mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
104 lines
3.0 KiB
Plaintext
104 lines
3.0 KiB
Plaintext
=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(7)>, L<err(7)>, 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
|