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UnixTerminalReader.cs
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UnixTerminalReader.cs
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using static System.Unix.UnixPInvoke;
namespace System.Terminals.Unix;
sealed class UnixTerminalReader : NativeTerminalReader<UnixVirtualTerminal, int>
{
readonly object _lock;
readonly UnixCancellationPipe _cancellationPipe;
public UnixTerminalReader(
UnixVirtualTerminal terminal,
string name,
int handle,
UnixCancellationPipe cancellationPipe,
object @lock)
: base(terminal, name, handle)
{
_lock = @lock;
_cancellationPipe = cancellationPipe;
}
protected override unsafe int ReadPartialCore(Span<byte> buffer, CancellationToken cancellationToken)
{
using var guard = Terminal.Control.Guard();
// If the descriptor is invalid, just present the illusion to the user that it has been redirected to /dev/null
// or something along those lines, i.e. return EOF.
if (buffer.IsEmpty || !IsValid)
return 0;
cancellationToken.ThrowIfCancellationRequested();
lock (_lock)
{
_cancellationPipe.PollWithCancellation(Handle, cancellationToken);
fixed (byte* p = &MemoryMarshal.GetReference(buffer))
{
nint ret;
// Note that this call may get us suspended by way of a SIGTTIN signal if we are a background process
// and the handle refers to a terminal.
while ((ret = read(Handle, p, (nuint)buffer.Length)) == -1 &&
Marshal.GetLastPInvokeError() == EINTR)
{
// Retry in case we get interrupted by a signal.
}
if (ret != -1)
return (int)ret;
var err = Marshal.GetLastPInvokeError();
// EPIPE means the descriptor was probably redirected to a program that ended.
return err == EPIPE ?
0 : throw new TerminalException($"Could not read from {Name}: {new Win32Exception(err).Message}");
}
}
}
}