path: root/src
diff options
authorShane Kearns <>2012-02-20 18:48:10 +0000
committerQt by Nokia <>2012-03-01 00:09:57 +0100
commit46e4a9d5231e2d9e35424259858713ca539b8e30 (patch)
treee047636b446959812473c2da31658141b3db18ad /src
parentb147da00c5fec9d89a2b60d10e82ac28766e2a5b (diff)
Windows - fix getsockopt calls for narrower than int options
Windows unhelpfully writes to only one byte of the output buffer when getsockopt is called for a boolean option. Therefore we have to zero initialise the int rather than initialising to -1 as was done before. This in general only works for little endian architecture, because the word would look like 0x01000000 on big endian. So I have added some compile time asserts in the assumption that windows is always little endian. This is ok for comparisons with 0/false, but not comparisons with true or nonzero values. In the case of IPV6_V6ONLY, it is documented as DWORD (unsigned int) but on some windows versions it is returned as a boolean triggering the warning. I removed the warning, as the conversion to int works on both LE and BE since it is only compared with zero. Task-number: QTBUG-23488 Change-Id: I3c586d1ada76465fc045a82661f289920c657a4c Reviewed-by: Richard J. Moore <> Reviewed-by: Friedemann Kleint <> Reviewed-by: Andreas Holzammer <>
Diffstat (limited to 'src')
1 files changed, 7 insertions, 5 deletions
diff --git a/src/network/socket/qnativesocketengine_win.cpp b/src/network/socket/qnativesocketengine_win.cpp
index d7bbe7eb86..93a470c77f 100644
--- a/src/network/socket/qnativesocketengine_win.cpp
+++ b/src/network/socket/qnativesocketengine_win.cpp
@@ -427,10 +427,14 @@ int QNativeSocketEnginePrivate::option(QNativeSocketEngine::SocketOption opt) co
- int v = -1;
+#error code assumes windows is little endian
+ int v = 0; //note: windows doesn't write to all bytes if the option type is smaller than int
QT_SOCKOPTLEN_T len = sizeof(v);
- if (getsockopt(socketDescriptor, level, n, (char *) &v, &len) != -1)
+ if (getsockopt(socketDescriptor, level, n, (char *) &v, &len) == 0)
return v;
+ WS_ERROR_DEBUG(WSAGetLastError());
return -1;
@@ -563,12 +567,10 @@ bool QNativeSocketEnginePrivate::fetchConnectionParameters()
#if defined (IPV6_V6ONLY)
// determine if local address is dual mode
DWORD ipv6only = 0;
- int optlen = sizeof(ipv6only);
+ QT_SOCKOPTLEN_T optlen = sizeof(ipv6only);
if (localAddress == QHostAddress::AnyIPv6
&& QSysInfo::windowsVersion() >= QSysInfo::WV_6_0
&& !getsockopt(socketDescriptor, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&ipv6only, &optlen )) {
- if (optlen != sizeof(ipv6only))
- qWarning("unexpected size of IPV6_V6ONLY socket option");
if (!ipv6only) {
socketProtocol = QAbstractSocket::AnyIPProtocol;
localAddress = QHostAddress::Any;