From 1d529f382c4b855d22289990c4369ee68ddd3adc Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 4 Apr 2023 11:29:57 +0900
Subject: [PATCH] PID cache is never cleared where `fork` is not used

---
 process.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/process.c b/process.c
index 4237bbd0f7..daf3456bfd 100644
--- a/process.c
+++ b/process.c
@@ -506,11 +506,13 @@ get_pid(void)
     return PIDT2NUM(cached_pid);
 }
 
+#if defined HAVE_WORKING_FORK || defined HAVE_DAEMON
 static void
 clear_pid_cache(void)
 {
     cached_pid = 0;
 }
+#endif
 
 /*
  *  call-seq: