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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_get_error \- obtain result code for TLS/SSL I/O operation .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& int SSL_get_error(const SSL *ssl, int ret); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fISSL_get_error()\fR returns a result code (suitable for the C \*(L"switch\*(R" statement) for a preceding call to \fISSL_connect()\fR, \fISSL_accept()\fR, \fISSL_do_handshake()\fR, \&\fISSL_read()\fR, \fISSL_peek()\fR, or \fISSL_write()\fR on \fBssl\fR. The value returned by that \s-1TLS/SSL I/O\s0 function must be passed to \fISSL_get_error()\fR in parameter \&\fBret\fR. .PP In addition to \fBssl\fR and \fBret\fR, \fISSL_get_error()\fR inspects the current thread's OpenSSL error queue. Thus, \fISSL_get_error()\fR must be used in the same thread that performed the \s-1TLS/SSL I/O\s0 operation, and no other OpenSSL function calls should appear in between. The current thread's error queue must be empty before the \s-1TLS/SSL I/O\s0 operation is attempted, or \fISSL_get_error()\fR will not work reliably. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The following return values can currently occur: .IP "\s-1SSL_ERROR_NONE\s0" 4 .IX Item "SSL_ERROR_NONE" The \s-1TLS/SSL I/O\s0 operation completed. This result code is returned if and only if \fBret > 0\fR. .IP "\s-1SSL_ERROR_ZERO_RETURN\s0" 4 .IX Item "SSL_ERROR_ZERO_RETURN" The \s-1TLS/SSL\s0 connection has been closed. If the protocol version is \s-1SSL 3.0\s0 or higher, this result code is returned only if a closure alert has occurred in the protocol, i.e. if the connection has been closed cleanly. Note that in this case \fB\s-1SSL_ERROR_ZERO_RETURN\s0\fR does not necessarily indicate that the underlying transport has been closed. .IP "\s-1SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE\s0" 4 .IX Item "SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE" The operation did not complete; the same \s-1TLS/SSL I/O\s0 function should be called again later. If, by then, the underlying \fB\s-1BIO\s0\fR has data available for reading (if the result code is \fB\s-1SSL_ERROR_WANT_READ\s0\fR) or allows writing data (\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR), then some \s-1TLS/SSL\s0 protocol progress will take place, i.e. at least part of an \s-1TLS/SSL\s0 record will be read or written. Note that the retry may again lead to a \fB\s-1SSL_ERROR_WANT_READ\s0\fR or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR condition. There is no fixed upper limit for the number of iterations that may be necessary until progress becomes visible at application protocol level. .Sp For socket \fB\s-1BIO\s0\fRs (e.g. when \fISSL_set_fd()\fR was used), \fIselect()\fR or \&\fIpoll()\fR on the underlying socket can be used to find out when the \&\s-1TLS/SSL I/O\s0 function should be retried. .Sp Caveat: Any \s-1TLS/SSL I/O\s0 function can lead to either of \&\fB\s-1SSL_ERROR_WANT_READ\s0\fR and \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. In particular, \&\fISSL_read()\fR or \fISSL_peek()\fR may want to write data and \fISSL_write()\fR may want to read data. This is mainly because \s-1TLS/SSL\s0 handshakes may occur at any time during the protocol (initiated by either the client or the server); \&\fISSL_read()\fR, \fISSL_peek()\fR, and \fISSL_write()\fR will handle any pending handshakes. .IP "\s-1SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT\s0" 4 .IX Item "SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT" The operation did not complete; the same \s-1TLS/SSL I/O\s0 function should be called again later. The underlying \s-1BIO\s0 was not connected yet to the peer and the call would block in \fIconnect()\fR/\fIaccept()\fR. The \s-1SSL\s0 function should be called again when the connection is established. These messages can only appear with a \fIBIO_s_connect()\fR or \fIBIO_s_accept()\fR \s-1BIO,\s0 respectively. In order to find out, when the connection has been successfully established, on many platforms \fIselect()\fR or \fIpoll()\fR for writing on the socket file descriptor can be used. .IP "\s-1SSL_ERROR_WANT_X509_LOOKUP\s0" 4 .IX Item "SSL_ERROR_WANT_X509_LOOKUP" The operation did not complete because an application callback set by \&\fISSL_CTX_set_client_cert_cb()\fR has asked to be called again. The \s-1TLS/SSL I/O\s0 function should be called again later. Details depend on the application. .IP "\s-1SSL_ERROR_WANT_ASYNC\s0" 4 .IX Item "SSL_ERROR_WANT_ASYNC" The operation did not complete because an asynchronous engine is still processing data. This will only occur if the mode has been set to \s-1SSL_MODE_ASYNC\s0 using \fISSL_CTX_set_mode\fR\|(3) or \fISSL_set_mode\fR\|(3) and an asynchronous capable engine is being used. An application can determine whether the engine has completed its processing using \fIselect()\fR or \fIpoll()\fR on the asynchronous wait file descriptor. This file descriptor is available by calling \&\fISSL_get_all_async_fds\fR\|(3) or \fISSL_get_changed_async_fds\fR\|(3). The \s-1TLS/SSL I/O\s0 function should be called again later. The function \fBmust\fR be called from the same thread that the original call was made from. .IP "\s-1SSL_ERROR_WANT_ASYNC_JOB\s0" 4 .IX Item "SSL_ERROR_WANT_ASYNC_JOB" The asynchronous job could not be started because there were no async jobs available in the pool (see \fIASYNC_init_thread\fR\|(3)). This will only occur if the mode has been set to \s-1SSL_MODE_ASYNC\s0 using \fISSL_CTX_set_mode\fR\|(3) or \&\fISSL_set_mode\fR\|(3) and a maximum limit has been set on the async job pool through a call to \fIASYNC_init_thread\fR\|(3). The application should retry the operation after a currently executing asynchronous operation for the current thread has completed. .IP "\s-1SSL_ERROR_SYSCALL\s0" 4 .IX Item "SSL_ERROR_SYSCALL" Some non-recoverable I/O error occurred. The OpenSSL error queue may contain more information on the error. For socket I/O on Unix systems, consult \fBerrno\fR for details. .IP "\s-1SSL_ERROR_SSL\s0" 4 .IX Item "SSL_ERROR_SSL" A failure in the \s-1SSL\s0 library occurred, usually a protocol error. The OpenSSL error queue contains more information on the error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIssl\fR\|(3), \fIerr\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1SSL_ERROR_WANT_ASYNC\s0 was added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP 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 .