MINOR: debug: add a new DEBUG_FD build option
When DEBUG_FD is set at build time, we'll keep a counter of per-FD events
in the fdtab. This counter is reported in "show fd" even for closed FDs if
not zero. The purpose is to help spot situations where an apparently closed
FD continues to be reported in loops, or where some events are dismissed.
diff --git a/Makefile b/Makefile
index 9d8d350..d779009 100644
--- a/Makefile
+++ b/Makefile
@@ -213,7 +213,8 @@
# You can enable debugging on specific code parts by setting DEBUG=-DDEBUG_xxx.
# Currently defined DEBUG macros include DEBUG_FULL, DEBUG_MEMORY, DEBUG_FSM,
# DEBUG_HASH, DEBUG_AUTH, DEBUG_SPOE, DEBUG_UAF and DEBUG_THREAD, DEBUG_STRICT,
-# DEBUG_DEV. Please check sources for exact meaning or do not use at all.
+# DEBUG_DEV, DEBUG_FD. Please check sources for exact meaning or do not use at
+# all.
DEBUG =
#### Trace options