nuts/sighandler.cpp

   1 //
   2 // C++ Implementation: sighandler
   3 //
   4 // Description:
   5 //
   6 //
   7 // Author: Stefan Bühler <stbuehler@web.de>, (C) 2007
   8 //
   9 // Copyright: See COPYING file that comes with this distribution
  10 //
  11 //
  12
  13 #include "sighandler.h"
  14
  15 extern "C" {
  16 // pipe
  17 #include <unistd.h>
  18 // signal
  19 #include <signal.h>
  20 // fcntl
  21 #include <fcntl.h>
  22 };
  23
  24 #include <iostream>
  25
  26 #include <QSocketNotifier>
  27 #include <QCoreApplication>
  28
  29 namespace nuts {
  30         static int pipefd[2];
  31
  32         static void sig2pipe(int sig) {
  33                 write(pipefd[1], (char*) &sig, sizeof(sig));
  34         }
  35
  36         SigHandler::SigHandler(bool quitOnSignal)
  37         : quitOnSignal(quitOnSignal) {
  38                 if (pipefd[1] != 0) return;
  39                 if (pipe(pipefd) != 0) return;
  40                 fcntl(pipefd[0], F_SETFD, FD_CLOEXEC);
  41                 fcntl(pipefd[1], F_SETFD, FD_CLOEXEC);
  42
  43                 signal(SIGTERM, sig2pipe);
  44                 signal(SIGINT, sig2pipe);
  45
  46                 QSocketNotifier *r = new QSocketNotifier(pipefd[0], QSocketNotifier::Read, this);
  47                 connect(r, SIGNAL(activated(int)), this, SLOT(pipe_rcv()));
  48         }
  49
  50         SigHandler::~SigHandler() {
  51                 close(pipefd[0]);
  52                 close(pipefd[1]);
  53                 pipefd[0] = pipefd[1] = 0;
  54         }
  55         void SigHandler::pipe_rcv() {
  56                 int signum = 0;
  57                 if (read(pipefd[0], &signum, sizeof(signum))) {
  58                         std::cout << "Received signal: " << signum << std::endl;
  59                         emit gotSignal(signum);
  60                         switch (signum) {
  61                                 case SIGTERM:
  62                                 case SIGINT:
  63                                         if (quitOnSignal) {
  64                                                 emit appQuit();
  65                                                 QCoreApplication::quit();
  66                                         }
  67                         }
  68                 }
  69         }
  70
  71 };