add history for getpid(2) and getppid(2)

getpid() appeared (undocumented) in v5.  Between v6 and v7 there is an
extra return value for the parent process ID.

getppid() did not appear in v7, it appeared in 32v libc.  But getppid()
predates 32v.  It seems to have been in earlier USG releases such as
Generic 3 (PG-1C300 Issue 3) as the MERT Release 0 manual references it.

getppid() didn't become a system call until 4.3BSD-Reno

omit most of these details and just mention v5 and 32v

with and ok schwarze@

diff --git a/lib/libc/sys/getpid.2 b/lib/libc/sys/getpid.2
index 90f76fc..3207348 100644 (file)
--- a/lib/libc/sys/getpid.2
+++ b/lib/libc/sys/getpid.2
@@ -1,4 +1,4 @@
-.\"    $OpenBSD: getpid.2,v 1.13 2015/09/10 17:55:21 schwarze Exp $
+.\"    $OpenBSD: getpid.2,v 1.14 2022/12/30 23:12:12 jsg Exp $
 .\"    $NetBSD: getpid.2,v 1.5 1995/02/27 12:33:12 cgd Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)getpid.2   8.1 (Berkeley) 6/4/93
 .\"
-.Dd $Mdocdate: September 10 2015 $
+.Dd $Mdocdate: December 30 2022 $
 .Dt GETPID 2
 .Os
 .Sh NAME
@@ -65,3 +65,12 @@ and
 .Fn getppid
 conform to
 .St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn getpid
+system call first appeared in
+.At v5 .
+The
+.Fn getppid
+function appeared in
+.At 32v .