[gimp] libgimp: add a gimp_fatal_func() allowing stack tracing plug-ins on...

[Jehan Pagès <jehanp src gnome org>]

commit e98b937643b005b9698ee042dc2250a5247fac23
Author: Jehan <jehan girinstud io>
Date:   Wed Apr 4 04:33:19 2018 +0200

    libgimp: add a gimp_fatal_func() allowing stack tracing plug-ins on...
    
    ... various crashes.

 libgimp/gimp.c |   71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 71 insertions(+), 0 deletions(-)
---
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index 789bd70..ac2b455 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -154,6 +154,10 @@ static void       gimp_message_func            (const gchar    *log_domain,
                                                 GLogLevelFlags  log_level,
                                                 const gchar    *message,
                                                 gpointer        data);
+static void       gimp_fatal_func              (const gchar    *log_domain,
+                                                GLogLevelFlags  flags,
+                                                const gchar    *message,
+                                                gpointer        data);
 #ifndef G_OS_WIN32
 static void       gimp_plugin_sigfatal_handler (gint            sig_num);
 #endif
@@ -589,6 +593,17 @@ gimp_main (const GimpPlugInInfo *info,
       fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
       fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
       g_log_set_always_fatal (fatal_mask);
+
+      g_log_set_handler (NULL,
+                         G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL |
+                         G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL,
+                         gimp_fatal_func, NULL);
+    }
+  else
+    {
+      g_log_set_handler (NULL,
+                         G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL,
+                         gimp_fatal_func, NULL);
     }
 
   if (strcmp (argv[ARG_MODE], "-query") == 0)
@@ -1900,6 +1915,62 @@ gimp_message_func (const gchar    *log_domain,
   gimp_message (message);
 }
 
+static void
+gimp_fatal_func (const gchar    *log_domain,
+                 GLogLevelFlags  flags,
+                 const gchar    *message,
+                 gpointer        data)
+{
+  const gchar *level;
+
+  switch (flags & G_LOG_LEVEL_MASK)
+    {
+    case G_LOG_LEVEL_WARNING:
+      level = "WARNING";
+      break;
+    case G_LOG_LEVEL_CRITICAL:
+      level = "CRITICAL";
+      break;
+    case G_LOG_LEVEL_ERROR:
+      level = "ERROR";
+      break;
+    default:
+      level = "FATAL";
+      break;
+    }
+
+  g_printerr ("%s: %s: %s\n",
+              progname, level, message);
+
+  switch (stack_trace_mode)
+    {
+    case GIMP_STACK_TRACE_NEVER:
+      break;
+
+    case GIMP_STACK_TRACE_QUERY:
+        {
+          sigset_t sigset;
+
+          sigemptyset (&sigset);
+          sigprocmask (SIG_SETMASK, &sigset, NULL);
+          gimp_stack_trace_query (progname);
+        }
+      break;
+
+    case GIMP_STACK_TRACE_ALWAYS:
+        {
+          sigset_t sigset;
+
+          sigemptyset (&sigset);
+          sigprocmask (SIG_SETMASK, &sigset, NULL);
+          gimp_stack_trace_print (progname, stdout, NULL);
+        }
+      break;
+    }
+
+  gimp_quit ();
+}
+
 #ifndef G_OS_WIN32
 static void
 gimp_plugin_sigfatal_handler (gint sig_num)