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|
pub use self::imp::read2;
#[cfg(unix)]
mod imp {
use std::io;
use std::io::prelude::*;
use std::mem;
use std::os::unix::prelude::*;
use std::process::{ChildStderr, ChildStdout};
pub fn read2(
mut out_pipe: ChildStdout,
mut err_pipe: ChildStderr,
data: &mut dyn FnMut(bool, &mut Vec<u8>, bool),
) -> io::Result<()> {
unsafe {
libc::fcntl(out_pipe.as_raw_fd(), libc::F_SETFL, libc::O_NONBLOCK);
libc::fcntl(err_pipe.as_raw_fd(), libc::F_SETFL, libc::O_NONBLOCK);
}
let mut out_done = false;
let mut err_done = false;
let mut out = Vec::new();
let mut err = Vec::new();
let mut fds: [libc::pollfd; 2] = unsafe { mem::zeroed() };
fds[0].fd = out_pipe.as_raw_fd();
fds[0].events = libc::POLLIN;
fds[1].fd = err_pipe.as_raw_fd();
fds[1].events = libc::POLLIN;
let mut nfds = 2;
let mut errfd = 1;
while nfds > 0 {
// wait for either pipe to become readable using `select`
let r = unsafe { libc::poll(fds.as_mut_ptr(), nfds, -1) };
if r == -1 {
let err = io::Error::last_os_error();
if err.kind() == io::ErrorKind::Interrupted {
continue;
}
return Err(err);
}
// Read as much as we can from each pipe, ignoring EWOULDBLOCK or
// EAGAIN. If we hit EOF, then this will happen because the underlying
// reader will return Ok(0), in which case we'll see `Ok` ourselves. In
// this case we flip the other fd back into blocking mode and read
// whatever's leftover on that file descriptor.
let handle = |res: io::Result<_>| match res {
Ok(_) => Ok(true),
Err(e) => {
if e.kind() == io::ErrorKind::WouldBlock {
Ok(false)
} else {
Err(e)
}
}
};
if !err_done && fds[errfd].revents != 0 && handle(err_pipe.read_to_end(&mut err))? {
err_done = true;
nfds -= 1;
}
data(false, &mut err, err_done);
if !out_done && fds[0].revents != 0 && handle(out_pipe.read_to_end(&mut out))? {
out_done = true;
fds[0].fd = err_pipe.as_raw_fd();
errfd = 0;
nfds -= 1;
}
data(true, &mut out, out_done);
}
Ok(())
}
}
#[cfg(windows)]
mod imp {
use std::io;
use std::os::windows::prelude::*;
use std::process::{ChildStderr, ChildStdout};
use std::slice;
use miow::iocp::{CompletionPort, CompletionStatus};
use miow::pipe::NamedPipe;
use miow::Overlapped;
use windows_sys::Win32::Foundation::ERROR_BROKEN_PIPE;
struct Pipe<'a> {
dst: &'a mut Vec<u8>,
overlapped: Overlapped,
pipe: NamedPipe,
done: bool,
}
pub fn read2(
out_pipe: ChildStdout,
err_pipe: ChildStderr,
data: &mut dyn FnMut(bool, &mut Vec<u8>, bool),
) -> io::Result<()> {
let mut out = Vec::new();
let mut err = Vec::new();
let port = CompletionPort::new(1)?;
port.add_handle(0, &out_pipe)?;
port.add_handle(1, &err_pipe)?;
unsafe {
let mut out_pipe = Pipe::new(out_pipe, &mut out);
let mut err_pipe = Pipe::new(err_pipe, &mut err);
out_pipe.read()?;
err_pipe.read()?;
let mut status = [CompletionStatus::zero(), CompletionStatus::zero()];
while !out_pipe.done || !err_pipe.done {
for status in port.get_many(&mut status, None)? {
if status.token() == 0 {
out_pipe.complete(status);
data(true, out_pipe.dst, out_pipe.done);
out_pipe.read()?;
} else {
err_pipe.complete(status);
data(false, err_pipe.dst, err_pipe.done);
err_pipe.read()?;
}
}
}
Ok(())
}
}
impl<'a> Pipe<'a> {
unsafe fn new<P: IntoRawHandle>(p: P, dst: &'a mut Vec<u8>) -> Pipe<'a> {
Pipe {
dst,
pipe: NamedPipe::from_raw_handle(p.into_raw_handle()),
overlapped: Overlapped::zero(),
done: false,
}
}
unsafe fn read(&mut self) -> io::Result<()> {
let dst = slice_to_end(self.dst);
match self.pipe.read_overlapped(dst, self.overlapped.raw()) {
Ok(_) => Ok(()),
Err(e) => {
if e.raw_os_error() == Some(ERROR_BROKEN_PIPE as i32) {
self.done = true;
Ok(())
} else {
Err(e)
}
}
}
}
unsafe fn complete(&mut self, status: &CompletionStatus) {
let prev = self.dst.len();
self.dst.set_len(prev + status.bytes_transferred() as usize);
if status.bytes_transferred() == 0 {
self.done = true;
}
}
}
unsafe fn slice_to_end(v: &mut Vec<u8>) -> &mut [u8] {
if v.capacity() == 0 {
v.reserve(16);
}
if v.capacity() == v.len() {
v.reserve(1);
}
slice::from_raw_parts_mut(v.as_mut_ptr().add(v.len()), v.capacity() - v.len())
}
}
|
