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use crate::Result;
use crate::errno::Errno;
use libc::{self, c_int};
use std::os::unix::io::RawFd;
use std::ptr;
use std::mem;
use crate::Error;
libc_bitflags!(
pub struct EpollFlags: c_int {
EPOLLIN;
EPOLLPRI;
EPOLLOUT;
EPOLLRDNORM;
EPOLLRDBAND;
EPOLLWRNORM;
EPOLLWRBAND;
EPOLLMSG;
EPOLLERR;
EPOLLHUP;
EPOLLRDHUP;
#[cfg(target_os = "linux")] // Added in 4.5; not in Android.
EPOLLEXCLUSIVE;
#[cfg(not(target_arch = "mips"))]
EPOLLWAKEUP;
EPOLLONESHOT;
EPOLLET;
}
);
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[repr(i32)]
pub enum EpollOp {
EpollCtlAdd = libc::EPOLL_CTL_ADD,
EpollCtlDel = libc::EPOLL_CTL_DEL,
EpollCtlMod = libc::EPOLL_CTL_MOD,
}
libc_bitflags!{
pub struct EpollCreateFlags: c_int {
EPOLL_CLOEXEC;
}
}
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[repr(transparent)]
pub struct EpollEvent {
event: libc::epoll_event,
}
impl EpollEvent {
pub fn new(events: EpollFlags, data: u64) -> Self {
EpollEvent { event: libc::epoll_event { events: events.bits() as u32, u64: data } }
}
pub fn empty() -> Self {
unsafe { mem::zeroed::<EpollEvent>() }
}
pub fn events(&self) -> EpollFlags {
EpollFlags::from_bits(self.event.events as c_int).unwrap()
}
pub fn data(&self) -> u64 {
self.event.u64
}
}
#[inline]
pub fn epoll_create() -> Result<RawFd> {
let res = unsafe { libc::epoll_create(1024) };
Errno::result(res)
}
#[inline]
pub fn epoll_create1(flags: EpollCreateFlags) -> Result<RawFd> {
let res = unsafe { libc::epoll_create1(flags.bits()) };
Errno::result(res)
}
#[inline]
pub fn epoll_ctl<'a, T>(epfd: RawFd, op: EpollOp, fd: RawFd, event: T) -> Result<()>
where T: Into<Option<&'a mut EpollEvent>>
{
let mut event: Option<&mut EpollEvent> = event.into();
if event.is_none() && op != EpollOp::EpollCtlDel {
Err(Error::Sys(Errno::EINVAL))
} else {
let res = unsafe {
if let Some(ref mut event) = event {
libc::epoll_ctl(epfd, op as c_int, fd, &mut event.event)
} else {
libc::epoll_ctl(epfd, op as c_int, fd, ptr::null_mut())
}
};
Errno::result(res).map(drop)
}
}
#[inline]
pub fn epoll_wait(epfd: RawFd, events: &mut [EpollEvent], timeout_ms: isize) -> Result<usize> {
let res = unsafe {
libc::epoll_wait(epfd, events.as_mut_ptr() as *mut libc::epoll_event, events.len() as c_int, timeout_ms as c_int)
};
Errno::result(res).map(|r| r as usize)
}
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