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https://github.com/gdamore/tcell.git
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8fa68ef023
This is not so much a fix, as a workaround for an incredibly busted tty driver in macOS. I've tried nearly every other approach I can think of, and this is the best of a bunch of really rotten options. The draw back here is that reinitializing the screen may not work as well as we'd like, and that there may be a leaked descriptor and goroutine after you Fini() on macOS. Not many other approaches seem viable, and to be honest, very few applications are likely to ever notice that. If some Apple developer sees this, please talk to me about the fixes needed in the tty driver -- this has been a known bug (to me at least) for many years now.
141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
// +build darwin
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// Copyright 2018 The TCell Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use file except in compliance with the License.
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// You may obtain a copy of the license at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcell
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// The Darwin system is *almost* a real BSD system, but it suffers from
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// a brain damaged TTY driver. This TTY driver does not actually
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// wake up in poll() or similar calls, which means that we cannot reliably
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// shut down the terminal without resorting to obscene custom C code
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// and a dedicated poller thread.
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//
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// So instead, we do a best effort, and simply try to do the close in the
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// background. Probably this will cause a leak of two goroutines and
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// maybe also the file descriptor, meaning that applications on Darwin
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// can't reinitialize the screen, but that's probably a very rare behavior,
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// and accepting that is the best of some very poor alternative options.
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//
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// Maybe someday Apple will fix there tty driver, but its been broken for
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// a long time (probably forever) so holding one's breath is contraindicated.
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import (
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"os"
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"os/signal"
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"syscall"
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"unsafe"
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)
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type termiosPrivate syscall.Termios
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func (t *tScreen) termioInit() error {
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var e error
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var newtios termiosPrivate
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var fd uintptr
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var tios uintptr
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var ioc uintptr
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t.tiosp = &termiosPrivate{}
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if t.in, e = os.OpenFile("/dev/tty", os.O_RDONLY, 0); e != nil {
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goto failed
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}
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if t.out, e = os.OpenFile("/dev/tty", os.O_WRONLY, 0); e != nil {
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goto failed
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}
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tios = uintptr(unsafe.Pointer(t.tiosp))
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ioc = uintptr(syscall.TIOCGETA)
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fd = uintptr(t.out.Fd())
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if _, _, e1 := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0); e1 != 0 {
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e = e1
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goto failed
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}
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// On this platform (FreeBSD and family), the baud rate is stored
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// directly as an integer in termios.c_ospeed. No bitmasking required.
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t.baud = int(t.tiosp.Ospeed)
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newtios = *t.tiosp
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newtios.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK |
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syscall.ISTRIP | syscall.INLCR | syscall.IGNCR |
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syscall.ICRNL | syscall.IXON
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newtios.Oflag &^= syscall.OPOST
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newtios.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON |
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syscall.ISIG | syscall.IEXTEN
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newtios.Cflag &^= syscall.CSIZE | syscall.PARENB
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newtios.Cflag |= syscall.CS8
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tios = uintptr(unsafe.Pointer(&newtios))
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ioc = uintptr(syscall.TIOCSETA)
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if _, _, e1 := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0); e1 != 0 {
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e = e1
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goto failed
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}
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signal.Notify(t.sigwinch, syscall.SIGWINCH)
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if w, h, e := t.getWinSize(); e == nil && w != 0 && h != 0 {
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t.cells.Resize(w, h)
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}
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return nil
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failed:
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if t.in != nil {
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t.in.Close()
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}
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if t.out != nil {
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t.out.Close()
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}
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return e
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}
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func (t *tScreen) termioFini() {
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signal.Stop(t.sigwinch)
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<-t.indoneq
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if t.out != nil {
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fd := uintptr(t.out.Fd())
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ioc := uintptr(syscall.TIOCSETAF)
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tios := uintptr(unsafe.Pointer(t.tiosp))
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syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0)
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t.out.Close()
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}
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// See above -- we background this call which might help, but
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// really the tty is probably open.
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go func() {
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if t.in != nil {
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t.in.Close()
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}
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}()
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}
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func (t *tScreen) getWinSize() (int, int, error) {
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fd := uintptr(t.out.Fd())
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dim := [4]uint16{}
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dimp := uintptr(unsafe.Pointer(&dim))
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ioc := uintptr(syscall.TIOCGWINSZ)
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if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL,
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fd, ioc, dimp, 0, 0, 0); err != 0 {
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return -1, -1, err
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}
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return int(dim[1]), int(dim[0]), nil
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}
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