document handling of NULL envp as an extension;

from lucas de sena
ok espie

diff --git a/lib/libc/gen/posix_spawn.3 b/lib/libc/gen/posix_spawn.3
index 8ba461d..f56abab 100644 (file)
--- a/lib/libc/gen/posix_spawn.3
+++ b/lib/libc/gen/posix_spawn.3
@@ -1,4 +1,4 @@
-.\"    $OpenBSD: posix_spawn.3,v 1.9 2017/10/17 22:47:58 schwarze Exp $
+.\"    $OpenBSD: posix_spawn.3,v 1.10 2023/06/26 06:58:18 jmc Exp $
 .\"
 .\" Copyright (c) 2012 Marc Espie <espie@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: October 17 2017 $
+.Dd $Mdocdate: June 26 2023 $
 .Dt POSIX_SPAWN 3
 .Os
 .Sh NAME
@@ -122,6 +122,10 @@ with exit status 127.
 .Sh STANDARDS
 Both functions conform to
 .St -p1003.1-2001 .
+.Pp
+The handling of NULL
+.Fa envp
+is an extension to that standard.
 .Sh HISTORY
 These functions were ported from
 .Fx