Add a bunch of index entries related to retrieving information from
the process table.
diff --git a/Doc/lib/libposix.tex b/Doc/lib/libposix.tex
index 0071bf1..27f8197 100644
--- a/Doc/lib/libposix.tex
+++ b/Doc/lib/libposix.tex
@@ -180,26 +180,32 @@
\end{funcdesc}
\begin{funcdesc}{getpgrp}{}
+\index{process!group}
Return the current process group id.
(Not on MS-DOS.)
\end{funcdesc}
\begin{funcdesc}{getpid}{}
+\index{process!id}
Return the current process id.
(Not on MS-DOS.)
\end{funcdesc}
\begin{funcdesc}{getppid}{}
+\index{process!id of parent}
Return the parent's process id.
(Not on MS-DOS.)
\end{funcdesc}
\begin{funcdesc}{getuid}{}
+\index{user id}
Return the current process' user id.
(Not on MS-DOS.)
\end{funcdesc}
\begin{funcdesc}{kill}{pid, sig}
+\index{process!killing}
+\index{process!signalling}
Kill the process \var{pid} with signal \var{sig}.
(Not on MS-DOS.)
\end{funcdesc}