text: /*
   * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #ifndef HEADER_BIO_H
  # define HEADER_BIO_H
  
  # include <openssl/e_os2.h>
  
  # ifndef OPENSSL_NO_STDIO
  #  include <stdio.h>
  # endif
  # include <stdarg.h>
  
  # include <openssl/crypto.h>
  # include <openssl/bioerr.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /* There are the classes of BIOs */
  # define BIO_TYPE_DESCRIPTOR     0x0100 /* socket, fd, connect or accept */
  # define BIO_TYPE_FILTER         0x0200
  # define BIO_TYPE_SOURCE_SINK    0x0400
  
  /* These are the 'types' of BIOs */
  # define BIO_TYPE_NONE             0
  # define BIO_TYPE_MEM            ( 1|BIO_TYPE_SOURCE_SINK)
  # define BIO_TYPE_FILE           ( 2|BIO_TYPE_SOURCE_SINK)
  
  # define BIO_TYPE_FD             ( 4|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
  # define BIO_TYPE_SOCKET         ( 5|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
  # define BIO_TYPE_NULL           ( 6|BIO_TYPE_SOURCE_SINK)
  # define BIO_TYPE_SSL            ( 7|BIO_TYPE_FILTER)
  # define BIO_TYPE_MD             ( 8|BIO_TYPE_FILTER)
  # define BIO_TYPE_BUFFER         ( 9|BIO_TYPE_FILTER)
  # define BIO_TYPE_CIPHER         (10|BIO_TYPE_FILTER)
  # define BIO_TYPE_BASE64         (11|BIO_TYPE_FILTER)
  # define BIO_TYPE_CONNECT        (12|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
  # define BIO_TYPE_ACCEPT         (13|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
  
  # define BIO_TYPE_NBIO_TEST      (16|BIO_TYPE_FILTER)/* server proxy BIO */
  # define BIO_TYPE_NULL_FILTER    (17|BIO_TYPE_FILTER)
  # define BIO_TYPE_BIO            (19|BIO_TYPE_SOURCE_SINK)/* half a BIO pair */
  # define BIO_TYPE_LINEBUFFER     (20|BIO_TYPE_FILTER)
  # define BIO_TYPE_DGRAM          (21|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
  # define BIO_TYPE_ASN1           (22|BIO_TYPE_FILTER)
  # define BIO_TYPE_COMP           (23|BIO_TYPE_FILTER)
  # ifndef OPENSSL_NO_SCTP
  #  define BIO_TYPE_DGRAM_SCTP    (24|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
  # endif
  
  #define BIO_TYPE_START           128
  
  /*
   * BIO_FILENAME_READ|BIO_CLOSE to open or close on free.
   * BIO_set_fp(in,stdin,BIO_NOCLOSE);
   */
  # define BIO_NOCLOSE             0x00
  # define BIO_CLOSE               0x01
  
  /*
   * These are used in the following macros and are passed to BIO_ctrl()
   */
  # define BIO_CTRL_RESET          1/* opt - rewind/zero etc */
  # define BIO_CTRL_EOF            2/* opt - are we at the eof */
  # define BIO_CTRL_INFO           3/* opt - extra tit-bits */
  # define BIO_CTRL_SET            4/* man - set the 'IO' type */
  # define BIO_CTRL_GET            5/* man - get the 'IO' type */
  # define BIO_CTRL_PUSH           6/* opt - internal, used to signify change */
  # define BIO_CTRL_POP            7/* opt - internal, used to signify change */
  # define BIO_CTRL_GET_CLOSE      8/* man - set the 'close' on free */
  # define BIO_CTRL_SET_CLOSE      9/* man - set the 'close' on free */
  # define BIO_CTRL_PENDING        10/* opt - is their more data buffered */
  # define BIO_CTRL_FLUSH          11/* opt - 'flush' buffered output */
  # define BIO_CTRL_DUP            12/* man - extra stuff for 'duped' BIO */
  # define BIO_CTRL_WPENDING       13/* opt - number of bytes still to write */
  # define BIO_CTRL_SET_CALLBACK   14/* opt - set callback function */
  # define BIO_CTRL_GET_CALLBACK   15/* opt - set callback function */
  
  # define BIO_CTRL_PEEK           29/* BIO_f_buffer special */
  # define BIO_CTRL_SET_FILENAME   30/* BIO_s_file special */
  
  /* dgram BIO stuff */
  # define BIO_CTRL_DGRAM_CONNECT       31/* BIO dgram special */
  # define BIO_CTRL_DGRAM_SET_CONNECTED 32/* allow for an externally connected
                                           * socket to be passed in */
  # define BIO_CTRL_DGRAM_SET_RECV_TIMEOUT 33/* setsockopt, essentially */
  # define BIO_CTRL_DGRAM_GET_RECV_TIMEOUT 34/* getsockopt, essentially */
  # define BIO_CTRL_DGRAM_SET_SEND_TIMEOUT 35/* setsockopt, essentially */
  # define BIO_CTRL_DGRAM_GET_SEND_TIMEOUT 36/* getsockopt, essentially */
  
  # define BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP 37/* flag whether the last */
  # define BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP 38/* I/O operation tiemd out */
  
  /* #ifdef IP_MTU_DISCOVER */
  # define BIO_CTRL_DGRAM_MTU_DISCOVER       39/* set DF bit on egress packets */
  /* #endif */
  
  # define BIO_CTRL_DGRAM_QUERY_MTU          40/* as kernel for current MTU */
  # define BIO_CTRL_DGRAM_GET_FALLBACK_MTU   47
  # define BIO_CTRL_DGRAM_GET_MTU            41/* get cached value for MTU */
  # define BIO_CTRL_DGRAM_SET_MTU            42/* set cached value for MTU.
                                                * want to use this if asking
                                                * the kernel fails */
  
  # define BIO_CTRL_DGRAM_MTU_EXCEEDED       43/* check whether the MTU was
                                                * exceed in the previous write
                                                * operation */
  
  # define BIO_CTRL_DGRAM_GET_PEER           46
  # define BIO_CTRL_DGRAM_SET_PEER           44/* Destination for the data */
  
  # define BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT   45/* Next DTLS handshake timeout
                                                * to adjust socket timeouts */
  # define BIO_CTRL_DGRAM_SET_DONT_FRAG      48
  
  # define BIO_CTRL_DGRAM_GET_MTU_OVERHEAD   49
  
  /* Deliberately outside of OPENSSL_NO_SCTP - used in bss_dgram.c */
  #  define BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE    50
  # ifndef OPENSSL_NO_SCTP
  /* SCTP stuff */
  #  define BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY                51
  #  define BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY               52
  #  define BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD               53
  #  define BIO_CTRL_DGRAM_SCTP_GET_SNDINFO         60
  #  define BIO_CTRL_DGRAM_SCTP_SET_SNDINFO         61
  #  define BIO_CTRL_DGRAM_SCTP_GET_RCVINFO         62
  #  define BIO_CTRL_DGRAM_SCTP_SET_RCVINFO         63
  #  define BIO_CTRL_DGRAM_SCTP_GET_PRINFO                  64
  #  define BIO_CTRL_DGRAM_SCTP_SET_PRINFO                  65
  #  define BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN               70
  # endif
  
  # define BIO_CTRL_DGRAM_SET_PEEK_MODE      71
  
  /* modifiers */
  # define BIO_FP_READ             0x02
  # define BIO_FP_WRITE            0x04
  # define BIO_FP_APPEND           0x08
  # define BIO_FP_TEXT             0x10
  
  # define BIO_FLAGS_READ          0x01
  # define BIO_FLAGS_WRITE         0x02
  # define BIO_FLAGS_IO_SPECIAL    0x04
  # define BIO_FLAGS_RWS (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
  # define BIO_FLAGS_SHOULD_RETRY  0x08
  # ifndef BIO_FLAGS_UPLINK
  /*
   * "UPLINK" flag denotes file descriptors provided by application. It
   * defaults to 0, as most platforms don't require UPLINK interface.
   */
  #  define BIO_FLAGS_UPLINK        0
  # endif
  
  # define BIO_FLAGS_BASE64_NO_NL  0x100
  
  /*
   * This is used with memory BIOs:
   * BIO_FLAGS_MEM_RDONLY means we shouldn't free up or change the data in any way;
   * BIO_FLAGS_NONCLEAR_RST means we shouldn't clear data on reset.
   */
  # define BIO_FLAGS_MEM_RDONLY    0x200
  # define BIO_FLAGS_NONCLEAR_RST  0x400
  
  typedef union bio_addr_st BIO_ADDR;
  typedef struct bio_addrinfo_st BIO_ADDRINFO;
  
  int BIO_get_new_index(void);
  void BIO_set_flags(BIO *b, int flags);
  int BIO_test_flags(const BIO *b, int flags);
  void BIO_clear_flags(BIO *b, int flags);
  
  # define BIO_get_flags(b) BIO_test_flags(b, ~(0x0))
  # define BIO_set_retry_special(b) \
                  BIO_set_flags(b, (BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY))
  # define BIO_set_retry_read(b) \
                  BIO_set_flags(b, (BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY))
  # define BIO_set_retry_write(b) \
                  BIO_set_flags(b, (BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY))
  
  /* These are normally used internally in BIOs */
  # define BIO_clear_retry_flags(b) \
                  BIO_clear_flags(b, (BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))
  # define BIO_get_retry_flags(b) \
                  BIO_test_flags(b, (BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))
  
  /* These should be used by the application to tell why we should retry */
  # define BIO_should_read(a)              BIO_test_flags(a, BIO_FLAGS_READ)
  # define BIO_should_write(a)             BIO_test_flags(a, BIO_FLAGS_WRITE)
  # define BIO_should_io_special(a)        BIO_test_flags(a, BIO_FLAGS_IO_SPECIAL)
  # define BIO_retry_type(a)               BIO_test_flags(a, BIO_FLAGS_RWS)
  # define BIO_should_retry(a)             BIO_test_flags(a, BIO_FLAGS_SHOULD_RETRY)
  
  /*
   * The next three are used in conjunction with the BIO_should_io_special()
   * condition.  After this returns true, BIO *BIO_get_retry_BIO(BIO *bio, int
   * *reason); will walk the BIO stack and return the 'reason' for the special
   * and the offending BIO. Given a BIO, BIO_get_retry_reason(bio) will return
   * the code.
   */
  /*
   * Returned from the SSL bio when the certificate retrieval code had an error
   */
  # define BIO_RR_SSL_X509_LOOKUP          0x01
  /* Returned from the connect BIO when a connect would have blocked */
  # define BIO_RR_CONNECT                  0x02
  /* Returned from the accept BIO when an accept would have blocked */
  # define BIO_RR_ACCEPT                   0x03
  
  /* These are passed by the BIO callback */
  # define BIO_CB_FREE     0x01
  # define BIO_CB_READ     0x02
  # define BIO_CB_WRITE    0x03
  # define BIO_CB_PUTS     0x04
  # define BIO_CB_GETS     0x05
  # define BIO_CB_CTRL     0x06
  
  /*
   * The callback is called before and after the underling operation, The
   * BIO_CB_RETURN flag indicates if it is after the call
   */
  # define BIO_CB_RETURN   0x80
  # define BIO_CB_return(a) ((a)|BIO_CB_RETURN)
  # define BIO_cb_pre(a)   (!((a)&BIO_CB_RETURN))
  # define BIO_cb_post(a)  ((a)&BIO_CB_RETURN)
  
  typedef long (*BIO_callback_fn)(BIO *b, int oper, const char *argp, int argi,
                                  long argl, long ret);
  typedef long (*BIO_callback_fn_ex)(BIO *b, int oper, const char *argp,
                                     size_t len, int argi,
                                     long argl, int ret, size_t *processed);
  BIO_callback_fn BIO_get_callback(const BIO *b);
  void BIO_set_callback(BIO *b, BIO_callback_fn callback);
  
  BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b);
  void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex callback);
  
  char *BIO_get_callback_arg(const BIO *b);
  void BIO_set_callback_arg(BIO *b, char *arg);
  
  typedef struct bio_method_st BIO_METHOD;
  
  const char *BIO_method_name(const BIO *b);
  int BIO_method_type(const BIO *b);
  
  typedef int BIO_info_cb(BIO *, int, int);
  typedef BIO_info_cb bio_info_cb;  /* backward compatibility */
  
  DEFINE_STACK_OF(BIO)
  
  /* Prefix and suffix callback in ASN1 BIO */
  typedef int asn1_ps_func (BIO *b, unsigned char **pbuf, int *plen,
                            void *parg);
  
  # ifndef OPENSSL_NO_SCTP
  /* SCTP parameter structs */
  struct bio_dgram_sctp_sndinfo {
      uint16_t snd_sid;
      uint16_t snd_flags;
      uint32_t snd_ppid;
      uint32_t snd_context;
  };
  
  struct bio_dgram_sctp_rcvinfo {
      uint16_t rcv_sid;
      uint16_t rcv_ssn;
      uint16_t rcv_flags;
      uint32_t rcv_ppid;
      uint32_t rcv_tsn;
      uint32_t rcv_cumtsn;
      uint32_t rcv_context;
  };
  
  struct bio_dgram_sctp_prinfo {
      uint16_t pr_policy;
      uint32_t pr_value;
  };
  # endif
  
  /*
   * #define BIO_CONN_get_param_hostname BIO_ctrl
   */
  
  # define BIO_C_SET_CONNECT                       100
  # define BIO_C_DO_STATE_MACHINE                  101
  # define BIO_C_SET_NBIO                          102
  /* # define BIO_C_SET_PROXY_PARAM                   103 */
  # define BIO_C_SET_FD                            104
  # define BIO_C_GET_FD                            105
  # define BIO_C_SET_FILE_PTR                      106
  # define BIO_C_GET_FILE_PTR                      107
  # define BIO_C_SET_FILENAME                      108
  # define BIO_C_SET_SSL                           109
  # define BIO_C_GET_SSL                           110
  # define BIO_C_SET_MD                            111
  # define BIO_C_GET_MD                            112
  # define BIO_C_GET_CIPHER_STATUS                 113
  # define BIO_C_SET_BUF_MEM                       114
  # define BIO_C_GET_BUF_MEM_PTR                   115
  # define BIO_C_GET_BUFF_NUM_LINES                116
  # define BIO_C_SET_BUFF_SIZE                     117
  # define BIO_C_SET_ACCEPT                        118
  # define BIO_C_SSL_MODE                          119
  # define BIO_C_GET_MD_CTX                        120
  /* # define BIO_C_GET_PROXY_PARAM                   121 */
  # define BIO_C_SET_BUFF_READ_DATA                122/* data to read first */
  # define BIO_C_GET_CONNECT                       123
  # define BIO_C_GET_ACCEPT                        124
  # define BIO_C_SET_SSL_RENEGOTIATE_BYTES         125
  # define BIO_C_GET_SSL_NUM_RENEGOTIATES          126
  # define BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT       127
  # define BIO_C_FILE_SEEK                         128
  # define BIO_C_GET_CIPHER_CTX                    129
  # define BIO_C_SET_BUF_MEM_EOF_RETURN            130/* return end of input
                                                       * value */
  # define BIO_C_SET_BIND_MODE                     131
  # define BIO_C_GET_BIND_MODE                     132
  # define BIO_C_FILE_TELL                         133
  # define BIO_C_GET_SOCKS                         134
  # define BIO_C_SET_SOCKS                         135
  
  # define BIO_C_SET_WRITE_BUF_SIZE                136/* for BIO_s_bio */
  # define BIO_C_GET_WRITE_BUF_SIZE                137
  # define BIO_C_MAKE_BIO_PAIR                     138
  # define BIO_C_DESTROY_BIO_PAIR                  139
  # define BIO_C_GET_WRITE_GUARANTEE               140
  # define BIO_C_GET_READ_REQUEST                  141
  # define BIO_C_SHUTDOWN_WR                       142
  # define BIO_C_NREAD0                            143
  # define BIO_C_NREAD                             144
  # define BIO_C_NWRITE0                           145
  # define BIO_C_NWRITE                            146
  # define BIO_C_RESET_READ_REQUEST                147
  # define BIO_C_SET_MD_CTX                        148
  
  # define BIO_C_SET_PREFIX                        149
  # define BIO_C_GET_PREFIX                        150
  # define BIO_C_SET_SUFFIX                        151
  # define BIO_C_GET_SUFFIX                        152
  
  # define BIO_C_SET_EX_ARG                        153
  # define BIO_C_GET_EX_ARG                        154
  
  # define BIO_C_SET_CONNECT_MODE                  155
  
  # define BIO_set_app_data(s,arg)         BIO_set_ex_data(s,0,arg)
  # define BIO_get_app_data(s)             BIO_get_ex_data(s,0)
  
  # define BIO_set_nbio(b,n)             BIO_ctrl(b,BIO_C_SET_NBIO,(n),NULL)
  
  # ifndef OPENSSL_NO_SOCK
  /* IP families we support, for BIO_s_connect() and BIO_s_accept() */
  /* Note: the underlying operating system may not support some of them */
  #  define BIO_FAMILY_IPV4                         4
  #  define BIO_FAMILY_IPV6                         6
  #  define BIO_FAMILY_IPANY                        256
  
  /* BIO_s_connect() */
  #  define BIO_set_conn_hostname(b,name) BIO_ctrl(b,BIO_C_SET_CONNECT,0, \
                                                   (char *)(name))
  #  define BIO_set_conn_port(b,port)     BIO_ctrl(b,BIO_C_SET_CONNECT,1, \
                                                   (char *)(port))
  #  define BIO_set_conn_address(b,addr)  BIO_ctrl(b,BIO_C_SET_CONNECT,2, \
                                                   (char *)(addr))
  #  define BIO_set_conn_ip_family(b,f)   BIO_int_ctrl(b,BIO_C_SET_CONNECT,3,f)
  #  define BIO_get_conn_hostname(b)      ((const char *)BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,0))
  #  define BIO_get_conn_port(b)          ((const char *)BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,1))
  #  define BIO_get_conn_address(b)       ((const BIO_ADDR *)BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,2))
  #  define BIO_get_conn_ip_family(b)     BIO_ctrl(b,BIO_C_GET_CONNECT,3,NULL)
  #  define BIO_set_conn_mode(b,n)        BIO_ctrl(b,BIO_C_SET_CONNECT_MODE,(n),NULL)
  
  /* BIO_s_accept() */
  #  define BIO_set_accept_name(b,name)   BIO_ctrl(b,BIO_C_SET_ACCEPT,0, \
                                                   (char *)(name))
  #  define BIO_set_accept_port(b,port)   BIO_ctrl(b,BIO_C_SET_ACCEPT,1, \
                                                   (char *)(port))
  #  define BIO_get_accept_name(b)        ((const char *)BIO_ptr_ctrl(b,BIO_C_GET_ACCEPT,0))
  #  define BIO_get_accept_port(b)        ((const char *)BIO_ptr_ctrl(b,BIO_C_GET_ACCEPT,1))
  #  define BIO_get_peer_name(b)          ((const char *)BIO_ptr_ctrl(b,BIO_C_GET_ACCEPT,2))
  #  define BIO_get_peer_port(b)          ((const char *)BIO_ptr_ctrl(b,BIO_C_GET_ACCEPT,3))
  /* #define BIO_set_nbio(b,n)    BIO_ctrl(b,BIO_C_SET_NBIO,(n),NULL) */
  #  define BIO_set_nbio_accept(b,n)      BIO_ctrl(b,BIO_C_SET_ACCEPT,2,(n)?(void *)"a":NULL)
  #  define BIO_set_accept_bios(b,bio)    BIO_ctrl(b,BIO_C_SET_ACCEPT,3, \
                                                   (char *)(bio))
  #  define BIO_set_accept_ip_family(b,f) BIO_int_ctrl(b,BIO_C_SET_ACCEPT,4,f)
  #  define BIO_get_accept_ip_family(b)   BIO_ctrl(b,BIO_C_GET_ACCEPT,4,NULL)
  
  /* Aliases kept for backward compatibility */
  #  define BIO_BIND_NORMAL                 0
  #  define BIO_BIND_REUSEADDR              BIO_SOCK_REUSEADDR
  #  define BIO_BIND_REUSEADDR_IF_UNUSED    BIO_SOCK_REUSEADDR
  #  define BIO_set_bind_mode(b,mode) BIO_ctrl(b,BIO_C_SET_BIND_MODE,mode,NULL)
  #  define BIO_get_bind_mode(b)    BIO_ctrl(b,BIO_C_GET_BIND_MODE,0,NULL)
  
  /* BIO_s_accept() and BIO_s_connect() */
  #  define BIO_do_connect(b)       BIO_do_handshake(b)
  #  define BIO_do_accept(b)        BIO_do_handshake(b)
  # endif /* OPENSSL_NO_SOCK */
  
  # define BIO_do_handshake(b)     BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL)
  
  /* BIO_s_datagram(), BIO_s_fd(), BIO_s_socket(), BIO_s_accept() and BIO_s_connect() */
  # define BIO_set_fd(b,fd,c)      BIO_int_ctrl(b,BIO_C_SET_FD,c,fd)
  # define BIO_get_fd(b,c)         BIO_ctrl(b,BIO_C_GET_FD,0,(char *)(c))
  
  /* BIO_s_file() */
  # define BIO_set_fp(b,fp,c)      BIO_ctrl(b,BIO_C_SET_FILE_PTR,c,(char *)(fp))
  # define BIO_get_fp(b,fpp)       BIO_ctrl(b,BIO_C_GET_FILE_PTR,0,(char *)(fpp))
  
  /* BIO_s_fd() and BIO_s_file() */
  # define BIO_seek(b,ofs) (int)BIO_ctrl(b,BIO_C_FILE_SEEK,ofs,NULL)
  # define BIO_tell(b)     (int)BIO_ctrl(b,BIO_C_FILE_TELL,0,NULL)
  
  /*
   * name is cast to lose const, but might be better to route through a
   * function so we can do it safely
   */
  # ifdef CONST_STRICT
  /*
   * If you are wondering why this isn't defined, its because CONST_STRICT is
   * purely a compile-time kludge to allow const to be checked.
   */
  int BIO_read_filename(BIO *b, const char *name);
  # else
  #  define BIO_read_filename(b,name) (int)BIO_ctrl(b,BIO_C_SET_FILENAME, \
                  BIO_CLOSE|BIO_FP_READ,(char *)(name))
  # endif
  # define BIO_write_filename(b,name) (int)BIO_ctrl(b,BIO_C_SET_FILENAME, \
                  BIO_CLOSE|BIO_FP_WRITE,name)
  # define BIO_append_filename(b,name) (int)BIO_ctrl(b,BIO_C_SET_FILENAME, \
                  BIO_CLOSE|BIO_FP_APPEND,name)
  # define BIO_rw_filename(b,name) (int)BIO_ctrl(b,BIO_C_SET_FILENAME, \
                  BIO_CLOSE|BIO_FP_READ|BIO_FP_WRITE,name)
  
  /*
   * WARNING WARNING, this ups the reference count on the read bio of the SSL
   * structure.  This is because the ssl read BIO is now pointed to by the
   * next_bio field in the bio.  So when you free the BIO, make sure you are
   * doing a BIO_free_all() to catch the underlying BIO.
   */
  # define BIO_set_ssl(b,ssl,c)    BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)(ssl))
  # define BIO_get_ssl(b,sslp)     BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)(sslp))
  # define BIO_set_ssl_mode(b,client)      BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL)
  # define BIO_set_ssl_renegotiate_bytes(b,num) \
          BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL)
  # define BIO_get_num_renegotiates(b) \
          BIO_ctrl(b,BIO_C_GET_SSL_NUM_RENEGOTIATES,0,NULL)
  # define BIO_set_ssl_renegotiate_timeout(b,seconds) \
          BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL)
  
  /* defined in evp.h */
  /* #define BIO_set_md(b,md)     BIO_ctrl(b,BIO_C_SET_MD,1,(char *)(md)) */
  
  # define BIO_get_mem_data(b,pp)  BIO_ctrl(b,BIO_CTRL_INFO,0,(char *)(pp))
  # define BIO_set_mem_buf(b,bm,c) BIO_ctrl(b,BIO_C_SET_BUF_MEM,c,(char *)(bm))
  # define BIO_get_mem_ptr(b,pp)   BIO_ctrl(b,BIO_C_GET_BUF_MEM_PTR,0, \
                                            (char *)(pp))
  # define BIO_set_mem_eof_return(b,v) \
                                  BIO_ctrl(b,BIO_C_SET_BUF_MEM_EOF_RETURN,v,NULL)
  
  /* For the BIO_f_buffer() type */
  # define BIO_get_buffer_num_lines(b)     BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
  # define BIO_set_buffer_size(b,size)     BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
  # define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
  # define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
  # define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
  
  /* Don't use the next one unless you know what you are doing :-) */
  # define BIO_dup_state(b,ret)    BIO_ctrl(b,BIO_CTRL_DUP,0,(char *)(ret))
  
  # define BIO_reset(b)            (int)BIO_ctrl(b,BIO_CTRL_RESET,0,NULL)
  # define BIO_eof(b)              (int)BIO_ctrl(b,BIO_CTRL_EOF,0,NULL)
  # define BIO_set_close(b,c)      (int)BIO_ctrl(b,BIO_CTRL_SET_CLOSE,(c),NULL)
  # define BIO_get_close(b)        (int)BIO_ctrl(b,BIO_CTRL_GET_CLOSE,0,NULL)
  # define BIO_pending(b)          (int)BIO_ctrl(b,BIO_CTRL_PENDING,0,NULL)
  # define BIO_wpending(b)         (int)BIO_ctrl(b,BIO_CTRL_WPENDING,0,NULL)
  /* ...pending macros have inappropriate return type */
  size_t BIO_ctrl_pending(BIO *b);
  size_t BIO_ctrl_wpending(BIO *b);
  # define BIO_flush(b)            (int)BIO_ctrl(b,BIO_CTRL_FLUSH,0,NULL)
  # define BIO_get_info_callback(b,cbp) (int)BIO_ctrl(b,BIO_CTRL_GET_CALLBACK,0, \
                                                     cbp)
  # define BIO_set_info_callback(b,cb) (int)BIO_callback_ctrl(b,BIO_CTRL_SET_CALLBACK,cb)
  
  /* For the BIO_f_buffer() type */
  # define BIO_buffer_get_num_lines(b) BIO_ctrl(b,BIO_CTRL_GET,0,NULL)
  # define BIO_buffer_peek(b,s,l) BIO_ctrl(b,BIO_CTRL_PEEK,(l),(s))
  
  /* For BIO_s_bio() */
  # define BIO_set_write_buf_size(b,size) (int)BIO_ctrl(b,BIO_C_SET_WRITE_BUF_SIZE,size,NULL)
  # define BIO_get_write_buf_size(b,size) (size_t)BIO_ctrl(b,BIO_C_GET_WRITE_BUF_SIZE,size,NULL)
  # define BIO_make_bio_pair(b1,b2)   (int)BIO_ctrl(b1,BIO_C_MAKE_BIO_PAIR,0,b2)
  # define BIO_destroy_bio_pair(b)    (int)BIO_ctrl(b,BIO_C_DESTROY_BIO_PAIR,0,NULL)
  # define BIO_shutdown_wr(b) (int)BIO_ctrl(b, BIO_C_SHUTDOWN_WR, 0, NULL)
  /* macros with inappropriate type -- but ...pending macros use int too: */
  # define BIO_get_write_guarantee(b) (int)BIO_ctrl(b,BIO_C_GET_WRITE_GUARANTEE,0,NULL)
  # define BIO_get_read_request(b)    (int)BIO_ctrl(b,BIO_C_GET_READ_REQUEST,0,NULL)
  size_t BIO_ctrl_get_write_guarantee(BIO *b);
  size_t BIO_ctrl_get_read_request(BIO *b);
  int BIO_ctrl_reset_read_request(BIO *b);
  
  /* ctrl macros for dgram */
  # define BIO_ctrl_dgram_connect(b,peer)  \
                       (int)BIO_ctrl(b,BIO_CTRL_DGRAM_CONNECT,0, (char *)(peer))
  # define BIO_ctrl_set_connected(b,peer) \
           (int)BIO_ctrl(b, BIO_CTRL_DGRAM_SET_CONNECTED, 0, (char *)(peer))
  # define BIO_dgram_recv_timedout(b) \
           (int)BIO_ctrl(b, BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP, 0, NULL)
  # define BIO_dgram_send_timedout(b) \
           (int)BIO_ctrl(b, BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP, 0, NULL)
  # define BIO_dgram_get_peer(b,peer) \
           (int)BIO_ctrl(b, BIO_CTRL_DGRAM_GET_PEER, 0, (char *)(peer))
  # define BIO_dgram_set_peer(b,peer) \
           (int)BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, (char *)(peer))
  # define BIO_dgram_get_mtu_overhead(b) \
           (unsigned int)BIO_ctrl((b), BIO_CTRL_DGRAM_GET_MTU_OVERHEAD, 0, NULL)
  
  #define BIO_get_ex_new_index(l, p, newf, dupf, freef) \
      CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_BIO, l, p, newf, dupf, freef)
  int BIO_set_ex_data(BIO *bio, int idx, void *data);
  void *BIO_get_ex_data(BIO *bio, int idx);
  uint64_t BIO_number_read(BIO *bio);
  uint64_t BIO_number_written(BIO *bio);
  
  /* For BIO_f_asn1() */
  int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix,
                          asn1_ps_func *prefix_free);
  int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix,
                          asn1_ps_func **pprefix_free);
  int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix,
                          asn1_ps_func *suffix_free);
  int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix,
                          asn1_ps_func **psuffix_free);
  
  const BIO_METHOD *BIO_s_file(void);
  BIO *BIO_new_file(const char *filename, const char *mode);
  # ifndef OPENSSL_NO_STDIO
  BIO *BIO_new_fp(FILE *stream, int close_flag);
  # endif
  BIO *BIO_new(const BIO_METHOD *type);
  int BIO_free(BIO *a);
  void BIO_set_data(BIO *a, void *ptr);
  void *BIO_get_data(BIO *a);
  void BIO_set_init(BIO *a, int init);
  int BIO_get_init(BIO *a);
  void BIO_set_shutdown(BIO *a, int shut);
  int BIO_get_shutdown(BIO *a);
  void BIO_vfree(BIO *a);
  int BIO_up_ref(BIO *a);
  int BIO_read(BIO *b, void *data, int dlen);
  int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes);
  int BIO_gets(BIO *bp, char *buf, int size);
  int BIO_write(BIO *b, const void *data, int dlen);
  int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written);
  int BIO_puts(BIO *bp, const char *buf);
  int BIO_indent(BIO *b, int indent, int max);
  long BIO_ctrl(BIO *bp, int cmd, long larg, void *parg);
  long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
  void *BIO_ptr_ctrl(BIO *bp, int cmd, long larg);
  long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg);
  BIO *BIO_push(BIO *b, BIO *append);
  BIO *BIO_pop(BIO *b);
  void BIO_free_all(BIO *a);
  BIO *BIO_find_type(BIO *b, int bio_type);
  BIO *BIO_next(BIO *b);
  void BIO_set_next(BIO *b, BIO *next);
  BIO *BIO_get_retry_BIO(BIO *bio, int *reason);
  int BIO_get_retry_reason(BIO *bio);
  void BIO_set_retry_reason(BIO *bio, int reason);
  BIO *BIO_dup_chain(BIO *in);
  
  int BIO_nread0(BIO *bio, char **buf);
  int BIO_nread(BIO *bio, char **buf, int num);
  int BIO_nwrite0(BIO *bio, char **buf);
  int BIO_nwrite(BIO *bio, char **buf, int num);
  
  long BIO_debug_callback(BIO *bio, int cmd, const char *argp, int argi,
                          long argl, long ret);
  
  const BIO_METHOD *BIO_s_mem(void);
  const BIO_METHOD *BIO_s_secmem(void);
  BIO *BIO_new_mem_buf(const void *buf, int len);
  # ifndef OPENSSL_NO_SOCK
  const BIO_METHOD *BIO_s_socket(void);
  const BIO_METHOD *BIO_s_connect(void);
  const BIO_METHOD *BIO_s_accept(void);
  # endif
  const BIO_METHOD *BIO_s_fd(void);
  const BIO_METHOD *BIO_s_log(void);
  const BIO_METHOD *BIO_s_bio(void);
  const BIO_METHOD *BIO_s_null(void);
  const BIO_METHOD *BIO_f_null(void);
  const BIO_METHOD *BIO_f_buffer(void);
  const BIO_METHOD *BIO_f_linebuffer(void);
  const BIO_METHOD *BIO_f_nbio_test(void);
  # ifndef OPENSSL_NO_DGRAM
  const BIO_METHOD *BIO_s_datagram(void);
  int BIO_dgram_non_fatal_error(int error);
  BIO *BIO_new_dgram(int fd, int close_flag);
  #  ifndef OPENSSL_NO_SCTP
  const BIO_METHOD *BIO_s_datagram_sctp(void);
  BIO *BIO_new_dgram_sctp(int fd, int close_flag);
  int BIO_dgram_is_sctp(BIO *bio);
  int BIO_dgram_sctp_notification_cb(BIO *b,
                                     void (*handle_notifications) (BIO *bio,
                                                                   void *context,
                                                                   void *buf),
                                     void *context);
  int BIO_dgram_sctp_wait_for_dry(BIO *b);
  int BIO_dgram_sctp_msg_waiting(BIO *b);
  #  endif
  # endif
  
  # ifndef OPENSSL_NO_SOCK
  int BIO_sock_should_retry(int i);
  int BIO_sock_non_fatal_error(int error);
  # endif
  
  int BIO_fd_should_retry(int i);
  int BIO_fd_non_fatal_error(int error);
  int BIO_dump_cb(int (*cb) (const void *data, size_t len, void *u),
                  void *u, const char *s, int len);
  int BIO_dump_indent_cb(int (*cb) (const void *data, size_t len, void *u),
                         void *u, const char *s, int len, int indent);
  int BIO_dump(BIO *b, const char *bytes, int len);
  int BIO_dump_indent(BIO *b, const char *bytes, int len, int indent);
  # ifndef OPENSSL_NO_STDIO
  int BIO_dump_fp(FILE *fp, const char *s, int len);
  int BIO_dump_indent_fp(FILE *fp, const char *s, int len, int indent);
  # endif
  int BIO_hex_string(BIO *out, int indent, int width, unsigned char *data,
                     int datalen);
  
  # ifndef OPENSSL_NO_SOCK
  BIO_ADDR *BIO_ADDR_new(void);
  int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
                       const void *where, size_t wherelen, unsigned short port);
  void BIO_ADDR_free(BIO_ADDR *);
  void BIO_ADDR_clear(BIO_ADDR *ap);
  int BIO_ADDR_family(const BIO_ADDR *ap);
  int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l);
  unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap);
  char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric);
  char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric);
  char *BIO_ADDR_path_string(const BIO_ADDR *ap);
  
  const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai);
  int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai);
  int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai);
  int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai);
  const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai);
  void BIO_ADDRINFO_free(BIO_ADDRINFO *bai);
  
  enum BIO_hostserv_priorities {
      BIO_PARSE_PRIO_HOST, BIO_PARSE_PRIO_SERV
  };
  int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
                         enum BIO_hostserv_priorities hostserv_prio);
  enum BIO_lookup_type {
      BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER
  };
  int BIO_lookup(const char *host, const char *service,
                 enum BIO_lookup_type lookup_type,
                 int family, int socktype, BIO_ADDRINFO **res);
  int BIO_lookup_ex(const char *host, const char *service,
                    int lookup_type, int family, int socktype, int protocol,
                    BIO_ADDRINFO **res);
  int BIO_sock_error(int sock);
  int BIO_socket_ioctl(int fd, long type, void *arg);
  int BIO_socket_nbio(int fd, int mode);
  int BIO_sock_init(void);
  # if OPENSSL_API_COMPAT < 0x10100000L
  #  define BIO_sock_cleanup() while(0) continue
  # endif
  int BIO_set_tcp_ndelay(int sock, int turn_on);
  
  DEPRECATEDIN_1_1_0(struct hostent *BIO_gethostbyname(const char *name))
  DEPRECATEDIN_1_1_0(int BIO_get_port(const char *str, unsigned short *port_ptr))
  DEPRECATEDIN_1_1_0(int BIO_get_host_ip(const char *str, unsigned char *ip))
  DEPRECATEDIN_1_1_0(int BIO_get_accept_socket(char *host_port, int mode))
  DEPRECATEDIN_1_1_0(int BIO_accept(int sock, char **ip_port))
  
  union BIO_sock_info_u {
      BIO_ADDR *addr;
  };
  enum BIO_sock_info_type {
      BIO_SOCK_INFO_ADDRESS
  };
  int BIO_sock_info(int sock,
                    enum BIO_sock_info_type type, union BIO_sock_info_u *info);
  
  #  define BIO_SOCK_REUSEADDR    0x01
  #  define BIO_SOCK_V6_ONLY      0x02
  #  define BIO_SOCK_KEEPALIVE    0x04
  #  define BIO_SOCK_NONBLOCK     0x08
  #  define BIO_SOCK_NODELAY      0x10
  
  int BIO_socket(int domain, int socktype, int protocol, int options);
  int BIO_connect(int sock, const BIO_ADDR *addr, int options);
  int BIO_bind(int sock, const BIO_ADDR *addr, int options);
  int BIO_listen(int sock, const BIO_ADDR *addr, int options);
  int BIO_accept_ex(int accept_sock, BIO_ADDR *addr, int options);
  int BIO_closesocket(int sock);
  
  BIO *BIO_new_socket(int sock, int close_flag);
  BIO *BIO_new_connect(const char *host_port);
  BIO *BIO_new_accept(const char *host_port);
  # endif /* OPENSSL_NO_SOCK*/
  
  BIO *BIO_new_fd(int fd, int close_flag);
  
  int BIO_new_bio_pair(BIO **bio1, size_t writebuf1,
                       BIO **bio2, size_t writebuf2);
  /*
   * If successful, returns 1 and in *bio1, *bio2 two BIO pair endpoints.
   * Otherwise returns 0 and sets *bio1 and *bio2 to NULL. Size 0 uses default
   * value.
   */
  
  void BIO_copy_next_retry(BIO *b);
  
  /*
   * long BIO_ghbn_ctrl(int cmd,int iarg,char *parg);
   */
  
  # define ossl_bio__attr__(x)
  # if defined(__GNUC__) && defined(__STDC_VERSION__) \
      && !defined(__APPLE__)
      /*
       * Because we support the 'z' modifier, which made its appearance in C99,
       * we can't use __attribute__ with pre C99 dialects.
       */
  #  if __STDC_VERSION__ >= 199901L
  #   undef ossl_bio__attr__
  #   define ossl_bio__attr__ __attribute__
  #   if __GNUC__*10 + __GNUC_MINOR__ >= 44
  #    define ossl_bio__printf__ __gnu_printf__
  #   else
  #    define ossl_bio__printf__ __printf__
  #   endif
  #  endif
  # endif
  int BIO_printf(BIO *bio, const char *format, ...)
  ossl_bio__attr__((__format__(ossl_bio__printf__, 2, 3)));
  int BIO_vprintf(BIO *bio, const char *format, va_list args)
  ossl_bio__attr__((__format__(ossl_bio__printf__, 2, 0)));
  int BIO_snprintf(char *buf, size_t n, const char *format, ...)
  ossl_bio__attr__((__format__(ossl_bio__printf__, 3, 4)));
  int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
  ossl_bio__attr__((__format__(ossl_bio__printf__, 3, 0)));
  # undef ossl_bio__attr__
  # undef ossl_bio__printf__
  
  
  BIO_METHOD *BIO_meth_new(int type, const char *name);
  void BIO_meth_free(BIO_METHOD *biom);
  int (*BIO_meth_get_write(const BIO_METHOD *biom)) (BIO *, const char *, int);
  int (*BIO_meth_get_write_ex(const BIO_METHOD *biom)) (BIO *, const char *, size_t,
                                                  size_t *);
  int BIO_meth_set_write(BIO_METHOD *biom,
                         int (*write) (BIO *, const char *, int));
  int BIO_meth_set_write_ex(BIO_METHOD *biom,
                         int (*bwrite) (BIO *, const char *, size_t, size_t *));
  int (*BIO_meth_get_read(const BIO_METHOD *biom)) (BIO *, char *, int);
  int (*BIO_meth_get_read_ex(const BIO_METHOD *biom)) (BIO *, char *, size_t, size_t *);
  int BIO_meth_set_read(BIO_METHOD *biom,
                        int (*read) (BIO *, char *, int));
  int BIO_meth_set_read_ex(BIO_METHOD *biom,
                           int (*bread) (BIO *, char *, size_t, size_t *));
  int (*BIO_meth_get_puts(const BIO_METHOD *biom)) (BIO *, const char *);
  int BIO_meth_set_puts(BIO_METHOD *biom,
                        int (*puts) (BIO *, const char *));
  int (*BIO_meth_get_gets(const BIO_METHOD *biom)) (BIO *, char *, int);
  int BIO_meth_set_gets(BIO_METHOD *biom,
                        int (*gets) (BIO *, char *, int));
  long (*BIO_meth_get_ctrl(const BIO_METHOD *biom)) (BIO *, int, long, void *);
  int BIO_meth_set_ctrl(BIO_METHOD *biom,
                        long (*ctrl) (BIO *, int, long, void *));
  int (*BIO_meth_get_create(const BIO_METHOD *bion)) (BIO *);
  int BIO_meth_set_create(BIO_METHOD *biom, int (*create) (BIO *));
  int (*BIO_meth_get_destroy(const BIO_METHOD *biom)) (BIO *);
  int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy) (BIO *));
  long (*BIO_meth_get_callback_ctrl(const BIO_METHOD *biom))
                                   (BIO *, int, BIO_info_cb *);
  int BIO_meth_set_callback_ctrl(BIO_METHOD *biom,
                                 long (*callback_ctrl) (BIO *, int,
                                                        BIO_info_cb *));
  
  # ifdef  __cplusplus
  }
  # endif
  #endif
  