bump gocui

vendor/github.com/gdamore/tcell/v2/nonblock_unix.go

@@ -0,0 +1,52 @@
+// Copyright 2021 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build linux aix zos solaris
+
+package tcell
+
+import (
+	"os"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+// NB: We might someday wish to move Windows to this model.   However,
+// that would probably mean sacrificing some of the richer key reporting
+// that we can obtain with the console API present on Windows.
+
+// nonBlocking changes VMIN to 0, and VTIME to 1.  This basically ensures that
+// we can wake up the input loop.  We only want to do this if we are going to interrupt
+// that loop.  Normally we use VMIN 1 and VTIME 0, which ensures we pick up bytes when
+// they come but don't spin burning cycles.
+func (t *tScreen) nonBlocking(on bool) {
+	fd := int(os.Stdin.Fd())
+	tio, err := unix.IoctlGetTermios(fd, unix.TCGETS)
+	if err != nil {
+		return
+	}
+	if on {
+		tio.Cc[unix.VMIN] = 0
+		tio.Cc[unix.VTIME] = 0
+	} else {
+		// block for any output
+		tio.Cc[unix.VTIME] = 0
+		tio.Cc[unix.VMIN] = 1
+	}
+
+	_ = syscall.SetNonblock(fd, on)
+	// We want to set this *right now*.
+	_ = unix.IoctlSetTermios(fd, unix.TCSETS, tio)
+}