Upstream vwifi v7.0 (Raizo62/vwifi @ 4a9842e)

Unmodified upstream source from https://github.com/Raizo62/vwifi
Commit: 4a9842e "CMakeLists.txt : VERSION = 7.0"

Simulator of WiFi (802.11) interfaces to communicate between
several Virtual Machines via mac80211_hwsim + TCP relay.

License: Apache-2.0

src/cselect.cc

@@ -0,0 +1,99 @@
+#include <errno.h> // errno
+#include <assert.h> // assert
+#include <cstddef> // NULL
+
+#include "cselect.h"
+
+using namespace std;
+
+CSelect::CSelect()
+{
+	Init();
+}
+
+void CSelect::Init()
+{
+	//clear the socket set
+	FD_ZERO(&Master);
+
+	//clear the socket set
+	FD_ZERO(&Dup);
+
+	MaxDescriptor=-1;
+}
+
+void CSelect::UpdateMaxDescriptor(TDescriptor descriptor)
+{
+	//highest file descriptor number, need it for the select function
+	if ( descriptor > MaxDescriptor )
+		MaxDescriptor=descriptor;
+}
+
+bool CSelect::AddNode(TDescriptor descriptor)
+{
+	//add new socket to array of sockets
+	ListNodes.push_back(descriptor);
+
+	//add child sockets to set
+	FD_SET( descriptor , &Master);
+
+	//highest file descriptor number, need it for the select function
+	UpdateMaxDescriptor(descriptor);
+
+	return true;
+}
+
+void CSelect::DelNode(TDescriptor descriptor)
+{
+	MaxDescriptor=-1;
+	for (auto node = ListNodes.begin() ; node != ListNodes.end(); ++node)
+	{
+		if( *node == descriptor )
+		{
+			auto node_to_delete = node;
+
+			FD_CLR(descriptor , &Master);
+
+			for (++node ; node != ListNodes.end(); ++node)
+				UpdateMaxDescriptor(*node);
+
+			ListNodes.erase(node_to_delete);
+
+			return;
+		}
+		UpdateMaxDescriptor(*node);
+	}
+}
+
+TDescriptor CSelect::Wait()
+{
+	return Wait(NULL);
+}
+
+TDescriptor CSelect::Wait(const sigset_t *sigmask)
+{
+	/* back up master */
+	Dup = Master;
+
+	//wait for an activity on one of the sockets , timeout is NULL ,
+	//so wait indefinitely
+	int activity=pselect( MaxDescriptor + 1 , &Dup , NULL , NULL , NULL, sigmask);
+
+	if ((activity < 0) && (errno!=EINTR))
+		return SCHEDULER_ERROR;
+
+	return activity;
+}
+
+
+bool CSelect::DescriptorHasAction(TDescriptor descriptor)
+{
+	return FD_ISSET( descriptor , &Dup);
+}
+
+bool CSelect::NodeHasAction(TIndex index)
+{
+	assert( index < ListNodes.size() );
+
+	return FD_ISSET( ListNodes[index] , &Dup);
+}