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extern crate nix;
use self::nix::unistd;
use error::Error as CtrlcError;
use std::os::unix::io::RawFd;
static mut PIPE: (RawFd, RawFd) = (-1, -1);
pub type Error = nix::Error;
pub type Signal = nix::sys::signal::Signal;
extern "C" fn os_handler(_: nix::libc::c_int) {
unsafe {
let _ = unistd::write(PIPE.1, &[0u8]);
}
}
#[inline]
pub unsafe fn init_os_handler() -> Result<(), Error> {
use self::nix::fcntl;
use self::nix::sys::signal;
PIPE = unistd::pipe2(fcntl::OFlag::O_CLOEXEC)?;
let close_pipe = |e: nix::Error| -> Error {
let _ = unistd::close(PIPE.1);
let _ = unistd::close(PIPE.0);
e
};
if let Err(e) = fcntl::fcntl(PIPE.1, fcntl::FcntlArg::F_SETFL(fcntl::OFlag::O_NONBLOCK)) {
return Err(close_pipe(e));
}
let handler = signal::SigHandler::Handler(os_handler);
let new_action = signal::SigAction::new(
handler,
signal::SaFlags::SA_RESTART,
signal::SigSet::empty(),
);
let _old = match signal::sigaction(signal::Signal::SIGINT, &new_action) {
Ok(old) => old,
Err(e) => return Err(close_pipe(e)),
};
#[cfg(feature = "termination")]
match signal::sigaction(signal::Signal::SIGTERM, &new_action) {
Ok(_) => {}
Err(e) => {
signal::sigaction(signal::Signal::SIGINT, &_old).unwrap();
return Err(close_pipe(e));
}
}
Ok(())
}
#[inline]
pub unsafe fn block_ctrl_c() -> Result<(), CtrlcError> {
use std::io;
let mut buf = [0u8];
loop {
match unistd::read(PIPE.0, &mut buf[..]) {
Ok(1) => break,
Ok(_) => return Err(CtrlcError::System(io::ErrorKind::UnexpectedEof.into())),
Err(nix::Error::Sys(nix::errno::Errno::EINTR)) => {}
Err(e) => return Err(e.into()),
}
}
Ok(())
}