New documentation about things related to SSL_CIPHER. Submitted by Lutz Jaenicke...

[openssl.git] / doc / ssl / SSL_get_error.pod

diff --git a/doc/ssl/SSL_get_error.pod b/doc/ssl/SSL_get_error.pod
index 26f7b3d3d08f5791bb5d64e294e8390e7b867cbe..d85b564258282011faa591f77f55f9daf5117189 100644 (file)
--- a/doc/ssl/SSL_get_error.pod
+++ b/doc/ssl/SSL_get_error.pod
@@ -2,7 +2,7 @@
 
 =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
 
@@ -15,14 +15,14 @@ SSL_get_error - obtain result code for SSL I/O operation
 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
@@ -33,27 +33,29 @@ The following return values can currently occur:
 
 =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.
 
@@ -61,7 +63,7 @@ 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
@@ -75,14 +77,14 @@ I/O error (for socket I/O on Unix systems, consult B<errno> for details).
 
 =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
 
 =head1 SEE ALSO
 
-ssl(3), err(3)
+L<ssl(3)|ssl(3)>, L<err(3)|err(3)>
 
 =head1 HISTORY