1 .\" $NetBSD: SSL_want.3,v 1.14 2015/06/12 17:01:14 christos Exp $
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135 .\" ========================================================================
137 .IX Title "SSL_want 3"
138 .TH SSL_want 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup \- obtain state information TLS/SSL I/O operation
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/ssl.h>
152 \& int SSL_want(const SSL *ssl);
153 \& int SSL_want_nothing(const SSL *ssl);
154 \& int SSL_want_read(const SSL *ssl);
155 \& int SSL_want_write(const SSL *ssl);
156 \& int SSL_want_x509_lookup(const SSL *ssl);
159 .IX Header "DESCRIPTION"
160 \&\fISSL_want()\fR returns state information for the \s-1SSL\s0 object \fBssl\fR.
162 The other SSL_want_*() calls are shortcuts for the possible states returned
166 \&\fISSL_want()\fR examines the internal state information of the \s-1SSL\s0 object. Its
167 return values are similar to that of \fISSL_get_error\fR\|(3).
168 Unlike \fISSL_get_error\fR\|(3), which also evaluates the
169 error queue, the results are obtained by examining an internal state flag
170 only. The information must therefore only be used for normal operation under
171 non-blocking I/O. Error conditions are not handled and must be treated
172 using \fISSL_get_error\fR\|(3).
174 The result returned by \fISSL_want()\fR should always be consistent with
175 the result of \fISSL_get_error\fR\|(3).
177 .IX Header "RETURN VALUES"
178 The following return values can currently occur for \fISSL_want()\fR:
179 .IP "\s-1SSL_NOTHING\s0" 4
180 .IX Item "SSL_NOTHING"
181 There is no data to be written or to be read.
182 .IP "\s-1SSL_WRITING\s0" 4
183 .IX Item "SSL_WRITING"
184 There are data in the \s-1SSL\s0 buffer that must be written to the underlying
185 \&\fB\s-1BIO\s0\fR layer in order to complete the actual SSL_*() operation.
186 A call to \fISSL_get_error\fR\|(3) should return
187 \&\s-1SSL_ERROR_WANT_WRITE.\s0
188 .IP "\s-1SSL_READING\s0" 4
189 .IX Item "SSL_READING"
190 More data must be read from the underlying \fB\s-1BIO\s0\fR layer in order to
191 complete the actual SSL_*() operation.
192 A call to \fISSL_get_error\fR\|(3) should return
193 \&\s-1SSL_ERROR_WANT_READ.\s0
194 .IP "\s-1SSL_X509_LOOKUP\s0" 4
195 .IX Item "SSL_X509_LOOKUP"
196 The operation did not complete because an application callback set by
197 \&\fISSL_CTX_set_client_cert_cb()\fR has asked to be called again.
198 A call to \fISSL_get_error\fR\|(3) should return
199 \&\s-1SSL_ERROR_WANT_X509_LOOKUP.\s0
201 \&\fISSL_want_nothing()\fR, \fISSL_want_read()\fR, \fISSL_want_write()\fR, \fISSL_want_x509_lookup()\fR
202 return 1, when the corresponding condition is true or 0 otherwise.
204 .IX Header "SEE ALSO"
205 \&\fIssl\fR\|(3), \fIopenssl_err\fR\|(3), \fISSL_get_error\fR\|(3)