Implement TIOCSCTTY ioctl as a noop.

PiperOrigin-RevId: 215658757
Change-Id: If63b33293f3e53a7f607ae72daa79e2b7ef6fcfd

pkg/abi/linux/ioctl.go

@@ -22,6 +22,7 @@ const (
 	TCSETS     = 0x00005402
 	TCSETSW    = 0x00005403
 	TCSETSF    = 0x00005404
+	TIOCSCTTY  = 0x0000540e
 	TIOCGPGRP  = 0x0000540f
 	TIOCSPGRP  = 0x00005410
 	TIOCOUTQ   = 0x00005411

pkg/sentry/fs/tty/slave.go

@@ -154,6 +154,12 @@ func (sf *slaveFileOperations) Ioctl(ctx context.Context, io usermem.IO, args ar
 		return 0, sf.si.t.ld.windowSize(ctx, io, args)
 	case linux.TIOCSWINSZ:
 		return 0, sf.si.t.ld.setWindowSize(ctx, io, args)
+	case linux.TIOCSCTTY:
+		// Make the given terminal the controlling terminal of the
+		// calling process.
+		// TODO: Implement once we have support for job
+		// control.
+		return 0, nil
 	default:
 		return 0, syserror.ENOTTY
 	}