tst_QTcpServer: Output useful more useful info for addressReusable

To try to figure out why QProcess::waitForReadyRead is returning false
so quickly. Though we know it's going to be "Address in use".

FAIL  : tst_QTcpServer::addressReusable(WithoutProxy) 'process.waitForReadyRead(5000)' returned FALSE. (Failed to listen: The bound address is already in use
Netid State  Recv-Q Send-Q Local Address:Port  Peer Address:PortProcess
tcp   LISTEN 0      50         127.0.0.1:49199      0.0.0.0:*    users:(("crashingServer",pid=40529,fd=4))
)

Pick-to: 6.4 6.2
Change-Id: Ic43a460bfc7c7eb6379405b7a1a064e502b6fef3
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

2 files changed, 16 insertions, 2 deletions

diff --git a/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp b/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
index 5e00a2bd20..08f234aa3e 100644
--- a/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
+++ b/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
@@ -7,6 +7,9 @@
 #if defined(Q_OS_WIN) && defined(Q_CC_MSVC)
 #  include <crtdbg.h>
 #endif
+#ifdef Q_OS_UNIX
+#  include <unistd.h>
+#endif
 
 int main(int argc, char *argv[])
 {
@@ -18,7 +21,18 @@ int main(int argc, char *argv[])
 
     QTcpServer server;
     if (!server.listen(QHostAddress::LocalHost, 49199)) {
-        qDebug("Failed to listen: %s", server.errorString().toLatin1().constData());
+        fprintf(stderr, "Failed to listen: %s\n", server.errorString().toLatin1().constData());
+        if (server.serverError() == QTcpSocket::AddressInUseError) {
+            // let's see if we can find the process that would be holding this
+            // still open
+#ifdef Q_OS_LINUX
+            static const char *ss_args[] = {
+                "ss", "-nap", "sport", "=", ":49199", nullptr
+            };
+            dup2(STDERR_FILENO, STDOUT_FILENO);
+            execvp(ss_args[0], const_cast<char **>(ss_args));
+#endif
+        }
         return 1;
     }
 
diff --git a/tests/auto/network/socket/qtcpserver/tst_qtcpserver.cpp b/tests/auto/network/socket/qtcpserver/tst_qtcpserver.cpp
index d1fa84f7d0..e47c8f4654 100644
--- a/tests/auto/network/socket/qtcpserver/tst_qtcpserver.cpp
+++ b/tests/auto/network/socket/qtcpserver/tst_qtcpserver.cpp
@@ -594,7 +594,7 @@ void tst_QTcpServer::addressReusable()
     process.start(processExe);
     QVERIFY2(process.waitForStarted(), qPrintable(
         QString::fromLatin1("Could not start %1: %2").arg(processExe, process.errorString())));
-    QVERIFY(process.waitForReadyRead(5000));
+    QVERIFY2(process.waitForReadyRead(5000), qPrintable(process.readAllStandardError()));
 
     QTcpSocket socket;
     socket.connectToHost(QHostAddress::LocalHost, 49199);