From aae81fb4cef299b058f636e769fa3f28bdd05c82 Mon Sep 17 00:00:00 2001
From: Keith Bostic <bostic@ucbvax.Berkeley.EDU>
Date: Thu, 14 May 1992 22:41:27 -0800
Subject: [PATCH] add munmap call

SCCS-vsn: usr.bin/tail/forward.c 5.6
---
 usr/src/usr.bin/tail/forward.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/usr/src/usr.bin/tail/forward.c b/usr/src/usr.bin/tail/forward.c
index 2c38703677..8370ecd8e0 100644
--- a/usr/src/usr.bin/tail/forward.c
+++ b/usr/src/usr.bin/tail/forward.c
@@ -169,18 +169,19 @@ rlines(fp, off, sbp)
 {
 	register off_t size;
 	register char *p;
+	char *start;
 
 	if (!(size = sbp->st_size))
 		return;
 
-	if ((p = mmap(NULL,
+	if ((start = mmap(NULL,
 	    size, PROT_READ, MAP_FILE, fileno(fp), (off_t)0)) == (caddr_t)-1) {
 		err(0, "%s", strerror(errno));
 		return;
 	}
 
 	/* Last char is special, ignore whether newline or not. */
-	for (p += size - 1; --size;)
+	for (p = start + size - 1; --size;)
 		if (*--p == '\n' && !--off) {
 			++p;
 			break;
@@ -193,4 +194,8 @@ rlines(fp, off, sbp)
 		ierr();
 		return;
 	}
+	if (munmap(start, size)) {
+		err(0, "%s", strerror(errno));
+		return;
+	}
 }
-- 
2.20.1