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

   1 // -*- mode: C++; indent-tabs-mode: nil; -*-
   2 // main.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 #include <X11/Xlib.h>
  29
  30 #ifdef    HAVE_UNISTD_H
  31 #  include <sys/types.h>
  32 #  include <unistd.h>
  33 #endif // HAVE_UNISTD_H
  34
  35 #ifdef    HAVE_SIGNAL_H
  36 #  include <signal.h>
  37 #endif // HAVE_SIGNAL_H
  38
  39 #ifdef    HAVE_SYS_SIGNAL_H
  40 #  include <sys/signal.h>
  41 #endif // HAVE_SYS_SIGNAL_H
  42
  43 #ifdef    HAVE_LIBGEN_H
  44 #  include <libgen.h>
  45 #endif // HAVE_LIBGEN_H
  46 }
  47
  48 #include <iostream>
  49
  50 using std::cout;
  51 using std::endl;
  52
  53 bool _shutdown = false;
  54 char **_argv;
  55 char *_display_name = 0;
  56 Display *_display = 0;
  57
  58 #ifdef   HAVE_SIGACTION
  59 static void signalhandler(int sig)
  60 #else //  HAVE_SIGACTION
  61 static RETSIGTYPE signalhandler(int sig)
  62 #endif // HAVE_SIGACTION
  63 {
  64   switch (sig) {
  65   case SIGSEGV:
  66     cout << "Segmentation fault. Aborting and dumping core.\n";
  67     abort();
  68   case SIGHUP:
  69     cout << "Restarting on request.\n";
  70     execvp(_argv[0], _argv);
  71     execvp(basename(_argv[0]), _argv);
  72   }
  73   _shutdown = true;
  74
  75 #ifndef   HAVE_SIGACTION
  76   // assume broken, braindead sysv signal semantics
  77   signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
  78 #endif // HAVE_SIGACTION
  79 }
  80
  81
  82 int main(int, char **argv) {
  83   _argv = argv;
  84
  85 #ifdef    HAVE_SIGACTION
  86   struct sigaction action;
  87
  88   action.sa_handler = signalhandler;
  89   action.sa_mask = sigset_t();
  90   action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;
  91
  92   sigaction(SIGPIPE, &action, NULL);
  93   sigaction(SIGSEGV, &action, NULL);
  94   sigaction(SIGFPE, &action, NULL);
  95   sigaction(SIGTERM, &action, NULL);
  96   sigaction(SIGINT, &action, NULL);
  97   sigaction(SIGHUP, &action, NULL);
  98 #else // !HAVE_SIGACTION
  99   signal(SIGPIPE, (RETSIGTYPE (*)(int)) signalhandler);
 100   signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
 101   signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
 102   signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
 103   signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
 104   signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
 105 #endif // HAVE_SIGACTION
 106
 107   _display = XOpenDisplay(_display_name);
 108   if (! _display) {
 109     cout << "Connection to X server '" << _display_name << "' failed.\n";
 110     return 1;
 111   }
 112
 113   while (! _shutdown) {
 114     usleep(500);
 115   }
 116
 117   XCloseDisplay(_display);
 118   return 0;
 119 }