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Title "SSL_ACCEPT 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_accept - wait for a TLS/SSL client to initiate a TLS/SSL handshake Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& int SSL_accept(SSL *ssl); .Ve Header "DESCRIPTION" \fBSSL_accept() waits for a \s-1TLS/SSL\s0 client to initiate the \s-1TLS/SSL\s0 handshake. The communication channel must already have been set and assigned to the \fBssl by setting an underlying \s-1BIO\s0. Header "NOTES" The behaviour of SSL_accept() depends on the underlying \s-1BIO.\s0

If the underlying \s-1BIO\s0 is blocking, SSL_accept() will only return once the handshake has been finished or an error occurred.

If the underlying \s-1BIO\s0 is nonblocking, SSL_accept() will also return when the underlying \s-1BIO\s0 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 \s-1SSL_ERROR_WANT_READ\s0 or \fB\s-1SSL_ERROR_WANT_WRITE\s0. 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 \s-1BIO.\s0 When using a nonblocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering \s-1BIO,\s0 like a \s-1BIO\s0 pair, data must be written into or retrieved out of the \s-1BIO\s0 before being able to continue.

Header "RETURN VALUES" The following return values can occur: The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and by the specifications of the \s-1TLS/SSL\s0 protocol. Call SSL_get_error() with the return value ret to find out the reason. Item "1" The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been established. Item "<0" The \s-1TLS/SSL\s0 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 if action is needed to continue the operation for nonblocking BIOs. Call SSL_get_error() with the return value ret to find out the reason. Header "SEE ALSO" \fBSSL_get_error\|(3), SSL_connect\|(3), \fBSSL_shutdown\|(3), ssl\|(7), bio\|(7), \fBSSL_set_connect_state\|(3), \fBSSL_do_handshake\|(3), \fBSSL_CTX_new\|(3) Header "COPYRIGHT" Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.