Check for the availability of the xinerama extension.

Makefile.am

@@ -237,6 +237,7 @@ helper_test_LDADD=\
 	$(x11_LIBS)\
 	$(GW_XCB_LIBS)\
 	$(xinerama_LIBS)\
+	$(libsn_LIBS)\
 	$(cairo_LIBS)
 
 TESTS=\

include/xcb-internal.h

@@ -18,6 +18,7 @@ struct _xcb_stuff
     int                   screen_nbr;
     SnDisplay             *sndisplay;
     SnLauncheeContext     *sncontext;
+    gboolean              has_xinerama;
 };
 
 #endif

source/dialogs/window.c

@@ -38,6 +38,8 @@
 #include <xcb/xcb_ewmh.h>
 #include <xcb/xcb_icccm.h>
 
+#include <glib.h>
+
 #include "xcb-internal.h"
 #include "xcb.h"
 

source/rofi.c

@@ -37,6 +37,7 @@
 #include <xcb/xcb.h>
 #include <xcb/xcb_aux.h>
 #include <xcb/xcb_ewmh.h>
+#include <xcb/xinerama.h>
 #include <xcb/xkb.h>
 #include <xkbcommon/xkbcommon.h>
 #include <xkbcommon/xkbcommon-compose.h>
@@ -446,6 +447,12 @@ static inline void load_configuration_dynamic ( )
  */
 static gboolean main_loop_x11_event_handler ( xcb_generic_event_t *ev, G_GNUC_UNUSED gpointer data )
 {
+    if ( ev == NULL ) {
+        int status = xcb_connection_has_error ( xcb->connection );
+        fprintf ( stderr, "The XCB connection to X server had a fatal error: %d\n", status );
+        g_main_loop_quit ( main_loop );
+        return G_SOURCE_REMOVE;
+    }
     uint8_t type = ev->response_type & ~0x80;
     if ( type == xkb.first_event ) {
         switch ( ev->pad0 )
@@ -739,16 +746,42 @@ int main ( int argc, char *argv[] )
         fprintf ( stderr, "Failed to get keyboard compose table. Trying to limp on.\n" );
     }
 
+    if ( xcb_connection_has_error ( xcb->connection ) ) {
+        fprintf ( stderr, "Connection has error\n" );
+        exit ( EXIT_FAILURE );
+    }
     x11_setup ( &xkb );
+    if ( xcb_connection_has_error ( xcb->connection ) ) {
+        fprintf ( stderr, "Connection has error\n" );
+        exit ( EXIT_FAILURE );
+    }
+
+    const xcb_query_extension_reply_t *er = xcb_get_extension_data ( xcb->connection, &xcb_xinerama_id );
+    if ( er ) {
+        if ( er->present ) {
+            xcb_xinerama_is_active_cookie_t is_active_req = xcb_xinerama_is_active ( xcb->connection );
+            xcb_xinerama_is_active_reply_t  *is_active    = xcb_xinerama_is_active_reply ( xcb->connection, is_active_req, NULL );
+            xcb->has_xinerama = is_active->state;
+            free ( is_active );
+        }
+    }
     main_loop = g_main_loop_new ( NULL, FALSE );
 
     TICK_N ( "Setup mainloop" );
     // startup not.
     xcb->sndisplay = sn_xcb_display_new ( xcb->connection, error_trap_push, error_trap_pop );
+    if ( xcb_connection_has_error ( xcb->connection ) ) {
+        fprintf ( stderr, "Connection has error\n" );
+        exit ( EXIT_FAILURE );
+    }
 
     if ( xcb->sndisplay != NULL ) {
         xcb->sncontext = sn_launchee_context_new_from_environment ( xcb->sndisplay, xcb->screen_nbr );
     }
+    if ( xcb_connection_has_error ( xcb->connection ) ) {
+        fprintf ( stderr, "Connection has error\n" );
+        exit ( EXIT_FAILURE );
+    }
     TICK_N ( "Startup Notification" );
 
     // Initialize Xresources subsystem.

source/x11-helper.c

@@ -57,6 +57,7 @@ struct _xcb_stuff xcb_int = {
     .screen_nbr   =    -1,
     .sndisplay    = NULL,
     .sncontext    = NULL,
+    .has_xinerama = FALSE,
 };
 xcb_stuff         *xcb = &xcb_int;
 
@@ -106,22 +107,17 @@ int monitor_get_smallest_size ( void )
 {
     xcb_generic_error_t *error;
     int                 size = MIN ( xcb->screen->width_in_pixels, xcb->screen->height_in_pixels );
-    xcb_xinerama_is_active_cookie_t is_active_req = xcb_xinerama_is_active ( xcb->connection );
-    xcb_xinerama_is_active_reply_t  *is_active    = xcb_xinerama_is_active_reply ( xcb->connection, is_active_req, &error );
-    if ( error ) {
-        fprintf ( stderr, "Couldn't query Xinerama\n" );
-        return size;
-    }
-    if ( is_active == NULL ) {
-        return size;
-    }
-    if ( !is_active->state ) {
-        free ( is_active );
-        return size;
-    }
-    free ( is_active );
 
+    if ( !xcb->has_xinerama ) {
+        return size;
+    }
+
+    if ( xcb_connection_has_error ( xcb->connection ) ) {
+        fprintf ( stderr, "1.Connection has error\n" );
+        exit ( EXIT_FAILURE );
+    }
     xcb_xinerama_query_screens_cookie_t cookie_screen;
+
     cookie_screen = xcb_xinerama_query_screens ( xcb->connection );
     xcb_xinerama_query_screens_reply_t *query_screens;
     query_screens = xcb_xinerama_query_screens_reply ( xcb->connection, cookie_screen, &error );
@@ -147,20 +143,9 @@ int monitor_get_dimension ( int monitor, workarea *mon )
     mon->w = xcb->screen->width_in_pixels;
     mon->h = xcb->screen->height_in_pixels;
 
-    xcb_xinerama_is_active_cookie_t is_active_req = xcb_xinerama_is_active ( xcb->connection );
-    xcb_xinerama_is_active_reply_t  *is_active    = xcb_xinerama_is_active_reply ( xcb->connection, is_active_req, &error );
-    if ( error ) {
-        fprintf ( stderr, "Error getting screen info\n" );
+    if ( !xcb->has_xinerama ) {
         return FALSE;
     }
-    if ( is_active == NULL ) {
-        return FALSE;
-    }
-    if ( !is_active->state ) {
-        free ( is_active );
-        return FALSE;
-    }
-    free ( is_active );
 
     xcb_xinerama_query_screens_cookie_t cookie_screen;
     cookie_screen = xcb_xinerama_query_screens ( xcb->connection );
@@ -193,20 +178,9 @@ void monitor_dimensions ( int x, int y, workarea *mon )
     mon->w = xcb->screen->width_in_pixels;
     mon->h = xcb->screen->height_in_pixels;
 
-    xcb_xinerama_is_active_cookie_t is_active_req = xcb_xinerama_is_active ( xcb->connection );
-    xcb_xinerama_is_active_reply_t  *is_active    = xcb_xinerama_is_active_reply ( xcb->connection, is_active_req, &error );
-    if ( error ) {
-        fprintf ( stderr, "Couldn't query Xinerama\n" );
+    if ( !xcb->has_xinerama ) {
         return;
     }
-    if ( is_active == NULL ) {
-        return;
-    }
-    if ( !is_active->state ) {
-        free ( is_active );
-        return;
-    }
-    free ( is_active );
 
     xcb_xinerama_query_screens_cookie_t cookie_screen;
     cookie_screen = xcb_xinerama_query_screens ( xcb->connection );
@@ -328,6 +302,10 @@ void monitor_active ( workarea *mon )
 int take_keyboard ( xcb_window_t w )
 {
     for ( int i = 0; i < 500; i++ ) {
+        if ( xcb_connection_has_error ( xcb->connection ) ) {
+            fprintf ( stderr, "Connection has error\n" );
+            exit ( EXIT_FAILURE );
+        }
         xcb_grab_keyboard_cookie_t cc = xcb_grab_keyboard ( xcb->connection,
                                                             1, w, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC,
                                                             XCB_GRAB_MODE_ASYNC );

test/helper-test.c

@@ -25,9 +25,10 @@ struct xcb_stuff *xcb;
         }                                                                                \
 }
 
-void rofi_view_error_dialog ( const char *msg, G_GNUC_UNUSED int markup )
+int rofi_view_error_dialog ( const char *msg, G_GNUC_UNUSED int markup )
 {
     fputs ( msg, stderr );
+    return TRUE;
 }
 
 int show_error_message ( const char *msg, int markup )