Dogcows Code - chaz/openbox/blob - util/epist/epist.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; -*-
   2 // epist.cc for Epistory - a key handler for NETWM/EWMH window managers.
   3 // Copyright (c) 2002 - 2002 Ben Jansens <ben at orodu.net>
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining a
   6 // copy of this software and associated documentation files (the "Software"),
   7 // to deal in the Software without restriction, including without limitation
   8 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9 // and/or sell copies of the Software, and to permit persons to whom the
  10 // Software is furnished to do so, subject to the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be included in
  13 // all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21 // DEALINGS IN THE SOFTWARE.
  22
  23 #ifdef    HAVE_CONFIG_H
  24 #  include "../../config.h"
  25 #endif // HAVE_CONFIG_H
  26
  27 extern "C" {
  28 #ifdef    HAVE_UNISTD_H
  29 #  include <sys/types.h>
  30 #  include <unistd.h>
  31 #endif // HAVE_UNISTD_H
  32
  33 #ifdef    HAVE_STDLIB_H
  34 #  include <stdlib.h>
  35 #endif // HAVE_STDLIB_H
  36
  37 #ifdef    HAVE_SIGNAL_H
  38 #  include <signal.h>
  39 #endif // HAVE_SIGNAL_H
  40
  41 #ifdef    HAVE_LIBGEN_H
  42 #  include <libgen.h>
  43 #endif // HAVE_LIBGEN_H
  44 }
  45
  46 #include <iostream>
  47 #include <string>
  48
  49 using std::cout;
  50 using std::endl;
  51 using std::string;
  52
  53 #include "epist.hh"
  54 #include "process.hh"
  55 #include "../../src/XAtom.hh"
  56
  57 bool _shutdown = false;
  58 char **_argv;
  59 char *_display_name = 0;
  60 Display *_display = 0;
  61 Window _root = None;
  62 XAtom *_xatom;
  63
  64
  65 #ifdef   HAVE_SIGACTION
  66 static void signalhandler(int sig)
  67 #else //  HAVE_SIGACTION
  68 static RETSIGTYPE signalhandler(int sig)
  69 #endif // HAVE_SIGACTION
  70 {
  71   switch (sig) {
  72   case SIGSEGV:
  73     cout << "epist: Segmentation fault. Aborting and dumping core.\n";
  74     abort();
  75   case SIGHUP:
  76     cout << "epist: Restarting on request.\n";
  77     execvp(_argv[0], _argv);
  78     execvp(basename(_argv[0]), _argv);
  79   }
  80   _shutdown = true;
  81
  82 #ifndef   HAVE_SIGACTION
  83   // assume broken, braindead sysv signal semantics
  84   signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
  85 #endif // HAVE_SIGACTION
  86 }
  87
  88
  89 void parseCommandLine(int argc, char **argv) {
  90   _argv = argv;
  91
  92   for (int i = 1; i < argc; ++i) {
  93     if (string(argv[i]) == "-display") {
  94       if (++i >= argc) {
  95         cout << "error:: '-display' requires an argument\n";
  96         exit(1);
  97       }
  98       _display_name = argv[i];
  99
 100       string dtmp = (string)"DISPLAY=" + _display_name;
 101       if (putenv(const_cast<char*>(dtmp.c_str()))) {
 102         cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 103         perror("putenv()");
 104       }
 105     }
 106   }
 107 }
 108
 109
 110 bool findSupportingWM() {
 111   Window support_win;
 112   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
 113                          support_win) || support_win == None)
 114     return false;
 115
 116   string title;
 117   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
 118   cout << "Found compatible window manager: " << title << endl;
 119   return true;
 120 }
 121
 122
 123 int main(int argc, char **argv) {
 124 #ifdef    HAVE_SIGACTION
 125   struct sigaction action;
 126
 127   action.sa_handler = signalhandler;
 128   action.sa_mask = sigset_t();
 129   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 130
 131   sigaction(SIGPIPE, &action, NULL);
 132   sigaction(SIGSEGV, &action, NULL);
 133   sigaction(SIGFPE, &action, NULL);
 134   sigaction(SIGTERM, &action, NULL);
 135   sigaction(SIGINT, &action, NULL);
 136   sigaction(SIGHUP, &action, NULL);
 137 #else // !HAVE_SIGACTION
 138   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 139   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 140   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 141   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 142   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 143   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 144 #endif // HAVE_SIGACTION
 145
 146   parseCommandLine(argc, argv);
 147
 148   _display = XOpenDisplay(_display_name);
 149   if (! _display) {
 150     cout << "Connection to X server '" << _display_name << "' failed.\n";
 151     return 1;
 152   }
 153   _root = RootWindow(_display, DefaultScreen(_display));
 154   _xatom = new XAtom(_display);
 155
 156   XSelectInput(_display, _root, PropertyChangeMask);
 157
 158   // find a window manager supporting NETWM, waiting for it to load if we must
 159   while (! (_shutdown || findSupportingWM()));
 160
 161   if (! _shutdown) {
 162     updateClientList();
 163     updateActiveWindow();
 164   }
 165
 166   while (! _shutdown) {
 167     if (XPending(_display)) {
 168       XEvent e;
 169       XNextEvent(_display, &e);
 170       processEvent(e);
 171     } else {
 172       usleep(300);
 173     }
 174   }
 175
 176   delete _xatom;
 177   XCloseDisplay(_display);
 178   return 0;
 179 }