Merge branch 'tracerpid-abort' into 'main'

gmessages: Check /proc/self/status for TracerPid != 0 before sending SIGTRAP

Closes #3790

See merge request GNOME/glib!4845

glib/gmessages.c

@@ -421,8 +421,30 @@ _g_log_abort (gboolean breakpoint)
 
 #ifdef G_OS_WIN32
   debugger_present = IsDebuggerPresent ();
+#elif defined(G_OS_UNIX)
+  gchar *proc_status = NULL;
+  gsize len;
+
+  /* It's possible for /proc to exist on *BSD as well, so we will
+   * attempt to read the file regardless.
+   */
+  if (g_file_get_contents ("/proc/self/status",
+                           &proc_status,
+                           &len,
+                           NULL))
+    {
+      /* First, check if the line even exists... */
+      if (g_strstr_len (proc_status, len, "TracerPid:"))
+        debugger_present = (g_strstr_len (proc_status, len, "TracerPid:\t0") == NULL);
+      else /* Otherwise, very likely not debugging. */
+        debugger_present = FALSE;
+    }
+  else /* The file likely doesn't exist, so we'll just assume we are debugging. */
+    debugger_present = TRUE;
+
+  g_free (proc_status);
 #else
-  /* Assume GDB is attached. */
+  /* Assume debugger is attached. */
   debugger_present = TRUE;
 #endif /* !G_OS_WIN32 */