=head1 NAME
-SSL_get_error - obtain result code for SSL I/O operation
+SSL_get_error - obtain result code for TLS/SSL I/O operation
=head1 SYNOPSIS
SSL_get_error() returns a result code (suitable for the C "switch"
statement) for a preceding call to SSL_connect(), SSL_accept(),
SSL_read(), or SSL_write() on B<ssl>. The value returned by that
-SSL I/O function must be passed to SSL_get_error() in parameter
+TLS/SSL I/O function must be passed to SSL_get_error() in parameter
B<ret>.
In addition to B<ssl> and B<ret>, SSL_get_error() inspects the
current thread's OpenSSL error queue. Thus, SSL_get_error() must be
-used in the same thread that performed the SSL I/O operation, and no
-other OpenSSL function calls should appear inbetween. The current
-thread's error queue must be empty before the SSL I/O operation is
+used in the same thread that performed the TLS/SSL I/O operation, and no
+other OpenSSL function calls should appear in between. The current
+thread's error queue must be empty before the TLS/SSL I/O operation is
attempted, or SSL_get_error() will not work reliably.
=head1 RETURN VALUES
=item SSL_ERROR_NONE
-The SSL I/O operation completed. This result code is returned
-if and only if B<ret > 0>.
+The TLS/SSL I/O operation completed. This result code is returned
+if and only if B<ret E<gt> 0>.
=item SSL_ERROR_ZERO_RETURN
-The SSL connection has been closed. If the protocol version is SSL 3.0
+The TLS/SSL connection has been closed. If the protocol version is SSL 3.0
or TLS 1.0, this result code is returned only if a closure
-alerts has occured in the protocol, i.e. if the connection has been
-closed cleanly.
+alert has occurred in the protocol, i.e. if the connection has been
+closed cleanly. Note that in this case B<SSL_ERROR_ZERO_RETURN>
+does not necessarily indicate that the underlying transport
+has been closed.
=item SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE
-The operation did not complete; the same SSL I/O function should be
+The operation did not complete; the same TLS/SSL I/O function should be
called again later. There will be protocol progress if, by then, the
underlying B<BIO> has data available for reading (if the result code is
B<SSL_ERROR_WANT_READ>) or allows writing data (B<SSL_ERROR_WANT_WRITE>).
For socket B<BIO>s (e.g. when SSL_set_fd() was used) this means that
select() or poll() on the underlying socket can be used to find out
-when the SSL I/O function should be retried.
+when the TLS/SSL I/O function should be retried.
-Caveat: Any SSL I/O function can lead to either of
+Caveat: Any TLS/SSL I/O function can lead to either of
B<SSL_ERROR_WANT_READ> and B<SSL_ERROR_WANT_WRITE>, i.e. SSL_read()
may want to write data and SSL_write() may want to read data.
The operation did not complete because an application callback set by
SSL_CTX_set_client_cert_cb() has asked to be called again.
-The SSL I/O function should be called again later.
+The TLS/SSL I/O function should be called again later.
Details depend on the application.
=item SSL_ERROR_SYSCALL
=item SSL_ERROR_SSL
-A failure in the SSL library occured, usually a protocol error. The
+A failure in the SSL library occurred, usually a protocol error. The
OpenSSL error queue contains more information on the error.
=back