Add qt_safe_poll

This function is introduced to safely provide poll(2)-like semantics for
socket multiplexing on Unix-like platforms. For platforms where no poll
system call is available, an implementation based on select(2) is provided.

Change-Id: I320e97dae5924316675a74d1897c48cae292ac6d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

6 files changed, 152 insertions, 0 deletions

diff --git a/config.tests/unix/poll/poll.cpp b/config.tests/unix/poll/poll.cpp
new file mode 100644
index 0000000000..06ae0386b5
--- /dev/null
+++ b/config.tests/unix/poll/poll.cpp
@@ -0,0 +1,45 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <poll.h>
+
+int main()
+{
+    struct pollfd pfd;
+
+    pfd.fd = -1;
+    pfd.events = 0;
+    pfd.revents = 0;
+
+    return ::poll(&pfd, 1, 0);
+}
diff --git a/config.tests/unix/poll/poll.pro b/config.tests/unix/poll/poll.pro
new file mode 100644
index 0000000000..70121b4586
--- /dev/null
+++ b/config.tests/unix/poll/poll.pro
@@ -0,0 +1,2 @@
+SOURCES = poll.cpp
+CONFIG -= qt
diff --git a/config.tests/unix/pollts/pollts.cpp b/config.tests/unix/pollts/pollts.cpp
new file mode 100644
index 0000000000..c2d1940ee0
--- /dev/null
+++ b/config.tests/unix/pollts/pollts.cpp
@@ -0,0 +1,51 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <poll.h>
+#include <signal.h>
+#include <time.h>
+
+int main()
+{
+    struct pollfd pfd;
+    struct timespec ts;
+
+    pfd.fd = -1;
+    pfd.events = 0;
+    pfd.revents = 0;
+
+    ts.tv_sec = 0;
+    ts.tv_nsec = 0;
+
+    return ::pollts(&pfd, 1, &ts, nullptr);
+}
diff --git a/config.tests/unix/pollts/pollts.pro b/config.tests/unix/pollts/pollts.pro
new file mode 100644
index 0000000000..5109dc33fd
--- /dev/null
+++ b/config.tests/unix/pollts/pollts.pro
@@ -0,0 +1,2 @@
+SOURCES = pollts.cpp
+CONFIG -= qt
diff --git a/config.tests/unix/ppoll/ppoll.cpp b/config.tests/unix/ppoll/ppoll.cpp
new file mode 100644
index 0000000000..19d680edcf
--- /dev/null
+++ b/config.tests/unix/ppoll/ppoll.cpp
@@ -0,0 +1,50 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <signal.h>
+#include <poll.h>
+
+int main()
+{
+    struct pollfd pfd;
+    struct timespec ts;
+
+    pfd.fd = -1;
+    pfd.events = 0;
+    pfd.revents = 0;
+
+    ts.tv_sec = 0;
+    ts.tv_nsec = 0;
+
+    return ::ppoll(&pfd, 1, &ts, nullptr);
+}
diff --git a/config.tests/unix/ppoll/ppoll.pro b/config.tests/unix/ppoll/ppoll.pro
new file mode 100644
index 0000000000..d08a8a0679
--- /dev/null
+++ b/config.tests/unix/ppoll/ppoll.pro
@@ -0,0 +1,2 @@
+SOURCES = ppoll.cpp
+CONFIG -= qt