Add a check_conn() function for debugging purposes.

diff --git a/spectrwm.c b/spectrwm.c
index 0e70061..f4ab936 100644 (file)
--- a/spectrwm.c
+++ b/spectrwm.c
@@ -649,6 +649,7 @@ struct ewmh_hint {
 
 /* function prototypes */
 void    buttonpress(xcb_button_press_event_t *);
+void    check_conn(void);
 void    clientmessage(xcb_client_message_event_t *);
 int     conf_load(char *, int);
 void    configurenotify(xcb_configure_notify_event_t *);
@@ -761,7 +762,11 @@ get_screen(int screen)
        const xcb_setup_t       *r;
        xcb_screen_iterator_t   iter;
 
-       r = xcb_get_setup(conn);
+       if ((r = xcb_get_setup(conn)) == NULL) {
+               DNPRINTF(SWM_D_MISC, "get_screen: xcb_get_setup\n");
+               check_conn();
+       }
+
        iter = xcb_setup_roots_iterator(r);
        for (; iter.rem; --screen, xcb_screen_next(&iter))
                if (screen == 0)
@@ -7401,6 +7406,36 @@ clientmessage(xcb_client_message_event_t *e)
        xcb_flush(conn);
 }
 
+void
+check_conn(void)
+{
+       int      err = xcb_connection_has_error(conn);
+       char    *s;
+
+       switch (err) {
+       case XCB_CONN_ERROR:
+               s = "Socket error, pipe error or other stream error.";
+               break;
+       case XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
+               s = "Extension not supported.";
+               break;
+       case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
+               s = "Insufficient memory.";
+               break;
+       case XCB_CONN_CLOSED_REQ_LEN_EXCEED:
+               s = "Request length was exceeded.";
+               break;
+       case XCB_CONN_CLOSED_PARSE_ERR:
+               s = "Error parsing display string.";
+               break;
+       default:
+               s = "Unknown error.";
+       }
+
+       if (err)
+               errx(err, "X CONNECTION ERROR: %s", s);
+}
+
 int
 enable_wm(void)
 {