o add missing getsid() prototype

o fix typo in getsid() that broke getsid(pid) where pid != 0
o cause getsid() and getpgid() to return EPERM if requesting the
  id of a session/process group not in the current session
o check for NULL session in getsid() for exiting processes

2 files changed, 20 insertions, 5 deletions

diff --git a/lib/libc/sys/getpgrp.2 b/lib/libc/sys/getpgrp.2
index 7ad5ef3799b..e278dcd070d 100644
--- a/lib/libc/sys/getpgrp.2
+++ b/lib/libc/sys/getpgrp.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: getpgrp.2,v 1.6 1999/07/04 18:59:43 aaron Exp $
+.\"	$OpenBSD: getpgrp.2,v 1.7 2000/09/12 17:30:45 millert Exp $
 .\"	$NetBSD: getpgrp.2,v 1.8 1995/02/27 12:33:09 cgd Exp $
 .\"
 .\" Copyright (c) 1983, 1991, 1993
@@ -71,6 +71,20 @@ and
 .Fn tcsetpgrp
 calls
 are used to get/set the process group of the control terminal.
+.Sh ERRORS
+.Fn getpgrp
+always succeeds, however
+.Fn getpgid
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er EPERM
+if the current process and the process
+.Fa pid
+are not in the same session.
+.It Bq Er ESRCH
+if there is no process with a process ID equal to
+.Fa pid .
+.El
 .Sh SEE ALSO
 .Xr setpgid 2 ,
 .Xr termios 4
diff --git a/lib/libc/sys/getsid.2 b/lib/libc/sys/getsid.2
index 6d0497876d6..31a66c93e5e 100644
--- a/lib/libc/sys/getsid.2
+++ b/lib/libc/sys/getsid.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: getsid.2,v 1.7 2000/03/01 17:31:23 todd Exp $
+.\"	$OpenBSD: getsid.2,v 1.8 2000/09/12 17:30:45 millert Exp $
 .\"
 .\" Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
 .\"
@@ -56,13 +56,14 @@ to indicate an error.
 .Fn getsid
 will succeed unless:
 .Bl -tag -width Er
+.It Bq Er EPERM
+if the current process and the process
+.Fa pid
+are not in the same session.
 .It Bq Er ESRCH
 if there is no process with a process ID equal to
 .Fa pid .
 .El
-.Pp
-Note that an implementation may restrict this function call to
-processes within the same session ID as the calling process.
 .Sh SEE ALSO
 .Xr getpgid 2 ,
 .Xr getpgrp 2 ,