Expose setgroups. Fixes feature request #468116.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 8adcbd5..70552c4 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -204,6 +204,13 @@
Availability: \UNIX{}.
\end{funcdesc}
+\begin{funcdesc}{setgroups}{groups}
+Set list of supplemental group ids associated with the current
+process to \var{groups}.
+Availability: \UNIX{}.
+\versionadded{2.2}
+\end{funcdesc}
+
\begin{funcdesc}{setpgrp}{}
Calls the system call \cfunction{setpgrp()} or \cfunction{setpgrp(0,
0)} depending on which version is implemented (if any). See the