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Support new edge-triggered model

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This commit is contained in:
jD91mZM2
2018-05-31 19:18:59 +02:00
parent 07e3c7e320
commit e37ebb22f0
1 changed files with 14 additions and 4 deletions
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src/bin/getty.rs
+14 -4
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@@ -45,14 +45,24 @@ pub fn handle(event_file: &mut File, tty_fd: RawFd, master_fd: RawFd, process: &
let handle_event = |event_id: usize| {
if event_id == tty_fd {
let mut packet = [0; 4096];
let count = syscall::read(tty_fd, &mut packet).expect("getty: failed to read from TTY");
if count != 0 {
loop {
let count = match syscall::read(tty_fd, &mut packet) {
Ok(0) => break,
Ok(count) => count,
Err(ref err) if err.errno == syscall::EAGAIN => break,
Err(_) => panic!("getty: failed to read from TTY")
};
syscall::write(master_fd, &packet[..count]).expect("getty: failed to write master PTY");
}
} else if event_id == master_fd {
let mut packet = [0; 4096];
let count = syscall::read(master_fd, &mut packet).expect("getty: failed to read master PTY");
if count != 0 {
loop {
let count = match syscall::read(master_fd, &mut packet) {
Ok(0) => break,
Ok(count) => count,
Err(ref err) if err.errno == syscall::EAGAIN => break,
Err(_) => panic!("getty: failed to read from master TTY")
};
syscall::write(tty_fd, &packet[1..count]).expect("getty: failed to write to TTY");
if packet[0] & 1 == 1 {
let _ = syscall::fsync(tty_fd);