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diff --git a/lib/libc/sys/cpuset.2 b/lib/libc/sys/cpuset.2
--- a/lib/libc/sys/cpuset.2
+++ b/lib/libc/sys/cpuset.2
@@ -1,5 +1,6 @@
.\" Copyright (c) 2008 Christian Brueffer
.\" Copyright (c) 2008 Jeffrey Roberson
+.\" Copyright (c) 2021 Robert N. M. Watson
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
@@ -180,9 +181,72 @@
.Xr cpuset_setaffinity 2 ,
.Xr cpuset_getdomain 2 , and
.Xr cpuset_setdomain 2 .
+The
+.Xr cpuset 9
+macros may be used to manipulate masks of type
+.Ft cpuset_t
+get and set using those APIs.
See those manual pages for more detail.
.Sh RETURN VALUES
.Rv -std
+.Sh EXAMPLES
+In this example, a CPU set mask is configured to limit execution to the first
+CPU using
+.Xr CPU_ZERO 9
+and
+.Xr CPU_SET 9 ,
+members of the
+.Xr cpuset 9
+programming interface.
+Then, the mask is applied to a new anonymous CPU set associated with the
+current process using
+.Xr cpuset_setaffinity 2 .
+This mask will be used by the current process, and inherited by any new
+child processes.
+.Bd -literal -offset indent
+#include <sys/param.h>
+#include <sys/cpuset.h>
+
+#include <sysexits.h>
+
+cpuset_t cpuset_mask;
+
+/* Initialize a CPU mask and enable CPU 0. */
+CPU_ZERO(&cpuset_mask);
+CPU_SET(0, &cpuset_mask);
+
+/* Set affinity for the CPU set for the current process. */
+if (cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
+ sizeof(cpuset_mask), &cpuset_mask) < 0)
+ err(EX_OSERR, "cpuset_setaffinity");
+.Ed
+.Pp
+In the next example, a named CPU set is created containing the current
+process, and its affinity similarly configured.
+The resulting CPU set ID can then be used for further external management of
+the affinity of the set.
+.Bd -literal -offset indent
+#include <sys/param.h>
+#include <sys/cpuset.h>
+
+#include <sysexits.h>
+
+cpusetid_t cpuset_id;
+cpuset_t cpuset_mask;
+
+/* Create new cpuset for the current process. */
+if (cpuset(&cpuset_id) < 0)
+ err(EX_OSERR, "cpuset");
+
+/* Initialize a CPU mask and enable CPU 0. */
+CPU_ZERO(&cpuset_mask);
+CPU_SET(0, &cpuset_mask);
+
+/* Set affinity for the CPU set for the current process. */
+if (cpuset_setaffinity(CPU_LEVEL_SET, CPU_WHICH_CPUSET, cpuset_id,
+ sizeof(cpuset_mask), &cpuset_mask) < 0)
+ err(EX_OSERR, "cpuset_setaffinity");
+.Ed
.Sh ERRORS
The following error codes may be set in
.Va errno :
@@ -226,6 +290,8 @@
.Xr cpuset_setdomain 2 ,
.Xr pthread_affinity_np 3 ,
.Xr pthread_attr_affinity_np 3 ,
+.Xr CPU_SET 9 ,
+.Xr CPU_ZERO 9 ,
.Xr cpuset 9
.Sh HISTORY
The

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