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Merge pull request #46 from najohnsn/master
Add support for z/OS
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Original file line number | Diff line number | Diff line change |
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// +build zos | ||
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/* | ||
Copyright The containerd Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this 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. | ||
*/ | ||
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package console | ||
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import ( | ||
"fmt" | ||
"os" | ||
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"golang.org/x/sys/unix" | ||
) | ||
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// NewPty creates a new pty pair | ||
// The master is returned as the first console and a string | ||
// with the path to the pty slave is returned as the second | ||
func NewPty() (Console, string, error) { | ||
var f File | ||
var err error | ||
var slave string | ||
for i := 0;; i++ { | ||
ptyp := fmt.Sprintf("/dev/ptyp%04d", i) | ||
f, err = os.OpenFile(ptyp, os.O_RDWR, 0600) | ||
if err == nil { | ||
slave = fmt.Sprintf("/dev/ttyp%04d", i) | ||
break | ||
} | ||
if os.IsNotExist(err) { | ||
return nil, "", err | ||
} | ||
// else probably Resource Busy | ||
} | ||
m, err := newMaster(f) | ||
if err != nil { | ||
return nil, "", err | ||
} | ||
return m, slave, nil | ||
} | ||
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type master struct { | ||
f File | ||
original *unix.Termios | ||
} | ||
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func (m *master) Read(b []byte) (int, error) { | ||
return m.f.Read(b) | ||
} | ||
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func (m *master) Write(b []byte) (int, error) { | ||
return m.f.Write(b) | ||
} | ||
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func (m *master) Close() error { | ||
return m.f.Close() | ||
} | ||
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func (m *master) Resize(ws WinSize) error { | ||
return tcswinsz(m.f.Fd(), ws) | ||
} | ||
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func (m *master) ResizeFrom(c Console) error { | ||
ws, err := c.Size() | ||
if err != nil { | ||
return err | ||
} | ||
return m.Resize(ws) | ||
} | ||
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func (m *master) Reset() error { | ||
if m.original == nil { | ||
return nil | ||
} | ||
return tcset(m.f.Fd(), m.original) | ||
} | ||
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func (m *master) getCurrent() (unix.Termios, error) { | ||
var termios unix.Termios | ||
if err := tcget(m.f.Fd(), &termios); err != nil { | ||
return unix.Termios{}, err | ||
} | ||
return termios, nil | ||
} | ||
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func (m *master) SetRaw() error { | ||
rawState, err := m.getCurrent() | ||
if err != nil { | ||
return err | ||
} | ||
rawState = cfmakeraw(rawState) | ||
rawState.Oflag = rawState.Oflag | unix.OPOST | ||
return tcset(m.f.Fd(), &rawState) | ||
} | ||
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func (m *master) DisableEcho() error { | ||
rawState, err := m.getCurrent() | ||
if err != nil { | ||
return err | ||
} | ||
rawState.Lflag = rawState.Lflag &^ unix.ECHO | ||
return tcset(m.f.Fd(), &rawState) | ||
} | ||
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func (m *master) Size() (WinSize, error) { | ||
return tcgwinsz(m.f.Fd()) | ||
} | ||
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func (m *master) Fd() uintptr { | ||
return m.f.Fd() | ||
} | ||
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func (m *master) Name() string { | ||
return m.f.Name() | ||
} | ||
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// checkConsole checks if the provided file is a console | ||
func checkConsole(f File) error { | ||
var termios unix.Termios | ||
if tcget(f.Fd(), &termios) != nil { | ||
return ErrNotAConsole | ||
} | ||
return nil | ||
} | ||
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func newMaster(f File) (Console, error) { | ||
m := &master{ | ||
f: f, | ||
} | ||
t, err := m.getCurrent() | ||
if err != nil { | ||
return nil, err | ||
} | ||
m.original = &t | ||
return m, nil | ||
} | ||
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// ClearONLCR sets the necessary tty_ioctl(4)s to ensure that a pty pair | ||
// created by us acts normally. In particular, a not-very-well-known default of | ||
// Linux unix98 ptys is that they have +onlcr by default. While this isn't a | ||
// problem for terminal emulators, because we relay data from the terminal we | ||
// also relay that funky line discipline. | ||
func ClearONLCR(fd uintptr) error { | ||
return setONLCR(fd, false) | ||
} | ||
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// SetONLCR sets the necessary tty_ioctl(4)s to ensure that a pty pair | ||
// created by us acts as intended for a terminal emulator. | ||
func SetONLCR(fd uintptr) error { | ||
return setONLCR(fd, true) | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,26 @@ | ||
/* | ||
Copyright The containerd Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this 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. | ||
*/ | ||
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package console | ||
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import ( | ||
"golang.org/x/sys/unix" | ||
) | ||
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const ( | ||
cmdTcGet = unix.TCGETS | ||
cmdTcSet = unix.TCSETS | ||
) |