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Title "SSL_WANT 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup, SSL_want_async, SSL_want_async_job, SSL_want_client_hello_cb - obtain state information TLS/SSL I/O operation Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& int SSL_want(const SSL *ssl); int SSL_want_nothing(const SSL *ssl); int SSL_want_read(const SSL *ssl); int SSL_want_write(const SSL *ssl); int SSL_want_x509_lookup(const SSL *ssl); int SSL_want_async(const SSL *ssl); int SSL_want_async_job(const SSL *ssl); int SSL_want_client_hello_cb(const SSL *ssl); .Ve Header "DESCRIPTION" \fBSSL_want() returns state information for the \s-1SSL\s0 object ssl.

The other SSL_want_*() calls are shortcuts for the possible states returned by SSL_want().

Header "NOTES" \fBSSL_want() examines the internal state information of the \s-1SSL\s0 object. Its return values are similar to that of SSL_get_error\|(3). Unlike SSL_get_error\|(3), which also evaluates the error queue, the results are obtained by examining an internal state flag only. The information must therefore only be used for normal operation under non-blocking I/O. Error conditions are not handled and must be treated using SSL_get_error\|(3).

The result returned by SSL_want() should always be consistent with the result of SSL_get_error\|(3).

Header "RETURN VALUES" The following return values can currently occur for SSL_want(): Item "SSL_NOTHING" There is no data to be written or to be read. Item "SSL_WRITING" There are data in the \s-1SSL\s0 buffer that must be written to the underlying \fB\s-1BIO\s0 layer in order to complete the actual SSL_*() operation. A call to SSL_get_error\|(3) should return \s-1SSL_ERROR_WANT_WRITE.\s0 Item "SSL_READING" More data must be read from the underlying \s-1BIO\s0 layer in order to complete the actual SSL_*() operation. A call to SSL_get_error\|(3) should return \s-1SSL_ERROR_WANT_READ.\s0 Item "SSL_X509_LOOKUP" The operation did not complete because an application callback set by \fBSSL_CTX_set_client_cert_cb() has asked to be called again. A call to SSL_get_error\|(3) should return \s-1SSL_ERROR_WANT_X509_LOOKUP.\s0 Item "SSL_ASYNC_PAUSED" An asynchronous operation partially completed and was then paused. See \fBSSL_get_all_async_fds\|(3). A call to SSL_get_error\|(3) should return \s-1SSL_ERROR_WANT_ASYNC.\s0 Item "SSL_ASYNC_NO_JOBS" The asynchronous job could not be started because there were no async jobs available in the pool (see ASYNC_init_thread\|(3)). A call to SSL_get_error\|(3) should return \s-1SSL_ERROR_WANT_ASYNC_JOB.\s0 Item "SSL_CLIENT_HELLO_CB" The operation did not complete because an application callback set by \fBSSL_CTX_set_client_hello_cb() has asked to be called again. A call to SSL_get_error\|(3) should return \s-1SSL_ERROR_WANT_CLIENT_HELLO_CB.\s0

\fBSSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup(), \fBSSL_want_async(), SSL_want_async_job(), and SSL_want_client_hello_cb() return 1, when the corresponding condition is true or 0 otherwise.

Header "SEE ALSO" \fBssl\|(7), SSL_get_error\|(3) Header "HISTORY" The SSL_want_client_hello_cb() function and the \s-1SSL_CLIENT_HELLO_CB\s0 return value were added in OpenSSL 1.1.1. Header "COPYRIGHT" Copyright 2001-2017 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>.