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    40 ****************************************************************************/

    41 

    42 #include "qwssignalhandler_p.h"

    43 

    44 #ifndef QT_NO_QWS_SIGNALHANDLER

    45 

    46 #include <sys/types.h>

    47 #ifndef QT_NO_QWS_MULTIPROCESS

    48 #  include <sys/ipc.h>

    49 #  include <sys/sem.h>

    50 #endif

    51 #include <signal.h>

    52 

    53 QT_BEGIN_NAMESPACE

    54 

    55 #ifndef Q_OS_BSD4

    56 union semun {

    57     int val;

    58     struct semid_ds *buf;

    59     unsigned short *array;

    60     struct seminfo  *__buf;

    61 };

    62 #endif

    63 

    64 

    65 class QWSSignalHandlerPrivate : public QWSSignalHandler

    66 {

    67 public:

    68     QWSSignalHandlerPrivate() : QWSSignalHandler() {}

    69 };

    70 

    71 

    72 Q_GLOBAL_STATIC(QWSSignalHandlerPrivate, signalHandlerInstance);

    73 

    74 

    75 QWSSignalHandler* QWSSignalHandler::instance()

    76 {

    77     return signalHandlerInstance();

    78 }

    79 

    80 QWSSignalHandler::QWSSignalHandler()

    81 {

    82     const int signums[] = { SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE,

    83                             SIGSEGV, SIGTERM, SIGBUS };

    84     const int n = sizeof(signums)/sizeof(int);

    85 

    86     for (int i = 0; i < n; ++i) {

    87         const int signum = signums[i];

    88         qt_sighandler_t old = signal(signum, handleSignal);

    89         if (old == SIG_IGN) // don't remove shm and semaphores when ignored

    90             signal(signum, old);

    91         else

    92             oldHandlers[signum] = (old == SIG_ERR ? SIG_DFL : old);

    93     }

    94 }

    95 

    96 QWSSignalHandler::~QWSSignalHandler()

    97 {

    98 #ifndef QT_NO_QWS_MULTIPROCESS

    99     while (!semaphores.isEmpty())

   100         removeSemaphore(semaphores.last());

   101 #endif

   102 }

   103 

   104 #ifndef QT_NO_QWS_MULTIPROCESS

   105 void QWSSignalHandler::removeSemaphore(int semno)

   106 {

   107     const int index = semaphores.lastIndexOf(semno);

   108     if (index != -1) {

   109         semun semval;

   110         semval.val = 0;

   111         semctl(semaphores.at(index), 0, IPC_RMID, semval);

   112         semaphores.remove(index);

   113     }

   114 }

   115 #endif // QT_NO_QWS_MULTIPROCESS

   116 

   117 void QWSSignalHandler::handleSignal(int signum)

   118 {

   119     QWSSignalHandler *h = instance();

   120 

   121     signal(signum, h->oldHandlers[signum]);

   122 

   123 #ifndef QT_NO_QWS_MULTIPROCESS

   124     semun semval;

   125     semval.val = 0;

   126     for (int i = 0; i < h->semaphores.size(); ++i)

   127         semctl(h->semaphores.at(i), 0, IPC_RMID, semval);

   128 #endif

   129 

   130     h->objects.clear();

   131     raise(signum);

   132 }

   133 

   134 QT_END_NAMESPACE

   135 

   136 #endif // QT_QWS_NO_SIGNALHANDLER