TUN-3201: Create base cloudflared UI structure

vendor/github.com/gdamore/tcell/tscreen_bsd.go

@@ -0,0 +1,116 @@
+// +build freebsd netbsd openbsd dragonfly
+
+// Copyright 2019 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.
+
+package tcell
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+	"unsafe"
+)
+
+type termiosPrivate syscall.Termios
+
+func (t *tScreen) termioInit() error {
+	var e error
+	var newtios termiosPrivate
+	var fd uintptr
+	var tios uintptr
+	var ioc uintptr
+	t.tiosp = &termiosPrivate{}
+
+	if t.in, e = os.OpenFile("/dev/tty", os.O_RDONLY, 0); e != nil {
+		goto failed
+	}
+	if t.out, e = os.OpenFile("/dev/tty", os.O_WRONLY, 0); e != nil {
+		goto failed
+	}
+
+	tios = uintptr(unsafe.Pointer(t.tiosp))
+	ioc = uintptr(syscall.TIOCGETA)
+	fd = uintptr(t.out.Fd())
+	if _, _, e1 := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0); e1 != 0 {
+		e = e1
+		goto failed
+	}
+
+	newtios = *t.tiosp
+	newtios.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK |
+		syscall.ISTRIP | syscall.INLCR | syscall.IGNCR |
+		syscall.ICRNL | syscall.IXON
+	newtios.Oflag &^= syscall.OPOST
+	newtios.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON |
+		syscall.ISIG | syscall.IEXTEN
+	newtios.Cflag &^= syscall.CSIZE | syscall.PARENB
+	newtios.Cflag |= syscall.CS8
+
+	tios = uintptr(unsafe.Pointer(&newtios))
+
+	ioc = uintptr(syscall.TIOCSETA)
+	if _, _, e1 := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0); e1 != 0 {
+		e = e1
+		goto failed
+	}
+
+	signal.Notify(t.sigwinch, syscall.SIGWINCH)
+
+	if w, h, e := t.getWinSize(); e == nil && w != 0 && h != 0 {
+		t.cells.Resize(w, h)
+	}
+
+	return nil
+
+failed:
+	if t.in != nil {
+		t.in.Close()
+	}
+	if t.out != nil {
+		t.out.Close()
+	}
+	return e
+}
+
+func (t *tScreen) termioFini() {
+
+	signal.Stop(t.sigwinch)
+
+	<-t.indoneq
+
+	if t.out != nil {
+		fd := uintptr(t.out.Fd())
+		ioc := uintptr(syscall.TIOCSETAF)
+		tios := uintptr(unsafe.Pointer(t.tiosp))
+		syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0)
+		t.out.Close()
+	}
+	if t.in != nil {
+		t.in.Close()
+	}
+}
+
+func (t *tScreen) getWinSize() (int, int, error) {
+
+	fd := uintptr(t.out.Fd())
+	dim := [4]uint16{}
+	dimp := uintptr(unsafe.Pointer(&dim))
+	ioc := uintptr(syscall.TIOCGWINSZ)
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL,
+		fd, ioc, dimp, 0, 0, 0); err != 0 {
+		return -1, -1, err
+	}
+	return int(dim[1]), int(dim[0]), nil
+}