为什么OpenSSL会给我一个“不应调用的函数”错误？

我正在努力为服务器程序添加OpenSSL支持，并且总体上它工作得很好，但是遇到了一个问题。

首先，有一些背景知识：服务器是单线程的，并使用非阻塞I / O和select（）循环来同时处理多个客户端。服务器链接到libssl.0.9.8.dylib和lib crypto.0.9.8.dylib（即MacOS / X 10.8.5在/ usr / lib中提供的库）。客户端服务器协议是专有的全双工消息协议；也就是说，客户端和服务器都可以随时发送和接收数据，并且客户端-服务器的TCP连接可以无限期保持连接（即，直到客户端或服务器决定断开连接）。

问题是这样的：我的客户端可以连接到服务器，并且发送和接收数据也可以正常工作（现在我已经整理好了SSL_ERROR_WANT_WRITE和SSL_ERROR_WANT_READ逻辑）…但是如果服务器接受（）新的客户端连接，而其他客户端在发送或接收数据的过程中，SSL层似乎断开了。特别是，在服务器运行SetupSSL（）例程（如下所示）以设置新接受的套接字后，一个或多个其他（预先存在）的客户端套接字上的SSL_read（）将立即返回-1，并且ERR_print_errors_fp（stderr）给出以下输出：

SSL_read() ERROR:  5673:error:140F3042:SSL routines:SSL_UNDEFINED_CONST_FUNCTION:called a function you should not call:/SourceCache/OpenSSL098/OpenSSL098-47.2/src/ssl/ssl_lib.c:2248:

首次出现此错误后，服务器在很大程度上停止工作。数据移动停止，并且如果我尝试连接另一个客户端，我经常会遇到此错误：

SSL_read() ERROR: 5673:error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol:/SourceCache/OpenSSL098/OpenSSL098-47.2/src/ssl/s23_srvr.c:578: 

在我的测试场景中，这种情况发生的时间约为25％。如果我确定在新客户端连接时我现有的客户端连接处于空闲状态（没有发送或接收数据），则永远不会发生。有人知道这里可能出什么问题吗？我是否发现了OpenSSL错误，或者我忽略了某些细节？如果有帮助，请在下面粘贴我程序中的一些相关代码。

// Socket setup routine, called when the server accepts a new TCP socket
int SSLSession :: SetupSSL(int sockfd)
{
  _ctx = SSL_CTX_new(SSLv23_method());
  if (_ctx)
  {
     SSL_CTX_set_mode(_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);

     _ssl = SSL_new(_ctx);
     if (_ssl)
     {
        _sbio = BIO_new_socket(sockfd, BIO_NOCLOSE);
        if (_sbio)
        {
           SSL_set_bio(_ssl, _sbio, _sbio);
           SSL_set_accept_state(_ssl);

           BIO_set_nbio(_sbio, !blocking);
           ERR_print_errors_fp(stderr);

           return RESULT_SUCCESS;
        }
        else fprintf(stderr, "SSLSession:  BIO_new_socket() failed!\n");
     }
     else fprintf(stderr, "SSLSession:  SSL_new() failed!\n");
  }
  else fprintf(stderr, "SSLSession:  SSL_CTX_new() failed!\n");

  return RESULT_FAILURE;
}

// Socket read routine -- returns number of bytes read from SSL-land
int32 SSLSession :: Read(void *buffer, uint32 size)
{
  if (_ssl == NULL) return -1;

  int32 bytes = SSL_read(_ssl, buffer, size);
  if (bytes > 0) 
  {
     _sslState &= ~(SSL_STATE_READ_WANTS_READABLE_SOCKET | SSL_STATE_READ_WANTS_WRITEABLE_SOCKET);
  }
  else if (bytes == 0) return -1;  // connection was terminated
  else
  {
     int err = SSL_get_error(_ssl, bytes);
     if (err == SSL_ERROR_WANT_WRITE)
     {
        // We have to wait until our socket is writeable, and then repeat our SSL_read() call.
        _sslState &= ~SSL_STATE_READ_WANTS_READABLE_SOCKET;
        _sslState |=  SSL_STATE_READ_WANTS_WRITEABLE_SOCKET;
        bytes = 0;
     }
     else if (err == SSL_ERROR_WANT_READ)
     {
        // We have to wait until our socket is readable, and then repeat our SSL_read() call.
        _sslState |=  SSL_STATE_READ_WANTS_READABLE_SOCKET;
        _sslState &= ~SSL_STATE_READ_WANTS_WRITEABLE_SOCKET;
        bytes = 0;
     }
     else
     {
        fprintf(stderr, "SSL_read() ERROR:  ");
        ERR_print_errors_fp(stderr);
     }
  }
  return bytes;
}

// Socket write routine -- returns number of bytes written to SSL-land
int32 SSLSession :: Write(const void *buffer, uint32 size)
{
  if (_ssl == NULL) return -1;

  int32 bytes = SSL_write(_ssl, buffer, size);
  if (bytes > 0) 
  {
     _sslState &= ~(SSL_STATE_WRITE_WANTS_READABLE_SOCKET | SSL_STATE_WRITE_WANTS_WRITEABLE_SOCKET);
  }
  else if (bytes == 0) return -1;  // connection was terminated
  else
  {
     int err = SSL_get_error(_ssl, bytes);
     if (err == SSL_ERROR_WANT_READ)
     {
        // We have to wait until our socket is readable, and then repeat our SSL_write() call.
        _sslState |=  SSL_STATE_WRITE_WANTS_READABLE_SOCKET;
        _sslState &= ~SSL_STATE_WRITE_WANTS_WRITEABLE_SOCKET;
        bytes = 0;
     }
     else if (err == SSL_ERROR_WANT_WRITE)
     {
        // We have to wait until our socket is writeable, and then repeat our SSL_write() call.
        _sslState &= ~SSL_STATE_WRITE_WANTS_READABLE_SOCKET;
        _sslState |=  SSL_STATE_WRITE_WANTS_WRITEABLE_SOCKET;
        bytes = 0;
     }
     else
     {
        fprintf(stderr,"SSL_write() ERROR!");
        ERR_print_errors_fp(stderr);
     }
  }
  return bytes;
}