ACE学习之ACE_INET_Addr，ACE_SOCK_Acceptor 源代码

ACE_INET_Addr 用来封装了基本的LINUX Socket的连接。

 

首先了解一个结构体

 struct sockaddr_in
  {
    short            sin_family;   // e.g. AF_INET
    unsigned short   sin_port;     // e.g. htons(3490)
    struct in_addr   sin_addr;     // see struct in_addr, below
    char             sin_zero[8];  // zero this if you want to
  };

看到了这个结构体，应该熟悉到最基础的linux socket编程，就是要用到这些数据。。。

 

/* -*- C++ -*- */

//=============================================================================
/**
 *  @file    INET_Addr.h
 *
 *  $Id: INET_Addr.h 91626 2010-09-07 10:59:20Z johnnyw $
 *
 *  @author Douglas C. Schmidt <[email protected]>
 */
//=============================================================================

#ifndef ACE_INET_ADDR_H
#define ACE_INET_ADDR_H
#include /**/ "ace/pre.h"

#include "ace/Sock_Connect.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "ace/Addr.h"

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

/**
 * @class ACE_INET_Addr
 *
 * @brief Defines a C++ wrapper facade for the Internet domain address
 * family format.
 */
class ACE_Export ACE_INET_Addr : public ACE_Addr
{
public:
  // = Initialization methods.

  /// Default constructor.
  ACE_INET_Addr (void);

  /// Copy constructor.
  ACE_INET_Addr (const ACE_INET_Addr &);

  /// Creates an ACE_INET_Addr from a sockaddr_in structure.
  ACE_INET_Addr (const sockaddr_in *addr, int len);

  /// Creates an ACE_INET_Addr from a @a port_number and the remote
  /// @a host_name. The port number is assumed to be in host byte order.
  /// To set a port already in network byte order, please @see set().
  /// Use address_family to select IPv6 (PF_INET6) vs. IPv4 (PF_INET).
  ACE_INET_Addr (u_short port_number,
                 const char host_name[],
                 int address_family = AF_UNSPEC);

  /**
   * Initializes an ACE_INET_Addr from the @a address, which can be
   * "ip-number:port-number" (e.g., "tango.cs.wustl.edu:1234" or
   * "128.252.166.57:1234").  If there is no ':' in the @a address it
   * is assumed to be a port number, with the IP address being
   * INADDR_ANY.
   */
  explicit ACE_INET_Addr (const char address[],
                          int address_family = AF_UNSPEC);

  /**
   * Creates an ACE_INET_Addr from a @a port_number and an Internet
   * @a ip_addr.  This method assumes that @a port_number and @a ip_addr
   * are in host byte order. If you have addressing information in
   * network byte order, @see set().
   */
  explicit ACE_INET_Addr (u_short port_number,
                          ACE_UINT32 ip_addr = INADDR_ANY);

  /// Uses getservbyname() to create an ACE_INET_Addr from a
  /// @a port_name, the remote @a host_name, and the @a protocol.
  ACE_INET_Addr (const char port_name[],
                 const char host_name[],
                 const char protocol[] = "tcp");

  /**
   * Uses getservbyname() to create an ACE_INET_Addr from a
   * @a port_name, an Internet @a ip_addr, and the @a protocol.  This
   * method assumes that @a ip_addr is in host byte order.
   */
  ACE_INET_Addr (const char port_name[],
                 ACE_UINT32 ip_addr,
                 const char protocol[] = "tcp");

#if defined (ACE_HAS_WCHAR)
  ACE_INET_Addr (u_short port_number,
                 const wchar_t host_name[],
                 int address_family = AF_UNSPEC);

  explicit ACE_INET_Addr (const wchar_t address[],
                          int address_family = AF_UNSPEC);

  ACE_INET_Addr (const wchar_t port_name[],
                 const wchar_t host_name[],
                 const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));

  ACE_INET_Addr (const wchar_t port_name[],
                 ACE_UINT32 ip_addr,
                 const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));
#endif /* ACE_HAS_WCHAR */

  /// Default dtor.
  ~ACE_INET_Addr (void);

  // = Direct initialization methods.

  // These methods are useful after the object has been constructed.

  /// Initializes from another ACE_INET_Addr.
  int set (const ACE_INET_Addr &);

  /**
   * Initializes an ACE_INET_Addr from a @a port_number and the
   * remote @a host_name.  If @a encode is non-zero then @a port_number is
   * converted into network byte order, otherwise it is assumed to be
   * in network byte order already and are passed straight through.
   * address_family can be used to select IPv4/IPv6 if the OS has
   * IPv6 capability (ACE_HAS_IPV6 is defined). To specify IPv6, use
   * the value AF_INET6. To specify IPv4, use AF_INET.
   */
  int set (u_short port_number,
           const char host_name[],
           int encode = 1,
           int address_family = AF_UNSPEC);

  /**
   * Initializes an ACE_INET_Addr from a @a port_number and an Internet
   * @a ip_addr.  If @a encode is non-zero then the port number and IP address
   * are converted into network byte order, otherwise they are assumed to be
   * in network byte order already and are passed straight through.
   *
   * If @a map is non-zero and IPv6 support has been compiled in,
   * then this address will be set to the IPv4-mapped IPv6 address of it.
   */
  int set (u_short port_number,
           ACE_UINT32 ip_addr = INADDR_ANY,
           int encode = 1,
           int map = 0);

  /// Uses getservbyname() to initialize an ACE_INET_Addr from a
  /// @a port_name, the remote @a host_name, and the @a protocol.
  int set (const char port_name[],
           const char host_name[],
           const char protocol[] = "tcp");

  /**
   * Uses getservbyname() to initialize an ACE_INET_Addr from a
   * @a port_name, an @a ip_addr, and the @a protocol.  This assumes that
   * @a ip_addr is already in network byte order.
   */
  int set (const char port_name[],
           ACE_UINT32 ip_addr,
           const char protocol[] = "tcp");

  /**
   * Initializes an ACE_INET_Addr from the @a addr, which can be
   * "ip-number:port-number" (e.g., "tango.cs.wustl.edu:1234" or
   * "128.252.166.57:1234").  If there is no ':' in the @a address it
   * is assumed to be a port number, with the IP address being
   * INADDR_ANY.
   */
  int set (const char addr[], int address_family = AF_UNSPEC);

  /// Creates an ACE_INET_Addr from a sockaddr_in structure.
  int set (const sockaddr_in *,
           int len);

#if defined (ACE_HAS_WCHAR)
  int set (u_short port_number,
           const wchar_t host_name[],
           int encode = 1,
           int address_family = AF_UNSPEC);

  int set (const wchar_t port_name[],
           const wchar_t host_name[],
           const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));

  int set (const wchar_t port_name[],
           ACE_UINT32 ip_addr,
           const wchar_t protocol[] = ACE_TEXT_WIDE ("tcp"));

  int set (const wchar_t addr[], int address_family = AF_UNSPEC);
#endif /* ACE_HAS_WCHAR */

  /// Return a pointer to the underlying network address.
  virtual void *get_addr (void) const;
  int get_addr_size(void) const;

  /// Set a pointer to the address.
  virtual void set_addr (void *, int len);

  /// Set a pointer to the address.
  virtual void set_addr (void *, int len, int map);

  /**
   * Transform the current ACE_INET_Addr address into string format.
   * If @a ipaddr_format is ttrue this produces "ip-number:port-number"
   * (e.g., "128.252.166.57:1234"), whereas if @a ipaddr_format is false
   * this produces "ip-name:port-number" (e.g.,
   * "tango.cs.wustl.edu:1234").  Returns -1 if the @a size of the
   * @a buffer is too small, else 0.
   */
  virtual int addr_to_string (ACE_TCHAR buffer[],
                              size_t size,
                              int ipaddr_format = 1) const;

  /**
   * Initializes an ACE_INET_Addr from the @a address, which can be
   * "ip-addr:port-number" (e.g., "tango.cs.wustl.edu:1234"),
   * "ip-addr:port-name" (e.g., "tango.cs.wustl.edu:telnet"),
   * "ip-number:port-number" (e.g., "128.252.166.57:1234"), or
   * "ip-number:port-name" (e.g., "128.252.166.57:telnet").  If there
   * is no ':' in the @a address it is assumed to be a port number,
   * with the IP address being INADDR_ANY.
   */
  virtual int string_to_addr (const char address[],
                              int address_family = AF_UNSPEC);

#if defined (ACE_HAS_WCHAR)
  /*
  virtual int string_to_addr (const char address[]);
  */
#endif /* ACE_HAS_WCHAR */

  /**
   * Sets the port number without affecting the host name.  If
   * @a encode is enabled then @a port_number is converted into network
   * byte order, otherwise it is assumed to be in network byte order
   * already and are passed straight through.
   */
  void set_port_number (u_short,
                        int encode = 1);

  /**
   * Sets the address without affecting the port number.  If
   * @a encode is enabled then @a ip_addr is converted into network
   * byte order, otherwise it is assumed to be in network byte order
   * already and are passed straight through.  The size of the address
   * is specified in the @a len parameter.
   * If @a map is non-zero, IPv6 support has been compiled in, and
   * @a ip_addr is an IPv4 address, then this address is set to the IPv4-mapped
   * IPv6 address of it.
   */
  int set_address (const char *ip_addr,
                   int len,
                   int encode = 1,
                   int map = 0);

#if (defined (__linux__) || defined (ACE_WIN32)) && defined (ACE_HAS_IPV6)
  /**
   * Sets the interface that should be used for this address. This only has
   * an effect when the address is link local, otherwise it does nothing.
   */
  int set_interface (const char *intf_name);
#endif /* (__linux__ || ACE_WIN32) && ACE_HAS_IPV6 */

  /// Return the port number, converting it into host byte-order.
  u_short get_port_number (void) const;

  /**
   * Return the character representation of the name of the host,
   * storing it in the @a hostname (which is assumed to be
   * @a hostnamelen bytes long).  This version is reentrant.  If
   * @a hostnamelen is greater than 0 then @a hostname will be
   * NUL-terminated even if -1 is returned.
   */
  int get_host_name (char hostname[],
                     size_t hostnamelen) const;

#if defined (ACE_HAS_WCHAR)
  int get_host_name (wchar_t hostname[],
                     size_t hostnamelen) const;
#endif /* ACE_HAS_WCHAR */

  /**
   * Return the character representation of the hostname.  This
   * version is non-reentrant since it returns a pointer to a static
   * data area.  You should therefore either (1) do a "deep copy" of
   * the address returned by get_host_name(), e.g., using strdup() or
   * (2) use the "reentrant" version of get_host_name() described
   * above.
   */
  const char *get_host_name (void) const;

  /**
   * Return the "dotted decimal" Internet address representation of
   * the hostname storing it in the @a addr (which is assumed to be
   * @a addr_size bytes long).  This version is reentrant.
   */
  const char *get_host_addr (char *addr, int addr_size) const;

  /**
   * Return the "dotted decimal" Internet address representation of
   * the hostname.  This version is non-reentrant since it returns a
   * pointer to a static data area.  You should therefore either
   * (1) do a "deep copy" of the address returned by get_host_addr(), e.g.,
   * using strdup() or (2) use the "reentrant" version of
   * get_host_addr() described above.
   */
  const char *get_host_addr (void) const;

  /// Return the 4-byte IP address, converting it into host byte
  /// order.
  ACE_UINT32 get_ip_address (void) const;

  /// Return @c true if the IP address is INADDR_ANY or IN6ADDR_ANY.
  bool is_any (void) const;

  /// Return @c true if the IP address is IPv4/IPv6 loopback address.
  bool is_loopback (void) const;

  /// Return @c true if the IP address is IPv4/IPv6 multicast address.
  bool is_multicast (void) const;

#if defined (ACE_HAS_IPV6)
  /// Return @c true if the IP address is IPv6 linklocal address.
  bool is_linklocal (void) const;

  /// Return @c true if the IP address is IPv4-mapped IPv6 address.
  bool is_ipv4_mapped_ipv6 (void) const;

  /// Return @c true if the IP address is IPv4-compatible IPv6 address.
  bool is_ipv4_compat_ipv6 (void) const;
#endif /* ACE_HAS_IPV6 */

  /**
   * Returns @c true if @c this is less than @a rhs.  In this context,
   * "less than" is defined in terms of IP address and TCP port
   * number.  This operator makes it possible to use @c ACE_INET_Addrs
   * in STL maps.
   */
  bool operator < (const ACE_INET_Addr &rhs) const;

  /// Compare two addresses for equality.  The addresses are considered
  /// equal if they contain the same IP address and port number.
  bool operator == (const ACE_INET_Addr &SAP) const;

  /// Compare two addresses for inequality.
  bool operator != (const ACE_INET_Addr &SAP) const;

  /// A variation of the equality operator, this method only compares the
  /// IP address and ignores the port number.
  bool is_ip_equal (const ACE_INET_Addr &SAP) const;

  /// Computes and returns hash value.
  virtual u_long hash (void) const;

  /// Dump the state of an object.
  void dump (void) const;

  /// Declare the dynamic allocation hooks.
  ACE_ALLOC_HOOK_DECLARE;

private:
  /// Insure that @a hostname is properly null-terminated.
  int get_host_name_i (char hostname[], size_t hostnamelen) const;

  // Methods to gain access to the actual address of
  // the underlying internet address structure.
  void *ip_addr_pointer (void) const;
  int ip_addr_size (void) const;
  int determine_type (void) const;

  /// Initialize underlying inet_addr_ to default values
  void reset (void);

  /// Underlying representation.
  /// This union uses the knowledge that the two structures share the
  /// first member, sa_family (as all sockaddr structures do).
  union
  {
    sockaddr_in  in4_;
#if defined (ACE_HAS_IPV6)
    sockaddr_in6 in6_;
#endif /* ACE_HAS_IPV6 */
  } inet_addr_;
};

ACE_END_VERSIONED_NAMESPACE_DECL

#if defined (__ACE_INLINE__)
#include "ace/INET_Addr.inl"
#endif /* __ACE_INLINE__ */

#include /**/ "ace/post.h"
#endif /* ACE_INET_ADDR_H */

 

首先，我们可以看到，该类对网络地址和端口号进行了封装。尤其是对tcp下的IPV4和IPV6.进行了完美的封装。

如何使用呢？

 ACE_SOCK_Acceptor  m_acceptorSocket;

 ACE_INET_Addr  acceptorAddr;    
 acceptorAddr.set(atoi(port));
m_acceptorSocket.open(acceptorAddr, 1);

这样就建立了一个侦听的端口，等待客户端进行请求连接。下面就介绍一下ACE_SOCK_Acceptor

ACE_SOCK_Acceptor

ACE_SOCK_Acceptor 该类封装了acceptor,一种被动客户连接的一个类。学过底层应该都知道。。

/* -*- C++ -*- */

//=============================================================================
/**
 *  @file    SOCK_Acceptor.h
 *
 *  $Id: SOCK_Acceptor.h 82723 2008-09-16 09:35:44Z johnnyw $
 *
 *  @author Douglas C. Schmidt <[email protected]>
 */
//=============================================================================

#ifndef ACE_SOCK_ACCEPTOR_H
#define ACE_SOCK_ACCEPTOR_H
#include /**/ "ace/pre.h"

#include "ace/SOCK_Stream.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

class ACE_Time_Value;
class ACE_Accept_QoS_Params;

/**
 * @class ACE_SOCK_Acceptor
 *
 * @brief Defines a factory that creates new ACE_Streams passively.
 *
 * The ACE_SOCK_Acceptor has its own "passive-mode" socket.
 * This serves as a factory to create so-called "data-mode"
 * sockets, which are what the ACE_SOCK_Stream encapsulates.
 * Therefore, by inheriting from ACE_SOCK, ACE_SOCK_Acceptor
 * gets its very own socket.
 */
class ACE_Export ACE_SOCK_Acceptor : public ACE_SOCK
{
public:
  // = Initialization and termination methods.
  /// Default constructor.
  ACE_SOCK_Acceptor (void);

  /**
   * Initialize a passive-mode BSD-style acceptor socket (no QoS).
   * @a local_sap is the address that we're going to listen for
   * connections on.  If @a reuse_addr is 1 then we'll use the
   * @c SO_REUSEADDR to reuse this address.
   */
  ACE_SOCK_Acceptor (const ACE_Addr &local_sap,
                     int reuse_addr = 0,
                     int protocol_family = PF_UNSPEC,
                     int backlog = ACE_DEFAULT_BACKLOG,
                     int protocol = 0);

  /// Initialize a passive-mode QoS-enabled acceptor socket.  Returns 0
  /// on success and -1 on failure.
  ACE_SOCK_Acceptor (const ACE_Addr &local_sap,
                     ACE_Protocol_Info *protocolinfo,
                     ACE_SOCK_GROUP g,
                     u_long flags,
                     int reuse_addr,
                     int protocol_family = PF_UNSPEC,
                     int backlog = ACE_DEFAULT_BACKLOG,
                     int protocol = 0);

  /**
   * Initialize a passive-mode BSD-style acceptor socket (no QoS).
   * @a local_sap is the address that we're going to listen for
   * connections on.  If @a reuse_addr is 1 then we'll use the
   * @c SO_REUSEADDR to reuse this address.  Returns 0 on success and
   * -1 on failure.
   */
  int open (const ACE_Addr &local_sap,
            int reuse_addr = 0,
            int protocol_family = PF_UNSPEC,
            int backlog = ACE_DEFAULT_BACKLOG,
            int protocol = 0);

  /// Initialize a passive-mode QoS-enabled acceptor socket.  Returns 0
  /// on success and -1 on failure.
  int open (const ACE_Addr &local_sap,
            ACE_Protocol_Info *protocolinfo,
            ACE_SOCK_GROUP g,
            u_long flags,
            int reuse_addr,
            int protocol_family = PF_UNSPEC,
            int backlog = ACE_DEFAULT_BACKLOG,
            int protocol = 0);

  /// Close the socket.  Returns 0 on success and -1 on failure.
  int close (void);

  /// Default dtor.
  ~ACE_SOCK_Acceptor (void);

  // = Passive connection <accept> methods.
  /**
   * Accept a new ACE_SOCK_Stream connection.  A @a timeout of 0
   * means block forever, a @a timeout of {0, 0} means poll.  @a restart
   * == true means "restart if interrupted," i.e., if errno == EINTR.
   * Note that @a new_stream inherits the "blocking mode" of @c this
   * ACE_SOCK_Acceptor, i.e., if @c this acceptor factory is in
   * non-blocking mode, the @a new_stream will be in non-blocking mode
   * and vice versa.
   */
  int accept (ACE_SOCK_Stream &new_stream,
              ACE_Addr *remote_addr = 0,
              ACE_Time_Value *timeout = 0,
              bool restart = true,
              bool reset_new_handle = false) const;

#if !defined (ACE_HAS_WINCE)
  /**
   * Accept a new ACE_SOCK_Stream connection using the QoS
   * information in @a qos_params.  A @a timeout of 0 means block
   * forever, a @a timeout of {0, 0} means poll.  @a restart == true means
   * "restart if interrupted," i.e., if errno == EINTR.  Note that
   * @a new_stream inherits the "blocking mode" of @c this
   * ACE_SOCK_Acceptor, i.e., if @c this acceptor factory is in
   * non-blocking mode, the @a new_stream will be in non-blocking mode
   * and vice versa.
   */
  int accept (ACE_SOCK_Stream &new_stream,
              ACE_Accept_QoS_Params qos_params,
              ACE_Addr *remote_addr = 0,
              ACE_Time_Value *timeout = 0,
              bool restart = true,
              bool reset_new_handle = false) const;
#endif  // ACE_HAS_WINCE

  // = Meta-type info
  typedef ACE_INET_Addr PEER_ADDR;
  typedef ACE_SOCK_Stream PEER_STREAM;

  /// Dump the state of an object.
  void dump (void) const;

  /// Declare the dynamic allocation hooks.
  ACE_ALLOC_HOOK_DECLARE;

protected:
  /// Perform operations that must occur before <ACE_OS::accept> is
  /// called.
  int shared_accept_start (ACE_Time_Value *timeout,
                           bool restart,
                           int &in_blocking_mode) const;

  /// Perform operations that must occur after <ACE_OS::accept> is
  /// called.
  int shared_accept_finish (ACE_SOCK_Stream new_stream,
                            int in_blocking_mode,
                            bool reset_new_handle) const;

  /**
   * This method factors out the common <open> code and is called by
   * both the QoS-enabled <open> method and the BSD-style <open>
   * method.
   */
  int shared_open (const ACE_Addr &local_sap,
                   int protocol_family,
                   int backlog);

private:
  /// Do not allow this function to percolate up to this interface...
  int get_remote_addr (ACE_Addr &) const;
};

ACE_END_VERSIONED_NAMESPACE_DECL

#if defined (__ACE_INLINE__)
#include "ace/SOCK_Acceptor.inl"
#endif /* __ACE_INLINE__ */

#include /**/ "ace/post.h"
#endif /* ACE_SOCK_ACCEPTOR_H */

 

这个是一种被动模式啊~