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// Copyright 2005-2017 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include "mumble_pch.hpp"
#include "SharedMemory.h"
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <QDebug>
struct SharedMemory2Private {
int iShmemFD;
};
SharedMemory2::SharedMemory2(QObject *p, unsigned int minsize, const QString &memname) : QObject(p) {
a_ucData = NULL;
d = new SharedMemory2Private();
d->iShmemFD = -1;
int prot = PROT_READ;
if (memname.isEmpty()) {
prot |= PROT_WRITE;
for (int i=0;i<100;++i) {
qsName = QString::fromLatin1("/MumbleOverlayMemory%1").arg(++uiIndex);
d->iShmemFD=shm_open(qsName.toUtf8().constData(), O_RDWR|O_CREAT|O_EXCL, 0600);
if (d->iShmemFD != -1) {
if (ftruncate(d->iShmemFD, minsize) == 0) {
break;
} else {
close(d->iShmemFD);
d->iShmemFD = -1;
shm_unlink(qsName.toUtf8().constData());
}
}
}
} else {
qsName = memname;
d->iShmemFD=shm_open(qsName.toUtf8().constData(), O_RDONLY, 0600);
}
if (d->iShmemFD == -1) {
qWarning() << "SharedMemory2: Failed to open shared memory segment" << qsName;
return;
}
struct stat buf;
fstat(d->iShmemFD, &buf);
unsigned int memsize = static_cast<unsigned int>(buf.st_size);
if (memsize < minsize) {
qWarning() << "SharedMemory2: Segment too small" << memsize << minsize;
} else if (memsize > std::numeric_limits<unsigned int>::max()) {
qWarning() << "SharedMemory2: Segment too big" << memsize;
} else {
a_ucData = reinterpret_cast<unsigned char *>(mmap(NULL, minsize, prot, MAP_SHARED, d->iShmemFD, 0));
if (a_ucData != reinterpret_cast<unsigned char *>(-1)) {
uiSize = memsize;
return;
}
qWarning() << "SharedMemory2: Failed to map shared memory segment" << qsName;
a_ucData = NULL;
}
close(d->iShmemFD);
d->iShmemFD = -1;
shm_unlink(qsName.toUtf8().constData());
}
SharedMemory2::~SharedMemory2() {
systemRelease();
if (a_ucData) {
munmap(a_ucData, uiSize);
a_ucData = NULL;
}
}
void SharedMemory2::systemRelease() {
if (d->iShmemFD != -1) {
close(d->iShmemFD);
d->iShmemFD = -1;
shm_unlink(qsName.toUtf8().constData());
}
}
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