common/include/QtNetwork/5.5.0/QtNetwork/private/qnet_unix_p.h

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**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
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** This file is part of the QtNetwork module of the Qt Toolkit.
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#ifndef QNET_UNIX_P_H
#define QNET_UNIX_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of Qt code on Unix. This header file may change from version to
// version to version without notice, or even be removed.
//
// We mean it.
//

#include "private/qcore_unix_p.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#if defined(Q_OS_VXWORKS)
#  include <sockLib.h>
#endif

// for inet_addr
#include <netdb.h>
#include <arpa/inet.h>
#if defined(Q_OS_VXWORKS)
#  include <hostLib.h>
#else
#  include <resolv.h>
#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

// UnixWare 7 redefines socket -> _socket
static inline int qt_safe_socket(int domain, int type, int protocol, int flags = 0)
{
    Q_ASSERT((flags & ~O_NONBLOCK) == 0);

    int fd;
#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
    int newtype = type | SOCK_CLOEXEC;
    if (flags & O_NONBLOCK)
        newtype |= SOCK_NONBLOCK;
    fd = ::socket(domain, newtype, protocol);
    if (fd != -1 || errno != EINVAL)
        return fd;
#endif

    fd = ::socket(domain, type, protocol);
    if (fd == -1)
        return -1;

    ::fcntl(fd, F_SETFD, FD_CLOEXEC);

    // set non-block too?
    if (flags & O_NONBLOCK)
        ::fcntl(fd, F_SETFL, ::fcntl(fd, F_GETFL) | O_NONBLOCK);

    return fd;
}

// Tru64 redefines accept -> _accept with _XOPEN_SOURCE_EXTENDED
static inline int qt_safe_accept(int s, struct sockaddr *addr, QT_SOCKLEN_T *addrlen, int flags = 0)
{
    Q_ASSERT((flags & ~O_NONBLOCK) == 0);

    int fd;
#if QT_UNIX_SUPPORTS_THREADSAFE_CLOEXEC && defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
    // use accept4
    int sockflags = SOCK_CLOEXEC;
    if (flags & O_NONBLOCK)
        sockflags |= SOCK_NONBLOCK;
    fd = ::accept4(s, addr, static_cast<QT_SOCKLEN_T *>(addrlen), sockflags);
    if (fd != -1 || !(errno == ENOSYS || errno == EINVAL))
        return fd;
#endif

    fd = ::accept(s, addr, static_cast<QT_SOCKLEN_T *>(addrlen));
    if (fd == -1)
        return -1;

    ::fcntl(fd, F_SETFD, FD_CLOEXEC);

    // set non-block too?
    if (flags & O_NONBLOCK)
        ::fcntl(fd, F_SETFL, ::fcntl(fd, F_GETFL) | O_NONBLOCK);

    return fd;
}

// UnixWare 7 redefines listen -> _listen
static inline int qt_safe_listen(int s, int backlog)
{
    return ::listen(s, backlog);
}

static inline int qt_safe_connect(int sockfd, const struct sockaddr *addr, QT_SOCKLEN_T addrlen)
{
    int ret;
    // Solaris e.g. expects a non-const 2nd parameter
    EINTR_LOOP(ret, QT_SOCKET_CONNECT(sockfd, const_cast<struct sockaddr *>(addr), addrlen));
    return ret;
}
#undef QT_SOCKET_CONNECT
#define QT_SOCKET_CONNECT qt_safe_connect

#if defined(socket)
# undef socket
#endif
#if defined(accept)
# undef accept
#endif
#if defined(listen)
# undef listen
#endif

// VxWorks' headers specify 'int' instead of '...' for the 3rd ioctl() parameter.
template <typename T>
static inline int qt_safe_ioctl(int sockfd, int request, T arg)
{
#ifdef Q_OS_VXWORKS
    return ::ioctl(sockfd, request, (int) arg);
#else
    return ::ioctl(sockfd, request, arg);
#endif
}

// VxWorks' headers do not specify any const modifiers
static inline in_addr_t qt_safe_inet_addr(const char *cp)
{
#ifdef Q_OS_VXWORKS
    return ::inet_addr((char *) cp);
#else
    return ::inet_addr(cp);
#endif
}

// VxWorks' headers do not specify any const modifiers
static inline int qt_safe_sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *to, QT_SOCKLEN_T tolen)
{
#ifdef MSG_NOSIGNAL
    flags |= MSG_NOSIGNAL;
#else
    qt_ignore_sigpipe();
#endif

    int ret;
#ifdef Q_OS_VXWORKS
    EINTR_LOOP(ret, ::sendto(sockfd, (char *) buf, len, flags, (struct sockaddr *) to, tolen));
#else
    EINTR_LOOP(ret, ::sendto(sockfd, buf, len, flags, to, tolen));
#endif
    return ret;
}

QT_END_NAMESPACE

#endif // QNET_UNIX_P_H