X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=doc%2Fssl%2FSSL_write.pod;h=e013c12d5254b0d4d08bb0d6ef47972994b72ada;hb=5a84b7fc2db33cdefc5a7b62f0169f2c08fb3d9b;hp=da66f0f056fc2be2e63b90e7dfea8fc498a2ced1;hpb=7abe76e1bdb50ac8cfc54a8e28e9275aeb64c84d;p=oweals%2Fopenssl.git

diff --git a/doc/ssl/SSL_write.pod b/doc/ssl/SSL_write.pod
index da66f0f056..e013c12d52 100644
--- a/doc/ssl/SSL_write.pod
+++ b/doc/ssl/SSL_write.pod
@@ -65,6 +65,9 @@ When an SSL_write() operation has to be repeated because of
 B<SSL_ERROR_WANT_READ> or B<SSL_ERROR_WANT_WRITE>, it must be repeated
 with the same arguments.
 
+When calling SSL_write() with num=0 bytes to be sent the behaviour is
+undefined.
+
 =head1 RETURN VALUES
 
 The following return values can occur:
@@ -78,8 +81,14 @@ bytes actually written to the TLS/SSL connection.
 
 =item 0
 
-The write operation was not successful. Call SSL_get_error() with the return
-value B<ret> to find out, whether an error occurred.
+The write operation was not successful. Probably the underlying connection
+was closed. Call SSL_get_error() with the return value B<ret> to find out,
+whether an error occurred or the connection was shut down cleanly
+(SSL_ERROR_ZERO_RETURN).
+
+SSLv2 (deprecated) does not support a shutdown alert protocol, so it can
+only be detected, whether the underlying connection was closed. It cannot
+be checked, why the closure happened.
 
 =item E<lt>0