5 BIO_socket, BIO_bind, BIO_connect, BIO_listen, BIO_accept_ex, BIO_closesocket - BIO
6 socket communication setup routines
10 #include <openssl/bio.h>
12 int BIO_socket(int domain, int socktype, int protocol, int options);
13 int BIO_bind(int sock, const BIO_ADDR *addr, int options);
14 int BIO_connect(int sock, const BIO_ADDR *addr, int options);
15 int BIO_listen(int sock, const BIO_ADDR *addr, int options);
16 int BIO_accept_ex(int accept_sock, BIO_ADDR *peer, int options);
17 int BIO_closesocket(int sock);
21 BIO_socket() creates a socket in the domain B<domain>, of type
22 B<socktype> and B<protocol>. Socket B<options> are currently unused,
23 but is present for future use.
25 BIO_bind() binds the source address and service to a socket and
26 may be useful before calling BIO_connect(). The options may include
27 B<BIO_SOCK_REUSADDR>, which is described in L</FLAGS> below.
29 BIO_connect() connects B<sock> to the address and service given by
30 B<addr>. Connection B<options> may be zero or any combination of
31 B<BIO_SOCK_KEEPALIVE>, B<BIO_SOCK_NONBLOCK> and B<BIO_SOCK_NODELAY>.
32 The flags are described in L</FLAGS> below.
34 BIO_listen() has B<sock> start listening on the address and service
35 given by B<addr>. Connection B<options> may be zero or any
36 combination of B<BIO_SOCK_KEEPALIVE>, B<BIO_SOCK_NONBLOCK>,
37 B<BIO_SOCK_NODELAY>, B<BIO_SOCK_REUSEADDR> and B<BIO_SOCK_V6_ONLY>.
38 The flags are described in L</FLAGS> below.
40 BIO_accept_ex() waits for an incoming connections on the given
41 socket B<accept_sock>. When it gets a connection, the address and
42 port of the peer gets stored in B<peer> if that one is non-NULL.
43 Accept B<options> may be zero or B<BIO_SOCK_NONBLOCK>, and is applied
44 on the accepted socket. The flags are described in L</FLAGS> below.
46 BIO_closesocket() closes B<sock>.
52 =item BIO_SOCK_KEEPALIVE
54 Enables regular sending of keep-alive messages.
56 =item BIO_SOCK_NONBLOCK
58 Sets the socket to non-blocking mode.
60 =item BIO_SOCK_NODELAY
62 Corresponds to B<TCP_NODELAY>, and disables the Nagle algorithm. With
63 this set, any data will be sent as soon as possible instead of being
64 buffered until there's enough for the socket to send out in one go.
66 =item BIO_SOCK_REUSEADDR
68 Try to reuse the address and port combination for a recently closed
71 =item BIO_SOCK_V6_ONLY
73 When creating an IPv6 socket, make it only listen for IPv6 addresses
74 and not IPv4 addresses mapped to IPv6.
78 These flags are bit flags, so they are to be combined with the
79 C<|> operator, for example:
81 BIO_connect(sock, addr, BIO_SOCK_KEEPALIVE | BIO_SOCK_NONBLOCK);
85 BIO_socket() returns the socket number on success or B<INVALID_SOCKET>
86 (-1) on error. When an error has occurred, the OpenSSL error stack
87 will hold the error data and errno has the system error.
89 BIO_bind(), BIO_connect() and BIO_listen() return 1 on success or 0 on error.
90 When an error has occurred, the OpenSSL error stack will hold the error
91 data and errno has the system error.
93 BIO_accept_ex() returns the accepted socket on success or
94 B<INVALID_SOCKET> (-1) on error. When an error has occurred, the
95 OpenSSL error stack will hold the error data and errno has the system
104 BIO_gethostname(), BIO_get_port(), BIO_get_host_ip(),
105 BIO_get_accept_socket() and BIO_accept() were deprecated in
106 OpenSSL 1.1.0. Use the functions described above instead.
110 Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
112 Licensed under the OpenSSL license (the "License"). You may not use
113 this file except in compliance with the License. You can obtain a copy
114 in the file LICENSE in the source distribution or at
115 L<https://www.openssl.org/source/license.html>.