1 use crate::Result;
2 use crate::errno::Errno;
3 use libc::{self, c_int};
4 use std::os::unix::io::RawFd;
5 use std::ptr;
6 use std::mem;
7
8 libc_bitflags!(
9 pub struct EpollFlags: c_int {
10 EPOLLIN;
11 EPOLLPRI;
12 EPOLLOUT;
13 EPOLLRDNORM;
14 EPOLLRDBAND;
15 EPOLLWRNORM;
16 EPOLLWRBAND;
17 EPOLLMSG;
18 EPOLLERR;
19 EPOLLHUP;
20 EPOLLRDHUP;
21 #[cfg(target_os = "linux")] // Added in 4.5; not in Android.
22 EPOLLEXCLUSIVE;
23 #[cfg(not(target_arch = "mips"))]
24 EPOLLWAKEUP;
25 EPOLLONESHOT;
26 EPOLLET;
27 }
28 );
29
30 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
31 #[repr(i32)]
32 #[non_exhaustive]
33 pub enum EpollOp {
34 EpollCtlAdd = libc::EPOLL_CTL_ADD,
35 EpollCtlDel = libc::EPOLL_CTL_DEL,
36 EpollCtlMod = libc::EPOLL_CTL_MOD,
37 }
38
39 libc_bitflags!{
40 pub struct EpollCreateFlags: c_int {
41 EPOLL_CLOEXEC;
42 }
43 }
44
45 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
46 #[repr(transparent)]
47 pub struct EpollEvent {
48 event: libc::epoll_event,
49 }
50
51 impl EpollEvent {
new(events: EpollFlags, data: u64) -> Self52 pub fn new(events: EpollFlags, data: u64) -> Self {
53 EpollEvent { event: libc::epoll_event { events: events.bits() as u32, u64: data } }
54 }
55
empty() -> Self56 pub fn empty() -> Self {
57 unsafe { mem::zeroed::<EpollEvent>() }
58 }
59
events(&self) -> EpollFlags60 pub fn events(&self) -> EpollFlags {
61 EpollFlags::from_bits(self.event.events as c_int).unwrap()
62 }
63
data(&self) -> u6464 pub fn data(&self) -> u64 {
65 self.event.u64
66 }
67 }
68
69 #[inline]
epoll_create() -> Result<RawFd>70 pub fn epoll_create() -> Result<RawFd> {
71 let res = unsafe { libc::epoll_create(1024) };
72
73 Errno::result(res)
74 }
75
76 #[inline]
epoll_create1(flags: EpollCreateFlags) -> Result<RawFd>77 pub fn epoll_create1(flags: EpollCreateFlags) -> Result<RawFd> {
78 let res = unsafe { libc::epoll_create1(flags.bits()) };
79
80 Errno::result(res)
81 }
82
83 #[inline]
epoll_ctl<'a, T>(epfd: RawFd, op: EpollOp, fd: RawFd, event: T) -> Result<()> where T: Into<Option<&'a mut EpollEvent>>84 pub fn epoll_ctl<'a, T>(epfd: RawFd, op: EpollOp, fd: RawFd, event: T) -> Result<()>
85 where T: Into<Option<&'a mut EpollEvent>>
86 {
87 let mut event: Option<&mut EpollEvent> = event.into();
88 if event.is_none() && op != EpollOp::EpollCtlDel {
89 Err(Errno::EINVAL)
90 } else {
91 let res = unsafe {
92 if let Some(ref mut event) = event {
93 libc::epoll_ctl(epfd, op as c_int, fd, &mut event.event)
94 } else {
95 libc::epoll_ctl(epfd, op as c_int, fd, ptr::null_mut())
96 }
97 };
98 Errno::result(res).map(drop)
99 }
100 }
101
102 #[inline]
epoll_wait(epfd: RawFd, events: &mut [EpollEvent], timeout_ms: isize) -> Result<usize>103 pub fn epoll_wait(epfd: RawFd, events: &mut [EpollEvent], timeout_ms: isize) -> Result<usize> {
104 let res = unsafe {
105 libc::epoll_wait(epfd, events.as_mut_ptr() as *mut libc::epoll_event, events.len() as c_int, timeout_ms as c_int)
106 };
107
108 Errno::result(res).map(|r| r as usize)
109 }
110