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Diffstat (limited to 'openssl-1.1.0h/doc/ssl/SSL_want.pod')
| -rw-r--r-- | openssl-1.1.0h/doc/ssl/SSL_want.pod | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/openssl-1.1.0h/doc/ssl/SSL_want.pod b/openssl-1.1.0h/doc/ssl/SSL_want.pod new file mode 100644 index 0000000..e179d6b --- /dev/null +++ b/openssl-1.1.0h/doc/ssl/SSL_want.pod @@ -0,0 +1,103 @@ +=pod + +=head1 NAME + +SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup, +SSL_want_async, SSL_want_async_job - obtain state information TLS/SSL I/O +operation + +=head1 SYNOPSIS + + #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); + +=head1 DESCRIPTION + +SSL_want() returns state information for the SSL object B<ssl>. + +The other SSL_want_*() calls are shortcuts for the possible states returned +by SSL_want(). + +=head1 NOTES + +SSL_want() examines the internal state information of the SSL object. Its +return values are similar to that of L<SSL_get_error(3)>. +Unlike L<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 L<SSL_get_error(3)>. + +The result returned by SSL_want() should always be consistent with +the result of L<SSL_get_error(3)>. + +=head1 RETURN VALUES + +The following return values can currently occur for SSL_want(): + +=over 4 + +=item SSL_NOTHING + +There is no data to be written or to be read. + +=item SSL_WRITING + +There are data in the SSL buffer that must be written to the underlying +B<BIO> layer in order to complete the actual SSL_*() operation. +A call to L<SSL_get_error(3)> should return +SSL_ERROR_WANT_WRITE. + +=item SSL_READING + +More data must be read from the underlying B<BIO> layer in order to +complete the actual SSL_*() operation. +A call to L<SSL_get_error(3)> should return +SSL_ERROR_WANT_READ. + +=item SSL_X509_LOOKUP + +The operation did not complete because an application callback set by +SSL_CTX_set_client_cert_cb() has asked to be called again. +A call to L<SSL_get_error(3)> should return +SSL_ERROR_WANT_X509_LOOKUP. + +=item SSL_ASYNC_PAUSED + +An asynchronous operation partially completed and was then paused. See +L<SSL_get_all_async_fds(3)>. A call to L<SSL_get_error(3)> should return +SSL_ERROR_WANT_ASYNC. + +=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 L<SSL_get_error(3)> +should return SSL_ERROR_WANT_ASYNC_JOB. + +=back + +SSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup(), +SSL_want_async() and SSL_want_async_job() return 1, when the corresponding +condition is true or 0 otherwise. + +=head1 SEE ALSO + +L<ssl(3)>, L<err(3)>, L<SSL_get_error(3)> + +=head1 COPYRIGHT + +Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved. + +Licensed under the OpenSSL license (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<https://www.openssl.org/source/license.html>. + +=cut |