commit 7b3ac6b389dd1332b0bf3d907a964ba1ee8fb067
Author: Joshua Phillips <jp.sittingduck@gmail.com>
Date:   Thu Sep 23 12:08:08 2010 +0100

    Free resources after a connection error.
    
    - Add is_open field of xcb_connection_t. is_open is set to 1 for open
      connections that require clean-up.
    - error_connection is now an xcb_connection_t with has_error and is_open
      always set to 1 and 0 respectively.

diff --git a/src/xcb_conn.c b/src/xcb_conn.c
index f2a2636..3318526 100644
--- a/src/xcb_conn.c
+++ b/src/xcb_conn.c
@@ -58,7 +58,10 @@ typedef struct {
     uint16_t length;
 } xcb_setup_generic_t;
 
-static const int error_connection = 1;
+static const xcb_connection_t error_connection = {
+    1, /* has_error */
+    0, /* is_open */
+};
 
 static int set_fd_flags(const int fd)
 {
@@ -272,6 +275,7 @@ xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
     }
 
     c->fd = fd;
+    c->is_open = 1;
 
     if(!(
         set_fd_flags(fd) &&
@@ -293,7 +297,7 @@ xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
 
 void xcb_disconnect(xcb_connection_t *c)
 {
-    if(c->has_error)
+    if (!c->is_open)
         return;
 
     free(c->setup);
diff --git a/src/xcbint.h b/src/xcbint.h
index f07add8..bbaa460 100644
--- a/src/xcbint.h
+++ b/src/xcbint.h
@@ -176,6 +176,7 @@ void _xcb_ext_destroy(xcb_connection_t *c);
 
 struct xcb_connection_t {
     int has_error;
+    int is_open;
 
     /* constant data */
     xcb_setup_t *setup;