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Guido van Rossum  committed 7c3bea0

Clarify that close() of a stream opened by popen() returns None if the
exit status is zero.

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File Doc/lib/libposix.tex

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 argument to the built-in \function{open()} function.  The exit status of
 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.
+object, except that when the exit status is zero (termination without
+errors), \code{None} is returned.
 (Not on MS-DOS.)
 \end{funcdesc}