Make non blocking I/O work for accept BIOs.

diff --git a/ssl/bio_ssl.c b/ssl/bio_ssl.c
index d85555a..9141ec0 100644
--- a/ssl/bio_ssl.c
+++ b/ssl/bio_ssl.c

@@ -206,6 +206,10 @@
 		BIO_set_retry_special(b);
 		retry_reason=BIO_RR_SSL_X509_LOOKUP;
 		break;
+	case SSL_ERROR_WANT_ACCEPT:
+		BIO_set_retry_special(b);
+		retry_reason=BIO_RR_ACCEPT;
+		break;
 	case SSL_ERROR_WANT_CONNECT:
 		BIO_set_retry_special(b);
 		retry_reason=BIO_RR_CONNECT;

diff --git a/ssl/ssl.h b/ssl/ssl.h
index 87e609e..2bc994a 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h

@@ -831,6 +831,7 @@
 #define SSL_ERROR_SYSCALL		5 /* look at error stack/return value/errno */
 #define SSL_ERROR_ZERO_RETURN		6
 #define SSL_ERROR_WANT_CONNECT		7
+#define SSL_ERROR_WANT_ACCEPT		8
 
 #define SSL_CTRL_NEED_TMP_RSA			1
 #define SSL_CTRL_SET_TMP_RSA			2

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index fec98dd..ed2b820 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c

@@ -1543,6 +1543,8 @@
 			reason=BIO_get_retry_reason(bio);
 			if (reason == BIO_RR_CONNECT)
 				return(SSL_ERROR_WANT_CONNECT);
+			else if (reason == BIO_RR_ACCEPT)
+				return(SSL_ERROR_WANT_ACCEPT);
 			else
 				return(SSL_ERROR_SYSCALL); /* unknown */
 			}
@@ -1561,6 +1563,8 @@
 			reason=BIO_get_retry_reason(bio);
 			if (reason == BIO_RR_CONNECT)
 				return(SSL_ERROR_WANT_CONNECT);
+			else if (reason == BIO_RR_ACCEPT)
+				return(SSL_ERROR_WANT_ACCEPT);
 			else
 				return(SSL_ERROR_SYSCALL);
 			}