=pod =head1 NAME SSL_accept - wait for a TLS/SSL client to initiate a TLS/SSL handshake =head1 SYNOPSIS #include int SSL_accept(SSL *ssl); =head1 DESCRIPTION SSL_accept() waits for a TLS/SSL client to initiate the TLS/SSL handshake. The communication channel must already have been set and assigned to the B by setting an underlying B. =head1 NOTES The behaviour of SSL_accept() depends on the underlying BIO. If the underlying BIO is B, SSL_accept() will only return once the handshake has been finished or an error occurred. If the underlying BIO is B, SSL_accept() will also return when the underlying BIO could not satisfy the needs of SSL_accept() to continue the handshake, indicating the problem by the return value -1. In this case a call to SSL_get_error() with the return value of SSL_accept() will yield B or B. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_accept(). The action depends on the underlying BIO. When using a non-blocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue. =head1 RETURN VALUES The following return values can occur: =over 4 =item Z<>0 The TLS/SSL handshake was not successful but was shut down controlled and by the specifications of the TLS/SSL protocol. Call SSL_get_error() with the return value B to find out the reason. =item Z<>1 The TLS/SSL handshake was successfully completed, a TLS/SSL connection has been established. =item E0 The TLS/SSL handshake was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur of action is need to continue the operation for non-blocking BIOs. Call SSL_get_error() with the return value B to find out the reason. =back =head1 SEE ALSO L, L, L, L, L, L, L, L =head1 COPYRIGHT Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the Apache License 2.0 (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 L. =cut