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5.0

/*
 Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.4 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#include <poll.h>
#include <unistd.h>
#include "Poller.h"
#include "Platform/SystemException.h"

namespace TrueCrypt
{
	Poller::Poller (int fileDescriptor1, int fileDescriptor2, int fileDescriptor3, int fileDescriptor4)
	{
		FileDescriptors.push_back (fileDescriptor1);

		if (fileDescriptor2 != -1)
			FileDescriptors.push_back (fileDescriptor2);

		if (fileDescriptor3 != -1)
			FileDescriptors.push_back (fileDescriptor3);

		if (fileDescriptor4 != -1)
			FileDescriptors.push_back (fileDescriptor4);
	}

	list <int> Poller::WaitForData (int timeOut) const
	{
		vector <pollfd> pfd (FileDescriptors.size());
		for (int i = 0; i < FileDescriptors.size(); i++)
		{
			pfd[i].fd = FileDescriptors[i];
			pfd[i].events = POLLIN;
		}

		list <int> descList;

		int pollRes = poll (&pfd[0], pfd.size(), timeOut);

		if (pollRes == 0 && timeOut != -1)
			throw TimeOut (SRC_POS);

		if (pollRes > 0)
		{
			for (int i = 0; i < pfd.size(); i++)
			{
				if (pfd[i].revents & POLLIN)
					descList.push_back (pfd[i].fd);
			}
		}

		return descList;
	}
}

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