diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index b8d860e..7a1fa3b 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -160,6 +160,9 @@ static bool RecoveryConflictPending = false;
 static bool RecoveryConflictRetryable = true;
 static ProcSignalReason RecoveryConflictReason;
 
+/* Hook for plugins to get control at start of session */
+session_start_hook_type session_start_hook = NULL;
+
 /* ----------------------------------------------------------------
  *		decls for routines only used in this file
  * ----------------------------------------------------------------
@@ -3808,6 +3811,9 @@ PostgresMain(int argc, char *argv[],
 	if (!IsUnderPostmaster)
 		PgStartTime = GetCurrentTimestamp();
 
+	if (session_start_hook)
+		(*session_start_hook) (dbname, username);
+
 	/*
 	 * POSTGRES main processing loop begins here
 	 *
diff --git a/src/include/tcop/tcopprot.h b/src/include/tcop/tcopprot.h
index f8c535c..d349592 100644
--- a/src/include/tcop/tcopprot.h
+++ b/src/include/tcop/tcopprot.h
@@ -35,6 +35,11 @@ extern PGDLLIMPORT const char *debug_query_string;
 extern int	max_stack_depth;
 extern int	PostAuthDelay;
 
+/* Hook for plugins to get control at start of session */
+typedef void (*session_start_hook_type) (const char *dbname,
+										 const char *username);
+extern PGDLLIMPORT session_start_hook_type session_start_hook;
+
 /* GUC-configurable parameters */
 
 typedef enum