diff options
Diffstat (limited to 'vendor/github.com/gdamore/tcell/v2/nonblock_unix.go')
-rw-r--r-- | vendor/github.com/gdamore/tcell/v2/nonblock_unix.go | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/vendor/github.com/gdamore/tcell/v2/nonblock_unix.go b/vendor/github.com/gdamore/tcell/v2/nonblock_unix.go new file mode 100644 index 000000000..c4c374cc9 --- /dev/null +++ b/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) +} |