public TtyContext(ITrace trace, int fd, bool echo)
{
EnsureArgument.NotNull(trace, nameof(trace));
EnsureArgument.PositiveOrZero(fd, nameof(fd));
_trace = trace;
_fd = fd;
int error = 0;
// Capture current terminal settings so we can restore them later
if ((error = Termios.tcgetattr(_fd, out termios t)) != 0)
{
throw new InteropException("Failed to get initial terminal settings", error);
}
_originalTerm = t;
// Set desired echo state
_trace.WriteLine($"Setting terminal echo state to '{echo}'");
t.c_lflag &= echo
? LocalFlags.ECHO
: ~LocalFlags.ECHO;
if ((error = Termios.tcsetattr(_fd, SetActionFlags.TCSAFLUSH, ref t)) != 0)
{
throw new InteropException("Failed to set terminal settings", error);
}
}
/// <inheritdoc/>
public override Task <IPtyConnection> StartTerminalAsync(PtyOptions options, TraceSource trace, CancellationToken cancellationToken)
{
var winSize = new WinSize((ushort)options.Rows, (ushort)options.Cols);
string?[] terminalArgs = GetExecvpArgs(options);
var controlCharacters = new Dictionary <TermSpecialControlCharacter, sbyte>
{
{ TermSpecialControlCharacter.VEOF, 4 },
{ TermSpecialControlCharacter.VEOL, -1 },
{ TermSpecialControlCharacter.VEOL2, -1 },
{ TermSpecialControlCharacter.VERASE, 0x7f },
{ TermSpecialControlCharacter.VWERASE, 23 },
{ TermSpecialControlCharacter.VKILL, 21 },
{ TermSpecialControlCharacter.VREPRINT, 18 },
{ TermSpecialControlCharacter.VINTR, 3 },
{ TermSpecialControlCharacter.VQUIT, 0x1c },
{ TermSpecialControlCharacter.VSUSP, 26 },
{ TermSpecialControlCharacter.VSTART, 17 },
{ TermSpecialControlCharacter.VSTOP, 19 },
{ TermSpecialControlCharacter.VLNEXT, 22 },
{ TermSpecialControlCharacter.VDISCARD, 15 },
{ TermSpecialControlCharacter.VMIN, 1 },
{ TermSpecialControlCharacter.VTIME, 0 },
{ TermSpecialControlCharacter.VDSUSP, 25 },
{ TermSpecialControlCharacter.VSTATUS, 20 },
};
var term = new Termios(
inputFlag: TermInputFlag.ICRNL | TermInputFlag.IXON | TermInputFlag.IXANY | TermInputFlag.IMAXBEL | TermInputFlag.BRKINT | TermInputFlag.IUTF8,
outputFlag: TermOuptutFlag.OPOST | TermOuptutFlag.ONLCR,
controlFlag: TermConrolFlag.CREAD | TermConrolFlag.CS8 | TermConrolFlag.HUPCL,
localFlag: TermLocalFlag.ICANON | TermLocalFlag.ISIG | TermLocalFlag.IEXTEN | TermLocalFlag.ECHO | TermLocalFlag.ECHOE | TermLocalFlag.ECHOK | TermLocalFlag.ECHOKE | TermLocalFlag.ECHOCTL,
speed: TermSpeed.B38400,
controlCharacters: controlCharacters);
int controller = 0;
int pid = forkpty(ref controller, null, ref term, ref winSize);
if (pid == -1)
{
throw new InvalidOperationException($"forkpty(4) failed with error {Marshal.GetLastWin32Error()}");
}
if (pid == 0)
{
// We are in a forked process! See http://man7.org/linux/man-pages/man2/fork.2.html for details.
// Only our thread is running. We inherited open file descriptors and get a copy of the parent process memory.
Environment.CurrentDirectory = options.Cwd;
execvpe(options.App, terminalArgs, options.Environment);
// Unreachable code after execvpe()
}
// We have forked the terminal
return(Task.FromResult <IPtyConnection>(new PtyConnection(controller, pid)));
}
public void Dispose()
{
if (_isDisposed)
{
return;
}
int error = 0;
// Restore original terminal settings
if ((error = Termios.tcsetattr(_fd, SetActionFlags.TCSAFLUSH, ref _originalTerm)) != 0)
{
_trace.WriteLine($"Failed to get restore terminal settings (error: {error:x}");
}
_isDisposed = true;
}
internal static extern int forkpty(ref int master, StringBuilder?name, ref Termios termp, ref WinSize winsize);
internal static extern int cfsetospeed(ref Termios termios, IntPtr speed);
public static void BlitIntPtrToTermios(IntPtr intPtr, ref Termios termios)
{
unsafe {
termios = ((Termios *)intPtr.ToPointer())[0];
}
}
public static void BlitTermiosToIntPtr(Termios termios, IntPtr intPtr)
{
unsafe {
((Termios *)intPtr.ToPointer())[0] = termios;
}
}
