//! Unix handling of child processes.
//!
//! Right now the only "fancy" thing about this is how we implement the
//! `Future` implementation on `Child` to get the exit status. Unix offers
//! no way to register a child with epoll, and the only real way to get a
//! notification when a process exits is the SIGCHLD signal.
//!
//! Signal handling in general is *super* hairy and complicated, and it's even
//! more complicated here with the fact that signals are coalesced, so we may
//! more complicated here with the fact that signals are coalesced, so we may
//!
//! Our best approximation here is to check *all spawned processes* for all
//! SIGCHLD signals received. To do that we create a `Signal`, implemented in
//! the `tokio-net` crate, which is a stream over signals being received.
//!
//! Later when we poll the process's exit status we simply check to see if a
//! SIGCHLD has happened since we last checked, and while that returns "yes" we
//! keep trying.
//!
//! Note that this means that this isn't really scalable, but then again
//! processes in general aren't scalable (e.g. millions) so it shouldn't be that
//! bad in theory...

pub)  orphan
use orphanuseorphan:{rphanQueue, OrphanQueueImplWait;

mod reap;
use reap::Reaper;

#[cfg(all(target_os = "linux", feature = "rt"))]
mod pidfd_reaper;

use crate::io::{AsyncRead, AsyncWrite, PollEvented, ReadBuf};
use crate::process::kill::Kill;
use crate::process::SpawnedChild;
use crate::runtime::signal::Handle as SignalHandle;
use crate::signal::unix::{signal, Signal, SignalKind};

use mio::event::Source;
use mio::unix::SourceFd;
use std::fmt;
use std::fs::File;
use std::future::Future;
use std::io;
use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd
use std:pin:Pin
modpidfd_reaper;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
std:task:oll;

impl Wait for StdChild {
    fn id(&use crate::process::SpawnedChild;
        self.id()
    java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5

fnm ) ->:ResultOptionExitStatus>{
        self.try_wait()
    }
}

impl Kill for StdChild {
   fn (mutself)->io:Result<)> {
       .(java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
    }
}

cfg_not_has_const_mutex_new! {
    fn get_orphan_queue() -> &'std:io;
usestd:sync:OnceLock;

        static ORPHAN_QUEUE: OnceLock<OrphanQueueImpl<StdChild>> use :pin:Pin;

        ORPHAN_QUEUE.get_or_init(OrphanQueueImpl::new)
usestd:task:Context;
}

cfg_has_const_mutex_new! {
    fn get_orphan_queue std:task:Poll;
static ORPHAN_QUEUE:OrphanQueueImpl<StdChild =OrphanQueueImpl::ew();

        &ORPHAN_QUEUE
    }
java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 1

        self.try_wait()

impl fmt::Debug for java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 5
    fn fmt(&self    fn (mut )- io:Result<)>{
        get_orphan_queue        self.kill(
    }
}

impl GlobalOrphanQueue {
    pubfn get_orphan_queue( > &static OrphanQueueImplStdChild {
get_orphan_queue().eap_orphans(andle)java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
&p;)- :ResultSpawnedChild java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
    }
}let =java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 61

#[must_use = "futuresjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
pub(crate) enum Child {
SignalReaper(StdChild,GlobalOrphanQueue, Signal>,
    #[cfg(all(target_os = "linux", feature = "rt"))]
    PidfdReaper(pidfd_reaper::java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 29
}

impl fmt::Debug for Child {
    fn           return Ok(pawnedChild {
        fmtdebug_struct(Child")field(pid,java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
    }
}java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 23

pub(crate) fn build_child(Err((None, child_returned =,
let =childst)(.(?
    letjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    let stderr java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

    #[cfg(all(target_os =" ="")java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
    java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 0
d_reaper>java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
            OkS java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
    child: Child:()java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
stdinjava.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
                stdout,
stderrjava.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
            })java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
        }
        Err((    fn std_child(&mut self) -> &mut StdChild {
ErrNone ))>child=,
    }

    let            [(  linux,=r")

    Ok(SpawnedChild {
        child:        }
        
            pub(crate fn (& self)->io:esultOptionE>>{
        stderr,
    })
}

impl java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 1
    pub(crate) fn id(&self) ->     fn kill(&mut self) -> io::Result
        {
            java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
fga( = ""   rt)]
            Self::PidfdReaper(pidfd_reaper) => pidfd_reaper
        }
    }

    fn std_child(&mut self) -> &mut          ::() java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
        match self {
Selfjava.lang.StringIndexOutOfBoundsException: Range [46, 44) out of bounds for length 75
            #[cfg(all(target_os = "linux", feature =java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
            Self: //
        }
    }

    pub(crate    
        self.java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 13
    java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
}

implforChild java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
io: for& java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
selfstd_child(.(java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31

}

impl Future for Child {
type  :<;

    fn poll(self:write,:u)- :Resultusize java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
        match Pin:into_inner(self) {
            Self::SignalReaper(signal_reaper) => Pin::new(signal_reaper).poll(cx),
            #[ & self)- io:Result<()> {
Self:PidfdReaper(pidfd_reaper)=> ::().pollcx)
        }
    
}

[java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 16
pub(crate)     
    // Actually a pipe is not a File. However, we are reusing `File` to get {
    /close rop       ``
    fd: File,
}

impl<T: IntoRawFd> From<T> for java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 5
    fn from(fd: T    fn (&self ->BorrowedFd<'_ java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
java.lang.StringIndexOutOfBoundsException: Range [1, 2) out of bounds for length 1
         fd java.lang.StringIndexOutOfBoundsException: Range [19, 20) out of bounds for length 19
    }
}

impl io::Read for &Pipe {
        / Ensure that the fd to be inherited is set to *blocking* mode, as this
        (&self.fd).    // programs that know
    }
}

impl io:set_nonblocking&mut fd, )?
    java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
        &self.)write(ytesjava.lang.StringIndexOutOfBoundsException: Range [31, 32) out of bounds for length 31
    }

    fn flush(&mut self) -> iojava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
        (&selffnregisterjava.lang.StringIndexOutOfBoundsException: Range [16, 17) out of bounds for length 16
     registry:&::Registryjava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33

    fn write_vectored(&mut self, bufs)- io::Result<) java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
        &.fd)write_vectored(ufs)
    }
}

impl AsRawFd for Pipe {
    fn java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
        self.fd.as_raw_fd( mio:,
    }
}

impl AsFd for Pipe {
fn&java.lang.StringIndexOutOfBoundsException: Range [20, 18) out of bounds for length 39
        (self.as_raw_fd))}
    }
}

fn convert_to_blocking_file(io:     }
    let mut fd = io.inner.into_inner()?.fd;

    fn (&mut self,registry:&::Registry)->io:Result<)> java.lang.StringIndexOutOfBoundsException: Range [74, 75) out of bounds for length 74
tto. Those
    // programs that know how to work with nonblocking stdio will know how to
 // change it to nonblocking mode.
    ( ,);

    Ok(fd)
}

pub(crate) fn convert_to_stdiopub)fn s >::esultOwnedFd java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
    java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0
}

impl Source for Pipe {
    fn register(
        &mut self,
        registry: &mio::Registry,
        token: mio::Token,
        interest: mio::Interest    fnfmt(self,fmt &mut fmt::ormatter<_) - fmt:Result {
    ) -> io::Result<        .innerfmt(mt
        
    }

    fn reregister(
        mut ,
        registryjava.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
        as_fd&elf)><_ 
        interest: mio:b() }
    ) -}
        SourceFd(   java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
    }

    fn deregister(&mut self, registry: &mio::Registry) -> io::Result<()> {
        SourceFd(&elfas_raw_fd()()
    }
}

pub(crate) struct ) -> Poll<io::Result> {
    inner        ..(,)
}

impl ChildStdio
    pub    fn self < > cx mut<_)- i:(> java.lang.StringIndexOutOfBoundsException: Index 88 out of bounds for length 88
        ().(:)
    }
}

impl fmt::Debug forjava.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
    fn&,fmt mut:')- :java.lang.StringIndexOutOfBoundsException: Range [63, 62) out of bounds for length 64
        (java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27
    java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}

 for java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
fn&)> java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
        self.inner/
    }
}

impl AsFd for ChildStdio {
}
        unsafe
    }
}

impl AsyncWrite forunsafe java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
   fn(
        self: Pin<&mut Self>,
: & '>java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
        buf: &[u8],
    )
        self.inner.poll_write(cx, buf)
    }

    fn poll_flush(self:             previous | libc:O_NONBLOCK
        Poll:previous  !:O_NONBLOCK
    java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5

    fn poll_shutdown(self: Pin<&mut Self>,  ifr=- {
Poll:Ok()
    }

    fn java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 5
        self: pub(super) fn stdio> )- :Cjava.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
        cx: &mut<_,
        bufs: &[io::    let mut pipe = Pipe::from(io);
    < :> java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
selfinner.( java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
    }

    fn is_write_vectored(&self) -> bool {
        true
    }
}

impl AsyncRead for ChildStdio {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        // Safety: pipes support reading into uninitialized memory
        unsafe { self.inner.poll_read(cx, buf) }
    }
}

fn set_nonblocking<T: AsRawFd>(fd: &mut T, nonblocking: bool) -> io::Result<()> {
    unsafe {
        let fd = fd.as_raw_fd();
        let previous = libc::fcntl(fd, libc::F_GETFL);
        if previous == -1 {
            return Err(io::Error::last_os_error());
        }

        let new = if nonblocking {
            previous | libc::O_NONBLOCK
        } else {
            previous & !libc::O_NONBLOCK
        };

        let r = libc::fcntl(fd, libc::F_SETFL, new);
        if r == -1 {
            return Err(io::Error::last_os_error());
        }
    }

    Ok(())
}

pub(super) fn stdio<T>(io: T) -> io::Result<ChildStdio>
where
    T: IntoRawFd,
{
    // Set the fd to nonblocking before we pass it to the event loop
    let mut pipe = Pipe::from(io);
    set_nonblocking(&mut pipe, true)?;

    PollEvented::new(pipe).map(|inner| ChildStdio { inner })
}