SSL_WANT(3) BSD Library Functions Manual SSL_WANT(3)NAME
SSL_want, SSL_want_nothing, SSL_want_read, SSL_want_write,
SSL_want_x509_lookup — obtain state information TLS/SSL I/O operation
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);
DESCRIPTIONSSL_want() returns state information for the SSL object ssl.
The other SSL_want_*() calls are shortcuts for the possible states
returned by SSL_want().
NOTESSSL_want() examines the internal state information of the SSL object.
Its return values are similar to those of SSL_get_error(3). Unlike
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
SSL_get_error(3).
The result returned by SSL_want() should always be consistent with the
result of SSL_get_error(3).
RETURN VALUES
The following return values can currently occur for SSL_want():
.Dv SSL_NOTHING
There is no data to be written or to be read.
.Dv 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(3) 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(3) 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(3) has asked to be called
again. A call to SSL_get_error(3) should return
SSL_ERROR_WANT_X509_LOOKUP.
SSL_want_nothing(), SSL_want_read(), SSL_want_write(), and
SSL_want_x509_lookup() return 1 when the corresponding condition is true
or 0 otherwise.
SEE ALSOerr(3), ssl(3), SSL_get_error(3)BSD April 26, 2024 BSD
