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-rw-r--r--lib/libc/sys/getsockopt.213
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2
index 87531d9bc1a..db624e4ace7 100644
--- a/lib/libc/sys/getsockopt.2
+++ b/lib/libc/sys/getsockopt.2
@@ -1,4 +1,4 @@
-.\" $NetBSD: getsockopt.2,v 1.39 2018/11/05 09:18:55 wiz Exp $
+.\" $NetBSD: getsockopt.2,v 1.40 2019/05/08 14:10:42 christos Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@@ -29,7 +29,7 @@
.\"
.\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95
.\"
-.Dd November 3, 2018
+.Dd May 8, 2019
.Dt GETSOCKOPT 2
.Os
.Sh NAME
@@ -104,6 +104,15 @@ size of the buffer pointed to by
.Fa optval ,
and modified on return to indicate the actual size of
the value returned.
+If the size of the requested option value to be stored in
+.Fa optval
+is greater than the size indicated in
+.Fa optlen
+then only
+.Fa optlen
+bytes will be stored in
+.Fa optval
+and the result will be silently truncated.
If no option value is to be supplied or returned,
.Fa optval
may be