Merged changes from the 1.5.2p2 release.
(Very rough.)
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 5239fcb..4001447 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -262,7 +262,9 @@
the command (encoded in the format specified for \function{wait()}) is
available as the return value of the \method{close()} method of the file
object, except that when the exit status is zero (termination without
-errors), \code{None} is returned.
+errors), \code{None} is returned. \strong{Note:} This function
+behaves unreliably under Windows due to the native implementation of
+\cfunction{popen()}.
Availability: \UNIX{}, Windows.
\end{funcdesc}
@@ -443,12 +445,35 @@
\subsection{Files and Directories \label{os-file-dir}}
\begin{funcdesc}{access}{path, mode}
-Check read/write/execute permissions for this process or extance of file
-\var{path}. Return \code{1} if access is granted, \code{0} if not.
-See the \UNIX{} manual for the semantics.
+Check read/write/execute permissions for this process or existence of
+file \var{path}. \var{mode} should be \constant{F_OK} to test the
+existence of \var{path}, or it can be the inclusive OR of one or more
+of \constant{R_OK}, \constant{W_OK}, and \constant{X_OK} to test
+permissions. Return \code{1} if access is allowed, \code{0} if not.
+See the \UNIX{} man page \manpage{access}{2} for more information.
Availability: \UNIX{}.
\end{funcdesc}
+\begin{datadesc}{F_OK}
+ Value to pass as the \var{mode} parameter of \function{access()} to
+ test the existence of \var{path}.
+\end{datadesc}
+
+\begin{datadesc}{R_OK}
+ Value to include in the \var{mode} parameter of \function{access()}
+ to test the readability of \var{path}.
+\end{datadesc}
+
+\begin{datadesc}{W_OK}
+ Value to include in the \var{mode} parameter of \function{access()}
+ to test the writability of \var{path}.
+\end{datadesc}
+
+\begin{datadesc}{X_OK}
+ Value to include in the \var{mode} parameter of \function{access()}
+ to determine if \var{path} can be executed.
+\end{datadesc}
+
\begin{funcdesc}{chdir}{path}
\index{directory!changing}
Change the current working directory to \var{path}.
@@ -877,9 +902,10 @@
Availability: \UNIX{}.
\end{datadesc}
-The following functions take a process stats code as returned by
-\function{waitpid()} as a parameter. They may be used to determine
-the disposition of a process.
+The following functions take a process status code as returned by
+\function{system()}, \function{wait()}, or \function{waitpid()} as a
+parameter. They may be used to determine the disposition of a
+process.
\begin{funcdesc}{WIFSTOPPED}{status}
Return true if the process has been stopped.