libgm2/libm2cor/KeyBoardLEDs.cc

   1 /* KeyBoardLEDs.c provide access to the keyboard LEDs.
   2
   3 Copyright (C) 2005-2022 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #include <config.h>
  28 #include <m2rts.h>
  29
  30 #define EXPORT(FUNC) m2cor ## _KeyBoardLEDs_ ## FUNC
  31 #define M2EXPORT(FUNC) m2cor ## _M2_KeyBoardLEDs_ ## FUNC
  32 #define M2LIBNAME "m2cor"
  33
  34 #if defined(linux)
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <fcntl.h>
  39 #include <linux/kd.h>
  40 #include <sys/ioctl.h>
  41 #include <stdio.h>
  42
  43 #if !defined(TRUE)
  44 #   define TRUE (1==1)
  45 #endif
  46 #if !defined(FALSE)
  47 #   define FALSE (1==0)
  48 #endif
  49
  50 #include <stdlib.h>
  51
  52 static int fd;
  53 static int initialized = FALSE;
  54
  55
  56 extern "C" void
  57 EXPORT(SwitchScroll) (int scrolllock)
  58 {
  59   unsigned char leds;
  60   int r = ioctl (fd, KDGETLED, &leds);
  61   if (scrolllock)
  62     leds = leds | LED_SCR;
  63   else
  64     leds = leds & (~ LED_SCR);
  65   r = ioctl (fd, KDSETLED, leds);
  66 }
  67
  68 extern "C" void
  69 EXPORT(SwitchNum) (int numlock)
  70 {
  71   unsigned char leds;
  72   int r = ioctl (fd, KDGETLED, &leds);
  73   if (numlock)
  74     leds = leds | LED_NUM;
  75   else
  76     leds = leds & (~ LED_NUM);
  77   r = ioctl (fd, KDSETLED, leds);
  78 }
  79
  80 extern "C" void
  81 EXPORT(SwitchCaps) (int capslock)
  82 {
  83   unsigned char leds;
  84   int r = ioctl (fd, KDGETLED, &leds);
  85   if (capslock)
  86     leds = leds | LED_CAP;
  87   else
  88     leds = leds & (~ LED_CAP);
  89   r = ioctl (fd, KDSETLED, leds);
  90 }
  91
  92 extern "C" void
  93 EXPORT(SwitchLeds) (int numlock, int capslock, int scrolllock)
  94 {
  95   EXPORT(SwitchScroll) (scrolllock);
  96   EXPORT(SwitchNum) (numlock);
  97   EXPORT(SwitchCaps) (capslock);
  98 }
  99
 100 extern "C" void
 101 M2EXPORT(init) (int, char **, char **)
 102 {
 103   if (! initialized)
 104     {
 105       initialized = TRUE;
 106       fd = open ("/dev/tty", O_RDONLY);
 107       if (fd == -1)
 108         {
 109           perror ("unable to open /dev/tty");
 110           exit (1);
 111         }
 112     }
 113 }
 114
 115 #else
 116 extern "C" void
 117 EXPORT(SwitchLeds) (int numlock, int capslock, int scrolllock)
 118 {
 119 }
 120
 121 extern "C" void
 122 EXPORT(SwitchScroll) (int scrolllock)
 123 {
 124 }
 125
 126 extern "C" void
 127 EXPORT(SwitchNum) (int numlock)
 128 {
 129 }
 130
 131 extern "C" void
 132 EXPORT(SwitchCaps) (int capslock)
 133 {
 134 }
 135
 136 extern "C" void
 137 M2EXPORT(init) (int, char **, char **)
 138 {
 139 }
 140 #endif
 141
 142 /* GNU Modula-2 linking hooks.  */
 143
 144 extern "C" void
 145 M2EXPORT(fini) (int, char **, char **)
 146 {
 147 }
 148
 149 extern "C" void
 150 M2EXPORT(dep) (void)
 151 {
 152 }
 153
 154 extern "C" void __attribute__((__constructor__))
 155 M2EXPORT(ctor) (void)
 156 {
 157   m2pim_M2RTS_RegisterModule ("KeyBoardLEDs", M2LIBNAME,
 158                               M2EXPORT(init), M2EXPORT(fini),
 159                               M2EXPORT(dep));
 160 }