Name

SSL_want, SSL_want_nothing
SSL_want_read, SSL_want_write
SSL_want_x509_lookup

obtain state information TLS/SSL I/O operation

Library

libssl.lib

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);

Detailed Description

SSL_want() returns state information for the SSL object ssl.

The other SSL_want_*() calls are shortcuts for the possible states returned by SSL_want().

SSL_want() examines the internal state information of the SSL object. Its return values are similar to that of SSL_get_error(). Unlike SSL_get_error(), 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 SSL_get_error().

The result returned by SSL_want() should always be consistent with the result of SSL_get_error().

Return Values

The following return values can currently occur for SSL_want():

SSL_NOTHING: There is no data to be written or to be read.

SSL_WRITING: There are data in the SSL buffer that must be written to the underlying BIO layer in order to complete the actual SSL_*() operation. A call to SSL_get_error() should return SSL_ERROR_WANT_WRITE.

SSL_READING: More data must be read from the underlying BIO layer in order to complete the actual SSL_*() operation. A call to SSL_get_error() should return SSL_ERROR_WANT_READ.

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 SSL_get_error() should return SSL_ERROR_WANT_X509_LOOKUP.

SSL_want_nothing(), SSL_want_read(), SSL_want_write(), SSL_want_x509_lookup() return 1, when the corresponding condition is true or 0 otherwise.

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