From 2c4573afe55e83d3b5c99460c7429ff7cf3adcdf Mon Sep 17 00:00:00 2001
From: Tristan Partin <tristan@neon.tech>
Date: Thu, 6 Jul 2023 15:25:14 -0500
Subject: [PATCH v1 1/2] Use signal-safe functions in signal handler

According to signal-safety(7), exit(3) and puts(3) are not safe to call
in a signal handler.
---
 src/bin/pg_test_fsync/pg_test_fsync.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/bin/pg_test_fsync/pg_test_fsync.c b/src/bin/pg_test_fsync/pg_test_fsync.c
index 435df8d808..2fc4b69444 100644
--- a/src/bin/pg_test_fsync/pg_test_fsync.c
+++ b/src/bin/pg_test_fsync/pg_test_fsync.c
@@ -596,8 +596,8 @@ signal_cleanup(SIGNAL_ARGS)
 	if (needs_unlink)
 		unlink(filename);
 	/* Finish incomplete line on stdout */
-	puts("");
-	exit(1);
+	write(STDOUT_FILENO, "", 1);
+	_exit(1);
 }
 
 #ifdef HAVE_FSYNC_WRITETHROUGH
-- 
Tristan Partin
Neon (https://neon.tech)