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16556370d7
fixes #194 Starting multiple screen sessions (lost key event) You can test this by using the mouse demo, which now supports pressing CTRL-Z. This does not actually suspend the demo, but starts a subshell which takes over. After the subshell is exited, the demo takes control of the screen back. This can be done multiple times, and it is possible to start multiple "nested" iterations of the demo this way.
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
// Copyright 2021 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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// +build linux aix zos solaris
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package tcell
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import (
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"os"
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"syscall"
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"golang.org/x/sys/unix"
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)
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// NB: We might someday wish to move Windows to this model. However,
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// that would probably mean sacrificing some of the richer key reporting
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// that we can obtain with the console API present on Windows.
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// nonBlocking changes VMIN to 0, and VTIME to 1. This basically ensures that
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// we can wake up the input loop. We only want to do this if we are going to interrupt
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// that loop. Normally we use VMIN 1 and VTIME 0, which ensures we pick up bytes when
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// they come but don't spin burning cycles.
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func (t *tScreen) nonBlocking(on bool) {
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fd := int(os.Stdin.Fd())
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tio, err := unix.IoctlGetTermios(fd, unix.TCGETS)
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if err != nil {
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return
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}
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if on {
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tio.Cc[unix.VMIN] = 0
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tio.Cc[unix.VTIME] = 0
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} else {
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// block for any output
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tio.Cc[unix.VTIME] = 0
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tio.Cc[unix.VMIN] = 1
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}
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_ = syscall.SetNonblock(fd, on)
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// We want to set this *right now*.
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_ = unix.IoctlSetTermios(fd, unix.TCSETS, tio)
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}
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