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//
// VT.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2013-2017 Jean-Philippe Bruyère
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Runtime.InteropServices;
namespace Linux.VT {
public enum KDMode : byte {
TEXT = 0x00,
GRAPHICS= 0x01,
TEXT0 = 0x02, /* obsolete */
TEXT1 = 0x03 /* obsolete */
}
public enum SwitchMode : sbyte {
AUTO = 0x00, /* auto vt switching */
PROCESS = 0x01, /* process controls switching */
ACKACQ = 0x02 /* acknowledge switch */
}
public enum KbdMode{
RAW = 0x00,
XLATE = 0x01,
MEDIUMRAW = 0x02,
UNICODE = 0x03,
OFF = 0x04,
}
public struct vt_mode {
public SwitchMode mode; /* vt mode */
public sbyte waitv; /* if set, hang on writes if not active */
public short relsig; /* signal to raise on release req */
public short acqsig; /* signal to raise on acquisition */
public short frsig; /* unused (set to 0) */
}
public struct State {
public ushort v_active; /* active vt */
public ushort v_signal; /* signal to send */
public ushort v_state; /* vt bitmask */
}
public struct Sizes {
public ushort v_rows; /* number of rows */
public ushort v_cols; /* number of columns */
public ushort v_scrollsize; /* number of lines of scrollback */
}
public struct KbEntry {
public byte kb_table;
public byte kb_index;
public ushort kb_value;
}
public class VTControler : IDisposable {
public int fd = -1;
#region ctor
public VTControler (string path = "/dev/tty") {
fd = Libc.open (path, OpenFlags.ReadWrite);
if (fd <= 0)
throw new Exception ("VTControler: unable to open " + path);
}
#endregion
/// <summary>set Graphic or Text mode for VT. </summary>
unsafe public KDMode KDMode {
get {
KDMode m = 0;
if (ioctl (fd, KDGETMODE, ref m) < 0)
throw new Exception ("VTControler: failed to get current TTY mode");
return m;
}
set {
if (ioctl (fd, KDSETMODE, value) < 0)
throw new Exception ("VTControler: failed to set current TTY mode");
}
}
/// <summary>set AUTO or PROCESS mode for VT. </summary>
unsafe public vt_mode VTMode {
get {
vt_mode m = new vt_mode();
if (ioctl (fd, VT_GETMODE, ref m) < 0)
throw new Exception ("VTControler: failed to get VTMode for current");
return m;
}
set {
if (ioctl (fd, VT_SETMODE, ref value) < 0)
throw new Exception ("VTControler: failed to set VTMode for current VT");
}
}
/// <summary>
/// Switchs to V.
/// </summary>
/// <param name="vt">Virtual Terminal to switch to</param>
/// <param name="waitCompleted">If set to <c>true</c> wait until switch is completed.</param>
public void SwitchTo (int vt, bool waitCompleted = true){
if (ioctl (fd, VT_ACTIVATE, vt) < 0)
throw new Exception ("VTControler: failed to activate TTY" + vt);
if (waitCompleted) {
if (ioctl (fd, VT_WAITACTIVE, vt) < 0)
throw new Exception ("VTControler: error waiting for activation of TTY" + vt);
}
}
public State State {
get {
State vtstats = new State ();
if (ioctl (fd, VT_GETSTATE, ref vtstats) < 0)
throw new Exception ("VirtualTerminal: unable to get TTY Stats");
return vtstats;
}
}
public int FirstAvailableVT {
get {
long freeVT = 0;
ioctl (fd, VT_OPENQRY, ref freeVT);
return (int)freeVT;
}
}
public int CurrentVT {
get {
return (int)State.v_active;
}
}
const int ACKACQ = 0x02;
public void AcknoledgeSwitchRequest (){
if (ioctl (fd, VT_RELDISP, ACKACQ)<0)
throw new Exception ("VTControler: failed to acknowledge switch with VT_RELDISP");
}
#region IDisposable implementation
~VTControler(){
Dispose (false);
}
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
protected virtual void Dispose (bool disposing){
if (fd > 0)
Libc.close (fd);
fd = -1;
}
#endregion
#region IOCTLS constants
const uint KDSETMODE = 0x4B3A; /* set text/graphics mode */
const uint KDGETMODE = 0x4B3B; /* get current mode */
const uint KDGKBMODE = 0x4B44; /* gets current keyboard mode */
const uint KDSKBMODE = 0x4B45; /* sets current keyboard mode */
const uint KDGKBENT = 0x4B46; /* gets one entry in translation table */
const uint KDSKBENT = 0x4B47; /* sets one entry in translation table */
const uint VT_OPENQRY = 0x5600; /* find available vt */
const uint VT_GETMODE = 0x5601; /* get mode of active vt */
const uint VT_SETMODE = 0x5602; /* set mode of active vt */
const uint VT_GETSTATE = 0x5603; /* get global vt state info */
const uint VT_SENDSIG = 0x5604; /* signal to send to bitmask of vts */
const uint VT_RELDISP = 0x5605; /* release display */
const uint VT_ACTIVATE = 0x5606; /* make vt active */
const uint VT_WAITACTIVE= 0x5607; /* wait for vt active */
const uint VT_DISALLOCATE= 0x5608; /* free memory associated to vt */
const uint VT_RESIZE = 0x5609; /* set kernel's idea of screensize */
#endregion
#region ioctl overrides
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref KbEntry entry);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref KbdMode value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref long value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, int value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref int value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref State value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref SwitchMode value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, KDMode value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref KDMode value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, vt_mode value);
[DllImport("libc")]
static extern int ioctl(int d, uint request, ref vt_mode value);
#endregion
}
}
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