qsystemsemaphore_systemv.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2015 The Qt Company Ltd.-
4** Contact: http://www.qt.io/licensing/-
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6** This file is part of the QtCore module of the Qt Toolkit.-
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28** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.-
29**-
30** $QT_END_LICENSE$-
31**-
32****************************************************************************/-
33-
34#include "qsystemsemaphore.h"-
35#include "qsystemsemaphore_p.h"-
36-
37#include <qdebug.h>-
38#include <qfile.h>-
39#include <qcoreapplication.h>-
40-
41#ifndef QT_POSIX_IPC-
42-
43#ifndef QT_NO_SYSTEMSEMAPHORE-
44-
45#include <sys/types.h>-
46#include <sys/ipc.h>-
47#include <sys/sem.h>-
48#include <fcntl.h>-
49#include <errno.h>-
50-
51#include "private/qcore_unix_p.h"-
52-
53// OpenBSD 4.2 doesn't define EIDRM, see BUGS section:-
54// http://www.openbsd.org/cgi-bin/man.cgi?query=semop&manpath=OpenBSD+4.2-
55#if defined(Q_OS_OPENBSD) && !defined(EIDRM)-
56#define EIDRM EINVAL-
57#endif-
58-
59QT_BEGIN_NAMESPACE-
60-
61/*!-
62 \internal-
63-
64 Setup unix_key-
65 */-
66key_t QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode mode)-
67{-
68 if (key.isEmpty()){
key.isEmpty()Description
TRUEevaluated 59 times by 1 test
Evaluated by:
  • tst_QSharedMemory
FALSEevaluated 22452 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
59-22452
69 errorString = QCoreApplication::tr("%1: key is empty", "QSystemSemaphore").arg(QLatin1String("QSystemSemaphore::handle:"));-
70 error = QSystemSemaphore::KeyError;-
71 return -1;
executed 59 times by 1 test: return -1;
Executed by:
  • tst_QSharedMemory
59
72 }-
73-
74 // ftok requires that an actual file exists somewhere-
75 if (-1 != unix_key)
-1 != unix_keyDescription
TRUEevaluated 15320 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
FALSEevaluated 7132 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
7132-15320
76 return unix_key;
executed 15320 times by 4 tests: return unix_key;
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
15320
77-
78 // Create the file needed for ftok-
79 int built = QSharedMemoryPrivate::createUnixKeyFile(fileName);-
80 if (-1 == built) {
-1 == builtDescription
TRUEnever evaluated
FALSEevaluated 7132 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
0-7132
81 errorString = QCoreApplication::tr("%1: unable to make key", "QSystemSemaphore").arg(QLatin1String("QSystemSemaphore::handle:"));-
82 error = QSystemSemaphore::KeyError;-
83 return -1;
never executed: return -1;
0
84 }-
85 createdFile = (1 == built);-
86-
87 // Get the unix key for the created file-
88 unix_key = qt_safe_ftok(QFile::encodeName(fileName), 'Q');-
89 if (-1 == unix_key) {
-1 == unix_keyDescription
TRUEnever evaluated
FALSEevaluated 7132 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
0-7132
90 errorString = QCoreApplication::tr("%1: ftok failed", "QSystemSemaphore").arg(QLatin1String("QSystemSemaphore::handle:"));-
91 error = QSystemSemaphore::KeyError;-
92 return -1;
never executed: return -1;
0
93 }-
94-
95 // Get semaphore-
96 semaphore = semget(unix_key, 1, 0600 | IPC_CREAT | IPC_EXCL);-
97 if (-1 == semaphore) {
-1 == semaphoreDescription
TRUEevaluated 3613 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
FALSEevaluated 3519 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
3519-3613
98 if (errno == EEXIST)
(*__errno_location ()) == 17Description
TRUEevaluated 3611 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
FALSEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
2-3611
99 semaphore = semget(unix_key, 1, 0600 | IPC_CREAT);
executed 3611 times by 3 tests: semaphore = semget(unix_key, 1, 0600 | 01000);
Executed by:
  • tst_QSharedMemory
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
3611
100 if (-1 == semaphore) {
-1 == semaphoreDescription
TRUEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
FALSEevaluated 3611 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
2-3611
101 setErrorString(QLatin1String("QSystemSemaphore::handle"));-
102 cleanHandle();-
103 return -1;
executed 2 times by 1 test: return -1;
Executed by:
  • tst_QSharedMemory
2
104 }-
105 } else {
executed 3611 times by 3 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
3611
106 createdSemaphore = true;-
107 // Force cleanup of file, it is possible that it can be left over from a crash-
108 createdFile = true;-
109 }
executed 3519 times by 3 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
3519
110-
111 if (mode == QSystemSemaphore::Create) {
mode == QSyste...aphore::CreateDescription
TRUEevaluated 3513 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
FALSEevaluated 3617 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
3513-3617
112 createdSemaphore = true;-
113 createdFile = true;-
114 }
executed 3513 times by 3 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
3513
115-
116 // Created semaphore so initialize its value.-
117 if (createdSemaphore && initialValue >= 0) {
createdSemaphoreDescription
TRUEevaluated 6987 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
FALSEevaluated 143 times by 2 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_qsystemsemaphore - unknown status
initialValue >= 0Description
TRUEevaluated 6987 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
FALSEnever evaluated
0-6987
118 qt_semun init_op;-
119 init_op.val = initialValue;-
120 if (-1 == semctl(semaphore, 0, SETVAL, init_op)) {
-1 == semctl(s..., 16, init_op)Description
TRUEnever evaluated
FALSEevaluated 6987 times by 3 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
0-6987
121 setErrorString(QLatin1String("QSystemSemaphore::handle"));-
122 cleanHandle();-
123 return -1;
never executed: return -1;
0
124 }-
125 }
executed 6987 times by 3 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
6987
126-
127 return unix_key;
executed 7130 times by 4 tests: return unix_key;
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
7130
128}-
129-
130/*!-
131 \internal-
132-
133 Cleanup the unix_key-
134 */-
135void QSystemSemaphorePrivate::cleanHandle()-
136{-
137 unix_key = -1;-
138-
139 // remove the file if we made it-
140 if (createdFile) {
createdFileDescription
TRUEevaluated 3522 times by 2 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
FALSEevaluated 3937 times by 5 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qapplication - unknown status
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
3522-3937
141 QFile::remove(fileName);-
142 createdFile = false;-
143 }
executed 3522 times by 2 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
3522
144-
145 if (createdSemaphore) {
createdSemaphoreDescription
TRUEevaluated 3520 times by 2 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
FALSEevaluated 3939 times by 5 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qapplication - unknown status
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
3520-3939
146 if (-1 != semaphore) {
-1 != semaphoreDescription
TRUEevaluated 3519 times by 2 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
FALSEevaluated 1 time by 1 test
Evaluated by:
  • tst_QSharedMemory
1-3519
147 if (-1 == semctl(semaphore, 0, IPC_RMID, 0)) {
-1 == semctl(s...hore, 0, 0, 0)Description
TRUEnever evaluated
FALSEevaluated 3519 times by 2 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
0-3519
148 setErrorString(QLatin1String("QSystemSemaphore::cleanHandle"));-
149#if defined QSYSTEMSEMAPHORE_DEBUG-
150 qDebug() << QLatin1String("QSystemSemaphore::cleanHandle semctl failed.");-
151#endif-
152 }
never executed: end of block
0
153 semaphore = -1;-
154 }
executed 3519 times by 2 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
3519
155 createdSemaphore = false;-
156 }
executed 3520 times by 2 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
3520
157}
executed 7459 times by 5 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qapplication - unknown status
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
7459
158-
159/*!-
160 \internal-
161 */-
162bool QSystemSemaphorePrivate::modifySemaphore(int count)-
163{-
164 if (-1 == handle())
-1 == handle()Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
FALSEevaluated 15320 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
2-15320
165 return false;
executed 2 times by 1 test: return false;
Executed by:
  • tst_QSharedMemory
2
166-
167 struct sembuf operation;-
168 operation.sem_num = 0;-
169 operation.sem_op = count;-
170 operation.sem_flg = SEM_UNDO;-
171-
172 int res;-
173 EINTR_LOOP(res, semop(semaphore, &operation, 1));
executed 15320 times by 4 tests: end of block
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
res == -1Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
FALSEevaluated 15318 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
(*__errno_location ()) == 4Description
TRUEnever evaluated
FALSEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
0-15320
174 if (-1 == res) {
-1 == resDescription
TRUEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
FALSEevaluated 15318 times by 4 tests
Evaluated by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
2-15318
175 // If the semaphore was removed be nice and create it and then modifySemaphore again-
176 if (errno == EINVAL || errno == EIDRM) {
(*__errno_location ()) == 22Description
TRUEevaluated 2 times by 1 test
Evaluated by:
  • tst_QSharedMemory
FALSEnever evaluated
(*__errno_location ()) == 43Description
TRUEnever evaluated
FALSEnever evaluated
0-2
177 semaphore = -1;-
178 cleanHandle();-
179 handle();-
180 return modifySemaphore(count);
executed 2 times by 1 test: return modifySemaphore(count);
Executed by:
  • tst_QSharedMemory
2
181 }-
182 setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore"));-
183#if defined QSYSTEMSEMAPHORE_DEBUG-
184 qDebug() << QLatin1String("QSystemSemaphore::modify failed") << count << semctl(semaphore, 0, GETVAL) << errno << EIDRM << EINVAL;-
185#endif-
186 return false;
never executed: return false;
0
187 }-
188-
189 clearError();-
190 return true;
executed 15318 times by 4 tests: return true;
Executed by:
  • tst_QSharedMemory
  • tst_QSystemSemaphore
  • tst_qsharedmemory - unknown status
  • tst_qsystemsemaphore - unknown status
15318
191}-
192-
193-
194QT_END_NAMESPACE-
195-
196#endif // QT_NO_SYSTEMSEMAPHORE-
197-
198#endif // QT_POSIX_IPC-
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