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41
42 #include "qwssignalhandler_p.h"
43
44 #ifndef QT_NO_QWS_SIGNALHANDLER
45
46 #include "qlock_p.h"
47 #include "qwslock_p.h"
48
49 #include <sys/types.h>
50 #include <signal.h>
51
52 QT_BEGIN_NAMESPACE
53
54 class QWSSignalHandlerPrivate : public QWSSignalHandler
55 {
56 public:
QWSSignalHandlerPrivate()57 QWSSignalHandlerPrivate() : QWSSignalHandler() {}
58 };
59
60
61 Q_GLOBAL_STATIC(QWSSignalHandlerPrivate, signalHandlerInstance);
62
63
instance()64 QWSSignalHandler* QWSSignalHandler::instance()
65 {
66 return signalHandlerInstance();
67 }
68
QWSSignalHandler()69 QWSSignalHandler::QWSSignalHandler()
70 {
71 const int signums[] = { SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE,
72 SIGSEGV, SIGTERM, SIGBUS };
73 const int n = sizeof(signums)/sizeof(int);
74
75 for (int i = 0; i < n; ++i) {
76 const int signum = signums[i];
77 qt_sighandler_t old = signal(signum, handleSignal);
78 if (old == SIG_IGN) // don't remove shm and semaphores when ignored
79 signal(signum, old);
80 else
81 oldHandlers[signum] = (old == SIG_ERR ? SIG_DFL : old);
82 }
83 }
84
~QWSSignalHandler()85 QWSSignalHandler::~QWSSignalHandler()
86 {
87 clear();
88 }
89
clear()90 void QWSSignalHandler::clear()
91 {
92 #if !defined(QT_NO_QWS_MULTIPROCESS)
93 // it is safe to call d-tors directly here since, on normal exit,
94 // lists should be empty; otherwise, we don't care about semi-alive objects
95 // and the only important thing here is to unregister the system semaphores.
96 while (!locks.isEmpty())
97 locks.takeLast()->~QLock();
98 while (!wslocks.isEmpty())
99 wslocks.takeLast()->~QWSLock();
100 #endif
101 objects.clear();
102 }
103
handleSignal(int signum)104 void QWSSignalHandler::handleSignal(int signum)
105 {
106 QWSSignalHandler *h = instance();
107 if (h) {
108 signal(signum, h->oldHandlers[signum]);
109 h->clear();
110 }
111 raise(signum);
112 }
113
114 QT_END_NAMESPACE
115
116 #endif // QT_NO_QWS_SIGNALHANDLER
117