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serial: Set terminal in raw mode

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In order to have proper output from the serial, we need to setup the
terminal in raw mode. When the VM is shutting down, it is also the
VMM responsibility to set the terminal back into canonical mode if we
don't want to get any weird behavior from the shell.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-05-07 11:34:03 -07:00 committed by Samuel Ortiz
parent 112418d928
commit 5c9fc816de
1 changed files with 16 additions and 2 deletions
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18
vmm/src/vm.rs
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@ -117,6 +117,12 @@ pub enum Error {
/// Write to the serial console failed.
Serial(vmm_sys_util::Error),
/// Cannot setup terminal in raw mode.
SetTerminalRaw(vmm_sys_util::Error),
/// Cannot setup terminal in canonical mode.
SetTerminalCanon(vmm_sys_util::Error),
/// Cannot allocate IRQ.
AllocateIrq,
@ -541,6 +547,10 @@ impl<'a> Vm<'a> {
let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
let epoll_fd = self.epoll.as_raw_fd();
let stdin = io::stdin();
let stdin_lock = stdin.lock();
stdin_lock.set_raw_mode().map_err(Error::SetTerminalRaw)?;
loop {
let num_events =
epoll::wait(epoll_fd, -1, &mut events[..]).map_err(Error::EpollError)?;
@ -554,15 +564,19 @@ impl<'a> Vm<'a> {
// Consume the event.
self.devices.exit_evt.read().map_err(Error::EventFd)?;
// Don't forget to set the terminal in canonical mode
// before to exit.
stdin_lock
.set_canon_mode()
.map_err(Error::SetTerminalCanon)?;
// Safe because we're terminating the process anyway.
unsafe {
libc::_exit(0);
}
}
EpollDispatch::Stdin => {
let stdin = io::stdin();
let mut out = [0u8; 64];
let stdin_lock = stdin.lock();
let count = stdin_lock.read_raw(&mut out).map_err(Error::Serial)?;
self.devices