errno) => errno.into(),
_ => unreachable!(),
}
}
impl Evented for Signals {
fn register(
&self,
poll: &Poll,
token: Token,
interest: Ready,
opts: PollOpt,
) -> io::Result<()> {
::mio::unix::EventedFd(&self.sfd.borrow().as_raw_fd()).register(poll, token, interest, opts)
}
fn reregister(
&self,
poll: &Poll,
token: Token,
interest: Ready,
opts: PollOpt,
) -> io::Result<()> {
::mio::unix::EventedFd(&self.sfd.borrow().as_raw_fd())
.reregister(poll, token, interest, opts)
}
fn deregister(&self, poll: &Poll) -> io::Result<()> {
::mio::unix::EventedFd(&self.sfd.borrow().as_raw_fd()).deregister(poll)
}
}
impl EventSource for Signals {
type Event = Event;
fn interest(&self) -> Ready {
Ready::readable()
}
fn pollopts(&self) -> PollOpt {
PollOpt::edge()
}
fn make_dispatcher<Data: 'static, F: FnMut(Event, &mut Data) + 'static>(
&self,
callback: F,
) -> Rc<RefCell<EventDispatcher<Data>>> {
Rc::new(RefCell::new(Dispatcher {
_data: ::std::marker::PhantomData,
callback,
sfd: self.sfd.clone(),
}))
}
}
struct Dispatcher<Data, F: FnMut(Event, &mut Data) + 'static> {
_data: ::std::marker::PhantomData<fn(&mut Data)>,
callback: F,
sfd: Rc<RefCell<SignalFd>>,
}
impl<Data, F: FnMut(Event, &mut Data) + 'static> EventDispatcher<Data> for Dispatcher<Data, F> {
fn ready(&mut self, _: Ready, data: &mut Data) {
loop {
let ret = self.sfd.borrow_mut().read_signal();
match ret {
Ok(Some(info)) => (self.callback)(Event { info }, data),
Ok(None) => {
break;
}
Err(e) => {
eprintln!("[calloop] Error reading from signalfd: {:?}", e);
break;
}
}
}
}
}