Qt 4.8
qwssignalhandler.cpp
Go to the documentation of this file.
1 /****************************************************************************
2 **
3 ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/legal
5 **
6 ** This file is part of the QtGui module of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and Digia. For licensing terms and
14 ** conditions see http://qt.digia.com/licensing. For further information
15 ** use the contact form at http://qt.digia.com/contact-us.
16 **
17 ** GNU Lesser General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU Lesser
19 ** General Public License version 2.1 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 2.1 requirements
23 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 **
25 ** In addition, as a special exception, Digia gives you certain additional
26 ** rights. These rights are described in the Digia Qt LGPL Exception
27 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 **
29 ** GNU General Public License Usage
30 ** Alternatively, this file may be used under the terms of the GNU
31 ** General Public License version 3.0 as published by the Free Software
32 ** Foundation and appearing in the file LICENSE.GPL included in the
33 ** packaging of this file. Please review the following information to
34 ** ensure the GNU General Public License version 3.0 requirements will be
35 ** met: http://www.gnu.org/copyleft/gpl.html.
36 **
37 **
38 ** $QT_END_LICENSE$
39 **
40 ****************************************************************************/
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 
53 
55 {
56 public:
58 };
59 
60 
61 Q_GLOBAL_STATIC(QWSSignalHandlerPrivate, signalHandlerInstance);
62 
63 
65 {
66  return signalHandlerInstance();
67 }
68 
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 
86 {
87  clear();
88 }
89 
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())
100 #endif
101  objects.clear();
102 }
103 
105 {
106  QWSSignalHandler *h = instance();
107  if (h) {
108  signal(signum, h->oldHandlers[signum]);
109  h->clear();
110  }
111  raise(signum);
112 }
113 
115 
116 #endif // QT_NO_QWS_SIGNALHANDLER
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
~QWSLock()
Definition: qwslock.cpp:129
QList< QWSLock * > wslocks
bool isEmpty() const
Returns true if the list contains no items; otherwise returns false.
Definition: qlist.h:152
static QWSSignalHandler * instance()
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
QHash< int, qt_sighandler_t > oldHandlers
QList< QLock * > locks
QObjectCleanupHandler objects
Q_GLOBAL_STATIC(QWSSignalHandlerPrivate, signalHandlerInstance)
void(* qt_sighandler_t)(int)
T takeLast()
Removes the last item in the list and returns it.
Definition: qlist.h:492
static void handleSignal(int signal)
~QLock()
Destroys a lock.
Definition: qlock.cpp:221
void clear()
Deletes all objects in this cleanup handler.