nix/sys/
epoll.rs

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

nix/sys/
epoll.rs
