/**
 * Copyright 2012 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/base/init.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/net/socket_poll.h"

namespace mongo {

#ifdef _WIN32

typedef int(WSAAPI* WSAPollFunction)(pollfd* fdarray, ULONG nfds, INT timeout);

static WSAPollFunction wsaPollFunction = NULL;

MONGO_INITIALIZER(DynamicLinkWin32Poll)(InitializerContext* context) {
    HINSTANCE wsaPollLib = LoadLibraryW(L"Ws2_32.dll");
    if (wsaPollLib) {
        wsaPollFunction = reinterpret_cast<WSAPollFunction>(GetProcAddress(wsaPollLib, "WSAPoll"));
    }

    return Status::OK();
}

bool isPollSupported() {
    return wsaPollFunction != NULL;
}

int socketPoll(pollfd* fdarray, unsigned long nfds, int timeout) {
    fassert(17185, isPollSupported());
    return wsaPollFunction(fdarray, nfds, timeout);
}

#else

bool isPollSupported() {
    return true;
}

int socketPoll(pollfd* fdarray, unsigned long nfds, int timeout) {
    return ::poll(fdarray, nfds, timeout);
}

#endif
}