Be clear that RUSAGE_CHILDREN only works for terminated children that have

been waited for. If you SIG_IGN SIGCHLD or don't call any of the wait
functions then RUSAGE_CHILDREN wont report anything.
OK deraadt@ millert@

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/libc/sys/getrusage.2 b/lib/libc/sys/getrusage.2
index aeaf5c9d124..35eccf70b98 100644
--- a/lib/libc/sys/getrusage.2
+++ b/lib/libc/sys/getrusage.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: getrusage.2,v 1.17 2015/02/28 21:51:57 bentley Exp $
+.\"	$OpenBSD: getrusage.2,v 1.18 2024/07/17 13:29:05 claudio Exp $
 .\"
 .\" Copyright (c) 1985, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)getrusage.2	8.1 (Berkeley) 6/4/93
 .\"
-.Dd $Mdocdate: February 28 2015 $
+.Dd $Mdocdate: July 17 2024 $
 .Dt GETRUSAGE 2
 .Os
 .Sh NAME
@@ -48,7 +48,10 @@ which can be one of the following:
 .It Dv RUSAGE_SELF
 Resources used by the current process.
 .It Dv RUSAGE_CHILDREN
-Resources used by all the terminated children of the current process.
+Resources used by all the terminated children of the current process which
+were waited upon.
+If the child is never waited for, the resource information for the child
+process is discarded.
 .It Dv RUSAGE_THREAD
 Resources used by the current thread.
 .El
@@ -186,4 +189,4 @@ flag has been available since
 .Ox 4.8 .
 .Sh BUGS
 There is no way to obtain information about a child process
-that has not yet terminated.
+that has not yet terminated or has not been waited for by the parent.