[gnome-software: 2/15] gs-common: Add fallback copy of g_clear_signal_handler()

[Philip Withnall <pwithnall src gnome org>]

commit 2e4703c96a834ac3de8885d688a605ac2413bbbd
Author: Philip Withnall <pwithnall endlessos org>
Date:   Fri Jul 23 17:32:40 2021 +0100

    gs-common: Add fallback copy of g_clear_signal_handler()
    
    It was added to GLib in 2.62, but we only depend on 2.55. Until our GLib
    dependency is bumped, carry an internal copy of the macro, since it’s
    quite useful.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 src/gs-common.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
---
diff --git a/src/gs-common.h b/src/gs-common.h
index ebc5d0952..cc27dbcb6 100644
--- a/src/gs-common.h
+++ b/src/gs-common.h
@@ -56,4 +56,21 @@ gboolean     gs_utils_split_time_difference  (gint64 unix_time_seconds,
                                                 gint *out_months_ago,
                                                 gint *out_years_ago);
 
+#if !GLIB_CHECK_VERSION(2, 62, 0)
+
+#define  g_clear_signal_handler(handler_id_ptr, instance)           \
+  G_STMT_START {                                                    \
+    gpointer const _instance      = (instance);                     \
+    gulong *const _handler_id_ptr = (handler_id_ptr);               \
+    const gulong _handler_id      = *_handler_id_ptr;               \
+                                                                    \
+    if (_handler_id > 0)                                            \
+      {                                                             \
+        *_handler_id_ptr = 0;                                       \
+        g_signal_handler_disconnect (_instance, _handler_id);       \
+      }                                                             \
+  } G_STMT_END                                                      \
+
+#endif
+
 G_END_DECLS