backport [ 1190563 ] os.waitpid docs don't specify return value for WNOHANG

diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 5ac099e97980d831081a43a3511232fb16452b53..338476370a7ff9f8676dcf5a34d26a3b21f6d48f 100644 (file)
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -1657,8 +1657,9 @@ return suitable process handles.
 \end{funcdesc}
 
 \begin{datadesc}{WNOHANG}
-The option for \function{waitpid()} to avoid hanging if no child
-process status is available immediately.
+The option for \function{waitpid()} to return immediately if no child
+process status is available immediately. The function returns
+\code{(0, 0)} in this case.
 Availability: Macintosh, \UNIX.
 \end{datadesc}