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improve fidelity of tcsetattr interface

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This commit is contained in:
Wez Furlong 2018-07-21 11:18:24 -07:00
parent dfaf61ff6a
commit db787fdfd0
1 changed files with 22 additions and 6 deletions
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28
src/terminal/unix.rs
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@ -5,7 +5,8 @@ use std::io::{stdin, stdout, Error as IOError, ErrorKind, Read, Result as IOResu
use std::mem;
use std::os::unix::io::{AsRawFd, RawFd};
use termios::{
cfmakeraw, tcdrain, tcflush, tcsetattr, Termios, TCIFLUSH, TCIOFLUSH, TCOFLUSH, TCSANOW,
cfmakeraw, tcdrain, tcflush, tcsetattr, Termios, TCIFLUSH, TCIOFLUSH, TCOFLUSH, TCSADRAIN,
TCSAFLUSH, TCSANOW,
};
use terminal::{cast, ScreenSize, Terminal, BUF_SIZE};
@ -26,11 +27,21 @@ pub enum Purge {
InputAndOutputQueue,
}
pub enum SetAttributeWhen {
/// changes are applied immediately
Now,
/// Apply once the current output queue has drained
AfterDrainOutputQueue,
/// Wait for the current output queue to drain, then
/// discard any unread input
AfterDrainOutputQueuePurgeInputQueue,
}
pub trait UnixTty {
fn get_size(&mut self) -> Result<winsize, Error>;
fn set_size(&mut self, size: winsize) -> Result<(), Error>;
fn get_termios(&mut self) -> Result<Termios, Error>;
fn set_termios(&mut self, termios: &Termios) -> Result<(), Error>;
fn set_termios(&mut self, termios: &Termios, when: SetAttributeWhen) -> Result<(), Error>;
/// Waits until all written data has been transmitted.
fn drain(&mut self) -> Result<(), Error>;
fn purge(&mut self, purge: Purge) -> Result<(), Error>;
@ -107,8 +118,13 @@ impl UnixTty for TtyHandle {
Termios::from_fd(self.fd).map_err(|e| format_err!("get_termios failed: {}", e))
}
fn set_termios(&mut self, termios: &Termios) -> Result<(), Error> {
tcsetattr(self.fd, TCSANOW, termios).map_err(|e| format_err!("set_termios failed: {}", e))
fn set_termios(&mut self, termios: &Termios, when: SetAttributeWhen) -> Result<(), Error> {
let when = match when {
SetAttributeWhen::Now => TCSANOW,
SetAttributeWhen::AfterDrainOutputQueue => TCSADRAIN,
SetAttributeWhen::AfterDrainOutputQueuePurgeInputQueue => TCSAFLUSH,
};
tcsetattr(self.fd, when, termios).map_err(|e| format_err!("set_termios failed: {}", e))
}
fn drain(&mut self) -> Result<(), Error> {
@ -209,7 +225,7 @@ impl Terminal for UnixTerminal {
let mut raw = self.write.get_termios()?;
cfmakeraw(&mut raw);
self.write
.set_termios(&raw)
.set_termios(&raw, SetAttributeWhen::AfterDrainOutputQueuePurgeInputQueue)
.map_err(|e| format_err!("failed to set raw mode: {}", e))
}
@ -238,7 +254,7 @@ impl Terminal for UnixTerminal {
impl Drop for UnixTerminal {
fn drop(&mut self) {
self.write
.set_termios(&self.saved_termios)
.set_termios(&self.saved_termios, SetAttributeWhen::Now)
.expect("failed to restore original termios state");
}
}