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qt5base-lts/tests/auto/other/qprocess_and_guieventloop/write-read-write/main.cpp

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QProcess: Handle spurious socket notifications for stdout and stderr On Unix systems where the GUI event dispatcher uses a notification system for socket notifiers that is out of band compared to select(), it's possible for the QSocketNotifier to activate after the pipe has been read from. When that happened, the ioctl(2) call with FIONREAD might return 0 bytes available, which we interpreted to mean EOF. Instead of doing that, always try to read at least one byte and examine the returned byte count from read(2). If it returns 0, that's a real EOF; if it returns -1 EWOULDBLOCK, we simply ignore the situation. That's the case on OS X: the Cocoa event dispatcher uses CFSocket to get notifications and those use kevent (and, apparently, an auxiliary thread) instead of an in-thread select() or poll(). That means the event loop would activate the QSocketNotifier even though there is nothing to be read. Task-number: QTBUG-39488 Change-Id: I1a58b5b1db7a47034fb36a78a005ebff96290efb Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2014-06-05 23:44:07 +00:00
/****************************************************************************
**
Update the Intel copyright year Not that we require it, but since The Qt Company did it for all files they have copyright, even if they haven't touched the file in years (especially not in 2016), I'm doing the same. Change-Id: I7a9e11d7b64a4cc78e24ffff142b4c9d53039846 Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
2016-01-21 01:24:57 +00:00
** Copyright (C) 2016 Intel Corporation.
Updated license headers From Qt 5.7 -> tools & applications are lisenced under GPL v3 with some exceptions, see http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/ Updated license headers to use new GPL-EXCEPT header instead of LGPL21 one (in those files which will be under GPL 3 with exceptions) Change-Id: I42a473ddc97101492a60b9287d90979d9eb35ae1 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
2016-01-15 12:36:27 +00:00
** Contact: https://www.qt.io/licensing/
QProcess: Handle spurious socket notifications for stdout and stderr On Unix systems where the GUI event dispatcher uses a notification system for socket notifiers that is out of band compared to select(), it's possible for the QSocketNotifier to activate after the pipe has been read from. When that happened, the ioctl(2) call with FIONREAD might return 0 bytes available, which we interpreted to mean EOF. Instead of doing that, always try to read at least one byte and examine the returned byte count from read(2). If it returns 0, that's a real EOF; if it returns -1 EWOULDBLOCK, we simply ignore the situation. That's the case on OS X: the Cocoa event dispatcher uses CFSocket to get notifications and those use kevent (and, apparently, an auxiliary thread) instead of an in-thread select() or poll(). That means the event loop would activate the QSocketNotifier even though there is nothing to be read. Task-number: QTBUG-39488 Change-Id: I1a58b5b1db7a47034fb36a78a005ebff96290efb Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2014-06-05 23:44:07 +00:00
**
** This file is part of the test suite of the Qt Toolkit.
**
Updated license headers From Qt 5.7 -> tools & applications are lisenced under GPL v3 with some exceptions, see http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/ Updated license headers to use new GPL-EXCEPT header instead of LGPL21 one (in those files which will be under GPL 3 with exceptions) Change-Id: I42a473ddc97101492a60b9287d90979d9eb35ae1 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
2016-01-15 12:36:27 +00:00
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
QProcess: Handle spurious socket notifications for stdout and stderr On Unix systems where the GUI event dispatcher uses a notification system for socket notifiers that is out of band compared to select(), it's possible for the QSocketNotifier to activate after the pipe has been read from. When that happened, the ioctl(2) call with FIONREAD might return 0 bytes available, which we interpreted to mean EOF. Instead of doing that, always try to read at least one byte and examine the returned byte count from read(2). If it returns 0, that's a real EOF; if it returns -1 EWOULDBLOCK, we simply ignore the situation. That's the case on OS X: the Cocoa event dispatcher uses CFSocket to get notifications and those use kevent (and, apparently, an auxiliary thread) instead of an in-thread select() or poll(). That means the event loop would activate the QSocketNotifier even though there is nothing to be read. Task-number: QTBUG-39488 Change-Id: I1a58b5b1db7a47034fb36a78a005ebff96290efb Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2014-06-05 23:44:07 +00:00
** 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
Update copyright headers Qt copyrights are now in The Qt Company, so we could update the source code headers accordingly. In the same go we should also fix the links to point to qt.io. Outdated header.LGPL removed (use header.LGPL21 instead) Old header.LGPL3 renamed to header.LGPL3-COMM to match actual licensing combination. New header.LGPL-COMM taken in the use file which were using old header.LGPL3 (src/plugins/platforms/android/extract.cpp) Added new header.LGPL3 containing Commercial + LGPLv3 + GPLv2 license combination Change-Id: I6f49b819a8a20cc4f88b794a8f6726d975e8ffbe Reviewed-by: Matti Paaso <matti.paaso@theqtcompany.com>
2015-01-28 08:44:43 +00:00
** a written agreement between you and The Qt Company. For licensing terms
Updated license headers From Qt 5.7 -> tools & applications are lisenced under GPL v3 with some exceptions, see http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/ Updated license headers to use new GPL-EXCEPT header instead of LGPL21 one (in those files which will be under GPL 3 with exceptions) Change-Id: I42a473ddc97101492a60b9287d90979d9eb35ae1 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
2016-01-15 12:36:27 +00:00
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
QProcess: Handle spurious socket notifications for stdout and stderr On Unix systems where the GUI event dispatcher uses a notification system for socket notifiers that is out of band compared to select(), it's possible for the QSocketNotifier to activate after the pipe has been read from. When that happened, the ioctl(2) call with FIONREAD might return 0 bytes available, which we interpreted to mean EOF. Instead of doing that, always try to read at least one byte and examine the returned byte count from read(2). If it returns 0, that's a real EOF; if it returns -1 EWOULDBLOCK, we simply ignore the situation. That's the case on OS X: the Cocoa event dispatcher uses CFSocket to get notifications and those use kevent (and, apparently, an auxiliary thread) instead of an in-thread select() or poll(). That means the event loop would activate the QSocketNotifier even though there is nothing to be read. Task-number: QTBUG-39488 Change-Id: I1a58b5b1db7a47034fb36a78a005ebff96290efb Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2014-06-05 23:44:07 +00:00
**
Updated license headers From Qt 5.7 -> tools & applications are lisenced under GPL v3 with some exceptions, see http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/ Updated license headers to use new GPL-EXCEPT header instead of LGPL21 one (in those files which will be under GPL 3 with exceptions) Change-Id: I42a473ddc97101492a60b9287d90979d9eb35ae1 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
2016-01-15 12:36:27 +00:00
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
QProcess: Handle spurious socket notifications for stdout and stderr On Unix systems where the GUI event dispatcher uses a notification system for socket notifiers that is out of band compared to select(), it's possible for the QSocketNotifier to activate after the pipe has been read from. When that happened, the ioctl(2) call with FIONREAD might return 0 bytes available, which we interpreted to mean EOF. Instead of doing that, always try to read at least one byte and examine the returned byte count from read(2). If it returns 0, that's a real EOF; if it returns -1 EWOULDBLOCK, we simply ignore the situation. That's the case on OS X: the Cocoa event dispatcher uses CFSocket to get notifications and those use kevent (and, apparently, an auxiliary thread) instead of an in-thread select() or poll(). That means the event loop would activate the QSocketNotifier even though there is nothing to be read. Task-number: QTBUG-39488 Change-Id: I1a58b5b1db7a47034fb36a78a005ebff96290efb Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2014-06-05 23:44:07 +00:00
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <stdio.h>
Fix assorted MSVC warnings in tests. tst_collections.cpp tst_collections.cpp(3138) : warning C4305: 'argument' : truncation from 'size_t' to 'bool' tst_collections.cpp(3190) : see reference to function template instantiation 'void testContainerTypedefs<QVector<int>>(Container)' being compiled with[Container=QVector<int>] (repeated) tst_qringbuffer.cpp(297) : warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data tst_qringbuffer.cpp(300) : warning C4309: '=' : truncation of constant value tst_qringbuffer.cpp(306) : warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data tst_qrawfont.cpp(947) : warning C4309: 'argument' : truncation of constant value tst_qsslsocket_onDemandCertificates_member.cpp(217) : warning C4189: 'rootCertLoadingAllowed' : local variable is initialized but not referenced Change-Id: I6143d4ad121088a0d5bdd6dd2637eb3641a26096 Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
2015-01-15 13:00:19 +00:00
int main(int, char **argv)
QProcess: Handle spurious socket notifications for stdout and stderr On Unix systems where the GUI event dispatcher uses a notification system for socket notifiers that is out of band compared to select(), it's possible for the QSocketNotifier to activate after the pipe has been read from. When that happened, the ioctl(2) call with FIONREAD might return 0 bytes available, which we interpreted to mean EOF. Instead of doing that, always try to read at least one byte and examine the returned byte count from read(2). If it returns 0, that's a real EOF; if it returns -1 EWOULDBLOCK, we simply ignore the situation. That's the case on OS X: the Cocoa event dispatcher uses CFSocket to get notifications and those use kevent (and, apparently, an auxiliary thread) instead of an in-thread select() or poll(). That means the event loop would activate the QSocketNotifier even though there is nothing to be read. Task-number: QTBUG-39488 Change-Id: I1a58b5b1db7a47034fb36a78a005ebff96290efb Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2014-06-05 23:44:07 +00:00
{
const char *msg = argv[1];
char buf[2];
puts(msg);
fflush(stdout);
// wait for a newline
fgets(buf, sizeof buf, stdin);
puts(msg);
fflush(stdout);
return 0;
}
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