209 lines
6.2 KiB
Groff
209 lines
6.2 KiB
Groff
.\" $NetBSD: SSL_want.3,v 1.4 2002/08/09 16:15:44 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_want 3"
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.TH SSL_want 3 "0.9.6g" "2002-08-05" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup \- obtain state information \s-1TLS/SSL\s0 I/O operation
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 5
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\& int SSL_want(SSL *ssl);
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\& int SSL_want_nothing(SSL *ssl);
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\& int SSL_want_read(SSL *ssl);
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\& int SSL_want_write(SSL *ssl);
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\& int SSL_want_x509_lookup(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_want()\fR returns state information for the \s-1SSL\s0 object \fBssl\fR.
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.PP
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The other SSL_want_*() calls are shortcuts for the possible states returned
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by \fISSL_want()\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fISSL_want()\fR examines the internal state information of the \s-1SSL\s0 object. Its
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return values are similar to that of SSL_get_error(3).
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Unlike SSL_get_error(3), which also evaluates the
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error queue, the results are obtained by examining an internal state flag
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only. The information must therefore only be used for normal operation under
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non-blocking I/O. Error conditions are not handled and must be treated
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using SSL_get_error(3).
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.PP
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The result returned by \fISSL_want()\fR should always be consistent with
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the result of SSL_get_error(3).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can currently occur for \fISSL_want()\fR:
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.Ip "\s-1SSL_NOTHING\s0" 4
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.IX Item "SSL_NOTHING"
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There is no data to be written or to be read.
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.Ip "\s-1SSL_WRITING\s0" 4
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.IX Item "SSL_WRITING"
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There are data in the \s-1SSL\s0 buffer that must be written to the underlying
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\&\fB\s-1BIO\s0\fR layer in order to complete the actual SSL_*() operation.
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A call to SSL_get_error(3) should return
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\&\s-1SSL_ERROR_WANT_WRITE\s0.
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.Ip "\s-1SSL_READING\s0" 4
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.IX Item "SSL_READING"
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More data must be read from the underlying \fB\s-1BIO\s0\fR layer in order to
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complete the actual SSL_*() operation.
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A call to SSL_get_error(3) should return
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\&\s-1SSL_ERROR_WANT_READ\s0.
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.Ip "\s-1SSL_X509_LOOKUP\s0" 4
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.IX Item "SSL_X509_LOOKUP"
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The operation did not complete because an application callback set by
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\&\fISSL_CTX_set_client_cert_cb()\fR has asked to be called again.
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A call to SSL_get_error(3) should return
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\&\s-1SSL_ERROR_WANT_X509_LOOKUP\s0.
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.PP
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\&\fISSL_want_nothing()\fR, \fISSL_want_read()\fR, \fISSL_want_write()\fR, \fISSL_want_x509_lookup()\fR
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return 1, when the corresponding condition is true or 0 otherwise.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3), openssl_err(3), SSL_get_error(3)
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