Add chroot call. Implements feature #459267.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 85355a5..f8804e8 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -577,6 +577,12 @@
Availability: Macintosh, \UNIX{}, Windows.
\end{funcdesc}
+\begin{funcdesc}{chroot}{path}
+Change the root directory of the current process to \var{path}.
+Availability: \UNIX{}.
+\versionadded{2.2}
+\end{funcdesc}
+
\begin{funcdesc}{chmod}{path, mode}
Change the mode of \var{path} to the numeric \var{mode}.
Availability: \UNIX{}, Windows.