From 4ff782c06a56281b113df6dbf48bb397ddcb020a Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Thu, 10 Aug 2023 14:56:53 +0000
Subject: [PATCH] tcopy: Pick up max blocksize from sysctl kern.maxphys

---
 usr.bin/tcopy/tcopy.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/usr.bin/tcopy/tcopy.c b/usr.bin/tcopy/tcopy.c
index 24dcc969a9af..ef0da430002e 100644
--- a/usr.bin/tcopy/tcopy.c
+++ b/usr.bin/tcopy/tcopy.c
@@ -52,6 +52,7 @@ static const char sccsid[] = "@(#)tcopy.c	8.2 (Berkeley) 4/17/94";
 #include <errno.h>
 #include <fcntl.h>
 #include <paths.h>
+#include <sys/sysctl.h>
 #include <signal.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -82,6 +83,11 @@ main(int argc, char *argv[])
 	int ch, needeof;
 	char *buff;
 	const char *inf;
+	unsigned long maxphys = 0;
+	size_t l_maxphys = sizeof maxphys;
+
+	if (!sysctlbyname("kern.maxphys", &maxphys, &l_maxphys, NULL, 0))
+		maxblk = maxphys;
 
 	msg = stdout;
 	guesslen = 1;