source: trunk/src/network/kernel/qhostinfo_unix.cpp@ 467

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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//#define QHOSTINFO_DEBUG

static const int RESOLVER_TIMEOUT = 2000;

#include "qplatformdefs.h"

#include "qhostinfo_p.h"
#include "qiodevice.h"
#include <qbytearray.h>
#include <qlibrary.h>
#include <qurl.h>
#include <qfile.h>
#include <private/qmutexpool_p.h>

extern "C" {
#include <sys/types.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <resolv.h>
}

#if defined (QT_NO_GETADDRINFO)
#include <qmutex.h>
QT_BEGIN_NAMESPACE
Q_GLOBAL_STATIC(QMutex, getHostByNameMutex)
QT_END_NAMESPACE
#endif

QT_BEGIN_NAMESPACE

// Almost always the same. If not, specify in qplatformdefs.h.
#if !defined(QT_SOCKOPTLEN_T)
# define QT_SOCKOPTLEN_T QT_SOCKLEN_T
#endif

// HP-UXi has a bug in getaddrinfo(3) that makes it thread-unsafe
// with this flag. So disable it in that platform.
#if defined(AI_ADDRCONFIG) && !defined(Q_OS_HPUX)
#  define Q_ADDRCONFIG          AI_ADDRCONFIG
#endif

typedef struct __res_state *res_state_ptr;

typedef int (*res_init_proto)(void);
static res_init_proto local_res_init = 0;
typedef int (*res_ninit_proto)(res_state_ptr);
static res_ninit_proto local_res_ninit = 0;
typedef void (*res_nclose_proto)(res_state_ptr);
static res_nclose_proto local_res_nclose = 0;
static res_state_ptr local_res = 0;

static void resolveLibrary()
{
#ifndef QT_NO_LIBRARY
    QLibrary lib(QLatin1String("resolv"));
    if (!lib.load())
        return;

    local_res_init = res_init_proto(lib.resolve("__res_init"));
    if (!local_res_init)
        local_res_init = res_init_proto(lib.resolve("res_init"));