BIO_get_accept_port man page on DigitalUNIX

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BIO_s_accept(3)						       BIO_s_accept(3)

       BIO_s_accept,	     BIO_set_accept_port,	  BIO_get_accept_port,
       BIO_set_nbio_accept,	 BIO_set_accept_bios,	    BIO_set_bind_mode,
       BIO_get_bind_mode, BIO_do_accept - Accept BIO

	#include <openssl/bio.h>

       BIO_METHOD * BIO_s_accept(
	       void	   );	     #define	   BIO_set_accept_port(b,name)
       BIO_ctrl(b,BIO_C_SET_ACCEPT,0,(char	     *)name)	       #define
       BIO_get_accept_port(b)	  BIO_ptr_ctrl(b,BIO_C_GET_ACCEPT,0)

       BIO *BIO_new_accept(
	       char    *host_port    );	   #define    BIO_set_nbio_accept(b,n)
       BIO_ctrl(b,BIO_C_SET_ACCEPT,1,(n)?"a":NULL)		       #define
       BIO_set_accept_bios(b,bio) BIO_ctrl(b,BIO_C_SET_ACCEPT,2,(char *)bio)

       #define					     BIO_set_bind_mode(b,mode)
       BIO_ctrl(b,BIO_C_SET_BIND_MODE,mode,NULL)		       #define
       BIO_get_bind_mode(b,mode) BIO_ctrl(b,BIO_C_GET_BIND_MODE,0,NULL)

       #define	     BIO_BIND_NORMAL	   0	  #define      BIO_BIND_REUSE‐
       ADDR_IF_UNUSED	 1 #define BIO_BIND_REUSEADDR	      2

       #define BIO_do_accept(b) BIO_do_handshake(b)

       The BIO_s_accept() function returns the accept BIO method.  This	 is  a
       wrapper round the platform's TCP/IP socket accept routines.

       Using  accept  BIOs, TCP/IP connections can be accepted and data trans‐
       ferred using only BIO routines. In this way any platform specific oper‐
       ations are hidden by the BIO abstraction.

       Read  and  write	 operations  on	 an accept BIO will perform I/O on the
       underlying connection. If no connection is established and the port  is
       set up properly then the BIO waits for an incoming connection.

       Accept BIOs support BIO_puts() but not BIO_gets().

       If  the close option is set on an accept BIO then any active connection
       on that chain is shutdown and the socket closed when the BIO is freed.

       Calling BIO_reset() on a accept BIO will close  any  active  connection
       and reset the BIO into a state where it awaits another incoming connec‐

       The BIO_get_fd() and BIO_set_fd() functions can be called  to  retrieve
       or set the accept socket. See BIO_s_fd(3)

       BIO_set_accept_port()  uses the string name to set the accept port. The
       port is represented as a string of the form host:port,  where  host  is
       the interface to use and port is the port. Either or both values can be
       * which is interpreted as meaning any interface or  port	 respectively.
       Port  has  the same syntax as the port specified in BIO_set_conn_port()
       for connect BIOs; it can be a numerical port  string  or	 a  string  to
       lookup using getservbyname() and a string table.

       BIO_new_accept()	 combines  BIO_new()  and BIO_set_accept_port() into a
       single call; it creates a new accept BIO with port host_port.

       BIO_set_nbio_accept() sets the accept  socket  to  blocking  mode  (the
       default) if n is 0 or nonblocking mode if n is 1.

       The  BIO_set_accept_bios()  function can be used to set a chain of BIOs
       which will be duplicated and prepended to the chain  when  an  incoming
       connection is received. This is useful if, for example, a  buffering or
       SSL BIO is required for each connection. The chain of BIOs must not  be
       freed after this call. They will be automatically freed when the accept
       BIO is freed.

       The  BIO_set_bind_mode()	 and  BIO_get_bind_mode()  functions  set  and
       retrieve	 the  current  bind  mode. If BIO_BIND_NORMAL (the default) is
       set, then  another  socket  cannot  be  bound  to  the  same  port.  If
       BIO_BIND_REUSEADDR  is  set,  then  other  sockets can bind to the same
       port. If BIO_BIND_REUSEADDR_IF_UNUSED is set, then an attempt is	 first
       made  to	 use BIO_BIN_NORMAL. If this fails and the port is not in use,
       then a second attempt is made using BIO_BIND_REUSEADDR.

       BIO_do_accept() serves two functions. When it is	 first	called,	 after
       the  accept  BIO	 has  been setup, it will attempt to create the accept
       socket and bind an address  to  it.  Second  and	 subsequent  calls  to
       BIO_do_accept() will await an incoming connection.

       When  an	 accept BIO is at the end of a chain it will await an incoming
       connection before processing I/O calls. When an accept BIO  is  not  at
       then end of a chain it passes I/O calls to the next BIO in the chain.

       When  a	connection  is established a new socket BIO is created for the
       connection and appended to the chain. The chain is now  accept->socket.
       This  effectively means that attempting I/O on an initial accept socket
       will await an incoming connection then perform I/O on it.

       If any additional BIOs have been set  using  the	 BIO_set_accept_bios()
       function	 then  they  are placed between the socket and the accept BIO.
       The chain will be accept->otherbios->socket.

       If a server wishes to process multiple connections (as is normally  the
       case),  then the accept BIO must be made available for further incoming
       connections.  This can be done by waiting for  a	 connection  and  then
	connection = BIO_pop(accept);

       After  this call, connection will contain a BIO for the recently estab‐
       lished connection and accept will be a single BIO again	which  can  be
       used  to await further incoming connections.  If no further connections
       will be accepted, the accept can be freed using	the  BIO_free()	 func‐

       If only a single connection will be processed it is possible to perform
       I/O using the accept BIO. This is often undesirable however because the
       accept  BIO will still accept additional incoming connections. This can
       be resolved by using the BIO_pop() function and freeing up  the	accept
       BIO after the initial connection.


       This  example accepts two connections on port 4444, sends messages down
       each and finally closes both down.
	BIO *abio, *cbio, *cbio2;
	abio = BIO_new_accept("4444");

	/* First call to BIO_accept() sets up accept BIO */
	if(BIO_do_accept(abio) <= 0) {	    fprintf(stderr, "Error setting  up
       accept\n");	ERR_print_errors_fp(stderr); exit(0);

	/* Wait for incoming connection */
	if(BIO_do_accept(abio)	<=  0) {      fprintf(stderr, "Error accepting
       connection\n");	    ERR_print_errors_fp(stderr); exit(0);
	fprintf(stderr, "Connection 1 established\n");
	/* Retrieve BIO for connection */
	cbio = BIO_pop(abio);
	BIO_puts(cbio, "Connection 1: Sending  out  Data  on  initial  connec‐
	fprintf(stderr, "Sent out data on connection 1\n");
	/* Wait for another connection */
	if(BIO_do_accept(abio)	<=  0) {      fprintf(stderr, "Error accepting
       connection\n");	    ERR_print_errors_fp(stderr); exit(0);
	fprintf(stderr, "Connection 2 established\n");
	/* Close accept BIO to refuse further connections */
	cbio2 = BIO_pop(abio);
	BIO_puts(cbio2, "Connection 2: Sending out Data on second\n");
	fprintf(stderr, "Sent out data on connection 2\n");

	BIO_puts(cbio, "Connection 1: Second connection established\n");
	/* Close the two established connections */



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