77 lines
2.2 KiB
Text
77 lines
2.2 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup - 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);
|
|
|
|
=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)|SSL_get_error(3)>.
|
|
Unlike L<SSL_get_error(3)|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)|SSL_get_error(3)>.
|
|
|
|
The result returned by SSL_want() should always be consistent with
|
|
the result of L<SSL_get_error(3)|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)|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)|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)|SSL_get_error(3)> should return
|
|
SSL_ERROR_WANT_X509_LOOKUP.
|
|
|
|
=back
|
|
|
|
SSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup()
|
|
return 1, when the corresponding condition is true or 0 otherwise.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(3)|ssl(3)>, L<err(3)|err(3)>, L<SSL_get_error(3)|SSL_get_error(3)>
|
|
|
|
=cut
|