78 lines
2.2 KiB
Plaintext
78 lines
2.2 KiB
Plaintext
=pod
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=head1 NAME
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SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write, SSL_want_x509_lookup - obtain state information TLS/SSL I/O operation
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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int SSL_want(const SSL *ssl);
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int SSL_want_nothing(const SSL *ssl);
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int SSL_want_read(const SSL *ssl);
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int SSL_want_write(const SSL *ssl);
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int SSL_want_x509_lookup(const SSL *ssl);
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=head1 DESCRIPTION
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SSL_want() returns state information for the SSL object B<ssl>.
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The other SSL_want_*() calls are shortcuts for the possible states returned
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by SSL_want().
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=head1 NOTES
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SSL_want() examines the internal state information of the SSL object. Its
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return values are similar to that of L<SSL_get_error(3)|SSL_get_error(3)>.
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Unlike L<SSL_get_error(3)|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 L<SSL_get_error(3)|SSL_get_error(3)>.
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The result returned by SSL_want() should always be consistent with
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the result of L<SSL_get_error(3)|SSL_get_error(3)>.
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=head1 RETURN VALUES
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The following return values can currently occur for SSL_want():
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=over 4
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=item SSL_NOTHING
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There is no data to be written or to be read.
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=item SSL_WRITING
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There are data in the SSL buffer that must be written to the underlying
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B<BIO> layer in order to complete the actual SSL_*() operation.
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A call to L<SSL_get_error(3)|SSL_get_error(3)> should return
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SSL_ERROR_WANT_WRITE.
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=item SSL_READING
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More data must be read from the underlying B<BIO> layer in order to
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complete the actual SSL_*() operation.
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A call to L<SSL_get_error(3)|SSL_get_error(3)> should return
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SSL_ERROR_WANT_READ.
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=item SSL_X509_LOOKUP
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The operation did not complete because an application callback set by
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SSL_CTX_set_client_cert_cb() has asked to be called again.
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A call to L<SSL_get_error(3)|SSL_get_error(3)> should return
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SSL_ERROR_WANT_X509_LOOKUP.
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=back
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SSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup()
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return 1, when the corresponding condition is true or 0 otherwise.
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=head1 SEE ALSO
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L<ssl(3)|ssl(3)>, L<err(3)|err(3)>, L<SSL_get_error(3)|SSL_get_error(3)>
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=cut
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