mirror of https://github.com/gdamore/tcell.git
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
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// 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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