* Windows 7 or lower have an undocumented minimum of 500ms for socket timeouts, detect at runtime and assume it as broken timeouts (https://social.msdn.microsoft.com/Forums/en-US/76620f6d-22b1-4872-aaf0-833204f3f867/minimum-timeout-value-for-sorcvtimeo)

Net/include/Poco/Net/SocketImpl.h

@@ -421,11 +421,10 @@ private:
 	SocketImpl& operator = (const SocketImpl&);
 	
 	poco_socket_t _sockfd;
-#if defined(POCO_BROKEN_TIMEOUTS)
 	Poco::Timespan _recvTimeout;
 	Poco::Timespan _sndTimeout;
-#endif
 	bool          _blocking;
+	bool          _isbrokentimeout;
 	
 	friend class Socket;
 	friend class SecureSocketImpl;

Net/src/SocketImpl.cpp

@@ -33,6 +33,11 @@
 #endif
 
 
+#ifdef POCO_OS_FAMILY_WINDOWS
+#include <Windows.h>
+#endif
+
+
 using Poco::IOException;
 using Poco::TimeoutException;
 using Poco::InvalidArgumentException;
@@ -44,16 +49,34 @@ namespace Poco {
 namespace Net {
 
 
+bool CheckIsBrokenTimeout()
+{
+#if defined(POCO_BROKEN_TIMEOUTS)
+	return true;
+#elif defined(POCO_OS_FAMILY_WINDOWS)
+	// on Windows 7 and lower, socket timeouts have a minimum of 500ms, use poll for timeouts on this case
+	// https://social.msdn.microsoft.com/Forums/en-US/76620f6d-22b1-4872-aaf0-833204f3f867/minimum-timeout-value-for-sorcvtimeo
+	OSVERSIONINFO vi;
+	vi.dwOSVersionInfoSize = sizeof(vi);
+	if (GetVersionEx(&vi) == 0) return true; //throw SystemException("Cannot get OS version information");
+	return vi.dwMajorVersion < 6 || (vi.dwMajorVersion == 6 && vi.dwMinorVersion < 2);
+#endif
+	return false;
+}
+
+
 SocketImpl::SocketImpl():
 	_sockfd(POCO_INVALID_SOCKET),
-	_blocking(true)
+	_blocking(true), 
+	_isbrokentimeout(CheckIsBrokenTimeout())
 {
 }
 
 
 SocketImpl::SocketImpl(poco_socket_t sockfd):
 	_sockfd(sockfd),
-	_blocking(true)
+	_blocking(true),
+	_isbrokentimeout(CheckIsBrokenTimeout())
 {
 }
 
@@ -262,13 +285,14 @@ void SocketImpl::shutdown()
 
 int SocketImpl::sendBytes(const void* buffer, int length, int flags)
 {
-#if defined(POCO_BROKEN_TIMEOUTS)
+	if (_isbrokentimeout)
-	if (_sndTimeout.totalMicroseconds() != 0)
 	{
-		if (!poll(_sndTimeout, SELECT_WRITE))
+		if (_sndTimeout.totalMicroseconds() != 0)
-			throw TimeoutException();
+		{
+			if (!poll(_sndTimeout, SELECT_WRITE))
+				throw TimeoutException();
+		}
 	}
-#endif
 
 	int rc;
 	do
@@ -284,13 +308,14 @@ int SocketImpl::sendBytes(const void* buffer, int length, int flags)
 
 int SocketImpl::receiveBytes(void* buffer, int length, int flags)
 {
-#if defined(POCO_BROKEN_TIMEOUTS)
+	if (_isbrokentimeout)
-	if (_recvTimeout.totalMicroseconds() != 0)
 	{
-		if (!poll(_recvTimeout, SELECT_READ))
+		if (_recvTimeout.totalMicroseconds() != 0)
-			throw TimeoutException();
+		{
+			if (!poll(_recvTimeout, SELECT_READ))
+				throw TimeoutException();
+		}
 	}
-#endif
 	
 	int rc;
 	do
@@ -333,13 +358,14 @@ int SocketImpl::sendTo(const void* buffer, int length, const SocketAddress& addr
 
 int SocketImpl::receiveFrom(void* buffer, int length, SocketAddress& address, int flags)
 {
-#if defined(POCO_BROKEN_TIMEOUTS)
+	if (_isbrokentimeout)
-	if (_recvTimeout.totalMicroseconds() != 0)
 	{
-		if (!poll(_recvTimeout, SELECT_READ))
+		if (_recvTimeout.totalMicroseconds() != 0)
-			throw TimeoutException();
+		{
+			if (!poll(_recvTimeout, SELECT_READ))
+				throw TimeoutException();
+		}
 	}
-#endif
 	
 	char abuffer[SocketAddress::MAX_ADDRESS_LENGTH];
 	struct sockaddr* pSA = reinterpret_cast<struct sockaddr*>(abuffer);
@@ -561,11 +587,11 @@ void SocketImpl::setSendTimeout(const Poco::Timespan& timeout)
 #if defined(_WIN32) && !defined(POCO_BROKEN_TIMEOUTS)
 	int value = (int) timeout.totalMilliseconds();
 	setOption(SOL_SOCKET, SO_SNDTIMEO, value);
-#elif defined(POCO_BROKEN_TIMEOUTS)
+#elif !defined(POCO_BROKEN_TIMEOUTS)
-	_sndTimeout = timeout;
-#else
 	setOption(SOL_SOCKET, SO_SNDTIMEO, timeout);
 #endif
+	if (_isbrokentimeout)
+		_sndTimeout = timeout;
 }
 
 
@@ -576,11 +602,11 @@ Poco::Timespan SocketImpl::getSendTimeout()
 	int value;
 	getOption(SOL_SOCKET, SO_SNDTIMEO, value);
 	result = Timespan::TimeDiff(value)*1000;
-#elif defined(POCO_BROKEN_TIMEOUTS)
+#elif !defined(POCO_BROKEN_TIMEOUTS)
-	result = _sndTimeout;
-#else
 	getOption(SOL_SOCKET, SO_SNDTIMEO, result);
 #endif
+	if (_isbrokentimeout)
+		result = _sndTimeout;
 	return result;
 }
 
@@ -594,9 +620,9 @@ void SocketImpl::setReceiveTimeout(const Poco::Timespan& timeout)
 #else
 	setOption(SOL_SOCKET, SO_RCVTIMEO, timeout);
 #endif
-#else
-	_recvTimeout = timeout;
 #endif
+	if (_isbrokentimeout)
+		_recvTimeout = timeout;
 }
 
 
@@ -607,11 +633,11 @@ Poco::Timespan SocketImpl::getReceiveTimeout()
 	int value;
 	getOption(SOL_SOCKET, SO_RCVTIMEO, value);
 	result = Timespan::TimeDiff(value)*1000;
-#elif defined(POCO_BROKEN_TIMEOUTS)
+#elif !defined(POCO_BROKEN_TIMEOUTS)
-	result = _recvTimeout;
-#else
 	getOption(SOL_SOCKET, SO_RCVTIMEO, result);
 #endif
+	if (_isbrokentimeout)
+		result = _recvTimeout;
 	return result;
 }