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Index: head/lib/libc/gen/getpeereid.c
===================================================================
--- head/lib/libc/gen/getpeereid.c
+++ head/lib/libc/gen/getpeereid.c
@@ -47,7 +47,7 @@
int error;
xuclen = sizeof(xuc);
- error = _getsockopt(s, 0, LOCAL_PEERCRED, &xuc, &xuclen);
+ error = _getsockopt(s, SOL_LOCAL, LOCAL_PEERCRED, &xuc, &xuclen);
if (error != 0)
return (error);
if (xuc.cr_version != XUCRED_VERSION) {
Index: head/share/man/man4/unix.4
===================================================================
--- head/share/man/man4/unix.4
+++ head/share/man/man4/unix.4
@@ -28,7 +28,7 @@
.\" @(#)unix.4 8.1 (Berkeley) 6/9/93
.\" $FreeBSD$
.\"
-.Dd August 19, 2018
+.Dd August 3, 2020
.Dt UNIX 4
.Os
.Sh NAME
@@ -195,7 +195,9 @@
reused for a new process.
.Sh SOCKET OPTIONS
.Tn UNIX
-domain sockets support a number of socket options which can be set with
+domain sockets support a number of socket options for the options level
+.Dv SOL_LOCAL ,
+which can be set with
.Xr setsockopt 2
and tested with
.Xr getsockopt 2 :
Index: head/sys/kern/uipc_usrreq.c
===================================================================
--- head/sys/kern/uipc_usrreq.c
+++ head/sys/kern/uipc_usrreq.c
@@ -1470,7 +1470,7 @@
struct xucred xu;
int error, optval;
- if (sopt->sopt_level != 0)
+ if (sopt->sopt_level != SOL_LOCAL)
return (EINVAL);
unp = sotounpcb(so);
Index: head/sys/sys/un.h
===================================================================
--- head/sys/sys/un.h
+++ head/sys/sys/un.h
@@ -62,6 +62,8 @@
#if __BSD_VISIBLE
+#define SOL_LOCAL 0 /* Options for local socket */
+
/* Socket options. */
#define LOCAL_PEERCRED 1 /* retrieve peer credentials */
#define LOCAL_CREDS 2 /* pass credentials to receiver */

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