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_STDIO_H
  34 #  include <stdio.h>
  35 #endif // HAVE_STDIO_H
  36
  37 #ifdef    HAVE_STDLIB_H
  38 #  include <stdlib.h>
  39 #endif // HAVE_STDLIB_H
  40
  41 #ifdef    HAVE_SIGNAL_H
  42 #  include <signal.h>
  43 #endif // HAVE_SIGNAL_H
  44
  45 #ifdef    HAVE_LIBGEN_H
  46 #  include <libgen.h>
  47 #endif // HAVE_LIBGEN_H
  48 }
  49
  50 #include <iostream>
  51 #include <string>
  52
  53 using std::cout;
  54 using std::endl;
  55 using std::string;
  56
  57 #include "epist.hh"
  58 #include "process.hh"
  59 #include "../../src/XAtom.hh"
  60
  61 bool _shutdown = false;
  62 char **_argv;
  63 char *_display_name = 0;
  64 Display *_display = 0;
  65 Window _root = None;
  66 XAtom *_xatom;
  67
  68
  69 #ifdef   HAVE_SIGACTION
  70 static void signalhandler(int sig)
  71 #else //  HAVE_SIGACTION
  72 static RETSIGTYPE signalhandler(int sig)
  73 #endif // HAVE_SIGACTION
  74 {
  75   switch (sig) {
  76   case SIGSEGV:
  77     cout << "epist: Segmentation fault. Aborting and dumping core.\n";
  78     abort();
  79   case SIGHUP:
  80     cout << "epist: Restarting on request.\n";
  81     execvp(_argv[0], _argv);
  82     execvp(basename(_argv[0]), _argv);
  83   }
  84   _shutdown = true;
  85
  86 #ifndef   HAVE_SIGACTION
  87   // assume broken, braindead sysv signal semantics
  88   signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
  89 #endif // HAVE_SIGACTION
  90 }
  91
  92
  93 void parseCommandLine(int argc, char **argv) {
  94   _argv = argv;
  95
  96   for (int i = 1; i < argc; ++i) {
  97     if (string(argv[i]) == "-display") {
  98       if (++i >= argc) {
  99         cout << "error:: '-display' requires an argument\n";
 100         exit(1);
 101       }
 102       _display_name = argv[i];
 103
 104       string dtmp = (string)"DISPLAY=" + _display_name;
 105       if (putenv(const_cast<char*>(dtmp.c_str()))) {
 106         cout << "warning: couldn't set environment variable 'DISPLAY'\n";
 107         perror("putenv()");
 108       }
 109     }
 110   }
 111 }
 112
 113
 114 bool findSupportingWM() {
 115   Window support_win;
 116   if (! _xatom->getValue(_root, XAtom::net_supporting_wm_check, XAtom::window,
 117                          support_win) || support_win == None)
 118     return false;
 119
 120   string title;
 121   _xatom->getValue(support_win, XAtom::net_wm_name, XAtom::utf8, title);
 122   cout << "Found compatible window manager: " << title << endl;
 123   return true;
 124 }
 125
 126
 127 int main(int argc, char **argv) {
 128 #ifdef    HAVE_SIGACTION
 129   struct sigaction action;
 130
 131   action.sa_handler = signalhandler;
 132   action.sa_mask = sigset_t();
 133   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
 134
 135   sigaction(SIGPIPE, &action, NULL);
 136   sigaction(SIGSEGV, &action, NULL);
 137   sigaction(SIGFPE, &action, NULL);
 138   sigaction(SIGTERM, &action, NULL);
 139   sigaction(SIGINT, &action, NULL);
 140   sigaction(SIGHUP, &action, NULL);
 141 #else // !HAVE_SIGACTION
 142   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 143   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 144   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 145   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 146   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 147   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 148 #endif // HAVE_SIGACTION
 149
 150   parseCommandLine(argc, argv);
 151
 152   _display = XOpenDisplay(_display_name);
 153   if (! _display) {
 154     cout << "Connection to X server '" << _display_name << "' failed.\n";
 155     return 1;
 156   }
 157   _root = RootWindow(_display, DefaultScreen(_display));
 158   _xatom = new XAtom(_display);
 159
 160   XSelectInput(_display, _root, PropertyChangeMask);
 161
 162   // find a window manager supporting NETWM, waiting for it to load if we must
 163   while (! (_shutdown || findSupportingWM()));
 164
 165   if (! _shutdown) {
 166     updateClientList();
 167     updateActiveWindow();
 168   }
 169
 170   while (! _shutdown) {
 171     if (XPending(_display)) {
 172       XEvent e;
 173       XNextEvent(_display, &e);
 174       processEvent(e);
 175     } else {
 176       usleep(300);
 177     }
 178   }
 179
 180   XSelectInput(_display, _root, None);
 181   delete _xatom;
 182   XCloseDisplay(_display);
 183   return 0;
 184 }