From 69e041521a80a0b8950f6ec25269a9c3949d6590 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Fri, 5 Dec 2025 15:57:44 +0100
Subject: [PATCH] fsync: Open files in non-blocking mode

This avoids blocking forever when invoked on a fifo.

MFC after:	1 week
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D54084
---
 usr.bin/fsync/fsync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usr.bin/fsync/fsync.c b/usr.bin/fsync/fsync.c
index 9968bc8614a5..f3dbeed3cb77 100644
--- a/usr.bin/fsync/fsync.c
+++ b/usr.bin/fsync/fsync.c
@@ -49,7 +49,7 @@ main(int argc, char *argv[])
 	
 	rval = EX_OK;
 	for (i = 1; i < argc; ++i) {
-		if ((fd = open(argv[i], O_RDONLY)) == -1) {
+		if ((fd = open(argv[i], O_RDONLY | O_NONBLOCK)) == -1) {
 			warn("open %s", argv[i]);
 			if (rval == EX_OK)
 				rval = EX_NOINPUT;