From 24b741db5fc907d35e51c97f8ef8ad595474e6b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Fri, 8 Sep 2023 18:17:41 +0000
Subject: [PATCH] grep: Suppress EISDIR when reading.

MFC after:	1 week
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
Reviewed by:	kevans

(cherry picked from commit caf5283fc92edb83173752b1dafbc6d586e78815)
---
 usr.bin/grep/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/usr.bin/grep/file.c b/usr.bin/grep/file.c
index cd276481177..3349b72842c 100644
--- a/usr.bin/grep/file.c
+++ b/usr.bin/grep/file.c
@@ -72,6 +72,8 @@ grep_refill(struct file *f)
 	bufrem = 0;
 
 	nr = read(f->fd, buffer, MAXBUFSIZ);
+	if (nr < 0 && errno == EISDIR)
+		nr = 0;
 	if (nr < 0)
 		return (-1);